re PR fortran/29383 (Fortran 2003/F95[TR15580:1999]: Floating point exception (IEEE) support)

PR fortran/29383

gcc/fortran/
	* gfortran.h (gfc_simplify_ieee_selected_real_kind): New prototype.
	* libgfortran.h (GFC_FPE_*): Use simple integer values, valid in
	both C and Fortran.
	* expr.c (gfc_check_init_expr): Simplify IEEE_SELECTED_REAL_KIND.
	* simplify.c (gfc_simplify_ieee_selected_real_kind): New function.
	* module.c (mio_symbol): Keep track of symbols which came from
	intrinsic modules.
	(gfc_use_module): Keep track of the IEEE modules.
	* trans-decl.c (gfc_get_symbol_decl): Adjust code since
	we have new intrinsic modules.
	(gfc_build_builtin_function_decls): Build decls for
	ieee_procedure_entry and ieee_procedure_exit.
	(is_from_ieee_module, is_ieee_module_used, save_fp_state,
	restore_fp_state): New functions.
	(gfc_generate_function_code): Save and restore floating-point
	state on procedure entry/exit, when IEEE modules are used.
	* intrinsic.texi: Document the IEEE modules.

libgfortran/
	* configure.host: Add checks for IEEE support, rework priorities.
	* configure.ac: Define IEEE_SUPPORT, check for fpsetsticky and
	fpresetsticky.
	* configure: Regenerate.
	* Makefile.am: Build new ieee files, install IEEE_* modules.
	* Makefile.in: Regenerate.
	* gfortran.map (GFORTRAN_1.6): Add new symbols.
	* libgfortran.h (get_fpu_trap_exceptions, set_fpu_trap_exceptions,
	support_fpu_trap, set_fpu_except_flags, support_fpu_flag,
	support_fpu_rounding_mode, get_fpu_state, set_fpu_state): New
	prototypes.
	* config/fpu-*.h (get_fpu_trap_exceptions,
	set_fpu_trap_exceptions, support_fpu_trap, set_fpu_except_flags,
	support_fpu_flag, support_fpu_rounding_mode, get_fpu_state,
	set_fpu_state): New functions.
	* ieee/ieee_features.F90: New file.
	* ieee/ieee_exceptions.F90: New file.
	* ieee/ieee_arithmetic.F90: New file.
	* ieee/ieee_helper.c: New file.

gcc/testsuite/
	* lib/target-supports.exp (check_effective_target_fortran_ieee): 
	New function.
	* gfortran.dg/ieee/ieee.exp: New file.
	* gfortran.dg/ieee/ieee_1.F90: New file.
	* gfortran.dg/ieee/ieee_2.f90: New file.
	* gfortran.dg/ieee/ieee_3.f90: New file.
	* gfortran.dg/ieee/ieee_4.f90: New file.
	* gfortran.dg/ieee/ieee_5.f90: New file.
	* gfortran.dg/ieee/ieee_6.f90: New file.
	* gfortran.dg/ieee/ieee_7.f90: New file.
	* gfortran.dg/ieee/ieee_rounding_1.f90: New file.

From-SVN: r212102

gcc/fortran/ChangeLog

@@ -1,3 +1,24 @@
+2014-06-28  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
+
+	PR fortran/29383
+	* gfortran.h (gfc_simplify_ieee_selected_real_kind): New prototype.
+	* libgfortran.h (GFC_FPE_*): Use simple integer values, valid in
+	both C and Fortran.
+	* expr.c (gfc_check_init_expr): Simplify IEEE_SELECTED_REAL_KIND.
+	* simplify.c (gfc_simplify_ieee_selected_real_kind): New function.
+	* module.c (mio_symbol): Keep track of symbols which came from
+	intrinsic modules.
+	(gfc_use_module): Keep track of the IEEE modules.
+	* trans-decl.c (gfc_get_symbol_decl): Adjust code since
+	we have new intrinsic modules.
+	(gfc_build_builtin_function_decls): Build decls for
+	ieee_procedure_entry and ieee_procedure_exit.
+	(is_from_ieee_module, is_ieee_module_used, save_fp_state,
+	restore_fp_state): New functions.
+	(gfc_generate_function_code): Save and restore floating-point
+	state on procedure entry/exit, when IEEE modules are used.
+	* intrinsic.texi: Document the IEEE modules.
+
 2014-06-25  Tobias Burnus  <burnus@net-b.de>
 
 	* interface.c (check_intents): Fix diagnostic with

gcc/fortran/expr.c

@@ -2460,9 +2460,23 @@ gfc_check_init_expr (gfc_expr *e)
 
       {
 	gfc_intrinsic_sym* isym;
-	gfc_symbol* sym;
+	gfc_symbol* sym = e->symtree->n.sym;
+
+	/* Special case for IEEE_SELECTED_REAL_KIND from the intrinsic
+	   module IEEE_ARITHMETIC, which is allowed in initialization
+	   expressions.  */
+	if (!strcmp(sym->name, "ieee_selected_real_kind")
+	    && sym->from_intmod == INTMOD_IEEE_ARITHMETIC)
+	  {
+	    gfc_expr *new_expr = gfc_simplify_ieee_selected_real_kind (e);
+	    if (new_expr)
+	      {
+		gfc_replace_expr (e, new_expr);
+		t = true;
+		break;
+	      }
+	  }
 
-	sym = e->symtree->n.sym;
 	if (!gfc_is_intrinsic (sym, 0, e->where)
 	    || (m = gfc_intrinsic_func_interface (e, 0)) != MATCH_YES)
 	  {

gcc/fortran/gfortran.h

@@ -678,7 +678,8 @@ iso_c_binding_symbol;
 
 typedef enum
 {
-  INTMOD_NONE = 0, INTMOD_ISO_FORTRAN_ENV, INTMOD_ISO_C_BINDING
+  INTMOD_NONE = 0, INTMOD_ISO_FORTRAN_ENV, INTMOD_ISO_C_BINDING,
+  INTMOD_IEEE_FEATURES, INTMOD_IEEE_EXCEPTIONS, INTMOD_IEEE_ARITHMETIC
 }
 intmod_id;
 
@@ -2870,6 +2871,8 @@ gfc_formal_arglist *gfc_sym_get_dummy_args (gfc_symbol *);
 /* intrinsic.c -- true if working in an init-expr, false otherwise.  */
 extern bool gfc_init_expr_flag;
 
+gfc_expr *gfc_simplify_ieee_selected_real_kind (gfc_expr *);
+
 /* Given a symbol that we have decided is intrinsic, mark it as such
    by placing it into a special module that is otherwise impossible to
    read or write.  */

gcc/fortran/intrinsic.texi

@@ -13155,6 +13155,7 @@ Fortran 95 elemental function: @ref{IEOR}
 @menu
 * ISO_FORTRAN_ENV::
 * ISO_C_BINDING::
+* IEEE modules::
 * OpenMP Modules OMP_LIB and OMP_LIB_KINDS::
 @end menu
 
@@ -13366,6 +13367,35 @@ Moreover, the following two named constants are defined:
 
 Both are equivalent to the value @code{NULL} in C.
 
+
+
+@node IEEE modules
+@section IEEE modules: @code{IEEE_EXCEPTIONS}, @code{IEEE_ARITHMETIC}, and @code{IEEE_FEATURES}
+@table @asis
+@item @emph{Standard}:
+Fortran 2003 and later
+@end table
+
+The @code{IEEE_EXCEPTIONS}, @code{IEEE_ARITHMETIC}, and @code{IEEE_FEATURES}
+intrinsic modules provide support for exceptions and IEEE arithmetic, as
+defined in Fortran 2003 and later standards, and the IEC 60559:1989 standard
+(@emph{Binary floating-point arithmetic for microprocessor systems}). These
+modules are only provided on the following supported platforms:
+
+@itemize @bullet
+@item i386 and x86_64 processors
+@item platforms which use the GNU C Library (glibc)
+@item platforms with support for SysV/386 routines for floating point
+interface (including Solaris and BSDs)
+@item platforms with the AIX OS
+@end itemize
+
+For full compliance with the Fortran standards, code using the
+@code{IEEE_EXCEPTIONS} or @code{IEEE_ARITHMETIC} modules should be compiled
+with the following options: @code{-fno-unsafe-math-optimizations
+-frounding-math -fsignaling-nans}.
+
+
 @node OpenMP Modules OMP_LIB and OMP_LIB_KINDS
 @section OpenMP Modules @code{OMP_LIB} and @code{OMP_LIB_KINDS}
 @table @asis

gcc/fortran/libgfortran.h

@@ -35,13 +35,14 @@ along with GCC; see the file COPYING3.  If not see
 					   obsolescent in later standards.  */
 
 
-/* Bitmasks for the various FPE that can be enabled.  */
+/* Bitmasks for the various FPE that can be enabled.  These need to be straight integers
-#define GFC_FPE_INVALID    (1<<0)
+   e.g., 8 instead of (1<<3), because they will be included in Fortran source.  */
-#define GFC_FPE_DENORMAL   (1<<1)
+#define GFC_FPE_INVALID      1
-#define GFC_FPE_ZERO       (1<<2)
+#define GFC_FPE_DENORMAL     2
-#define GFC_FPE_OVERFLOW   (1<<3)
+#define GFC_FPE_ZERO         4
-#define GFC_FPE_UNDERFLOW  (1<<4)
+#define GFC_FPE_OVERFLOW     8
-#define GFC_FPE_INEXACT    (1<<5)
+#define GFC_FPE_UNDERFLOW   16
+#define GFC_FPE_INEXACT     32
 
 /* Defines for floating-point rounding modes.  */
 #define GFC_FPE_DOWNWARD   1
@@ -49,6 +50,10 @@ along with GCC; see the file COPYING3.  If not see
 #define GFC_FPE_TOWARDZERO 3
 #define GFC_FPE_UPWARD     4
 
+/* Size of the buffer required to store FPU state for any target.
+   In particular, this has to be larger than fenv_t on all glibc targets.
+   Currently, the winner is x86_64 with 32 bytes.  */
+#define GFC_FPE_STATE_BUFFER_SIZE 32
 
 /* Bitmasks for the various runtime checks that can be enabled.  */
 #define GFC_RTCHECK_BOUNDS      (1<<0)

gcc/fortran/module.c

@@ -190,6 +190,9 @@ static gzFile module_fp;
 static const char *module_name;
 static gfc_use_list *module_list;
 
+/* If we're reading an intrinsic module, this is its ID.  */
+static intmod_id current_intmod;
+
 /* Content of module.  */
 static char* module_content;
 
@@ -4096,6 +4099,9 @@ mio_symbol (gfc_symbol *sym)
   else
     {
       mio_integer (&intmod);
+      if (current_intmod)
+	sym->from_intmod = current_intmod;
+      else
 	sym->from_intmod = (intmod_id) intmod;
     }
   
@@ -6733,6 +6739,7 @@ gfc_use_module (gfc_use_list *module)
   module_name = module->module_name;
   gfc_rename_list = module->rename;
   only_flag = module->only_flag;
+  current_intmod = INTMOD_NONE;
 
   filename = XALLOCAVEC (char, strlen (module_name) + strlen (MODULE_EXTENSION)
 			       + 1);
@@ -6777,6 +6784,26 @@ gfc_use_module (gfc_use_list *module)
       if (module_fp == NULL && module->intrinsic)
 	gfc_fatal_error ("Can't find an intrinsic module named '%s' at %C",
 			 module_name);
+
+      /* Check for the IEEE modules, so we can mark their symbols
+	 accordingly when we read them.  */
+      if (strcmp (module_name, "ieee_features") == 0
+	  && gfc_notify_std (GFC_STD_F2003, "IEEE_FEATURES module at %C"))
+	{
+	  current_intmod = INTMOD_IEEE_FEATURES;
+	}
+      else if (strcmp (module_name, "ieee_exceptions") == 0
+	       && gfc_notify_std (GFC_STD_F2003,
+				  "IEEE_EXCEPTIONS module at %C"))
+	{
+	  current_intmod = INTMOD_IEEE_EXCEPTIONS;
+	}
+      else if (strcmp (module_name, "ieee_arithmetic") == 0
+	       && gfc_notify_std (GFC_STD_F2003,
+				  "IEEE_ARITHMETIC module at %C"))
+	{
+	  current_intmod = INTMOD_IEEE_ARITHMETIC;
+	}
     }
 
   if (module_fp == NULL)

gcc/fortran/simplify.c

@@ -5460,12 +5460,13 @@ gfc_simplify_selected_real_kind (gfc_expr *p, gfc_expr *q, gfc_expr *rdx)
       if (gfc_real_kinds[i].range >= range)
 	found_range = 1;
 
-      if (gfc_real_kinds[i].radix >= radix)
+      if (radix == 0 || gfc_real_kinds[i].radix == radix)
 	found_radix = 1;
 
       if (gfc_real_kinds[i].precision >= precision
 	  && gfc_real_kinds[i].range >= range
-	  && gfc_real_kinds[i].radix >= radix && gfc_real_kinds[i].kind < kind)
+	  && (radix == 0 || gfc_real_kinds[i].radix == radix)
+	  && gfc_real_kinds[i].kind < kind)
 	kind = gfc_real_kinds[i].kind;
     }
 
@@ -5487,6 +5488,87 @@ gfc_simplify_selected_real_kind (gfc_expr *p, gfc_expr *q, gfc_expr *rdx)
 }
 
 
+gfc_expr *
+gfc_simplify_ieee_selected_real_kind (gfc_expr *expr)
+{
+  gfc_actual_arglist *arg = expr->value.function.actual;
+  gfc_expr *p = arg->expr, *r = arg->next->expr,
+	   *rad = arg->next->next->expr;
+  int precision, range, radix, res;
+  int found_precision, found_range, found_radix, i;
+
+  if (p)
+  {
+    if (p->expr_type != EXPR_CONSTANT
+	|| gfc_extract_int (p, &precision) != NULL)
+      return NULL;
+  }
+  else
+    precision = 0;
+
+  if (r)
+  {
+    if (r->expr_type != EXPR_CONSTANT
+	|| gfc_extract_int (r, &range) != NULL)
+      return NULL;
+  }
+  else
+    range = 0;
+
+  if (rad)
+  {
+    if (rad->expr_type != EXPR_CONSTANT
+	|| gfc_extract_int (rad, &radix) != NULL)
+      return NULL;
+  }
+  else
+    radix = 0;
+
+  res = INT_MAX;
+  found_precision = 0;
+  found_range = 0;
+  found_radix = 0;
+
+  for (i = 0; gfc_real_kinds[i].kind != 0; i++)
+    {
+      /* We only support the target's float and double types.  */
+      if (!gfc_real_kinds[i].c_float && !gfc_real_kinds[i].c_double)
+	continue;
+
+      if (gfc_real_kinds[i].precision >= precision)
+	found_precision = 1;
+
+      if (gfc_real_kinds[i].range >= range)
+	found_range = 1;
+
+      if (radix == 0 || gfc_real_kinds[i].radix == radix)
+	found_radix = 1;
+
+      if (gfc_real_kinds[i].precision >= precision
+	  && gfc_real_kinds[i].range >= range
+	  && (radix == 0 || gfc_real_kinds[i].radix == radix)
+	  && gfc_real_kinds[i].kind < res)
+	res = gfc_real_kinds[i].kind;
+    }
+
+  if (res == INT_MAX)
+    {
+      if (found_radix && found_range && !found_precision)
+	res = -1;
+      else if (found_radix && found_precision && !found_range)
+	res = -2;
+      else if (found_radix && !found_precision && !found_range)
+	res = -3;
+      else if (found_radix)
+	res = -4;
+      else
+	res = -5;
+    }
+
+  return gfc_get_int_expr (gfc_default_integer_kind, &expr->where, res);
+}
+
+
 gfc_expr *
 gfc_simplify_set_exponent (gfc_expr *x, gfc_expr *i)
 {

gcc/fortran/trans-decl.c

@@ -90,6 +90,9 @@ static stmtblock_t caf_init_block;
 tree gfc_static_ctors;
 
 
+/* Whether we've seen a symbol from an IEEE module in the namespace.  */
+static int seen_ieee_symbol;
+
 /* Function declarations for builtin library functions.  */
 
 tree gfor_fndecl_pause_numeric;
@@ -118,6 +121,8 @@ tree gfor_fndecl_in_unpack;
 tree gfor_fndecl_associated;
 tree gfor_fndecl_system_clock4;
 tree gfor_fndecl_system_clock8;
+tree gfor_fndecl_ieee_procedure_entry;
+tree gfor_fndecl_ieee_procedure_exit;
 
 
 /* Coarray run-time library function decls.  */
@@ -1376,8 +1381,9 @@ gfc_get_symbol_decl (gfc_symbol * sym)
 
   /* Special case for array-valued named constants from intrinsic
      procedures; those are inlined.  */
-  if (sym->attr.use_assoc && sym->from_intmod
+  if (sym->attr.use_assoc && sym->attr.flavor == FL_PARAMETER
-      && sym->attr.flavor == FL_PARAMETER)
+      && (sym->from_intmod == INTMOD_ISO_FORTRAN_ENV
+	  || sym->from_intmod == INTMOD_ISO_C_BINDING))
     intrinsic_array_parameter = true;
 
   /* If use associated compilation, use the module
@@ -3269,6 +3275,14 @@ gfc_build_builtin_function_decls (void)
 	get_identifier (PREFIX("set_fpe")),
 	void_type_node, 1, integer_type_node);
 
+  gfor_fndecl_ieee_procedure_entry = gfc_build_library_function_decl (
+	get_identifier (PREFIX("ieee_procedure_entry")),
+	void_type_node, 1, pvoid_type_node);
+
+  gfor_fndecl_ieee_procedure_exit = gfc_build_library_function_decl (
+	get_identifier (PREFIX("ieee_procedure_exit")),
+	void_type_node, 1, pvoid_type_node);
+
   /* Keep the array dimension in sync with the call, later in this file.  */
   gfor_fndecl_set_options = gfc_build_library_function_decl_with_spec (
 	get_identifier (PREFIX("set_options")), "..R",
@@ -5530,6 +5544,55 @@ gfc_generate_return (void)
 }
 
 
+static void
+is_from_ieee_module (gfc_symbol *sym)
+{
+  if (sym->from_intmod == INTMOD_IEEE_FEATURES
+      || sym->from_intmod == INTMOD_IEEE_EXCEPTIONS
+      || sym->from_intmod == INTMOD_IEEE_ARITHMETIC)
+    seen_ieee_symbol = 1;
+}
+
+
+static int
+is_ieee_module_used (gfc_namespace *ns)
+{
+  seen_ieee_symbol = 0;
+  gfc_traverse_ns (ns, is_from_ieee_module);
+  return seen_ieee_symbol;
+}
+
+
+static tree
+save_fp_state (stmtblock_t *block)
+{
+  tree type, fpstate, tmp;
+
+  type = build_array_type (char_type_node,
+	                   build_range_type (size_type_node, size_zero_node,
+					     size_int (32)));
+  fpstate = gfc_create_var (type, "fpstate");
+  fpstate = gfc_build_addr_expr (pvoid_type_node, fpstate);
+
+  tmp = build_call_expr_loc (input_location, gfor_fndecl_ieee_procedure_entry,
+			     1, fpstate);
+  gfc_add_expr_to_block (block, tmp);
+
+  return fpstate;
+}
+
+
+static void
+restore_fp_state (stmtblock_t *block, tree fpstate)
+{
+  tree tmp;
+
+  tmp = build_call_expr_loc (input_location, gfor_fndecl_ieee_procedure_exit,
+			     1, fpstate);
+  gfc_add_expr_to_block (block, tmp);
+}
+
+
 /* Generate code for a function.  */
 
 void
@@ -5539,13 +5602,14 @@ gfc_generate_function_code (gfc_namespace * ns)
   tree old_context;
   tree decl;
   tree tmp;
+  tree fpstate = NULL_TREE;
   stmtblock_t init, cleanup;
   stmtblock_t body;
   gfc_wrapped_block try_block;
   tree recurcheckvar = NULL_TREE;
   gfc_symbol *sym;
   gfc_symbol *previous_procedure_symbol;
-  int rank;
+  int rank, ieee;
   bool is_recursive;
 
   sym = ns->proc_name;
@@ -5636,6 +5700,12 @@ gfc_generate_function_code (gfc_namespace * ns)
       free (msg);
     }
 
+  /* Check if an IEEE module is used in the procedure.  If so, save
+     the floating point state.  */
+  ieee = is_ieee_module_used (ns);
+  if (ieee)
+    fpstate = save_fp_state (&init);
+
   /* Now generate the code for the body of this function.  */
   gfc_init_block (&body);
 
@@ -5719,6 +5789,10 @@ gfc_generate_function_code (gfc_namespace * ns)
       recurcheckvar = NULL;
     }
 
+  /* If IEEE modules are loaded, restore the floating-point state.  */
+  if (ieee)
+    restore_fp_state (&cleanup, fpstate);
+
   /* Finish the function body and add init and cleanup code.  */
   tmp = gfc_finish_block (&body);
   gfc_start_wrapped_block (&try_block, tmp);

gcc/testsuite/ChangeLog

@@ -1,3 +1,18 @@
+2014-06-28  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
+
+	PR fortran/29383
+	* lib/target-supports.exp (check_effective_target_fortran_ieee): 
+	New function.
+	* gfortran.dg/ieee/ieee.exp: New file.
+	* gfortran.dg/ieee/ieee_1.F90: New file.
+	* gfortran.dg/ieee/ieee_2.f90: New file.
+	* gfortran.dg/ieee/ieee_3.f90: New file.
+	* gfortran.dg/ieee/ieee_4.f90: New file.
+	* gfortran.dg/ieee/ieee_5.f90: New file.
+	* gfortran.dg/ieee/ieee_6.f90: New file.
+	* gfortran.dg/ieee/ieee_7.f90: New file.
+	* gfortran.dg/ieee/ieee_rounding_1.f90: New file.
+
 2014-06-28  Jonathan Wakely  <jwakely@redhat.com>
 
 	* g++.dg/cpp0x/elision_conv.C: New.

gcc/testsuite/gfortran.dg/ieee/ieee.exp

@@ -0,0 +1,59 @@
+# Copyright (C) 2013 Free Software Foundation, Inc.
+#
+# This file is part of GCC.
+#
+# GCC is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GCC is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GCC; see the file COPYING3.  If not see
+# <http://www.gnu.org/licenses/>.
+
+# GCC testsuite that uses the `dg.exp' driver.
+
+# Load support procs.
+load_lib gfortran-dg.exp
+load_lib target-supports.exp
+
+# Initialize `dg'.
+dg-init
+
+# Flags specified in each test
+global DEFAULT_FFLAGS
+if ![info exists DEFAULT_FFLAGS] then {
+    set DEFAULT_FFLAGS ""
+}
+
+# Flags for finding the IEEE modules
+if [info exists TOOL_OPTIONS] {
+   set specpath [get_multilibs ${TOOL_OPTIONS}]
+} else {
+   set specpath [get_multilibs]
+}
+set options "-fintrinsic-modules-path $specpath/libgfortran/"
+
+# Bail out if IEEE tests are not supported at all
+if ![check_effective_target_fortran_ieee $options ] {
+ return
+}
+
+# Add target-independent options to require IEEE compatibility
+set options "$DEFAULT_FFLAGS $options -fno-unsafe-math-optimizations -frounding-math -fsignaling-nans"
+
+# Add target-specific options to require IEEE compatibility
+set target_options [add_options_for_ieee ""]
+set options "$options $target_options"
+
+# Main loop.
+gfortran-dg-runtest [lsort \
+      [find $srcdir/$subdir *.\[fF\]{,90,95,03,08} ] ] $options
+
+# All done.
+dg-finish

gcc/testsuite/gfortran.dg/ieee/ieee_1.F90

@@ -0,0 +1,174 @@
+! { dg-do run }
+! { dg-additional-options "-ffree-line-length-none -O0" }
+!
+! Use dg-additional-options rather than dg-options to avoid overwriting the
+! default IEEE options which are passed by ieee.exp and necessary.
+
+  use ieee_features, only : ieee_datatype, ieee_denormal, ieee_divide, &
+      ieee_halting, ieee_inexact_flag, ieee_inf, ieee_invalid_flag, &
+      ieee_nan, ieee_rounding, ieee_sqrt, ieee_underflow_flag
+  use ieee_exceptions
+
+  implicit none
+
+  interface use_real
+    procedure use_real_4, use_real_8
+  end interface use_real
+
+  type(ieee_flag_type), parameter :: x(5) = &
+    [ IEEE_INVALID, IEEE_OVERFLOW, IEEE_DIVIDE_BY_ZERO, &
+      IEEE_UNDERFLOW, IEEE_INEXACT ]
+  logical :: l(5) = .false.
+  character(len=5) :: s
+
+#define FLAGS_STRING(S) \
+  call ieee_get_flag(x, l) ; \
+  write(S,"(5(A1))") merge(["I","O","Z","U","P"],[" "," "," "," "," "],l)
+
+#define CHECK_FLAGS(expected) \
+  FLAGS_STRING(s) ; \
+  if (s /= expected) then ; \
+    write (*,"(A,I0,A,A)") "Flags at line ", __LINE__, ": ", s ; \
+    call abort ; \
+  end if ; \
+  call check_flag_sub
+
+  real :: sx
+  double precision :: dx
+
+  ! This file tests IEEE_SET_FLAG and IEEE_GET_FLAG
+
+  !!!! IEEE float
+
+  ! Initial flags are all off
+  CHECK_FLAGS("     ")
+
+  ! Check we can clear them
+  call ieee_set_flag(ieee_all, .false.)
+  CHECK_FLAGS("     ")
+
+  ! Raise invalid, then clear
+  sx = -1
+  call use_real(sx)
+  sx = sqrt(sx)
+  call use_real(sx)
+  CHECK_FLAGS("I    ")
+  call ieee_set_flag(ieee_all, .false.)
+  CHECK_FLAGS("     ")
+
+  ! Raise overflow and precision
+  sx = huge(sx)
+  CHECK_FLAGS("     ")
+  sx = sx*sx
+  CHECK_FLAGS(" O  P")
+  call use_real(sx)
+
+  ! Also raise divide-by-zero
+  sx = 0
+  sx = 1 / sx
+  CHECK_FLAGS(" OZ P")
+  call use_real(sx)
+
+  ! Clear them
+  call ieee_set_flag([ieee_overflow,ieee_inexact,&
+                      ieee_divide_by_zero],[.false.,.false.,.true.])
+  CHECK_FLAGS("  Z  ")
+  call ieee_set_flag(ieee_divide_by_zero, .false.)
+  CHECK_FLAGS("     ")
+
+  ! Raise underflow
+  sx = tiny(sx)
+  CHECK_FLAGS("     ")
+  sx = sx / 10
+  call use_real(sx)
+  CHECK_FLAGS("   UP")
+
+  ! Raise everything
+  call ieee_set_flag(ieee_all, .true.)
+  CHECK_FLAGS("IOZUP")
+
+  ! And clear
+  call ieee_set_flag(ieee_all, .false.)
+  CHECK_FLAGS("     ")
+
+  !!!! IEEE double
+
+  ! Initial flags are all off
+  CHECK_FLAGS("     ")
+
+  ! Check we can clear them
+  call ieee_set_flag(ieee_all, .false.)
+  CHECK_FLAGS("     ")
+
+  ! Raise invalid, then clear
+  dx = -1
+  call use_real(dx)
+  dx = sqrt(dx)
+  call use_real(dx)
+  CHECK_FLAGS("I    ")
+  call ieee_set_flag(ieee_all, .false.)
+  CHECK_FLAGS("     ")
+
+  ! Raise overflow and precision
+  dx = huge(dx)
+  CHECK_FLAGS("     ")
+  dx = dx*dx
+  CHECK_FLAGS(" O  P")
+  call use_real(dx)
+
+  ! Also raise divide-by-zero
+  dx = 0
+  dx = 1 / dx
+  CHECK_FLAGS(" OZ P")
+  call use_real(dx)
+
+  ! Clear them
+  call ieee_set_flag([ieee_overflow,ieee_inexact,&
+                      ieee_divide_by_zero],[.false.,.false.,.true.])
+  CHECK_FLAGS("  Z  ")
+  call ieee_set_flag(ieee_divide_by_zero, .false.)
+  CHECK_FLAGS("     ")
+
+  ! Raise underflow
+  dx = tiny(dx)
+  CHECK_FLAGS("     ")
+  dx = dx / 10
+  CHECK_FLAGS("   UP")
+  call use_real(dx)
+
+  ! Raise everything
+  call ieee_set_flag(ieee_all, .true.)
+  CHECK_FLAGS("IOZUP")
+
+  ! And clear
+  call ieee_set_flag(ieee_all, .false.)
+  CHECK_FLAGS("     ")
+
+contains
+
+  subroutine check_flag_sub
+    use ieee_exceptions
+    logical :: l(5) = .false.
+    type(ieee_flag_type), parameter :: x(5) = &
+      [ IEEE_INVALID, IEEE_OVERFLOW, IEEE_DIVIDE_BY_ZERO, &
+        IEEE_UNDERFLOW, IEEE_INEXACT ]
+    call ieee_get_flag(x, l)
+
+    if (any(l)) then
+      print *, "Flags not cleared in subroutine"
+      call abort
+    end if
+  end subroutine
+
+  ! Interface to a routine that avoids calculations to be optimized out,
+  ! making it appear that we use the result
+  subroutine use_real_4(x)
+    real :: x
+    if (x == 123456.789) print *, "toto"
+  end subroutine
+  subroutine use_real_8(x)
+    double precision :: x
+    if (x == 123456.789) print *, "toto"
+  end subroutine
+
+end

gcc/testsuite/gfortran.dg/ieee/ieee_2.f90

@@ -0,0 +1,413 @@
+! { dg-do run }
+
+  use, intrinsic :: ieee_features
+  use, intrinsic :: ieee_exceptions
+  use, intrinsic :: ieee_arithmetic
+  implicit none
+
+  interface check_equal
+    procedure check_equal_float, check_equal_double
+  end interface
+
+  interface check_not_equal
+    procedure check_not_equal_float, check_not_equal_double
+  end interface
+
+  real :: sx1, sx2, sx3
+  double precision :: dx1, dx2, dx3
+  type(ieee_round_type) :: mode
+
+  ! Test IEEE_COPY_SIGN
+  sx1 = 1.3
+  if (ieee_copy_sign(sx1, sx1) /= sx1) call abort
+  if (ieee_copy_sign(sx1, -sx1) /= -sx1) call abort
+  if (ieee_copy_sign(sx1, 1.) /= sx1) call abort
+  if (ieee_copy_sign(sx1, -1.) /= -sx1) call abort
+  sx1 = huge(sx1)
+  if (ieee_copy_sign(sx1, sx1) /= sx1) call abort
+  if (ieee_copy_sign(sx1, -sx1) /= -sx1) call abort
+  if (ieee_copy_sign(sx1, 1.) /= sx1) call abort
+  if (ieee_copy_sign(sx1, -1.) /= -sx1) call abort
+  sx1 = ieee_value(sx1, ieee_positive_inf)
+  if (ieee_copy_sign(sx1, sx1) /= sx1) call abort
+  if (ieee_copy_sign(sx1, -sx1) /= -sx1) call abort
+  if (ieee_copy_sign(sx1, 1.) /= sx1) call abort
+  if (ieee_copy_sign(sx1, -1.) /= -sx1) call abort
+  sx1 = tiny(sx1)
+  if (ieee_copy_sign(sx1, sx1) /= sx1) call abort
+  if (ieee_copy_sign(sx1, -sx1) /= -sx1) call abort
+  if (ieee_copy_sign(sx1, 1.) /= sx1) call abort
+  if (ieee_copy_sign(sx1, -1.) /= -sx1) call abort
+  sx1 = tiny(sx1)
+  sx1 = sx1 / 101
+  if (ieee_copy_sign(sx1, sx1) /= sx1) call abort
+  if (ieee_copy_sign(sx1, -sx1) /= -sx1) call abort
+  if (ieee_copy_sign(sx1, 1.) /= sx1) call abort
+  if (ieee_copy_sign(sx1, -1.) /= -sx1) call abort
+
+  sx1 = -1.3
+  if (ieee_copy_sign(sx1, sx1) /= sx1) call abort
+  if (ieee_copy_sign(sx1, -sx1) /= -sx1) call abort
+  if (ieee_copy_sign(sx1, 1.) /= abs(sx1)) call abort
+  if (ieee_copy_sign(sx1, -1.) /= -abs(sx1)) call abort
+  sx1 = -huge(sx1)
+  if (ieee_copy_sign(sx1, sx1) /= sx1) call abort
+  if (ieee_copy_sign(sx1, -sx1) /= -sx1) call abort
+  if (ieee_copy_sign(sx1, 1.) /= abs(sx1)) call abort
+  if (ieee_copy_sign(sx1, -1.) /= -abs(sx1)) call abort
+  sx1 = ieee_value(sx1, ieee_negative_inf)
+  if (ieee_copy_sign(sx1, sx1) /= sx1) call abort
+  if (ieee_copy_sign(sx1, -sx1) /= -sx1) call abort
+  if (ieee_copy_sign(sx1, 1.) /= abs(sx1)) call abort
+  if (ieee_copy_sign(sx1, -1.) /= -abs(sx1)) call abort
+  sx1 = -tiny(sx1)
+  if (ieee_copy_sign(sx1, sx1) /= sx1) call abort
+  if (ieee_copy_sign(sx1, -sx1) /= -sx1) call abort
+  if (ieee_copy_sign(sx1, 1.) /= abs(sx1)) call abort
+  if (ieee_copy_sign(sx1, -1.) /= -abs(sx1)) call abort
+  sx1 = -tiny(sx1)
+  sx1 = sx1 / 101
+  if (ieee_copy_sign(sx1, sx1) /= sx1) call abort
+  if (ieee_copy_sign(sx1, -sx1) /= -sx1) call abort
+  if (ieee_copy_sign(sx1, 1.) /= abs(sx1)) call abort
+  if (ieee_copy_sign(sx1, -1.) /= -abs(sx1)) call abort
+
+  if (ieee_class(ieee_copy_sign(0., -1.)) /= ieee_negative_zero) call abort
+  if (ieee_class(ieee_copy_sign(-0., -1.)) /= ieee_negative_zero) call abort
+  if (ieee_class(ieee_copy_sign(0., 1.)) /= ieee_positive_zero) call abort
+  if (ieee_class(ieee_copy_sign(-0., 1.)) /= ieee_positive_zero) call abort
+
+  sx1 = ieee_value(0., ieee_quiet_nan)
+  if (ieee_class(ieee_copy_sign(sx1, 1.)) /= ieee_quiet_nan) call abort
+  if (ieee_class(ieee_copy_sign(sx1, -1.)) /= ieee_quiet_nan) call abort
+
+  dx1 = 1.3
+  if (ieee_copy_sign(dx1, dx1) /= dx1) call abort
+  if (ieee_copy_sign(dx1, -dx1) /= -dx1) call abort
+  if (ieee_copy_sign(dx1, 1.) /= dx1) call abort
+  if (ieee_copy_sign(dx1, -1.d0) /= -dx1) call abort
+  dx1 = huge(dx1)
+  if (ieee_copy_sign(dx1, dx1) /= dx1) call abort
+  if (ieee_copy_sign(dx1, -dx1) /= -dx1) call abort
+  if (ieee_copy_sign(dx1, 1.d0) /= dx1) call abort
+  if (ieee_copy_sign(dx1, -1.) /= -dx1) call abort
+  dx1 = ieee_value(dx1, ieee_positive_inf)
+  if (ieee_copy_sign(dx1, dx1) /= dx1) call abort
+  if (ieee_copy_sign(dx1, -dx1) /= -dx1) call abort
+  if (ieee_copy_sign(dx1, 1.) /= dx1) call abort
+  if (ieee_copy_sign(dx1, -1.d0) /= -dx1) call abort
+  dx1 = tiny(dx1)
+  if (ieee_copy_sign(dx1, dx1) /= dx1) call abort
+  if (ieee_copy_sign(dx1, -dx1) /= -dx1) call abort
+  if (ieee_copy_sign(dx1, 1.d0) /= dx1) call abort
+  if (ieee_copy_sign(dx1, -1.) /= -dx1) call abort
+  dx1 = tiny(dx1)
+  dx1 = dx1 / 101
+  if (ieee_copy_sign(dx1, dx1) /= dx1) call abort
+  if (ieee_copy_sign(dx1, -dx1) /= -dx1) call abort
+  if (ieee_copy_sign(dx1, 1.) /= dx1) call abort
+  if (ieee_copy_sign(dx1, -1.d0) /= -dx1) call abort
+
+  dx1 = -1.3d0
+  if (ieee_copy_sign(dx1, dx1) /= dx1) call abort
+  if (ieee_copy_sign(dx1, -dx1) /= -dx1) call abort
+  if (ieee_copy_sign(dx1, 1.d0) /= abs(dx1)) call abort
+  if (ieee_copy_sign(dx1, -1.) /= -abs(dx1)) call abort
+  dx1 = -huge(dx1)
+  if (ieee_copy_sign(dx1, dx1) /= dx1) call abort
+  if (ieee_copy_sign(dx1, -dx1) /= -dx1) call abort
+  if (ieee_copy_sign(dx1, 1.) /= abs(dx1)) call abort
+  if (ieee_copy_sign(dx1, -1.d0) /= -abs(dx1)) call abort
+  dx1 = ieee_value(dx1, ieee_negative_inf)
+  if (ieee_copy_sign(dx1, dx1) /= dx1) call abort
+  if (ieee_copy_sign(dx1, -dx1) /= -dx1) call abort
+  if (ieee_copy_sign(dx1, 1.d0) /= abs(dx1)) call abort
+  if (ieee_copy_sign(dx1, -1.) /= -abs(dx1)) call abort
+  dx1 = -tiny(dx1)
+  if (ieee_copy_sign(dx1, dx1) /= dx1) call abort
+  if (ieee_copy_sign(dx1, -dx1) /= -dx1) call abort
+  if (ieee_copy_sign(dx1, 1.) /= abs(dx1)) call abort
+  if (ieee_copy_sign(dx1, -1.d0) /= -abs(dx1)) call abort
+  dx1 = -tiny(dx1)
+  dx1 = dx1 / 101
+  if (ieee_copy_sign(dx1, dx1) /= dx1) call abort
+  if (ieee_copy_sign(dx1, -dx1) /= -dx1) call abort
+  if (ieee_copy_sign(dx1, 1.d0) /= abs(dx1)) call abort
+  if (ieee_copy_sign(dx1, -1.) /= -abs(dx1)) call abort
+
+  if (ieee_class(ieee_copy_sign(0.d0, -1.)) /= ieee_negative_zero) call abort
+  if (ieee_class(ieee_copy_sign(-0.d0, -1.)) /= ieee_negative_zero) call abort
+  if (ieee_class(ieee_copy_sign(0.d0, 1.)) /= ieee_positive_zero) call abort
+  if (ieee_class(ieee_copy_sign(-0.d0, 1.)) /= ieee_positive_zero) call abort
+
+  dx1 = ieee_value(0.d0, ieee_quiet_nan)
+  if (ieee_class(ieee_copy_sign(dx1, 1.d0)) /= ieee_quiet_nan) call abort
+  if (ieee_class(ieee_copy_sign(dx1, -1.)) /= ieee_quiet_nan) call abort
+
+  ! Test IEEE_LOGB
+
+  if (ieee_logb(1.17) /= exponent(1.17) - 1) call abort
+  if (ieee_logb(-1.17) /= exponent(-1.17) - 1) call abort
+  if (ieee_logb(huge(sx1)) /= exponent(huge(sx1)) - 1) call abort
+  if (ieee_logb(-huge(sx1)) /= exponent(-huge(sx1)) - 1) call abort
+  if (ieee_logb(tiny(sx1)) /= exponent(tiny(sx1)) - 1) call abort
+  if (ieee_logb(-tiny(sx1)) /= exponent(-tiny(sx1)) - 1) call abort
+
+  if (ieee_class(ieee_logb(0.)) /= ieee_negative_inf) call abort
+  if (ieee_class(ieee_logb(-0.)) /= ieee_negative_inf) call abort
+
+  sx1 = ieee_value(sx1, ieee_positive_inf)
+  if (ieee_class(ieee_logb(sx1)) /= ieee_positive_inf) call abort
+  if (ieee_class(ieee_logb(-sx1)) /= ieee_positive_inf) call abort
+
+  sx1 = ieee_value(sx1, ieee_quiet_nan)
+  if (ieee_class(ieee_logb(sx1)) /= ieee_quiet_nan) call abort
+
+  if (ieee_logb(1.17d0) /= exponent(1.17d0) - 1) call abort
+  if (ieee_logb(-1.17d0) /= exponent(-1.17d0) - 1) call abort
+  if (ieee_logb(huge(dx1)) /= exponent(huge(dx1)) - 1) call abort
+  if (ieee_logb(-huge(dx1)) /= exponent(-huge(dx1)) - 1) call abort
+  if (ieee_logb(tiny(dx1)) /= exponent(tiny(dx1)) - 1) call abort
+  if (ieee_logb(-tiny(dx1)) /= exponent(-tiny(dx1)) - 1) call abort
+
+  if (ieee_class(ieee_logb(0.d0)) /= ieee_negative_inf) call abort
+  if (ieee_class(ieee_logb(-0.d0)) /= ieee_negative_inf) call abort
+
+  dx1 = ieee_value(dx1, ieee_positive_inf)
+  if (ieee_class(ieee_logb(dx1)) /= ieee_positive_inf) call abort
+  if (ieee_class(ieee_logb(-dx1)) /= ieee_positive_inf) call abort
+
+  dx1 = ieee_value(dx1, ieee_quiet_nan)
+  if (ieee_class(ieee_logb(dx1)) /= ieee_quiet_nan) call abort
+
+  ! Test IEEE_NEXT_AFTER
+
+  if (ieee_next_after(0.12, 1.0) /= nearest(0.12, 1.0)) call abort
+  if (ieee_next_after(0.12, -1.0) /= nearest(0.12, -1.0)) call abort
+
+  sx1 = 0.12
+  if (ieee_next_after(sx1, sx1) /= sx1) call abort
+  sx1 = -0.12
+  if (ieee_next_after(sx1, sx1) /= sx1) call abort
+  sx1 = huge(sx1)
+  if (ieee_next_after(sx1, sx1) /= sx1) call abort
+  sx1 = tiny(sx1)
+  if (ieee_next_after(sx1, sx1) /= sx1) call abort
+  sx1 = 0
+  if (ieee_next_after(sx1, sx1) /= sx1) call abort
+  sx1 = ieee_value(sx1, ieee_negative_inf)
+  if (ieee_next_after(sx1, sx1) /= sx1) call abort
+  sx1 = ieee_value(sx1, ieee_quiet_nan)
+  if (ieee_class(ieee_next_after(sx1, sx1)) /= ieee_quiet_nan) call abort
+
+  if (ieee_next_after(0., 1.0) <= 0) call abort
+  if (ieee_next_after(0., -1.0) >= 0) call abort
+  sx1 = ieee_next_after(huge(sx1), ieee_value(sx1, ieee_negative_inf))
+  if (.not. sx1 < huge(sx1)) call abort
+  sx1 = ieee_next_after(huge(sx1), ieee_value(sx1, ieee_positive_inf))
+  if (ieee_class(sx1) /= ieee_positive_inf) call abort
+  sx1 = ieee_next_after(-tiny(sx1), 1.0)
+  if (ieee_class(sx1) /= ieee_negative_denormal) call abort
+
+  if (ieee_next_after(0.12d0, 1.0d0) /= nearest(0.12d0, 1.0)) call abort
+  if (ieee_next_after(0.12d0, -1.0) /= nearest(0.12d0, -1.0)) call abort
+
+  dx1 = 0.12
+  if (ieee_next_after(dx1, dx1) /= dx1) call abort
+  dx1 = -0.12
+  if (ieee_next_after(dx1, dx1) /= dx1) call abort
+  dx1 = huge(dx1)
+  if (ieee_next_after(dx1, dx1) /= dx1) call abort
+  dx1 = tiny(dx1)
+  if (ieee_next_after(dx1, dx1) /= dx1) call abort
+  dx1 = 0
+  if (ieee_next_after(dx1, dx1) /= dx1) call abort
+  dx1 = ieee_value(dx1, ieee_negative_inf)
+  if (ieee_next_after(dx1, dx1) /= dx1) call abort
+  dx1 = ieee_value(dx1, ieee_quiet_nan)
+  if (ieee_class(ieee_next_after(dx1, dx1)) /= ieee_quiet_nan) call abort
+
+  if (ieee_next_after(0.d0, 1.0) <= 0) call abort
+  if (ieee_next_after(0.d0, -1.0d0) >= 0) call abort
+  dx1 = ieee_next_after(huge(dx1), ieee_value(dx1, ieee_negative_inf))
+  if (.not. dx1 < huge(dx1)) call abort
+  dx1 = ieee_next_after(huge(dx1), ieee_value(dx1, ieee_positive_inf))
+  if (ieee_class(dx1) /= ieee_positive_inf) call abort
+  dx1 = ieee_next_after(-tiny(dx1), 1.0d0)
+  if (ieee_class(dx1) /= ieee_negative_denormal) call abort
+
+  ! Test IEEE_REM
+
+  if (ieee_rem(4.0, 3.0) /= 1.0) call abort
+  if (ieee_rem(-4.0, 3.0) /= -1.0) call abort
+  if (ieee_rem(2.0, 3.0d0) /= -1.0d0) call abort
+  if (ieee_rem(-2.0, 3.0d0) /= 1.0d0) call abort
+  if (ieee_rem(2.0d0, 3.0d0) /= -1.0d0) call abort
+  if (ieee_rem(-2.0d0, 3.0d0) /= 1.0d0) call abort
+
+  if (ieee_class(ieee_rem(ieee_value(0., ieee_quiet_nan), 1.0)) &
+      /= ieee_quiet_nan) call abort
+  if (ieee_class(ieee_rem(1.0, ieee_value(0.d0, ieee_quiet_nan))) &
+      /= ieee_quiet_nan) call abort
+
+  if (ieee_class(ieee_rem(ieee_value(0., ieee_positive_inf), 1.0)) &
+      /= ieee_quiet_nan) call abort
+  if (ieee_class(ieee_rem(ieee_value(0.d0, ieee_negative_inf), 1.0)) &
+      /= ieee_quiet_nan) call abort
+  if (ieee_rem(-1.0, ieee_value(0., ieee_positive_inf)) &
+      /= -1.0) call abort
+  if (ieee_rem(1.0, ieee_value(0.d0, ieee_negative_inf)) &
+      /= 1.0) call abort
+
+
+  ! Test IEEE_RINT
+
+  if (ieee_support_rounding (ieee_nearest, sx1)) then
+    call ieee_get_rounding_mode (mode)
+    call ieee_set_rounding_mode (ieee_nearest)
+    sx1 = 7 / 3.
+    sx1 = ieee_rint (sx1)
+    call ieee_set_rounding_mode (mode)
+    if (sx1 /= 2) call abort
+  end if
+
+  if (ieee_support_rounding (ieee_up, sx1)) then
+    call ieee_get_rounding_mode (mode)
+    call ieee_set_rounding_mode (ieee_up)
+    sx1 = 7 / 3.
+    sx1 = ieee_rint (sx1)
+    call ieee_set_rounding_mode (mode)
+    if (sx1 /= 3) call abort
+  end if
+
+  if (ieee_support_rounding (ieee_down, sx1)) then
+    call ieee_get_rounding_mode (mode)
+    call ieee_set_rounding_mode (ieee_down)
+    sx1 = 7 / 3.
+    sx1 = ieee_rint (sx1)
+    call ieee_set_rounding_mode (mode)
+    if (sx1 /= 2) call abort
+  end if
+
+  if (ieee_support_rounding (ieee_to_zero, sx1)) then
+    call ieee_get_rounding_mode (mode)
+    call ieee_set_rounding_mode (ieee_to_zero)
+    sx1 = 7 / 3.
+    sx1 = ieee_rint (sx1)
+    call ieee_set_rounding_mode (mode)
+    if (sx1 /= 2) call abort
+  end if
+
+  if (ieee_class(ieee_rint(0.)) /= ieee_positive_zero) call abort
+  if (ieee_class(ieee_rint(-0.)) /= ieee_negative_zero) call abort
+
+  if (ieee_support_rounding (ieee_nearest, dx1)) then
+    call ieee_get_rounding_mode (mode)
+    call ieee_set_rounding_mode (ieee_nearest)
+    dx1 = 7 / 3.d0
+    dx1 = ieee_rint (dx1)
+    call ieee_set_rounding_mode (mode)
+    if (dx1 /= 2) call abort
+  end if
+
+  if (ieee_support_rounding (ieee_up, dx1)) then
+    call ieee_get_rounding_mode (mode)
+    call ieee_set_rounding_mode (ieee_up)
+    dx1 = 7 / 3.d0
+    dx1 = ieee_rint (dx1)
+    call ieee_set_rounding_mode (mode)
+    if (dx1 /= 3) call abort
+  end if
+
+  if (ieee_support_rounding (ieee_down, dx1)) then
+    call ieee_get_rounding_mode (mode)
+    call ieee_set_rounding_mode (ieee_down)
+    dx1 = 7 / 3.d0
+    dx1 = ieee_rint (dx1)
+    call ieee_set_rounding_mode (mode)
+    if (dx1 /= 2) call abort
+  end if
+
+  if (ieee_support_rounding (ieee_to_zero, dx1)) then
+    call ieee_get_rounding_mode (mode)
+    call ieee_set_rounding_mode (ieee_to_zero)
+    dx1 = 7 / 3.d0
+    dx1 = ieee_rint (dx1)
+    call ieee_set_rounding_mode (mode)
+    if (dx1 /= 2) call abort
+  end if
+
+  if (ieee_class(ieee_rint(0.d0)) /= ieee_positive_zero) call abort
+  if (ieee_class(ieee_rint(-0.d0)) /= ieee_negative_zero) call abort
+
+  ! Test IEEE_SCALB
+
+  sx1 = 1
+  if (ieee_scalb(sx1, 2) /= 4.) call abort
+  if (ieee_scalb(-sx1, 2) /= -4.) call abort
+  if (ieee_scalb(sx1, -2) /= 1/4.) call abort
+  if (ieee_scalb(-sx1, -2) /= -1/4.) call abort
+  if (ieee_class(ieee_scalb(sx1, huge(0))) /= ieee_positive_inf) call abort
+  if (ieee_class(ieee_scalb(-sx1, huge(0))) /= ieee_negative_inf) call abort
+  if (ieee_class(ieee_scalb(sx1, -huge(0))) /= ieee_positive_zero) call abort
+  if (ieee_class(ieee_scalb(-sx1, -huge(0))) /= ieee_negative_zero) call abort
+
+  sx1 = ieee_value(sx1, ieee_quiet_nan)
+  if (ieee_class(ieee_scalb(sx1, 1)) /= ieee_quiet_nan) call abort
+  sx1 = ieee_value(sx1, ieee_positive_inf)
+  if (ieee_class(ieee_scalb(sx1, -42)) /= ieee_positive_inf) call abort
+  sx1 = ieee_value(sx1, ieee_negative_inf)
+  if (ieee_class(ieee_scalb(sx1, -42)) /= ieee_negative_inf) call abort
+
+  dx1 = 1
+  if (ieee_scalb(dx1, 2) /= 4.d0) call abort
+  if (ieee_scalb(-dx1, 2) /= -4.d0) call abort
+  if (ieee_scalb(dx1, -2) /= 1/4.d0) call abort
+  if (ieee_scalb(-dx1, -2) /= -1/4.d0) call abort
+  if (ieee_class(ieee_scalb(dx1, huge(0))) /= ieee_positive_inf) call abort
+  if (ieee_class(ieee_scalb(-dx1, huge(0))) /= ieee_negative_inf) call abort
+  if (ieee_class(ieee_scalb(dx1, -huge(0))) /= ieee_positive_zero) call abort
+  if (ieee_class(ieee_scalb(-dx1, -huge(0))) /= ieee_negative_zero) call abort
+
+  dx1 = ieee_value(dx1, ieee_quiet_nan)
+  if (ieee_class(ieee_scalb(dx1, 1)) /= ieee_quiet_nan) call abort
+  dx1 = ieee_value(dx1, ieee_positive_inf)
+  if (ieee_class(ieee_scalb(dx1, -42)) /= ieee_positive_inf) call abort
+  dx1 = ieee_value(dx1, ieee_negative_inf)
+  if (ieee_class(ieee_scalb(dx1, -42)) /= ieee_negative_inf) call abort
+
+contains
+
+  subroutine check_equal_float (x, y)
+    real, intent(in) :: x, y
+    if (x /= y) then
+      print *, x, y
+      call abort
+    end if
+  end subroutine
+
+  subroutine check_equal_double (x, y)
+    double precision, intent(in) :: x, y
+    if (x /= y) then
+      print *, x, y
+      call abort
+    end if
+  end subroutine
+
+  subroutine check_not_equal_float (x, y)
+    real, intent(in) :: x, y
+    if (x == y) then
+      print *, x, y
+      call abort
+    end if
+  end subroutine
+
+  subroutine check_not_equal_double (x, y)
+    double precision, intent(in) :: x, y
+    if (x == y) then
+      print *, x, y
+      call abort
+    end if
+  end subroutine
+
+end

gcc/testsuite/gfortran.dg/ieee/ieee_3.f90

@@ -0,0 +1,167 @@
+! { dg-do run }
+
+  use :: ieee_arithmetic
+  implicit none
+
+  real :: sx1, sx2, sx3
+  double precision :: dx1, dx2, dx3
+  integer, parameter :: s = kind(sx1), d = kind(dx1)
+  type(ieee_round_type) :: mode
+
+  ! Test IEEE_IS_FINITE
+
+  if (ieee_support_datatype(0._s)) then
+    if (.not. ieee_is_finite(0.2_s)) call abort
+    if (.not. ieee_is_finite(-0.2_s)) call abort
+    if (.not. ieee_is_finite(0._s)) call abort
+    if (.not. ieee_is_finite(-0._s)) call abort
+    if (.not. ieee_is_finite(tiny(0._s))) call abort
+    if (.not. ieee_is_finite(tiny(0._s)/100)) call abort
+    if (.not. ieee_is_finite(huge(0._s))) call abort
+    if (.not. ieee_is_finite(-huge(0._s))) call abort
+    sx1 = huge(sx1)
+    if (ieee_is_finite(2*sx1)) call abort
+    if (ieee_is_finite(2*(-sx1))) call abort
+    sx1 = ieee_value(sx1, ieee_quiet_nan)
+    if (ieee_is_finite(sx1)) call abort
+  end if
+
+  if (ieee_support_datatype(0._d)) then
+    if (.not. ieee_is_finite(0.2_d)) call abort
+    if (.not. ieee_is_finite(-0.2_d)) call abort
+    if (.not. ieee_is_finite(0._d)) call abort
+    if (.not. ieee_is_finite(-0._d)) call abort
+    if (.not. ieee_is_finite(tiny(0._d))) call abort
+    if (.not. ieee_is_finite(tiny(0._d)/100)) call abort
+    if (.not. ieee_is_finite(huge(0._d))) call abort
+    if (.not. ieee_is_finite(-huge(0._d))) call abort
+    dx1 = huge(dx1)
+    if (ieee_is_finite(2*dx1)) call abort
+    if (ieee_is_finite(2*(-dx1))) call abort
+    dx1 = ieee_value(dx1, ieee_quiet_nan)
+    if (ieee_is_finite(dx1)) call abort
+  end if
+
+  ! Test IEEE_IS_NAN
+
+  if (ieee_support_datatype(0._s)) then
+    if (ieee_is_nan(0.2_s)) call abort
+    if (ieee_is_nan(-0.2_s)) call abort
+    if (ieee_is_nan(0._s)) call abort
+    if (ieee_is_nan(-0._s)) call abort
+    if (ieee_is_nan(tiny(0._s))) call abort
+    if (ieee_is_nan(tiny(0._s)/100)) call abort
+    if (ieee_is_nan(huge(0._s))) call abort
+    if (ieee_is_nan(-huge(0._s))) call abort
+    sx1 = huge(sx1)
+    if (ieee_is_nan(2*sx1)) call abort
+    if (ieee_is_nan(2*(-sx1))) call abort
+    sx1 = ieee_value(sx1, ieee_quiet_nan)
+    if (.not. ieee_is_nan(sx1)) call abort
+    sx1 = -1
+    if (.not. ieee_is_nan(sqrt(sx1))) call abort
+  end if
+
+  if (ieee_support_datatype(0._d)) then
+    if (ieee_is_nan(0.2_d)) call abort
+    if (ieee_is_nan(-0.2_d)) call abort
+    if (ieee_is_nan(0._d)) call abort
+    if (ieee_is_nan(-0._d)) call abort
+    if (ieee_is_nan(tiny(0._d))) call abort
+    if (ieee_is_nan(tiny(0._d)/100)) call abort
+    if (ieee_is_nan(huge(0._d))) call abort
+    if (ieee_is_nan(-huge(0._d))) call abort
+    dx1 = huge(dx1)
+    if (ieee_is_nan(2*dx1)) call abort
+    if (ieee_is_nan(2*(-dx1))) call abort
+    dx1 = ieee_value(dx1, ieee_quiet_nan)
+    if (.not. ieee_is_nan(dx1)) call abort
+    dx1 = -1
+    if (.not. ieee_is_nan(sqrt(dx1))) call abort
+  end if
+
+  ! IEEE_IS_NEGATIVE
+
+  if (ieee_support_datatype(0._s)) then
+    if (ieee_is_negative(0.2_s)) call abort
+    if (.not. ieee_is_negative(-0.2_s)) call abort
+    if (ieee_is_negative(0._s)) call abort
+    if (.not. ieee_is_negative(-0._s)) call abort
+    if (ieee_is_negative(tiny(0._s))) call abort
+    if (ieee_is_negative(tiny(0._s)/100)) call abort
+    if (.not. ieee_is_negative(-tiny(0._s))) call abort
+    if (.not. ieee_is_negative(-tiny(0._s)/100)) call abort
+    if (ieee_is_negative(huge(0._s))) call abort
+    if (.not. ieee_is_negative(-huge(0._s))) call abort
+    sx1 = huge(sx1)
+    if (ieee_is_negative(2*sx1)) call abort
+    if (.not. ieee_is_negative(2*(-sx1))) call abort
+    sx1 = ieee_value(sx1, ieee_quiet_nan)
+    if (ieee_is_negative(sx1)) call abort
+    sx1 = -1
+    if (ieee_is_negative(sqrt(sx1))) call abort
+  end if
+
+  if (ieee_support_datatype(0._d)) then
+    if (ieee_is_negative(0.2_d)) call abort
+    if (.not. ieee_is_negative(-0.2_d)) call abort
+    if (ieee_is_negative(0._d)) call abort
+    if (.not. ieee_is_negative(-0._d)) call abort
+    if (ieee_is_negative(tiny(0._d))) call abort
+    if (ieee_is_negative(tiny(0._d)/100)) call abort
+    if (.not. ieee_is_negative(-tiny(0._d))) call abort
+    if (.not. ieee_is_negative(-tiny(0._d)/100)) call abort
+    if (ieee_is_negative(huge(0._d))) call abort
+    if (.not. ieee_is_negative(-huge(0._d))) call abort
+    dx1 = huge(dx1)
+    if (ieee_is_negative(2*dx1)) call abort
+    if (.not. ieee_is_negative(2*(-dx1))) call abort
+    dx1 = ieee_value(dx1, ieee_quiet_nan)
+    if (ieee_is_negative(dx1)) call abort
+    dx1 = -1
+    if (ieee_is_negative(sqrt(dx1))) call abort
+  end if
+
+  ! Test IEEE_IS_NORMAL
+
+  if (ieee_support_datatype(0._s)) then
+    if (.not. ieee_is_normal(0.2_s)) call abort
+    if (.not. ieee_is_normal(-0.2_s)) call abort
+    if (.not. ieee_is_normal(0._s)) call abort
+    if (.not. ieee_is_normal(-0._s)) call abort
+    if (.not. ieee_is_normal(tiny(0._s))) call abort
+    if (ieee_is_normal(tiny(0._s)/100)) call abort
+    if (.not. ieee_is_normal(-tiny(0._s))) call abort
+    if (ieee_is_normal(-tiny(0._s)/100)) call abort
+    if (.not. ieee_is_normal(huge(0._s))) call abort
+    if (.not. ieee_is_normal(-huge(0._s))) call abort
+    sx1 = huge(sx1)
+    if (ieee_is_normal(2*sx1)) call abort
+    if (ieee_is_normal(2*(-sx1))) call abort
+    sx1 = ieee_value(sx1, ieee_quiet_nan)
+    if (ieee_is_normal(sx1)) call abort
+    sx1 = -1
+    if (ieee_is_normal(sqrt(sx1))) call abort
+  end if
+
+  if (ieee_support_datatype(0._d)) then
+    if (.not. ieee_is_normal(0.2_d)) call abort
+    if (.not. ieee_is_normal(-0.2_d)) call abort
+    if (.not. ieee_is_normal(0._d)) call abort
+    if (.not. ieee_is_normal(-0._d)) call abort
+    if (.not. ieee_is_normal(tiny(0._d))) call abort
+    if (ieee_is_normal(tiny(0._d)/100)) call abort
+    if (.not. ieee_is_normal(-tiny(0._d))) call abort
+    if (ieee_is_normal(-tiny(0._d)/100)) call abort
+    if (.not. ieee_is_normal(huge(0._d))) call abort
+    if (.not. ieee_is_normal(-huge(0._d))) call abort
+    dx1 = huge(dx1)
+    if (ieee_is_normal(2*dx1)) call abort
+    if (ieee_is_normal(2*(-dx1))) call abort
+    dx1 = ieee_value(dx1, ieee_quiet_nan)
+    if (ieee_is_normal(dx1)) call abort
+    dx1 = -1
+    if (ieee_is_normal(sqrt(dx1))) call abort
+  end if
+
+end

gcc/testsuite/gfortran.dg/ieee/ieee_4.f90

@@ -0,0 +1,189 @@
+! { dg-do run }
+
+  use :: ieee_arithmetic
+  implicit none
+
+  real :: sx1, sx2, sx3
+  double precision :: dx1, dx2, dx3
+  integer, parameter :: s = kind(sx1), d = kind(dx1)
+  type(ieee_round_type) :: mode
+
+  ! Test IEEE_CLASS
+
+  if (ieee_support_datatype(0._s)) then
+    sx1 = 0.1_s
+    if (ieee_class(sx1) /= ieee_positive_normal) call abort
+    if (ieee_class(-sx1) /= ieee_negative_normal) call abort
+    sx1 = huge(sx1)
+    if (ieee_class(sx1) /= ieee_positive_normal) call abort
+    if (ieee_class(-sx1) /= ieee_negative_normal) call abort
+    if (ieee_class(2*sx1) /= ieee_positive_inf) call abort
+    if (ieee_class(2*(-sx1)) /= ieee_negative_inf) call abort
+    sx1 = tiny(sx1)
+    if (ieee_class(sx1) /= ieee_positive_normal) call abort
+    if (ieee_class(-sx1) /= ieee_negative_normal) call abort
+    if (ieee_class(sx1 / 2) /= ieee_positive_denormal) call abort
+    if (ieee_class((-sx1) / 2) /= ieee_negative_denormal) call abort
+    sx1 = -1
+    if (ieee_class(sqrt(sx1)) /= ieee_quiet_nan) call abort
+    sx1 = 0
+    if (ieee_class(sx1) /= ieee_positive_zero) call abort
+    if (ieee_class(-sx1) /= ieee_negative_zero) call abort
+  end if
+
+  if (ieee_support_datatype(0._d)) then
+    dx1 = 0.1_d
+    if (ieee_class(dx1) /= ieee_positive_normal) call abort
+    if (ieee_class(-dx1) /= ieee_negative_normal) call abort
+    dx1 = huge(dx1)
+    if (ieee_class(dx1) /= ieee_positive_normal) call abort
+    if (ieee_class(-dx1) /= ieee_negative_normal) call abort
+    if (ieee_class(2*dx1) /= ieee_positive_inf) call abort
+    if (ieee_class(2*(-dx1)) /= ieee_negative_inf) call abort
+    dx1 = tiny(dx1)
+    if (ieee_class(dx1) /= ieee_positive_normal) call abort
+    if (ieee_class(-dx1) /= ieee_negative_normal) call abort
+    if (ieee_class(dx1 / 2) /= ieee_positive_denormal) call abort
+    if (ieee_class((-dx1) / 2) /= ieee_negative_denormal) call abort
+    dx1 = -1
+    if (ieee_class(sqrt(dx1)) /= ieee_quiet_nan) call abort
+    dx1 = 0
+    if (ieee_class(dx1) /= ieee_positive_zero) call abort
+    if (ieee_class(-dx1) /= ieee_negative_zero) call abort
+  end if
+
+  ! Test IEEE_VALUE and IEEE_UNORDERED
+
+  if (ieee_support_datatype(0._s)) then
+    sx1 = ieee_value(sx1, ieee_quiet_nan)
+    if (.not. ieee_is_nan(sx1)) call abort
+    if (.not. ieee_unordered(sx1, sx1)) call abort
+    if (.not. ieee_unordered(sx1, 0._s)) call abort
+    if (.not. ieee_unordered(sx1, 0._d)) call abort
+    if (.not. ieee_unordered(0._s, sx1)) call abort
+    if (.not. ieee_unordered(0._d, sx1)) call abort
+    if (ieee_unordered(0._s, 0._s)) call abort
+
+    sx1 = ieee_value(sx1, ieee_positive_inf)
+    if (ieee_is_finite(sx1)) call abort
+    if (ieee_is_nan(sx1)) call abort
+    if (ieee_is_negative(sx1)) call abort
+    if (ieee_is_normal(sx1)) call abort
+
+    sx1 = ieee_value(sx1, ieee_negative_inf)
+    if (ieee_is_finite(sx1)) call abort
+    if (ieee_is_nan(sx1)) call abort
+    if (.not. ieee_is_negative(sx1)) call abort
+    if (ieee_is_normal(sx1)) call abort
+
+    sx1 = ieee_value(sx1, ieee_positive_normal)
+    if (.not. ieee_is_finite(sx1)) call abort
+    if (ieee_is_nan(sx1)) call abort
+    if (ieee_is_negative(sx1)) call abort
+    if (.not. ieee_is_normal(sx1)) call abort
+
+    sx1 = ieee_value(sx1, ieee_negative_normal)
+    if (.not. ieee_is_finite(sx1)) call abort
+    if (ieee_is_nan(sx1)) call abort
+    if (.not. ieee_is_negative(sx1)) call abort
+    if (.not. ieee_is_normal(sx1)) call abort
+
+    sx1 = ieee_value(sx1, ieee_positive_denormal)
+    if (.not. ieee_is_finite(sx1)) call abort
+    if (ieee_is_nan(sx1)) call abort
+    if (ieee_is_negative(sx1)) call abort
+    if (ieee_is_normal(sx1)) call abort
+    if (sx1 <= 0) call abort
+    if (sx1 >= tiny(sx1)) call abort
+
+    sx1 = ieee_value(sx1, ieee_negative_denormal)
+    if (.not. ieee_is_finite(sx1)) call abort
+    if (ieee_is_nan(sx1)) call abort
+    if (.not. ieee_is_negative(sx1)) call abort
+    if (ieee_is_normal(sx1)) call abort
+    if (sx1 >= 0) call abort
+    if (sx1 <= -tiny(sx1)) call abort
+
+    sx1 = ieee_value(sx1, ieee_positive_zero)
+    if (.not. ieee_is_finite(sx1)) call abort
+    if (ieee_is_nan(sx1)) call abort
+    if (ieee_is_negative(sx1)) call abort
+    if (.not. ieee_is_normal(sx1)) call abort
+    if (sx1 /= 0) call abort
+
+    sx1 = ieee_value(sx1, ieee_negative_zero)
+    if (.not. ieee_is_finite(sx1)) call abort
+    if (ieee_is_nan(sx1)) call abort
+    if (.not. ieee_is_negative(sx1)) call abort
+    if (.not. ieee_is_normal(sx1)) call abort
+    if (sx1 /= 0) call abort
+
+  end if
+
+  if (ieee_support_datatype(0._d)) then
+    dx1 = ieee_value(dx1, ieee_quiet_nan)
+    if (.not. ieee_is_nan(dx1)) call abort
+    if (.not. ieee_unordered(dx1, dx1)) call abort
+    if (.not. ieee_unordered(dx1, 0._s)) call abort
+    if (.not. ieee_unordered(dx1, 0._d)) call abort
+    if (.not. ieee_unordered(0._s, dx1)) call abort
+    if (.not. ieee_unordered(0._d, dx1)) call abort
+    if (ieee_unordered(0._d, 0._d)) call abort
+
+    dx1 = ieee_value(dx1, ieee_positive_inf)
+    if (ieee_is_finite(dx1)) call abort
+    if (ieee_is_nan(dx1)) call abort
+    if (ieee_is_negative(dx1)) call abort
+    if (ieee_is_normal(dx1)) call abort
+
+    dx1 = ieee_value(dx1, ieee_negative_inf)
+    if (ieee_is_finite(dx1)) call abort
+    if (ieee_is_nan(dx1)) call abort
+    if (.not. ieee_is_negative(dx1)) call abort
+    if (ieee_is_normal(dx1)) call abort
+
+    dx1 = ieee_value(dx1, ieee_positive_normal)
+    if (.not. ieee_is_finite(dx1)) call abort
+    if (ieee_is_nan(dx1)) call abort
+    if (ieee_is_negative(dx1)) call abort
+    if (.not. ieee_is_normal(dx1)) call abort
+
+    dx1 = ieee_value(dx1, ieee_negative_normal)
+    if (.not. ieee_is_finite(dx1)) call abort
+    if (ieee_is_nan(dx1)) call abort
+    if (.not. ieee_is_negative(dx1)) call abort
+    if (.not. ieee_is_normal(dx1)) call abort
+
+    dx1 = ieee_value(dx1, ieee_positive_denormal)
+    if (.not. ieee_is_finite(dx1)) call abort
+    if (ieee_is_nan(dx1)) call abort
+    if (ieee_is_negative(dx1)) call abort
+    if (ieee_is_normal(dx1)) call abort
+    if (dx1 <= 0) call abort
+    if (dx1 >= tiny(dx1)) call abort
+
+    dx1 = ieee_value(dx1, ieee_negative_denormal)
+    if (.not. ieee_is_finite(dx1)) call abort
+    if (ieee_is_nan(dx1)) call abort
+    if (.not. ieee_is_negative(dx1)) call abort
+    if (ieee_is_normal(dx1)) call abort
+    if (dx1 >= 0) call abort
+    if (dx1 <= -tiny(dx1)) call abort
+
+    dx1 = ieee_value(dx1, ieee_positive_zero)
+    if (.not. ieee_is_finite(dx1)) call abort
+    if (ieee_is_nan(dx1)) call abort
+    if (ieee_is_negative(dx1)) call abort
+    if (.not. ieee_is_normal(dx1)) call abort
+    if (dx1 /= 0) call abort
+
+    dx1 = ieee_value(dx1, ieee_negative_zero)
+    if (.not. ieee_is_finite(dx1)) call abort
+    if (ieee_is_nan(dx1)) call abort
+    if (.not. ieee_is_negative(dx1)) call abort
+    if (.not. ieee_is_normal(dx1)) call abort
+    if (dx1 /= 0) call abort
+
+  end if
+
+end

gcc/testsuite/gfortran.dg/ieee/ieee_5.f90

@@ -0,0 +1,34 @@
+! { dg-do run }
+
+  use :: ieee_arithmetic
+  implicit none
+
+  logical mode
+
+  ! Test IEEE_SET_UNDERFLOW_MODE, IEEE_GET_UNDERFLOW_MODE,
+  ! and IEEE_SUPPORT_UNDERFLOW_CONTROL
+  !
+  ! We don't have any targets where this is supported yet, so
+  ! we just check these subroutines are present.
+
+  if (ieee_support_underflow_control() &
+      .or. ieee_support_underflow_control(0.)) then
+
+    call ieee_get_underflow_mode(mode)
+    call ieee_set_underflow_mode(.false.)
+    call ieee_set_underflow_mode(.true.)
+    call ieee_set_underflow_mode(mode)
+
+  end if
+
+  if (ieee_support_underflow_control() &
+      .or. ieee_support_underflow_control(0.d0)) then
+
+    call ieee_get_underflow_mode(mode)
+    call ieee_set_underflow_mode(.false.)
+    call ieee_set_underflow_mode(.true.)
+    call ieee_set_underflow_mode(mode)
+
+  end if
+
+end

gcc/testsuite/gfortran.dg/ieee/ieee_6.f90

@@ -0,0 +1,78 @@
+! { dg-do run }
+!
+! This test will fail on older x86_64 glibc (< 2.20), due to this bug:
+! https://sourceware.org/bugzilla/show_bug.cgi?id=16198
+! We usually won't see it anyway, because on such systems x86_64 assembly
+! (libgfortran/config/fpu-387.h) is used.
+!
+  use :: ieee_arithmetic
+  implicit none
+
+  type(ieee_status_type) :: s1, s2
+  logical :: flags(5), halt(5)
+  type(ieee_round_type) :: mode
+  real :: x
+
+  ! Test IEEE_GET_STATUS and IEEE_SET_STATUS
+
+  call ieee_set_flag(ieee_all, .false.)
+  call ieee_set_rounding_mode(ieee_down)
+  call ieee_set_halting_mode(ieee_all, .false.)
+
+  call ieee_get_status(s1)
+  call ieee_set_status(s1)
+
+  call ieee_get_flag(ieee_all, flags)
+  if (any(flags)) call abort
+  call ieee_get_rounding_mode(mode)
+  if (mode /= ieee_down) call abort
+  call ieee_get_halting_mode(ieee_all, halt)
+  if (any(halt)) call abort
+
+  call ieee_set_rounding_mode(ieee_to_zero)
+  call ieee_set_flag(ieee_underflow, .true.)
+  call ieee_set_halting_mode(ieee_overflow, .true.)
+  x = -1
+  x = sqrt(x)
+  if (.not. ieee_is_nan(x)) call abort
+
+  call ieee_get_status(s2)
+
+  call ieee_get_flag(ieee_all, flags)
+  if (.not. (all(flags .eqv. [.false.,.false.,.true.,.true.,.false.]) &
+             .or. all(flags .eqv. [.false.,.false.,.true.,.false.,.false.]))) call abort
+  call ieee_get_rounding_mode(mode)
+  if (mode /= ieee_to_zero) call abort
+  call ieee_get_halting_mode(ieee_all, halt)
+  if ((.not. halt(1)) .or. any(halt(2:))) call abort
+
+  call ieee_set_status(s2)
+
+  call ieee_get_flag(ieee_all, flags)
+  if (.not. (all(flags .eqv. [.false.,.false.,.true.,.true.,.false.]) &
+             .or. all(flags .eqv. [.false.,.false.,.true.,.false.,.false.]))) call abort
+  call ieee_get_rounding_mode(mode)
+  if (mode /= ieee_to_zero) call abort
+  call ieee_get_halting_mode(ieee_all, halt)
+  if ((.not. halt(1)) .or. any(halt(2:))) call abort
+
+  call ieee_set_status(s1)
+
+  call ieee_get_flag(ieee_all, flags)
+  if (any(flags)) call abort
+  call ieee_get_rounding_mode(mode)
+  if (mode /= ieee_down) call abort
+  call ieee_get_halting_mode(ieee_all, halt)
+  if (any(halt)) call abort
+
+  call ieee_set_status(s2)
+
+  call ieee_get_flag(ieee_all, flags)
+  if (.not. (all(flags .eqv. [.false.,.false.,.true.,.true.,.false.]) &
+             .or. all(flags .eqv. [.false.,.false.,.true.,.false.,.false.]))) call abort
+  call ieee_get_rounding_mode(mode)
+  if (mode /= ieee_to_zero) call abort
+  call ieee_get_halting_mode(ieee_all, halt)
+  if ((.not. halt(1)) .or. any(halt(2:))) call abort
+
+end

gcc/testsuite/gfortran.dg/ieee/ieee_7.f90

@@ -0,0 +1,34 @@
+! { dg-do run }
+
+  use :: ieee_arithmetic
+  implicit none
+
+  ! Test IEEE_SELECTED_REAL_KIND in specification expressions
+
+  integer(kind=ieee_selected_real_kind()) :: i1
+  integer(kind=ieee_selected_real_kind(10)) :: i2
+  integer(kind=ieee_selected_real_kind(10,10)) :: i3
+  integer(kind=ieee_selected_real_kind(10,10,2)) :: i4
+
+  ! Test IEEE_SELECTED_REAL_KIND
+
+  if (ieee_support_datatype(0.)) then
+    if (ieee_selected_real_kind() /= kind(0.)) call abort
+    if (ieee_selected_real_kind(0) /= kind(0.)) call abort
+    if (ieee_selected_real_kind(0,0) /= kind(0.)) call abort
+    if (ieee_selected_real_kind(0,0,2) /= kind(0.)) call abort
+  end if
+
+  if (ieee_support_datatype(0.d0)) then
+    if (ieee_selected_real_kind(precision(0.)+1) /= kind(0.d0)) call abort
+    if (ieee_selected_real_kind(precision(0.),range(0.)+1) /= kind(0.d0)) call abort
+    if (ieee_selected_real_kind(precision(0.)+1,range(0.)+1) /= kind(0.d0)) call abort
+    if (ieee_selected_real_kind(precision(0.)+1,range(0.)+1,2) /= kind(0.d0)) call abort
+  end if
+
+  if (ieee_selected_real_kind(0,0,3) /= -5) call abort
+  if (ieee_selected_real_kind(precision(0.d0)+1) /= -1) call abort
+  if (ieee_selected_real_kind(0,range(0.d0)+1) /= -2) call abort
+  if (ieee_selected_real_kind(precision(0.d0)+1,range(0.d0)+1) /= -3) call abort
+
+end

gcc/testsuite/gfortran.dg/ieee/ieee_rounding_1.f90

@@ -0,0 +1,151 @@
+! { dg-do run }
+
+  use, intrinsic :: ieee_features, only : ieee_rounding
+  use, intrinsic :: ieee_arithmetic
+  implicit none
+
+  interface check_equal
+    procedure check_equal_float, check_equal_double
+  end interface
+
+  interface check_not_equal
+    procedure check_not_equal_float, check_not_equal_double
+  end interface
+
+  interface divide
+    procedure divide_float, divide_double
+  end interface
+
+  real :: sx1, sx2, sx3
+  double precision :: dx1, dx2, dx3
+  type(ieee_round_type) :: mode
+
+  ! We should support at least C float and C double types
+  if (ieee_support_rounding(ieee_nearest)) then
+    if (.not. ieee_support_rounding(ieee_nearest, 0.)) call abort
+    if (.not. ieee_support_rounding(ieee_nearest, 0.d0)) call abort
+  end if
+
+  ! The initial rounding mode should probably be NEAREST
+  ! (at least on the platforms we currently support)
+  if (ieee_support_rounding(ieee_nearest, 0.)) then
+    call ieee_get_rounding_mode (mode)
+    if (mode /= ieee_nearest) call abort
+  end if
+
+
+  if (ieee_support_rounding(ieee_up, sx1) .and. &
+      ieee_support_rounding(ieee_down, sx1) .and. &
+      ieee_support_rounding(ieee_nearest, sx1) .and. &
+      ieee_support_rounding(ieee_to_zero, sx1)) then
+
+    sx1 = 1
+    sx2 = 3
+    sx1 = divide(sx1, sx2, ieee_up)
+
+    sx3 = 1
+    sx2 = 3
+    sx3 = divide(sx3, sx2, ieee_down)
+    call check_not_equal(sx1, sx3)
+    call check_equal(sx3, nearest(sx1, -1.))
+    call check_equal(sx1, nearest(sx3,  1.))
+
+    call check_equal(1./3., divide(1., 3., ieee_nearest))
+    call check_equal(-1./3., divide(-1., 3., ieee_nearest))
+
+    call check_equal(divide(3., 7., ieee_to_zero), &
+                    divide(3., 7., ieee_down))
+    call check_equal(divide(-3., 7., ieee_to_zero), &
+                    divide(-3., 7., ieee_up))
+
+  end if
+
+  if (ieee_support_rounding(ieee_up, dx1) .and. &
+      ieee_support_rounding(ieee_down, dx1) .and. &
+      ieee_support_rounding(ieee_nearest, dx1) .and. &
+      ieee_support_rounding(ieee_to_zero, dx1)) then
+
+    dx1 = 1
+    dx2 = 3
+    dx1 = divide(dx1, dx2, ieee_up)
+
+    dx3 = 1
+    dx2 = 3
+    dx3 = divide(dx3, dx2, ieee_down)
+    call check_not_equal(dx1, dx3)
+    call check_equal(dx3, nearest(dx1, -1.d0))
+    call check_equal(dx1, nearest(dx3,  1.d0))
+
+    call check_equal(1.d0/3.d0, divide(1.d0, 3.d0, ieee_nearest))
+    call check_equal(-1.d0/3.d0, divide(-1.d0, 3.d0, ieee_nearest))
+
+    call check_equal(divide(3.d0, 7.d0, ieee_to_zero), &
+                    divide(3.d0, 7.d0, ieee_down))
+    call check_equal(divide(-3.d0, 7.d0, ieee_to_zero), &
+                    divide(-3.d0, 7.d0, ieee_up))
+
+  end if
+
+contains
+
+  real function divide_float (x, y, rounding) result(res)
+    use, intrinsic :: ieee_arithmetic
+    real, intent(in) :: x, y
+    type(ieee_round_type), intent(in) :: rounding
+    type(ieee_round_type) :: old
+
+    call ieee_get_rounding_mode (old)
+    call ieee_set_rounding_mode (rounding)
+
+    res = x / y
+
+    call ieee_set_rounding_mode (old)
+  end function
+
+  double precision function divide_double (x, y, rounding) result(res)
+    use, intrinsic :: ieee_arithmetic
+    double precision, intent(in) :: x, y
+    type(ieee_round_type), intent(in) :: rounding
+    type(ieee_round_type) :: old
+
+    call ieee_get_rounding_mode (old)
+    call ieee_set_rounding_mode (rounding)
+
+    res = x / y
+
+    call ieee_set_rounding_mode (old)
+  end function
+
+  subroutine check_equal_float (x, y)
+    real, intent(in) :: x, y
+    if (x /= y) then
+      print *, x, y
+      call abort
+    end if
+  end subroutine
+
+  subroutine check_equal_double (x, y)
+    double precision, intent(in) :: x, y
+    if (x /= y) then
+      print *, x, y
+      call abort
+    end if
+  end subroutine
+
+  subroutine check_not_equal_float (x, y)
+    real, intent(in) :: x, y
+    if (x == y) then
+      print *, x, y
+      call abort
+    end if
+  end subroutine
+
+  subroutine check_not_equal_double (x, y)
+    double precision, intent(in) :: x, y
+    if (x == y) then
+      print *, x, y
+      call abort
+    end if
+  end subroutine
+
+end

gcc/testsuite/lib/target-supports.exp

@@ -1110,6 +1110,20 @@ proc check_effective_target_fortran_real_16 { } {
 }
 
 
+# Return 1 if the target supports Fortran's IEEE modules,
+# 0 otherwise.
+#
+# When the target name changes, replace the cached result.
+
+proc check_effective_target_fortran_ieee { flags } {
+    return [check_no_compiler_messages fortran_ieee executable {
+	! Fortran
+	use, intrinsic :: ieee_features
+	end
+    } $flags ]
+}
+
+
 # Return 1 if the target supports SQRT for the largest floating-point
 # type. (Some targets lack the libm support for this FP type.)
 # On most targets, this check effectively checks either whether sqrtl is

libgfortran/ChangeLog

@@ -1,3 +1,26 @@
+2014-06-28  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
+
+	PR fortran/29383
+	* configure.host: Add checks for IEEE support, rework priorities.
+	* configure.ac: Define IEEE_SUPPORT, check for fpsetsticky and
+	fpresetsticky.
+	* configure: Regenerate.
+	* Makefile.am: Build new ieee files, install IEEE_* modules.
+	* Makefile.in: Regenerate.
+	* gfortran.map (GFORTRAN_1.6): Add new symbols.
+	* libgfortran.h (get_fpu_trap_exceptions, set_fpu_trap_exceptions,
+	support_fpu_trap, set_fpu_except_flags, support_fpu_flag,
+	support_fpu_rounding_mode, get_fpu_state, set_fpu_state): New
+	prototypes.
+	* config/fpu-*.h (get_fpu_trap_exceptions,
+	set_fpu_trap_exceptions, support_fpu_trap, set_fpu_except_flags,
+	support_fpu_flag, support_fpu_rounding_mode, get_fpu_state,
+	set_fpu_state): New functions.
+	* ieee/ieee_features.F90: New file.
+	* ieee/ieee_exceptions.F90: New file.
+	* ieee/ieee_arithmetic.F90: New file.
+	* ieee/ieee_helper.c: New file.
+
 2014-06-26  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	PR libgfortran/61499

libgfortran/Makefile.am

@@ -54,6 +54,11 @@ libcaf_single_la_LDFLAGS = -static
 libcaf_single_la_DEPENDENCIES = caf/libcaf.h
 libcaf_single_la_LINK = $(LINK) $(libcaf_single_la_LDFLAGS)
 
+if IEEE_SUPPORT
+fincludedir = $(libdir)/gcc/$(target_alias)/$(gcc_version)$(MULTISUBDIR)/finclude
+nodist_finclude_HEADERS = ieee_arithmetic.mod ieee_exceptions.mod ieee_features.mod
+endif
+
 ## io.h conflicts with a system header on some platforms, so
 ## use -iquote
 AM_CPPFLAGS = -iquote$(srcdir)/io -I$(srcdir)/$(MULTISRCTOP)../gcc \
@@ -70,6 +75,7 @@ AM_CFLAGS += $(SECTION_FLAGS)
 
 # Some targets require additional compiler options for IEEE compatibility.
 AM_CFLAGS += $(IEEE_FLAGS)
+AM_FCFLAGS += $(IEEE_FLAGS)
 
 gfor_io_src= \
 io/close.c \
@@ -160,6 +166,21 @@ intrinsics/unpack_generic.c \
 runtime/in_pack_generic.c \
 runtime/in_unpack_generic.c
 
+if IEEE_SUPPORT
+
+gfor_helper_src+=ieee/ieee_helper.c
+
+gfor_ieee_src= \
+ieee/ieee_arithmetic.F90 \
+ieee/ieee_exceptions.F90 \
+ieee/ieee_features.F90
+
+else
+
+gfor_ieee_src=
+
+endif
+
 gfor_src= \
 runtime/backtrace.c \
 runtime/bounds.c \
@@ -650,7 +671,7 @@ gfor_built_src= $(i_all_c) $(i_any_c) $(i_count_c) $(i_maxloc0_c) \
     $(i_exponent_c) $(i_fraction_c) $(i_nearest_c) $(i_set_exponent_c) \
     $(i_pow_c) $(i_rrspacing_c) $(i_spacing_c) $(i_pack_c) $(i_unpack_c) \
     $(i_spread_c) selected_int_kind.inc selected_real_kind.inc kinds.h \
-    $(i_cshift0_c) kinds.inc c99_protos.inc fpu-target.h
+    $(i_cshift0_c) kinds.inc c99_protos.inc fpu-target.h fpu-target.inc
 
 # Machine generated specifics
 gfor_built_specific_src= \
@@ -811,11 +832,27 @@ $(patsubst %.c,%.lo,$(notdir $(i_matmull_c))): AM_CFLAGS += -funroll-loops
 $(patsubst %.F90,%.lo,$(patsubst %.f90,%.lo,$(notdir $(gfor_specific_src)))): AM_FCFLAGS += -fallow-leading-underscore
 selected_real_kind.lo selected_int_kind.lo: AM_FCFLAGS += -fallow-leading-underscore
 
+if IEEE_SUPPORT
+# Add flags for IEEE modules
+$(patsubst %.F90,%.lo,$(notdir $(gfor_ieee_src))): AM_FCFLAGS += -Wno-unused-dummy-argument -Wno-c-binding-type -ffree-line-length-0 -fallow-leading-underscore
+endif
+
+# Dependencies between IEEE_ARITHMETIC and IEEE_EXCEPTIONS
+ieee_arithmetic.lo: ieee/ieee_arithmetic.F90 ieee_exceptions.lo
+	$(LTPPFCCOMPILE) -c -o $@ $<
+
+ieee_features.mod: ieee_features.lo
+	:
+ieee_exceptions.mod: ieee_exceptions.lo
+	:
+ieee_arithmetic.mod: ieee_arithmetic.lo
+	:
+
 BUILT_SOURCES=$(gfor_built_src) $(gfor_built_specific_src) \
     $(gfor_built_specific2_src) $(gfor_misc_specifics)
 
 prereq_SRC = $(gfor_src) $(gfor_built_src) $(gfor_io_src) \
-    $(gfor_helper_src) $(gfor_io_headers) $(gfor_specific_src)
+    $(gfor_helper_src) $(gfor_ieee_src) $(gfor_io_headers) $(gfor_specific_src)
 
 if onestep
 # dummy sources for libtool
@@ -871,6 +908,10 @@ selected_real_kind.inc: $(srcdir)/mk-srk-inc.sh
 fpu-target.h: $(srcdir)/$(FPU_HOST_HEADER)
 	cp $(srcdir)/$(FPU_HOST_HEADER) $@
 
+fpu-target.inc: fpu-target.h $(srcdir)/libgfortran.h
+	grep '^#define GFC_FPE_' < $(top_srcdir)/../gcc/fortran/libgfortran.h > $@ || true
+	grep '^#define GFC_FPE_' < $(srcdir)/libgfortran.h >> $@ || true
+
 ## A 'normal' build shouldn't need to regenerate these
 ## so we only include them in maintainer mode
 

libgfortran/Makefile.in

@@ -16,6 +16,7 @@
 @SET_MAKE@
 
 
+
 VPATH = @srcdir@
 pkgdatadir = $(datadir)/@PACKAGE@
 pkgincludedir = $(includedir)/@PACKAGE@
@@ -36,9 +37,10 @@ POST_UNINSTALL = :
 build_triplet = @build@
 host_triplet = @host@
 target_triplet = @target@
+@IEEE_SUPPORT_TRUE@am__append_1 = ieee/ieee_helper.c
 
 # dummy sources for libtool
-@onestep_TRUE@am__append_1 = libgfortran_c.c libgfortran_f.f90
+@onestep_TRUE@am__append_2 = libgfortran_c.c libgfortran_f.f90
 subdir = .
 DIST_COMMON = ChangeLog $(srcdir)/Makefile.in $(srcdir)/Makefile.am \
 	$(top_srcdir)/configure $(am__configure_deps) \
@@ -95,7 +97,7 @@ am__uninstall_files_from_dir = { \
   }
 am__installdirs = "$(DESTDIR)$(cafexeclibdir)" \
 	"$(DESTDIR)$(myexeclibdir)" "$(DESTDIR)$(toolexeclibdir)" \
-	"$(DESTDIR)$(toolexeclibdir)"
+	"$(DESTDIR)$(toolexeclibdir)" "$(DESTDIR)$(fincludedir)"
 LTLIBRARIES = $(cafexeclib_LTLIBRARIES) $(myexeclib_LTLIBRARIES) \
 	$(toolexeclib_LTLIBRARIES)
 libcaf_single_la_LIBADD =
@@ -245,7 +247,8 @@ am__objects_41 = close.lo file_pos.lo format.lo inquire.lo \
 	intrinsics.lo list_read.lo lock.lo open.lo read.lo \
 	size_from_kind.lo transfer.lo transfer128.lo unit.lo unix.lo \
 	write.lo fbuf.lo
-am__objects_42 = associated.lo abort.lo access.lo args.lo \
+@IEEE_SUPPORT_TRUE@am__objects_42 = ieee_helper.lo
+am__objects_43 = associated.lo abort.lo access.lo args.lo \
 	bit_intrinsics.lo c99_functions.lo chdir.lo chmod.lo clock.lo \
 	cpu_time.lo cshift0.lo ctime.lo date_and_time.lo dtime.lo \
 	env.lo eoshift0.lo eoshift2.lo erfc_scaled.lo etime.lo \
@@ -259,9 +262,11 @@ am__objects_42 = associated.lo abort.lo access.lo args.lo \
 	selected_int_kind.lo selected_real_kind.lo stat.lo symlnk.lo \
 	system_clock.lo time.lo transpose_generic.lo umask.lo \
 	unlink.lo unpack_generic.lo in_pack_generic.lo \
-	in_unpack_generic.lo
+	in_unpack_generic.lo $(am__objects_42)
-am__objects_43 =
+@IEEE_SUPPORT_TRUE@am__objects_44 = ieee_arithmetic.lo \
-am__objects_44 = _abs_c4.lo _abs_c8.lo _abs_c10.lo _abs_c16.lo \
+@IEEE_SUPPORT_TRUE@	ieee_exceptions.lo ieee_features.lo
+am__objects_45 =
+am__objects_46 = _abs_c4.lo _abs_c8.lo _abs_c10.lo _abs_c16.lo \
 	_abs_i4.lo _abs_i8.lo _abs_i16.lo _abs_r4.lo _abs_r8.lo \
 	_abs_r10.lo _abs_r16.lo _aimag_c4.lo _aimag_c8.lo \
 	_aimag_c10.lo _aimag_c16.lo _exp_r4.lo _exp_r8.lo _exp_r10.lo \
@@ -285,18 +290,19 @@ am__objects_44 = _abs_c4.lo _abs_c8.lo _abs_c10.lo _abs_c16.lo \
 	_conjg_c4.lo _conjg_c8.lo _conjg_c10.lo _conjg_c16.lo \
 	_aint_r4.lo _aint_r8.lo _aint_r10.lo _aint_r16.lo _anint_r4.lo \
 	_anint_r8.lo _anint_r10.lo _anint_r16.lo
-am__objects_45 = _sign_i4.lo _sign_i8.lo _sign_i16.lo _sign_r4.lo \
+am__objects_47 = _sign_i4.lo _sign_i8.lo _sign_i16.lo _sign_r4.lo \
 	_sign_r8.lo _sign_r10.lo _sign_r16.lo _dim_i4.lo _dim_i8.lo \
 	_dim_i16.lo _dim_r4.lo _dim_r8.lo _dim_r10.lo _dim_r16.lo \
 	_atan2_r4.lo _atan2_r8.lo _atan2_r10.lo _atan2_r16.lo \
 	_mod_i4.lo _mod_i8.lo _mod_i16.lo _mod_r4.lo _mod_r8.lo \
 	_mod_r10.lo _mod_r16.lo
-am__objects_46 = misc_specifics.lo
+am__objects_48 = misc_specifics.lo
-am__objects_47 = $(am__objects_44) $(am__objects_45) $(am__objects_46) \
+am__objects_49 = $(am__objects_46) $(am__objects_47) $(am__objects_48) \
 	dprod_r8.lo f2c_specifics.lo
-am__objects_48 = $(am__objects_1) $(am__objects_40) $(am__objects_41) \
+am__objects_50 = $(am__objects_1) $(am__objects_40) $(am__objects_41) \
-	$(am__objects_42) $(am__objects_43) $(am__objects_47)
+	$(am__objects_43) $(am__objects_44) $(am__objects_45) \
-@onestep_FALSE@am_libgfortran_la_OBJECTS = $(am__objects_48)
+	$(am__objects_49)
+@onestep_FALSE@am_libgfortran_la_OBJECTS = $(am__objects_50)
 @onestep_TRUE@am_libgfortran_la_OBJECTS = libgfortran_c.lo
 libgfortran_la_OBJECTS = $(am_libgfortran_la_OBJECTS)
 libgfortranbegin_la_LIBADD =
@@ -336,6 +342,7 @@ MULTISUBDIR =
 MULTIDO = true
 MULTICLEAN = true
 DATA = $(toolexeclib_DATA)
+HEADERS = $(nodist_finclude_HEADERS)
 ETAGS = etags
 CTAGS = ctags
 ACLOCAL = @ACLOCAL@
@@ -348,7 +355,7 @@ AMTAR = @AMTAR@
 # Some targets require additional compiler options for IEEE compatibility.
 AM_CFLAGS = @AM_CFLAGS@ -fcx-fortran-rules $(SECTION_FLAGS) \
 	$(IEEE_FLAGS)
-AM_FCFLAGS = @AM_FCFLAGS@
+AM_FCFLAGS = @AM_FCFLAGS@ $(IEEE_FLAGS)
 AR = @AR@
 AS = @AS@
 AUTOCONF = @AUTOCONF@
@@ -376,6 +383,7 @@ FGREP = @FGREP@
 FPU_HOST_HEADER = @FPU_HOST_HEADER@
 GREP = @GREP@
 IEEE_FLAGS = @IEEE_FLAGS@
+IEEE_SUPPORT = @IEEE_SUPPORT@
 INSTALL = @INSTALL@
 INSTALL_DATA = @INSTALL_DATA@
 INSTALL_PROGRAM = @INSTALL_PROGRAM@
@@ -516,6 +524,8 @@ libcaf_single_la_SOURCES = caf/single.c
 libcaf_single_la_LDFLAGS = -static
 libcaf_single_la_DEPENDENCIES = caf/libcaf.h
 libcaf_single_la_LINK = $(LINK) $(libcaf_single_la_LDFLAGS)
+@IEEE_SUPPORT_TRUE@fincludedir = $(libdir)/gcc/$(target_alias)/$(gcc_version)$(MULTISUBDIR)/finclude
+@IEEE_SUPPORT_TRUE@nodist_finclude_HEADERS = ieee_arithmetic.mod ieee_exceptions.mod ieee_features.mod
 AM_CPPFLAGS = -iquote$(srcdir)/io -I$(srcdir)/$(MULTISRCTOP)../gcc \
 	      -I$(srcdir)/$(MULTISRCTOP)../gcc/config $(LIBQUADINCLUDE) \
 	      -I$(MULTIBUILDTOP)../../$(host_subdir)/gcc \
@@ -546,70 +556,39 @@ io/fbuf.h \
 io/format.h \
 io/unix.h
 
-gfor_helper_src = \
+gfor_helper_src = intrinsics/associated.c intrinsics/abort.c \
-intrinsics/associated.c \
+	intrinsics/access.c intrinsics/args.c \
-intrinsics/abort.c \
+	intrinsics/bit_intrinsics.c intrinsics/c99_functions.c \
-intrinsics/access.c \
+	intrinsics/chdir.c intrinsics/chmod.c intrinsics/clock.c \
-intrinsics/args.c \
+	intrinsics/cpu_time.c intrinsics/cshift0.c intrinsics/ctime.c \
-intrinsics/bit_intrinsics.c \
+	intrinsics/date_and_time.c intrinsics/dtime.c intrinsics/env.c \
-intrinsics/c99_functions.c \
+	intrinsics/eoshift0.c intrinsics/eoshift2.c \
-intrinsics/chdir.c \
+	intrinsics/erfc_scaled.c intrinsics/etime.c \
-intrinsics/chmod.c \
+	intrinsics/execute_command_line.c intrinsics/exit.c \
-intrinsics/clock.c \
+	intrinsics/extends_type_of.c intrinsics/fnum.c \
-intrinsics/cpu_time.c \
+	intrinsics/gerror.c intrinsics/getcwd.c intrinsics/getlog.c \
-intrinsics/cshift0.c \
+	intrinsics/getXid.c intrinsics/hostnm.c intrinsics/ierrno.c \
-intrinsics/ctime.c \
+	intrinsics/ishftc.c intrinsics/iso_c_generated_procs.c \
-intrinsics/date_and_time.c \
+	intrinsics/iso_c_binding.c intrinsics/kill.c intrinsics/link.c \
-intrinsics/dtime.c \
+	intrinsics/malloc.c intrinsics/mvbits.c \
-intrinsics/env.c \
+	intrinsics/move_alloc.c intrinsics/pack_generic.c \
-intrinsics/eoshift0.c \
+	intrinsics/perror.c intrinsics/selected_char_kind.c \
-intrinsics/eoshift2.c \
+	intrinsics/signal.c intrinsics/size.c intrinsics/sleep.c \
-intrinsics/erfc_scaled.c \
+	intrinsics/spread_generic.c intrinsics/string_intrinsics.c \
-intrinsics/etime.c \
+	intrinsics/system.c intrinsics/rand.c intrinsics/random.c \
-intrinsics/execute_command_line.c \
+	intrinsics/rename.c intrinsics/reshape_generic.c \
-intrinsics/exit.c \
+	intrinsics/reshape_packed.c intrinsics/selected_int_kind.f90 \
-intrinsics/extends_type_of.c \
+	intrinsics/selected_real_kind.f90 intrinsics/stat.c \
-intrinsics/fnum.c \
+	intrinsics/symlnk.c intrinsics/system_clock.c \
-intrinsics/gerror.c \
+	intrinsics/time.c intrinsics/transpose_generic.c \
-intrinsics/getcwd.c \
+	intrinsics/umask.c intrinsics/unlink.c \
-intrinsics/getlog.c \
+	intrinsics/unpack_generic.c runtime/in_pack_generic.c \
-intrinsics/getXid.c \
+	runtime/in_unpack_generic.c $(am__append_1)
-intrinsics/hostnm.c \
+@IEEE_SUPPORT_FALSE@gfor_ieee_src = 
-intrinsics/ierrno.c \
+@IEEE_SUPPORT_TRUE@gfor_ieee_src = \
-intrinsics/ishftc.c \
+@IEEE_SUPPORT_TRUE@ieee/ieee_arithmetic.F90 \
-intrinsics/iso_c_generated_procs.c \
+@IEEE_SUPPORT_TRUE@ieee/ieee_exceptions.F90 \
-intrinsics/iso_c_binding.c \
+@IEEE_SUPPORT_TRUE@ieee/ieee_features.F90
-intrinsics/kill.c \
-intrinsics/link.c \
-intrinsics/malloc.c \
-intrinsics/mvbits.c \
-intrinsics/move_alloc.c \
-intrinsics/pack_generic.c \
-intrinsics/perror.c \
-intrinsics/selected_char_kind.c \
-intrinsics/signal.c \
-intrinsics/size.c \
-intrinsics/sleep.c \
-intrinsics/spread_generic.c \
-intrinsics/string_intrinsics.c \
-intrinsics/system.c \
-intrinsics/rand.c \
-intrinsics/random.c \
-intrinsics/rename.c \
-intrinsics/reshape_generic.c \
-intrinsics/reshape_packed.c \
-intrinsics/selected_int_kind.f90 \
-intrinsics/selected_real_kind.f90 \
-intrinsics/stat.c \
-intrinsics/symlnk.c \
-intrinsics/system_clock.c \
-intrinsics/time.c \
-intrinsics/transpose_generic.c \
-intrinsics/umask.c \
-intrinsics/unlink.c \
-intrinsics/unpack_generic.c \
-runtime/in_pack_generic.c \
-runtime/in_unpack_generic.c
 
 gfor_src = \
 runtime/backtrace.c \
@@ -1100,7 +1079,7 @@ gfor_built_src = $(i_all_c) $(i_any_c) $(i_count_c) $(i_maxloc0_c) \
     $(i_exponent_c) $(i_fraction_c) $(i_nearest_c) $(i_set_exponent_c) \
     $(i_pow_c) $(i_rrspacing_c) $(i_spacing_c) $(i_pack_c) $(i_unpack_c) \
     $(i_spread_c) selected_int_kind.inc selected_real_kind.inc kinds.h \
-    $(i_cshift0_c) kinds.inc c99_protos.inc fpu-target.h
+    $(i_cshift0_c) kinds.inc c99_protos.inc fpu-target.h fpu-target.inc
 
 
 # Machine generated specifics
@@ -1254,9 +1233,9 @@ intrinsics/f2c_specifics.F90
 
 BUILT_SOURCES = $(gfor_built_src) $(gfor_built_specific_src) \
 	$(gfor_built_specific2_src) $(gfor_misc_specifics) \
-	$(am__append_1)
+	$(am__append_2)
 prereq_SRC = $(gfor_src) $(gfor_built_src) $(gfor_io_src) \
-    $(gfor_helper_src) $(gfor_io_headers) $(gfor_specific_src)
+    $(gfor_helper_src) $(gfor_ieee_src) $(gfor_io_headers) $(gfor_specific_src)
 
 @onestep_FALSE@libgfortran_la_SOURCES = $(prereq_SRC)
 
@@ -1538,6 +1517,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/iany_i2.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/iany_i4.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/iany_i8.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ieee_helper.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ierrno.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/in_pack_c10.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/in_pack_c16.Plo@am__quote@
@@ -1919,6 +1899,12 @@ distclean-compile:
 .F90.lo:
 	$(LTPPFCCOMPILE) -c -o $@ $<
 
+ieee_exceptions.lo: ieee/ieee_exceptions.F90
+	$(LIBTOOL)  --tag=FC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(FC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_FCFLAGS) $(FCFLAGS) -c -o ieee_exceptions.lo `test -f 'ieee/ieee_exceptions.F90' || echo '$(srcdir)/'`ieee/ieee_exceptions.F90
+
+ieee_features.lo: ieee/ieee_features.F90
+	$(LIBTOOL)  --tag=FC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(FC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_FCFLAGS) $(FCFLAGS) -c -o ieee_features.lo `test -f 'ieee/ieee_features.F90' || echo '$(srcdir)/'`ieee/ieee_features.F90
+
 _abs_c4.lo: $(srcdir)/generated/_abs_c4.F90
 	$(LIBTOOL)  --tag=FC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(FC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_FCFLAGS) $(FCFLAGS) -c -o _abs_c4.lo `test -f '$(srcdir)/generated/_abs_c4.F90' || echo '$(srcdir)/'`$(srcdir)/generated/_abs_c4.F90
 
@@ -5630,6 +5616,13 @@ in_unpack_generic.lo: runtime/in_unpack_generic.c
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o in_unpack_generic.lo `test -f 'runtime/in_unpack_generic.c' || echo '$(srcdir)/'`runtime/in_unpack_generic.c
 
+ieee_helper.lo: ieee/ieee_helper.c
+@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ieee_helper.lo -MD -MP -MF $(DEPDIR)/ieee_helper.Tpo -c -o ieee_helper.lo `test -f 'ieee/ieee_helper.c' || echo '$(srcdir)/'`ieee/ieee_helper.c
+@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/ieee_helper.Tpo $(DEPDIR)/ieee_helper.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='ieee/ieee_helper.c' object='ieee_helper.lo' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ieee_helper.lo `test -f 'ieee/ieee_helper.c' || echo '$(srcdir)/'`ieee/ieee_helper.c
+
 .f90.o:
 	$(FCCOMPILE) -c -o $@ $<
 
@@ -5691,6 +5684,24 @@ uninstall-toolexeclibDATA:
 	@list='$(toolexeclib_DATA)'; test -n "$(toolexeclibdir)" || list=; \
 	files=`for p in $$list; do echo $$p; done | sed -e 's|^.*/||'`; \
 	dir='$(DESTDIR)$(toolexeclibdir)'; $(am__uninstall_files_from_dir)
+install-nodist_fincludeHEADERS: $(nodist_finclude_HEADERS)
+	@$(NORMAL_INSTALL)
+	test -z "$(fincludedir)" || $(MKDIR_P) "$(DESTDIR)$(fincludedir)"
+	@list='$(nodist_finclude_HEADERS)'; test -n "$(fincludedir)" || list=; \
+	for p in $$list; do \
+	  if test -f "$$p"; then d=; else d="$(srcdir)/"; fi; \
+	  echo "$$d$$p"; \
+	done | $(am__base_list) | \
+	while read files; do \
+	  echo " $(INSTALL_HEADER) $$files '$(DESTDIR)$(fincludedir)'"; \
+	  $(INSTALL_HEADER) $$files "$(DESTDIR)$(fincludedir)" || exit $$?; \
+	done
+
+uninstall-nodist_fincludeHEADERS:
+	@$(NORMAL_UNINSTALL)
+	@list='$(nodist_finclude_HEADERS)'; test -n "$(fincludedir)" || list=; \
+	files=`for p in $$list; do echo $$p; done | sed -e 's|^.*/||'`; \
+	dir='$(DESTDIR)$(fincludedir)'; $(am__uninstall_files_from_dir)
 
 ID: $(HEADERS) $(SOURCES) $(LISP) $(TAGS_FILES)
 	list='$(SOURCES) $(HEADERS) $(LISP) $(TAGS_FILES)'; \
@@ -5746,9 +5757,9 @@ distclean-tags:
 check-am: all-am
 check: $(BUILT_SOURCES)
 	$(MAKE) $(AM_MAKEFLAGS) check-am
-all-am: Makefile $(LTLIBRARIES) all-multi $(DATA) config.h
+all-am: Makefile $(LTLIBRARIES) all-multi $(DATA) $(HEADERS) config.h
 installdirs:
-	for dir in "$(DESTDIR)$(cafexeclibdir)" "$(DESTDIR)$(myexeclibdir)" "$(DESTDIR)$(toolexeclibdir)" "$(DESTDIR)$(toolexeclibdir)"; do \
+	for dir in "$(DESTDIR)$(cafexeclibdir)" "$(DESTDIR)$(myexeclibdir)" "$(DESTDIR)$(toolexeclibdir)" "$(DESTDIR)$(toolexeclibdir)" "$(DESTDIR)$(fincludedir)"; do \
 	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
 	done
 install: $(BUILT_SOURCES)
@@ -5808,7 +5819,7 @@ info: info-am
 
 info-am:
 
-install-data-am:
+install-data-am: install-nodist_fincludeHEADERS
 
 install-dvi: install-dvi-am
 
@@ -5859,7 +5870,8 @@ ps: ps-am
 ps-am:
 
 uninstall-am: uninstall-cafexeclibLTLIBRARIES \
-	uninstall-myexeclibLTLIBRARIES uninstall-toolexeclibDATA \
+	uninstall-myexeclibLTLIBRARIES \
+	uninstall-nodist_fincludeHEADERS uninstall-toolexeclibDATA \
 	uninstall-toolexeclibLTLIBRARIES
 
 .MAKE: all all-multi check clean-multi distclean-multi install \
@@ -5876,15 +5888,17 @@ uninstall-am: uninstall-cafexeclibLTLIBRARIES \
 	install-data install-data-am install-dvi install-dvi-am \
 	install-exec install-exec-am install-html install-html-am \
 	install-info install-info-am install-man install-multi \
-	install-myexeclibLTLIBRARIES install-pdf install-pdf-am \
+	install-myexeclibLTLIBRARIES install-nodist_fincludeHEADERS \
-	install-ps install-ps-am install-strip install-toolexeclibDATA \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip install-toolexeclibDATA \
 	install-toolexeclibLTLIBRARIES installcheck installcheck-am \
 	installdirs maintainer-clean maintainer-clean-generic \
 	maintainer-clean-multi mostlyclean mostlyclean-compile \
 	mostlyclean-generic mostlyclean-libtool mostlyclean-multi pdf \
 	pdf-am ps ps-am tags uninstall uninstall-am \
 	uninstall-cafexeclibLTLIBRARIES uninstall-myexeclibLTLIBRARIES \
-	uninstall-toolexeclibDATA uninstall-toolexeclibLTLIBRARIES
+	uninstall-nodist_fincludeHEADERS uninstall-toolexeclibDATA \
+	uninstall-toolexeclibLTLIBRARIES
 
 @LIBGFOR_USE_SYMVER_SUN_TRUE@@LIBGFOR_USE_SYMVER_TRUE@gfortran.map-sun : $(srcdir)/gfortran.map \
 @LIBGFOR_USE_SYMVER_SUN_TRUE@@LIBGFOR_USE_SYMVER_TRUE@		$(top_srcdir)/../contrib/make_sunver.pl \
@@ -5904,6 +5918,20 @@ $(patsubst %.c,%.lo,$(notdir $(i_matmull_c))): AM_CFLAGS += -funroll-loops
 # Add the -fallow-leading-underscore option when needed
 $(patsubst %.F90,%.lo,$(patsubst %.f90,%.lo,$(notdir $(gfor_specific_src)))): AM_FCFLAGS += -fallow-leading-underscore
 selected_real_kind.lo selected_int_kind.lo: AM_FCFLAGS += -fallow-leading-underscore
+
+# Add flags for IEEE modules
+@IEEE_SUPPORT_TRUE@$(patsubst %.F90,%.lo,$(notdir $(gfor_ieee_src))): AM_FCFLAGS += -Wno-unused-dummy-argument -Wno-c-binding-type -ffree-line-length-0 -fallow-leading-underscore
+
+# Dependencies between IEEE_ARITHMETIC and IEEE_EXCEPTIONS
+ieee_arithmetic.lo: ieee/ieee_arithmetic.F90 ieee_exceptions.lo
+	$(LTPPFCCOMPILE) -c -o $@ $<
+
+ieee_features.mod: ieee_features.lo
+	:
+ieee_exceptions.mod: ieee_exceptions.lo
+	:
+ieee_arithmetic.mod: ieee_arithmetic.lo
+	:
 @onestep_TRUE@libgfortran_c.c libgfortran_f.f90 libgfortran_F.F90:
 @onestep_TRUE@	echo > $@
 # overrides for libtool perusing the dummy sources
@@ -5931,6 +5959,10 @@ selected_real_kind.inc: $(srcdir)/mk-srk-inc.sh
 fpu-target.h: $(srcdir)/$(FPU_HOST_HEADER)
 	cp $(srcdir)/$(FPU_HOST_HEADER) $@
 
+fpu-target.inc: fpu-target.h $(srcdir)/libgfortran.h
+	grep '^#define GFC_FPE_' < $(top_srcdir)/../gcc/fortran/libgfortran.h > $@ || true
+	grep '^#define GFC_FPE_' < $(srcdir)/libgfortran.h >> $@ || true
+
 @MAINTAINER_MODE_TRUE@$(i_all_c): m4/all.m4 $(I_M4_DEPS2)
 @MAINTAINER_MODE_TRUE@	$(M4) -Dfile=$@ -I$(srcdir)/m4 all.m4 > $@
 

libgfortran/config/fpu-387.h

@@ -23,6 +23,8 @@ a copy of the GCC Runtime Library Exception along with this program;
 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 <http://www.gnu.org/licenses/>.  */
 
+#include <assert.h>
+
 #ifndef __SSE_MATH__
 #include "cpuid.h"
 #endif
@@ -62,24 +64,122 @@ has_sse (void)
 
 #define _FPU_RC_MASK    0x3
 
+/* This structure corresponds to the layout of the block
+   written by FSTENV.  */
+typedef struct
+{
+  unsigned short int __control_word;
+  unsigned short int __unused1;
+  unsigned short int __status_word;
+  unsigned short int __unused2;
+  unsigned short int __tags;
+  unsigned short int __unused3;
+  unsigned int __eip;
+  unsigned short int __cs_selector;
+  unsigned int __opcode:11;
+  unsigned int __unused4:5;
+  unsigned int __data_offset;
+  unsigned short int __data_selector;
+  unsigned short int __unused5;
+  unsigned int __mxcsr;
+}
+my_fenv_t;
+
+
+/* Raise the supported floating-point exceptions from EXCEPTS.  Other
+   bits in EXCEPTS are ignored.  Code originally borrowed from
+   libatomic/config/x86/fenv.c.  */
+
+static void
+local_feraiseexcept (int excepts)
+{
+  if (excepts & _FPU_MASK_IM)
+    {
+      float f = 0.0f;
+#ifdef __SSE_MATH__
+      volatile float r __attribute__ ((unused));
+      __asm__ __volatile__ ("%vdivss\t{%0, %d0|%d0, %0}" : "+x" (f));
+      r = f; /* Needed to trigger exception.   */
+#else
+      __asm__ __volatile__ ("fdiv\t{%y0, %0|%0, %y0}" : "+t" (f));
+      /* No need for fwait, exception is triggered by emitted fstp.  */
+#endif
+    }
+  if (excepts & _FPU_MASK_DM)
+    {
+      my_fenv_t temp;
+      __asm__ __volatile__ ("fnstenv\t%0" : "=m" (temp));
+      temp.__status_word |= _FPU_MASK_DM;
+      __asm__ __volatile__ ("fldenv\t%0" : : "m" (temp));
+      __asm__ __volatile__ ("fwait");
+    }
+  if (excepts & _FPU_MASK_ZM)
+    {
+      float f = 1.0f, g = 0.0f;
+#ifdef __SSE_MATH__
+      volatile float r __attribute__ ((unused));
+      __asm__ __volatile__ ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
+      r = f; /* Needed to trigger exception.   */
+#else
+      __asm__ __volatile__ ("fdivs\t%1" : "+t" (f) : "m" (g));
+      /* No need for fwait, exception is triggered by emitted fstp.  */
+#endif
+    }
+  if (excepts & _FPU_MASK_OM)
+    {
+      my_fenv_t temp;
+      __asm__ __volatile__ ("fnstenv\t%0" : "=m" (temp));
+      temp.__status_word |= _FPU_MASK_OM;
+      __asm__ __volatile__ ("fldenv\t%0" : : "m" (temp));
+      __asm__ __volatile__ ("fwait");
+    }
+  if (excepts & _FPU_MASK_UM)
+    {
+      my_fenv_t temp;
+      __asm__ __volatile__ ("fnstenv\t%0" : "=m" (temp));
+      temp.__status_word |= _FPU_MASK_UM;
+      __asm__ __volatile__ ("fldenv\t%0" : : "m" (temp));
+      __asm__ __volatile__ ("fwait");
+    }
+  if (excepts & _FPU_MASK_PM)
+    {
+      float f = 1.0f, g = 3.0f;
+#ifdef __SSE_MATH__
+      volatile float r __attribute__ ((unused));
+      __asm__ __volatile__ ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
+      r = f; /* Needed to trigger exception.   */
+#else
+      __asm__ __volatile__ ("fdivs\t%1" : "+t" (f) : "m" (g));
+      /* No need for fwait, exception is triggered by emitted fstp.  */
+#endif
+    }
+}
+
 
 void
-set_fpu (void)
+set_fpu_trap_exceptions (int trap, int notrap)
 {
-  int excepts = 0;
+  int exc_set = 0, exc_clr = 0;
   unsigned short cw;
 
+  if (trap & GFC_FPE_INVALID) exc_set |= _FPU_MASK_IM;
+  if (trap & GFC_FPE_DENORMAL) exc_set |= _FPU_MASK_DM;
+  if (trap & GFC_FPE_ZERO) exc_set |= _FPU_MASK_ZM;
+  if (trap & GFC_FPE_OVERFLOW) exc_set |= _FPU_MASK_OM;
+  if (trap & GFC_FPE_UNDERFLOW) exc_set |= _FPU_MASK_UM;
+  if (trap & GFC_FPE_INEXACT) exc_set |= _FPU_MASK_PM;
+
+  if (notrap & GFC_FPE_INVALID) exc_clr |= _FPU_MASK_IM;
+  if (notrap & GFC_FPE_DENORMAL) exc_clr |= _FPU_MASK_DM;
+  if (notrap & GFC_FPE_ZERO) exc_clr |= _FPU_MASK_ZM;
+  if (notrap & GFC_FPE_OVERFLOW) exc_clr |= _FPU_MASK_OM;
+  if (notrap & GFC_FPE_UNDERFLOW) exc_clr |= _FPU_MASK_UM;
+  if (notrap & GFC_FPE_INEXACT) exc_clr |= _FPU_MASK_PM;
+
   __asm__ __volatile__ ("fstcw\t%0" : "=m" (cw));
 
-  if (options.fpe & GFC_FPE_INVALID) excepts |= _FPU_MASK_IM;
+  cw |= exc_clr;
-  if (options.fpe & GFC_FPE_DENORMAL) excepts |= _FPU_MASK_DM;
+  cw &= ~exc_set;
-  if (options.fpe & GFC_FPE_ZERO) excepts |= _FPU_MASK_ZM;
-  if (options.fpe & GFC_FPE_OVERFLOW) excepts |= _FPU_MASK_OM;
-  if (options.fpe & GFC_FPE_UNDERFLOW) excepts |= _FPU_MASK_UM;
-  if (options.fpe & GFC_FPE_INEXACT) excepts |= _FPU_MASK_PM;
-
-  cw |= _FPU_MASK_ALL;
-  cw &= ~excepts;
 
   __asm__ __volatile__ ("fnclex\n\tfldcw\t%0" : : "m" (cw));
 
@@ -90,8 +190,8 @@ set_fpu (void)
       __asm__ __volatile__ ("%vstmxcsr\t%0" : "=m" (cw_sse));
 
       /* The SSE exception masks are shifted by 7 bits.  */
-      cw_sse |= _FPU_MASK_ALL << 7;
+      cw_sse |= (exc_clr << 7);
-      cw_sse &= ~(excepts << 7);
+      cw_sse &= ~(exc_set << 7);
 
       /* Clear stalled exception flags.  */
       cw_sse &= ~_FPU_EX_ALL;
@@ -100,6 +200,47 @@ set_fpu (void)
     }
 }
 
+void
+set_fpu (void)
+{
+  set_fpu_trap_exceptions (options.fpe, 0);
+}
+
+int
+get_fpu_trap_exceptions (void)
+{
+  int res = 0;
+  unsigned short cw;
+
+  __asm__ __volatile__ ("fstcw\t%0" : "=m" (cw));
+  cw &= _FPU_MASK_ALL;
+
+  if (has_sse())
+    {
+      unsigned int cw_sse;
+
+      __asm__ __volatile__ ("%vstmxcsr\t%0" : "=m" (cw_sse));
+
+      /* The SSE exception masks are shifted by 7 bits.  */
+      cw = cw | ((cw_sse >> 7) & _FPU_MASK_ALL);
+    }
+
+  if (~cw & _FPU_MASK_IM) res |= GFC_FPE_INVALID;
+  if (~cw & _FPU_MASK_DM) res |= GFC_FPE_DENORMAL;
+  if (~cw & _FPU_MASK_ZM) res |= GFC_FPE_ZERO;
+  if (~cw & _FPU_MASK_OM) res |= GFC_FPE_OVERFLOW;
+  if (~cw & _FPU_MASK_UM) res |= GFC_FPE_UNDERFLOW;
+  if (~cw & _FPU_MASK_PM) res |= GFC_FPE_INEXACT;
+
+  return res;
+}
+
+int
+support_fpu_trap (int flag __attribute__((unused)))
+{
+  return 1;
+}
+
 int
 get_fpu_except_flags (void)
 {
@@ -107,7 +248,7 @@ get_fpu_except_flags (void)
   int excepts;
   int result = 0;
 
-  __asm__ __volatile__ ("fnstsw\t%0" : "=a" (cw));
+  __asm__ __volatile__ ("fnstsw\t%0" : "=am" (cw));
   excepts = cw;
 
   if (has_sse())
@@ -130,6 +271,70 @@ get_fpu_except_flags (void)
   return result;
 }
 
+void
+set_fpu_except_flags (int set, int clear)
+{
+  my_fenv_t temp;
+  int exc_set = 0, exc_clr = 0;
+
+  /* Translate from GFC_PE_* values to _FPU_MASK_* values.  */
+  if (set & GFC_FPE_INVALID)
+    exc_set |= _FPU_MASK_IM;
+  if (clear & GFC_FPE_INVALID)
+    exc_clr |= _FPU_MASK_IM;
+
+  if (set & GFC_FPE_DENORMAL)
+    exc_set |= _FPU_MASK_DM;
+  if (clear & GFC_FPE_DENORMAL)
+    exc_clr |= _FPU_MASK_DM;
+
+  if (set & GFC_FPE_ZERO)
+    exc_set |= _FPU_MASK_ZM;
+  if (clear & GFC_FPE_ZERO)
+    exc_clr |= _FPU_MASK_ZM;
+
+  if (set & GFC_FPE_OVERFLOW)
+    exc_set |= _FPU_MASK_OM;
+  if (clear & GFC_FPE_OVERFLOW)
+    exc_clr |= _FPU_MASK_OM;
+
+  if (set & GFC_FPE_UNDERFLOW)
+    exc_set |= _FPU_MASK_UM;
+  if (clear & GFC_FPE_UNDERFLOW)
+    exc_clr |= _FPU_MASK_UM;
+
+  if (set & GFC_FPE_INEXACT)
+    exc_set |= _FPU_MASK_PM;
+  if (clear & GFC_FPE_INEXACT)
+    exc_clr |= _FPU_MASK_PM;
+
+
+  /* Change the flags. This is tricky on 387 (unlike SSE), because we have
+     FNSTSW but no FLDSW instruction.  */
+  __asm__ __volatile__ ("fnstenv\t%0" : "=m" (temp));
+  temp.__status_word &= ~exc_clr;
+  __asm__ __volatile__ ("fldenv\t%0" : : "m" (temp));
+
+  /* Change the flags on SSE.  */
+
+  if (has_sse())
+  {
+    unsigned int cw_sse;
+
+    __asm__ __volatile__ ("%vstmxcsr\t%0" : "=m" (cw_sse));
+    cw_sse &= ~exc_clr;
+    __asm__ __volatile__ ("%vldmxcsr\t%0" : : "m" (cw_sse));
+  }
+
+  local_feraiseexcept (exc_set);
+}
+
+int
+support_fpu_flag (int flag __attribute__((unused)))
+{
+  return 1;
+}
+
 void
 set_fpu_rounding_mode (int round)
 {
@@ -213,3 +418,44 @@ get_fpu_rounding_mode (void)
       return GFC_FPE_INVALID; /* Should be unreachable.  */
     }
 }
+
+int
+support_fpu_rounding_mode (int mode __attribute__((unused)))
+{
+  return 1;
+}
+
+void
+get_fpu_state (void *state)
+{
+  my_fenv_t *envp = state;
+
+  /* Check we can actually store the FPU state in the allocated size.  */
+  assert (sizeof(my_fenv_t) <= (size_t) GFC_FPE_STATE_BUFFER_SIZE);
+
+  __asm__ __volatile__ ("fnstenv\t%0" : "=m" (*envp));
+
+  /* fnstenv has the side effect of masking all exceptions, so we need
+     to restore the control word after that.  */
+  __asm__ __volatile__ ("fldcw\t%0" : : "m" (envp->__control_word));
+
+  if (has_sse())
+    __asm__ __volatile__ ("%vstmxcsr\t%0" : "=m" (envp->__mxcsr));
+}
+
+void
+set_fpu_state (void *state)
+{
+  my_fenv_t *envp = state;
+
+  /* Check we can actually store the FPU state in the allocated size.  */
+  assert (sizeof(my_fenv_t) <= (size_t) GFC_FPE_STATE_BUFFER_SIZE);
+
+  /* glibc sources (sysdeps/x86_64/fpu/fesetenv.c) do something more
+     complex than this, but I think it suffices in our case.  */
+  __asm__ __volatile__ ("fldenv\t%0" : : "m" (*envp));
+
+  if (has_sse())
+    __asm__ __volatile__ ("%vldmxcsr\t%0" : : "m" (envp->__mxcsr));
+}
+

libgfortran/config/fpu-aix.h

@@ -33,15 +33,103 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #include <fpxcp.h>
 #endif
 
+#ifdef HAVE_FENV_H
+#include <fenv.h>
+#endif
+
+
+void
+set_fpu_trap_exceptions (int trap, int notrap)
+{
+  fptrap_t mode_set = 0, mode_clr = 0;
+
+#ifdef TRP_INVALID
+  if (trap & GFC_FPE_INVALID)
+    mode_set |= TRP_INVALID;
+  if (notrap & GFC_FPE_INVALID)
+    mode_clr |= TRP_INVALID;
+#endif
+
+#ifdef TRP_DIV_BY_ZERO
+  if (trap & GFC_FPE_ZERO)
+    mode_set |= TRP_DIV_BY_ZERO;
+  if (notrap & GFC_FPE_ZERO)
+    mode_clr |= TRP_DIV_BY_ZERO;
+#endif
+
+#ifdef TRP_OVERFLOW
+  if (trap & GFC_FPE_OVERFLOW)
+    mode_set |= TRP_OVERFLOW;
+  if (notrap & GFC_FPE_OVERFLOW)
+    mode_clr |= TRP_OVERFLOW;
+#endif
+
+#ifdef TRP_UNDERFLOW
+  if (trap & GFC_FPE_UNDERFLOW)
+    mode_set |= TRP_UNDERFLOW;
+  if (notrap & GFC_FPE_UNDERFLOW)
+    mode_clr |= TRP_UNDERFLOW;
+#endif
+
+#ifdef TRP_INEXACT
+  if (trap & GFC_FPE_INEXACT)
+    mode_set |= TRP_INEXACT;
+  if (notrap & GFC_FPE_INEXACT)
+    mode_clr |= TRP_INEXACT;
+#endif
+
+  fp_trap (FP_TRAP_SYNC);
+  fp_enable (mode_set);
+  fp_disable (mode_clr);
+}
+
+
+int
+get_fpu_trap_exceptions (void)
+{
+  int res = 0;
+
+#ifdef TRP_INVALID
+  if (fp_is_enabled (TRP_INVALID))
+    res |= GFC_FPE_INVALID;
+#endif
+
+#ifdef TRP_DIV_BY_ZERO
+  if (fp_is_enabled (TRP_DIV_BY_ZERO))
+    res |= GFC_FPE_ZERO;
+#endif
+
+#ifdef TRP_OVERFLOW
+  if (fp_is_enabled (TRP_OVERFLOW))
+    res |= GFC_FPE_OVERFLOW;
+#endif
+
+#ifdef TRP_UNDERFLOW
+  if (fp_is_enabled (TRP_UNDERFLOW))
+    res |= GFC_FPE_UNDERFLOW;
+#endif
+
+#ifdef TRP_INEXACT
+  if (fp_is_enabled (TRP_INEXACT))
+    res |= GFC_FPE_INEXACT;
+#endif
+
+  return res;
+}
+
+
+int
+support_fpu_trap (int flag)
+{
+  return support_fpu_flag (flag);
+}
+
+
 void
 set_fpu (void)
 {
-  fptrap_t mode = 0;
+#ifndef TRP_INVALID
-
   if (options.fpe & GFC_FPE_INVALID)
-#ifdef TRP_INVALID
-    mode |= TRP_INVALID;
-#else
     estr_write ("Fortran runtime warning: IEEE 'invalid operation' "
 	        "exception not supported.\n");
 #endif
@@ -50,43 +138,33 @@ set_fpu (void)
     estr_write ("Fortran runtime warning: Floating point 'denormal operand' "
 	        "exception not supported.\n");
 
+#ifndef TRP_DIV_BY_ZERO
   if (options.fpe & GFC_FPE_ZERO)
-#ifdef TRP_DIV_BY_ZERO
-    mode |= TRP_DIV_BY_ZERO;
-#else
     estr_write ("Fortran runtime warning: IEEE 'division by zero' "
 	        "exception not supported.\n");
 #endif
 
+#ifndef TRP_OVERFLOW
   if (options.fpe & GFC_FPE_OVERFLOW)
-#ifdef TRP_OVERFLOW
-    mode |= TRP_OVERFLOW;
-#else
     estr_write ("Fortran runtime warning: IEEE 'overflow' "
 	        "exception not supported.\n");
 #endif
 
+#ifndef TRP_UNDERFLOW
   if (options.fpe & GFC_FPE_UNDERFLOW)
-#ifdef TRP_UNDERFLOW
-    mode |= TRP_UNDERFLOW;
-#else
     estr_write ("Fortran runtime warning: IEEE 'underflow' "
 	        "exception not supported.\n");
 #endif
 
+#ifndef TRP_INEXACT
   if (options.fpe & GFC_FPE_INEXACT)
-#ifdef TRP_INEXACT
-    mode |= TRP_INEXACT;
-#else
     estr_write ("Fortran runtime warning: IEEE 'inexact' "
 	        "exception not supported.\n");
 #endif
 
-  fp_trap(FP_TRAP_SYNC);
+  set_fpu_trap_exceptions (options.fpe, 0);
-  fp_enable(mode);
 }
 
-
 int
 get_fpu_except_flags (void)
 {
@@ -118,6 +196,98 @@ get_fpu_except_flags (void)
 }
 
 
+void
+set_fpu_except_flags (int set, int clear)
+{
+  int exc_set = 0, exc_clr = 0;
+
+#ifdef FP_INVALID
+  if (set & GFC_FPE_INVALID)
+    exc_set |= FP_INVALID;
+  else if (clear & GFC_FPE_INVALID)
+    exc_clr |= FP_INVALID;
+#endif
+
+#ifdef FP_DIV_BY_ZERO
+  if (set & GFC_FPE_ZERO)
+    exc_set |= FP_DIV_BY_ZERO;
+  else if (clear & GFC_FPE_ZERO)
+    exc_clr |= FP_DIV_BY_ZERO;
+#endif
+
+#ifdef FP_OVERFLOW
+  if (set & GFC_FPE_OVERFLOW)
+    exc_set |= FP_OVERFLOW;
+  else if (clear & GFC_FPE_OVERFLOW)
+    exc_clr |= FP_OVERFLOW;
+#endif
+
+#ifdef FP_UNDERFLOW
+  if (set & GFC_FPE_UNDERFLOW)
+    exc_set |= FP_UNDERFLOW;
+  else if (clear & GFC_FPE_UNDERFLOW)
+    exc_clr |= FP_UNDERFLOW;
+#endif
+
+/* AIX does not have FP_DENORMAL.  */
+
+#ifdef FP_INEXACT
+  if (set & GFC_FPE_INEXACT)
+    exc_set |= FP_INEXACT;
+  else if (clear & GFC_FPE_INEXACT)
+    exc_clr |= FP_INEXACT;
+#endif
+
+  fp_clr_flag (exc_clr);
+  fp_set_flag (exc_set);
+}
+
+
+int
+support_fpu_flag (int flag)
+{
+  if (flag & GFC_FPE_INVALID)
+  {
+#ifndef FP_INVALID
+    return 0;
+#endif
+  }
+  else if (flag & GFC_FPE_ZERO)
+  {
+#ifndef FP_DIV_BY_ZERO
+    return 0;
+#endif
+  }
+  else if (flag & GFC_FPE_OVERFLOW)
+  {
+#ifndef FP_OVERFLOW
+    return 0;
+#endif
+  }
+  else if (flag & GFC_FPE_UNDERFLOW)
+  {
+#ifndef FP_UNDERFLOW
+    return 0;
+#endif
+  }
+  else if (flag & GFC_FPE_DENORMAL)
+  {
+    /* AIX does not support denormal flag.  */
+    return 0;
+  }
+  else if (flag & GFC_FPE_INEXACT)
+  {
+#ifndef FP_INEXACT
+    return 0;
+#endif
+  }
+
+  return 1;
+}
+
+
+
+
 int
 get_fpu_rounding_mode (void)
 {
@@ -188,3 +358,60 @@ set_fpu_rounding_mode (int mode)
 
   fesetround (rnd_mode);
 }
+
+
+int
+support_fpu_rounding_mode (int mode)
+{
+  switch (mode)
+    {
+      case GFC_FPE_TONEAREST:
+#ifdef FE_TONEAREST
+	return 1;
+#else
+	return 0;
+#endif
+
+#ifdef FE_UPWARD
+	return 1;
+#else
+	return 0;
+#endif
+
+#ifdef FE_DOWNWARD
+	return 1;
+#else
+	return 0;
+#endif
+
+#ifdef FE_TOWARDZERO
+	return 1;
+#else
+	return 0;
+#endif
+
+      default:
+	return 0;
+    }
+}
+
+
+
+void
+get_fpu_state (void *state)
+{
+  /* Check we can actually store the FPU state in the allocated size.  */
+  assert (sizeof(fenv_t) <= GFC_FPE_STATE_BUFFER_SIZE);
+
+  fegetenv (state);
+}
+
+void
+set_fpu_state (void *state)
+{
+  /* Check we can actually store the FPU state in the allocated size.  */
+  assert (sizeof(fenv_t) <= GFC_FPE_STATE_BUFFER_SIZE);
+
+  fesetenv (state);
+}
+

libgfortran/config/fpu-generic.h

@@ -51,6 +51,12 @@ set_fpu (void)
 	        "exception not supported.\n");
 }
 
+void
+set_fpu_trap_exceptions (int trap __attribute__((unused)),
+			 int notrap __attribute__((unused)))
+{
+}
+
 int
 get_fpu_except_flags (void)
 {

libgfortran/config/fpu-glibc.h

@@ -27,63 +27,141 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    feenableexcept function in fenv.h to set individual exceptions
    (there's nothing to do that in C99).  */
 
+#include <assert.h>
+
 #ifdef HAVE_FENV_H
 #include <fenv.h>
 #endif
 
+
+void set_fpu_trap_exceptions (int trap, int notrap)
+{
+#ifdef FE_INVALID
+  if (trap & GFC_FPE_INVALID)
+    feenableexcept (FE_INVALID);
+  if (notrap & GFC_FPE_INVALID)
+    fedisableexcept (FE_INVALID);
+#endif
+
+/* glibc does never have a FE_DENORMAL.  */
+#ifdef FE_DENORMAL
+  if (trap & GFC_FPE_DENORMAL)
+    feenableexcept (FE_DENORMAL);
+  if (notrap & GFC_FPE_DENORMAL)
+    fedisableexcept (FE_DENORMAL);
+#endif
+
+#ifdef FE_DIVBYZERO
+  if (trap & GFC_FPE_ZERO)
+    feenableexcept (FE_DIVBYZERO);
+  if (notrap & GFC_FPE_ZERO)
+    fedisableexcept (FE_DIVBYZERO);
+#endif
+
+#ifdef FE_OVERFLOW
+  if (trap & GFC_FPE_OVERFLOW)
+    feenableexcept (FE_OVERFLOW);
+  if (notrap & GFC_FPE_OVERFLOW)
+    fedisableexcept (FE_OVERFLOW);
+#endif
+
+#ifdef FE_UNDERFLOW
+  if (trap & GFC_FPE_UNDERFLOW)
+    feenableexcept (FE_UNDERFLOW);
+  if (notrap & GFC_FPE_UNDERFLOW)
+    fedisableexcept (FE_UNDERFLOW);
+#endif
+
+#ifdef FE_INEXACT
+  if (trap & GFC_FPE_INEXACT)
+    feenableexcept (FE_INEXACT);
+  if (notrap & GFC_FPE_INEXACT)
+    fedisableexcept (FE_INEXACT);
+#endif
+}
+
+
+int
+get_fpu_trap_exceptions (void)
+{
+  int exceptions = fegetexcept ();
+  int res = 0;
+
+#ifdef FE_INVALID
+  if (exceptions & FE_INVALID) res |= GFC_FPE_INVALID;
+#endif
+
+#ifdef FE_DENORMAL
+  if (exceptions & FE_DENORMAL) res |= GFC_FPE_DENORMAL;
+#endif
+
+#ifdef FE_DIVBYZERO
+  if (exceptions & FE_DIVBYZERO) res |= GFC_FPE_ZERO;
+#endif
+
+#ifdef FE_OVERFLOW
+  if (exceptions & FE_OVERFLOW) res |= GFC_FPE_OVERFLOW;
+#endif
+
+#ifdef FE_UNDERFLOW
+  if (exceptions & FE_UNDERFLOW) res |= GFC_FPE_UNDERFLOW;
+#endif
+
+#ifdef FE_INEXACT
+  if (exceptions & FE_INEXACT) res |= GFC_FPE_INEXACT;
+#endif
+
+  return res;
+}
+
+
+int
+support_fpu_trap (int flag)
+{
+  return support_fpu_flag (flag);
+}
+
+
 void set_fpu (void)
 {
-  if (FE_ALL_EXCEPT != 0)
+#ifndef FE_INVALID
-    fedisableexcept (FE_ALL_EXCEPT);
-
   if (options.fpe & GFC_FPE_INVALID)
-#ifdef FE_INVALID
-    feenableexcept (FE_INVALID);
-#else
     estr_write ("Fortran runtime warning: IEEE 'invalid operation' "
 	        "exception not supported.\n");
 #endif
 
 /* glibc does never have a FE_DENORMAL.  */
+#ifndef FE_DENORMAL
   if (options.fpe & GFC_FPE_DENORMAL)
-#ifdef FE_DENORMAL
-    feenableexcept (FE_DENORMAL);
-#else
     estr_write ("Fortran runtime warning: Floating point 'denormal operand' "
 	        "exception not supported.\n");
 #endif
 
+#ifndef FE_DIVBYZERO
   if (options.fpe & GFC_FPE_ZERO)
-#ifdef FE_DIVBYZERO
-    feenableexcept (FE_DIVBYZERO);
-#else
     estr_write ("Fortran runtime warning: IEEE 'division by zero' "
 	        "exception not supported.\n");
 #endif
 
+#ifndef FE_OVERFLOW
   if (options.fpe & GFC_FPE_OVERFLOW)
-#ifdef FE_OVERFLOW
-    feenableexcept (FE_OVERFLOW);
-#else
     estr_write ("Fortran runtime warning: IEEE 'overflow' "
 	        "exception not supported.\n");
 #endif
 
+#ifndef FE_UNDERFLOW
   if (options.fpe & GFC_FPE_UNDERFLOW)
-#ifdef FE_UNDERFLOW
-    feenableexcept (FE_UNDERFLOW);
-#else
     estr_write ("Fortran runtime warning: IEEE 'underflow' "
 	        "exception not supported.\n");
 #endif
 
+#ifndef FE_INEXACT
   if (options.fpe & GFC_FPE_INEXACT)
-#ifdef FE_INEXACT
-    feenableexcept (FE_INEXACT);
-#else
     estr_write ("Fortran runtime warning: IEEE 'inexact' "
 	        "exception not supported.\n");
 #endif
+
+  set_fpu_trap_exceptions (options.fpe, 0);
 }
 
 
@@ -129,6 +207,102 @@ get_fpu_except_flags (void)
 }
 
 
+void
+set_fpu_except_flags (int set, int clear)
+{
+  int exc_set = 0, exc_clr = 0;
+
+#ifdef FE_INVALID
+  if (set & GFC_FPE_INVALID)
+    exc_set |= FE_INVALID;
+  else if (clear & GFC_FPE_INVALID)
+    exc_clr |= FE_INVALID;
+#endif
+
+#ifdef FE_DIVBYZERO
+  if (set & GFC_FPE_ZERO)
+    exc_set |= FE_DIVBYZERO;
+  else if (clear & GFC_FPE_ZERO)
+    exc_clr |= FE_DIVBYZERO;
+#endif
+
+#ifdef FE_OVERFLOW
+  if (set & GFC_FPE_OVERFLOW)
+    exc_set |= FE_OVERFLOW;
+  else if (clear & GFC_FPE_OVERFLOW)
+    exc_clr |= FE_OVERFLOW;
+#endif
+
+#ifdef FE_UNDERFLOW
+  if (set & GFC_FPE_UNDERFLOW)
+    exc_set |= FE_UNDERFLOW;
+  else if (clear & GFC_FPE_UNDERFLOW)
+    exc_clr |= FE_UNDERFLOW;
+#endif
+
+#ifdef FE_DENORMAL
+  if (set & GFC_FPE_DENORMAL)
+    exc_set |= FE_DENORMAL;
+  else if (clear & GFC_FPE_DENORMAL)
+    exc_clr |= FE_DENORMAL;
+#endif
+
+#ifdef FE_INEXACT
+  if (set & GFC_FPE_INEXACT)
+    exc_set |= FE_INEXACT;
+  else if (clear & GFC_FPE_INEXACT)
+    exc_clr |= FE_INEXACT;
+#endif
+
+  feclearexcept (exc_clr);
+  feraiseexcept (exc_set);
+}
+
+
+int
+support_fpu_flag (int flag)
+{
+  if (flag & GFC_FPE_INVALID)
+  {
+#ifndef FE_INVALID
+    return 0;
+#endif
+  }
+  else if (flag & GFC_FPE_ZERO)
+  {
+#ifndef FE_DIVBYZERO
+    return 0;
+#endif
+  }
+  else if (flag & GFC_FPE_OVERFLOW)
+  {
+#ifndef FE_OVERFLOW
+    return 0;
+#endif
+  }
+  else if (flag & GFC_FPE_UNDERFLOW)
+  {
+#ifndef FE_UNDERFLOW
+    return 0;
+#endif
+  }
+  else if (flag & GFC_FPE_DENORMAL)
+  {
+#ifndef FE_DENORMAL
+    return 0;
+#endif
+  }
+  else if (flag & GFC_FPE_INEXACT)
+  {
+#ifndef FE_INEXACT
+    return 0;
+#endif
+  }
+
+  return 1;
+}
+
+
 int
 get_fpu_rounding_mode (void)
 {
@@ -199,3 +373,60 @@ set_fpu_rounding_mode (int mode)
 
   fesetround (rnd_mode);
 }
+
+
+int
+support_fpu_rounding_mode (int mode)
+{
+  switch (mode)
+    {
+      case GFC_FPE_TONEAREST:
+#ifdef FE_TONEAREST
+	return 1;
+#else
+	return 0;
+#endif
+
+#ifdef FE_UPWARD
+	return 1;
+#else
+	return 0;
+#endif
+
+#ifdef FE_DOWNWARD
+	return 1;
+#else
+	return 0;
+#endif
+
+#ifdef FE_TOWARDZERO
+	return 1;
+#else
+	return 0;
+#endif
+
+      default:
+	return 0;
+    }
+}
+
+
+void
+get_fpu_state (void *state)
+{
+  /* Check we can actually store the FPU state in the allocated size.  */
+  assert (sizeof(fenv_t) <= GFC_FPE_STATE_BUFFER_SIZE);
+
+  fegetenv (state);
+}
+
+
+void
+set_fpu_state (void *state)
+{
+  /* Check we can actually store the FPU state in the allocated size.  */
+  assert (sizeof(fenv_t) <= GFC_FPE_STATE_BUFFER_SIZE);
+
+  fesetenv (state);
+}
+

libgfortran/config/fpu-sysv.h

@@ -25,73 +25,174 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 
 /* FPU-related code for SysV platforms with fpsetmask().  */
 
+/* BSD and Solaris systems have slightly different types and functions
+   naming.  We deal with these here, to simplify the code below.  */
+
+#if HAVE_FP_EXCEPT
+# define FP_EXCEPT_TYPE fp_except
+#elif HAVE_FP_EXCEPT_T
+# define FP_EXCEPT_TYPE fp_except_t
+#else
+  choke me
+#endif
+
+#if HAVE_FP_RND
+# define FP_RND_TYPE fp_rnd
+#elif HAVE_FP_RND_T
+# define FP_RND_TYPE fp_rnd_t
+#else
+  choke me
+#endif
+
+#if HAVE_FPSETSTICKY
+# define FPSETSTICKY fpsetsticky
+#elif HAVE_FPRESETSTICKY
+# define FPSETSTICKY fpresetsticky
+#else
+  choke me
+#endif
+
+
 void
-set_fpu (void)
+set_fpu_trap_exceptions (int trap, int notrap)
 {
-  int cw = 0;
+  FP_EXCEPT_TYPE cw = fpgetmask();
 
-  if (options.fpe & GFC_FPE_INVALID)
 #ifdef FP_X_INV
+  if (trap & GFC_FPE_INVALID)
     cw |= FP_X_INV;
-#else
+  if (notrap & GFC_FPE_INVALID)
-    estr_write ("Fortran runtime warning: IEEE 'invalid operation' "
+    cw &= ~FP_X_INV;
-	        "exception not supported.\n");
 #endif
 
-  if (options.fpe & GFC_FPE_DENORMAL)
 #ifdef FP_X_DNML
+  if (trap & GFC_FPE_DENORMAL)
     cw |= FP_X_DNML;
-#else
+  if (notrap & GFC_FPE_DENORMAL)
-    estr_write ("Fortran runtime warning: Floating point 'denormal operand' "
+    cw &= ~FP_X_DNML;
-	        "exception not supported.\n");
 #endif
 
-  if (options.fpe & GFC_FPE_ZERO)
 #ifdef FP_X_DZ
+  if (trap & GFC_FPE_ZERO)
     cw |= FP_X_DZ;
-#else
+  if (notrap & GFC_FPE_ZERO)
-    estr_write ("Fortran runtime warning: IEEE 'division by zero' "
+    cw &= ~FP_X_DZ;
-	        "exception not supported.\n");
 #endif
 
-  if (options.fpe & GFC_FPE_OVERFLOW)
 #ifdef FP_X_OFL
+  if (trap & GFC_FPE_OVERFLOW)
     cw |= FP_X_OFL;
-#else
+  if (notrap & GFC_FPE_OVERFLOW)
-    estr_write ("Fortran runtime warning: IEEE 'overflow' "
+    cw &= ~FP_X_OFL;
-	        "exception not supported.\n");
 #endif
 
-  if (options.fpe & GFC_FPE_UNDERFLOW)
 #ifdef FP_X_UFL
+  if (trap & GFC_FPE_UNDERFLOW)
     cw |= FP_X_UFL;
-#else
+  if (notrap & GFC_FPE_UNDERFLOW)
-    estr_write ("Fortran runtime warning: IEEE 'underflow' "
+    cw &= ~FP_X_UFL;
-	        "exception not supported.\n");
 #endif
 
-  if (options.fpe & GFC_FPE_INEXACT)
 #ifdef FP_X_IMP
+  if (trap & GFC_FPE_INEXACT)
     cw |= FP_X_IMP;
-#else
+  if (notrap & GFC_FPE_INEXACT)
-    estr_write ("Fortran runtime warning: IEEE 'inexact' "
+    cw &= ~FP_X_IMP;
-	        "exception not supported.\n");
 #endif
 
   fpsetmask(cw);
 }
 
+
+int
+get_fpu_trap_exceptions (void)
+{
+  int res = 0;
+  FP_EXCEPT_TYPE cw = fpgetmask();
+
+#ifdef FP_X_INV
+  if (cw & FP_X_INV) res |= GFC_FPE_INVALID;
+#endif
+
+#ifdef FP_X_DNML
+  if (cw & FP_X_DNML) res |= GFC_FPE_DENORMAL;
+#endif
+
+#ifdef FP_X_DZ
+  if (cw & FP_X_DZ) res |= GFC_FPE_ZERO;
+#endif
+
+#ifdef FP_X_OFL
+  if (cw & FP_X_OFL) res |= GFC_FPE_OVERFLOW;
+#endif
+
+#ifdef FP_X_UFL
+  if (cw & FP_X_UFL) res |= GFC_FPE_UNDERFLOW;
+#endif
+
+#ifdef FP_X_IMP
+  if (cw & FP_X_IMP) res |= GFC_FPE_INEXACT;
+#endif
+
+  return res;
+}
+
+
+int
+support_fpu_trap (int flag)
+{
+  return support_fpu_flag (flag);
+}
+
+
+void
+set_fpu (void)
+{
+#ifndef FP_X_INV
+  if (options.fpe & GFC_FPE_INVALID)
+    estr_write ("Fortran runtime warning: IEEE 'invalid operation' "
+	        "exception not supported.\n");
+#endif
+
+#ifndef FP_X_DNML
+  if (options.fpe & GFC_FPE_DENORMAL)
+    estr_write ("Fortran runtime warning: Floating point 'denormal operand' "
+	        "exception not supported.\n");
+#endif
+
+#ifndef FP_X_DZ
+  if (options.fpe & GFC_FPE_ZERO)
+    estr_write ("Fortran runtime warning: IEEE 'division by zero' "
+	        "exception not supported.\n");
+#endif
+
+#ifndef FP_X_OFL
+  if (options.fpe & GFC_FPE_OVERFLOW)
+    estr_write ("Fortran runtime warning: IEEE 'overflow' "
+	        "exception not supported.\n");
+#endif
+
+#ifndef FP_X_UFL
+  if (options.fpe & GFC_FPE_UNDERFLOW)
+    estr_write ("Fortran runtime warning: IEEE 'underflow' "
+	        "exception not supported.\n");
+#endif
+
+#ifndef FP_X_IMP
+  if (options.fpe & GFC_FPE_INEXACT)
+    estr_write ("Fortran runtime warning: IEEE 'inexact' "
+	        "exception not supported.\n");
+#endif
+
+  set_fpu_trap_exceptions (options.fpe, 0);
+}
+
+
 int
 get_fpu_except_flags (void)
 {
   int result;
-#if HAVE_FP_EXCEPT
+  FP_EXCEPT_TYPE set_excepts;
-  fp_except set_excepts;
-#elif HAVE_FP_EXCEPT_T
-  fp_except_t set_excepts;
-#else
-  choke me
-#endif
 
   result = 0;
   set_excepts = fpgetsticky ();
@@ -130,6 +231,103 @@ get_fpu_except_flags (void)
 }
 
 
+void
+set_fpu_except_flags (int set, int clear)
+{
+  FP_EXCEPT_TYPE flags;
+
+  flags = fpgetsticky ();
+
+#ifdef FP_X_INV
+  if (set & GFC_FPE_INVALID)
+    flags |= FP_X_INV;
+  if (clear & GFC_FPE_INVALID)
+    flags &= ~FP_X_INV;
+#endif
+
+#ifdef FP_X_DZ
+  if (set & GFC_FPE_ZERO)
+    flags |= FP_X_DZ;
+  if (clear & GFC_FPE_ZERO)
+    flags &= ~FP_X_DZ;
+#endif
+
+#ifdef FP_X_OFL
+  if (set & GFC_FPE_OVERFLOW)
+    flags |= FP_X_OFL;
+  if (clear & GFC_FPE_OVERFLOW)
+    flags &= ~FP_X_OFL;
+#endif
+
+#ifdef FP_X_UFL
+  if (set & GFC_FPE_UNDERFLOW)
+    flags |= FP_X_UFL;
+  if (clear & GFC_FPE_UNDERFLOW)
+    flags &= ~FP_X_UFL;
+#endif
+
+#ifdef FP_X_DNML
+  if (set & GFC_FPE_DENORMAL)
+    flags |= FP_X_DNML;
+  if (clear & GFC_FPE_DENORMAL)
+    flags &= ~FP_X_DNML;
+#endif
+
+#ifdef FP_X_IMP
+  if (set & GFC_FPE_INEXACT)
+    flags |= FP_X_IMP;
+  if (clear & GFC_FPE_INEXACT)
+    flags &= ~FP_X_IMP;
+#endif
+
+  FPSETSTICKY (flags);
+}
+
+
+int
+support_fpu_flag (int flag)
+{
+  if (flag & GFC_FPE_INVALID)
+  {
+#ifndef FP_X_INV
+    return 0;
+#endif
+  }
+  else if (flag & GFC_FPE_ZERO)
+  {
+#ifndef FP_X_DZ
+    return 0;
+#endif
+  }
+  else if (flag & GFC_FPE_OVERFLOW)
+  {
+#ifndef FP_X_OFL
+    return 0;
+#endif
+  }
+  else if (flag & GFC_FPE_UNDERFLOW)
+  {
+#ifndef FP_X_UFL
+    return 0;
+#endif
+  }
+  else if (flag & GFC_FPE_DENORMAL)
+  {
+#ifndef FP_X_DNML
+    return 0;
+#endif
+  }
+  else if (flag & GFC_FPE_INEXACT)
+  {
+#ifndef FP_X_IMP
+    return 0;
+#endif
+  }
+
+  return 1;
+}
+
+
 int
 get_fpu_rounding_mode (void)
 {
@@ -163,13 +361,7 @@ get_fpu_rounding_mode (void)
 void
 set_fpu_rounding_mode (int mode)
 {
-#if HAVE_FP_RND
+  FP_RND_TYPE rnd_mode;
-  fp_rnd rnd_mode;
-#elif HAVE_FP_RND_T
-  fp_rnd_t rnd_mode;
-#else
-  choke me
-#endif
 
   switch (mode)
     {
@@ -201,3 +393,78 @@ set_fpu_rounding_mode (int mode)
     }
   fpsetround (rnd_mode);
 }
+
+
+int
+support_fpu_rounding_mode (int mode)
+{
+  switch (mode)
+    {
+      case GFC_FPE_TONEAREST:
+#ifdef FP_RN
+	return 1;
+#else
+	return 0;
+#endif
+
+      case GFC_FPE_UPWARD:
+#ifdef FP_RP
+	return 1;
+#else
+	return 0;
+#endif
+
+      case GFC_FPE_DOWNWARD:
+#ifdef FP_RM
+	return 1;
+#else
+	return 0;
+#endif
+
+      case GFC_FPE_TOWARDZERO:
+#ifdef FP_RZ
+	return 1;
+#else
+	return 0;
+#endif
+
+      default:
+	return 0;
+    }
+}
+
+
+typedef struct
+{
+  FP_EXCEPT_TYPE mask;
+  FP_EXCEPT_TYPE sticky;
+  FP_RND_TYPE round;
+} fpu_state_t;
+
+
+void
+get_fpu_state (void *s)
+{
+  fpu_state_t *state = s;
+
+  /* Check we can actually store the FPU state in the allocated size.  */
+  assert (sizeof(fpu_state_t) <= GFC_FPE_STATE_BUFFER_SIZE);
+
+  state->mask = fpgetmask ();
+  state->sticky = fpgetsticky ();
+  state->round = fpgetround ();
+}
+
+void
+set_fpu_state (void *s)
+{
+  fpu_state_t *state = s;
+
+  /* Check we can actually store the FPU state in the allocated size.  */
+  assert (sizeof(fpu_state_t) <= GFC_FPE_STATE_BUFFER_SIZE);
+
+  fpsetmask (state->mask);
+  FPSETSTICKY (state->sticky);
+  fpsetround (state->round);
+}
+

libgfortran/configure

@@ -606,6 +606,9 @@ am__EXEEXT_TRUE
 LTLIBOBJS
 LIBOBJS
 IEEE_FLAGS
+IEEE_SUPPORT
+IEEE_SUPPORT_FALSE
+IEEE_SUPPORT_TRUE
 FPU_HOST_HEADER
 LIBGFOR_BUILD_QUAD_FALSE
 LIBGFOR_BUILD_QUAD_TRUE
@@ -12346,7 +12349,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12349 "configure"
+#line 12352 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12452,7 +12455,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12455 "configure"
+#line 12458 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -26119,9 +26122,22 @@ fi
 . ${srcdir}/configure.host
 { $as_echo "$as_me:${as_lineno-$LINENO}: FPU dependent file will be ${fpu_host}.h" >&5
 $as_echo "$as_me: FPU dependent file will be ${fpu_host}.h" >&6;}
+{ $as_echo "$as_me:${as_lineno-$LINENO}: Support for IEEE modules: ${ieee_support}" >&5
+$as_echo "$as_me: Support for IEEE modules: ${ieee_support}" >&6;}
 FPU_HOST_HEADER=config/${fpu_host}.h
 
 
+# Whether we will build the IEEE modules
+ if test x${ieee_support} = xyes; then
+  IEEE_SUPPORT_TRUE=
+  IEEE_SUPPORT_FALSE='#'
+else
+  IEEE_SUPPORT_TRUE='#'
+  IEEE_SUPPORT_FALSE=
+fi
+
+
+
 # Some targets require additional compiler options for IEEE compatibility.
 IEEE_FLAGS="${ieee_flags}"
 
@@ -26765,6 +26781,10 @@ if test -z "${LIBGFOR_BUILD_QUAD_TRUE}" && test -z "${LIBGFOR_BUILD_QUAD_FALSE}"
   as_fn_error "conditional \"LIBGFOR_BUILD_QUAD\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${IEEE_SUPPORT_TRUE}" && test -z "${IEEE_SUPPORT_FALSE}"; then
+  as_fn_error "conditional \"IEEE_SUPPORT\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 
 : ${CONFIG_STATUS=./config.status}
 ac_write_fail=0

libgfortran/configure.ac

@@ -530,6 +530,10 @@ AC_CHECK_TYPES([fp_rnd,fp_rnd_t], [], [], [[
 #include <math.h>
 ]])
 
+# Check whether we have fpsetsticky or fpresetsticky
+AC_CHECK_FUNC([fpsetsticky],[have_fpsetsticky=yes AC_DEFINE([HAVE_FPSETSTICKY],[1],[fpsetsticky is present])])
+AC_CHECK_FUNC([fpresetsticky],[have_fpresetsticky=yes AC_DEFINE([HAVE_FPRESETSTICKY],[1],[fpresetsticky is present])])
+
 # Check for AIX fp_trap and fp_enable
 AC_CHECK_FUNC([fp_trap],[have_fp_trap=yes AC_DEFINE([HAVE_FP_TRAP],[1],[fp_trap is present])])
 AC_CHECK_FUNC([fp_enable],[have_fp_enable=yes AC_DEFINE([HAVE_FP_ENABLE],[1],[fp_enable is present])])
@@ -539,9 +543,14 @@ AC_CHECK_FUNC([fp_enable],[have_fp_enable=yes AC_DEFINE([HAVE_FP_ENABLE],[1],[fp
 # build chain.
 . ${srcdir}/configure.host
 AC_MSG_NOTICE([FPU dependent file will be ${fpu_host}.h])
+AC_MSG_NOTICE([Support for IEEE modules: ${ieee_support}])
 FPU_HOST_HEADER=config/${fpu_host}.h
 AC_SUBST(FPU_HOST_HEADER)
 
+# Whether we will build the IEEE modules
+AM_CONDITIONAL(IEEE_SUPPORT,[test x${ieee_support} = xyes])
+AC_SUBST(IEEE_SUPPORT)
+
 # Some targets require additional compiler options for IEEE compatibility.
 IEEE_FLAGS="${ieee_flags}"
 AC_SUBST(IEEE_FLAGS)

libgfortran/configure.host

@@ -19,26 +19,32 @@
 
 # DEFAULTS
 fpu_host='fpu-generic'
+ieee_support='no'
+
+if test "x${have_fp_enable}" = "xyes" && test "x${have_fp_trap}" = "xyes"; then
+  fpu_host='fpu-aix'
+  ieee_support='yes'
+fi
+
+if test "x${have_fpsetmask}" = "xyes"; then
+  fpu_host='fpu-sysv'
+  ieee_support='yes'
+fi
 
 if test "x${have_feenableexcept}" = "xyes"; then
   fpu_host='fpu-glibc'
+  ieee_support='yes'
 fi
 
 # x86 asm should be used instead of glibc, since glibc doesn't support
 # the x86 denormal exception.
 case "${host_cpu}" in
   i?86 | x86_64)
-    fpu_host='fpu-387' ;;
+    fpu_host='fpu-387'
+    ieee_support='yes'
+    ;;
 esac
 
-if test "x${have_fpsetmask}" = "xyes"; then
-  fpu_host='fpu-sysv'
-fi
-
-if test "x${have_fp_enable}" = "xyes" && test "x${have_fp_trap}" = "xyes"; then
-  fpu_host='fpu-aix'
-fi
-
 # Some targets require additional compiler options for NaN/Inf.
 ieee_flags=
 case "${host_cpu}" in

libgfortran/gfortran.map

@@ -1195,6 +1195,117 @@ GFORTRAN_1.5 {
     _gfortran_backtrace;
 } GFORTRAN_1.4; 
 
+GFORTRAN_1.6 {
+  global:
+    _gfortran_ieee_copy_sign_4_4_;
+    _gfortran_ieee_copy_sign_4_8_;
+    _gfortran_ieee_copy_sign_8_4_;
+    _gfortran_ieee_copy_sign_8_8_;
+    _gfortran_ieee_is_finite_4_;
+    _gfortran_ieee_is_finite_8_;
+    _gfortran_ieee_is_nan_4_;
+    _gfortran_ieee_is_nan_8_;
+    _gfortran_ieee_is_negative_4_;
+    _gfortran_ieee_is_negative_8_;
+    _gfortran_ieee_is_normal_4_;
+    _gfortran_ieee_is_normal_8_;
+    _gfortran_ieee_logb_4_;
+    _gfortran_ieee_logb_8_;
+    _gfortran_ieee_next_after_4_4_;
+    _gfortran_ieee_next_after_4_8_;
+    _gfortran_ieee_next_after_8_4_;
+    _gfortran_ieee_next_after_8_8_;
+    _gfortran_ieee_procedure_entry;
+    _gfortran_ieee_procedure_exit;
+    _gfortran_ieee_rem_4_4_;
+    _gfortran_ieee_rem_4_8_;
+    _gfortran_ieee_rem_8_4_;
+    _gfortran_ieee_rem_8_8_;
+    _gfortran_ieee_rint_4_;
+    _gfortran_ieee_rint_8_;
+    _gfortran_ieee_scalb_4_;
+    _gfortran_ieee_scalb_8_;
+    _gfortran_ieee_unordered_4_4_;
+    _gfortran_ieee_unordered_4_8_;
+    _gfortran_ieee_unordered_8_4_;
+    _gfortran_ieee_unordered_8_8_;
+    __ieee_arithmetic_MOD_ieee_class_4;
+    __ieee_arithmetic_MOD_ieee_class_8;
+    __ieee_arithmetic_MOD_ieee_class_type_eq;
+    __ieee_arithmetic_MOD_ieee_class_type_ne;
+    __ieee_arithmetic_MOD_ieee_get_rounding_mode;
+    __ieee_arithmetic_MOD_ieee_get_underflow_mode;
+    __ieee_arithmetic_MOD_ieee_round_type_eq;
+    __ieee_arithmetic_MOD_ieee_round_type_ne;
+    __ieee_arithmetic_MOD_ieee_selected_real_kind;
+    __ieee_arithmetic_MOD_ieee_set_rounding_mode;
+    __ieee_arithmetic_MOD_ieee_set_underflow_mode;
+    __ieee_arithmetic_MOD_ieee_support_datatype_4;
+    __ieee_arithmetic_MOD_ieee_support_datatype_8;
+    __ieee_arithmetic_MOD_ieee_support_datatype_10;
+    __ieee_arithmetic_MOD_ieee_support_datatype_16;
+    __ieee_arithmetic_MOD_ieee_support_datatype_noarg;
+    __ieee_arithmetic_MOD_ieee_support_denormal_4;
+    __ieee_arithmetic_MOD_ieee_support_denormal_8;
+    __ieee_arithmetic_MOD_ieee_support_denormal_10;
+    __ieee_arithmetic_MOD_ieee_support_denormal_16;
+    __ieee_arithmetic_MOD_ieee_support_denormal_noarg;
+    __ieee_arithmetic_MOD_ieee_support_divide_4;
+    __ieee_arithmetic_MOD_ieee_support_divide_8;
+    __ieee_arithmetic_MOD_ieee_support_divide_10;
+    __ieee_arithmetic_MOD_ieee_support_divide_16;
+    __ieee_arithmetic_MOD_ieee_support_divide_noarg;
+    __ieee_arithmetic_MOD_ieee_support_inf_4;
+    __ieee_arithmetic_MOD_ieee_support_inf_8;
+    __ieee_arithmetic_MOD_ieee_support_inf_10;
+    __ieee_arithmetic_MOD_ieee_support_inf_16;
+    __ieee_arithmetic_MOD_ieee_support_inf_noarg;
+    __ieee_arithmetic_MOD_ieee_support_io_4;
+    __ieee_arithmetic_MOD_ieee_support_io_8;
+    __ieee_arithmetic_MOD_ieee_support_io_10;
+    __ieee_arithmetic_MOD_ieee_support_io_16;
+    __ieee_arithmetic_MOD_ieee_support_io_noarg;
+    __ieee_arithmetic_MOD_ieee_support_nan_4;
+    __ieee_arithmetic_MOD_ieee_support_nan_8;
+    __ieee_arithmetic_MOD_ieee_support_nan_10;
+    __ieee_arithmetic_MOD_ieee_support_nan_16;
+    __ieee_arithmetic_MOD_ieee_support_nan_noarg;
+    __ieee_arithmetic_MOD_ieee_support_rounding_4;
+    __ieee_arithmetic_MOD_ieee_support_rounding_8;
+    __ieee_arithmetic_MOD_ieee_support_rounding_10;
+    __ieee_arithmetic_MOD_ieee_support_rounding_16;
+    __ieee_arithmetic_MOD_ieee_support_rounding_noarg;
+    __ieee_arithmetic_MOD_ieee_support_sqrt_4;
+    __ieee_arithmetic_MOD_ieee_support_sqrt_8;
+    __ieee_arithmetic_MOD_ieee_support_sqrt_10;
+    __ieee_arithmetic_MOD_ieee_support_sqrt_16;
+    __ieee_arithmetic_MOD_ieee_support_sqrt_noarg;
+    __ieee_arithmetic_MOD_ieee_support_standard_4;
+    __ieee_arithmetic_MOD_ieee_support_standard_8;
+    __ieee_arithmetic_MOD_ieee_support_standard_10;
+    __ieee_arithmetic_MOD_ieee_support_standard_16;
+    __ieee_arithmetic_MOD_ieee_support_standard_noarg;
+    __ieee_arithmetic_MOD_ieee_support_underflow_control_4;
+    __ieee_arithmetic_MOD_ieee_support_underflow_control_8;
+    __ieee_arithmetic_MOD_ieee_support_underflow_control_10;
+    __ieee_arithmetic_MOD_ieee_support_underflow_control_16;
+    __ieee_arithmetic_MOD_ieee_support_underflow_control_noarg;
+    __ieee_arithmetic_MOD_ieee_value_4;
+    __ieee_arithmetic_MOD_ieee_value_8;
+    __ieee_exceptions_MOD_ieee_all;
+    __ieee_exceptions_MOD_ieee_get_flag;
+    __ieee_exceptions_MOD_ieee_get_halting_mode;
+    __ieee_exceptions_MOD_ieee_get_status;
+    __ieee_exceptions_MOD_ieee_set_flag;
+    __ieee_exceptions_MOD_ieee_set_halting_mode;
+    __ieee_exceptions_MOD_ieee_set_status;
+    __ieee_exceptions_MOD_ieee_support_flag_4;
+    __ieee_exceptions_MOD_ieee_support_flag_8;
+    __ieee_exceptions_MOD_ieee_support_flag_noarg;
+    __ieee_exceptions_MOD_ieee_support_halting;
+    __ieee_exceptions_MOD_ieee_usual;
+} GFORTRAN_1.5; 
+
 F2C_1.0 {
   global:
     _gfortran_f2c_specific__abs_c4;

libgfortran/ieee/ieee_arithmetic.F90

@@ -0,0 +1,817 @@
+!    Implementation of the IEEE_ARITHMETIC standard intrinsic module
+!    Copyright (C) 2013 Free Software Foundation, Inc.
+!    Contributed by Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>
+! 
+! This file is part of the GNU Fortran runtime library (libgfortran).
+! 
+! Libgfortran is free software; you can redistribute it and/or
+! modify it under the terms of the GNU General Public
+! License as published by the Free Software Foundation; either
+! version 3 of the License, or (at your option) any later version.
+! 
+! Libgfortran is distributed in the hope that it will be useful,
+! but WITHOUT ANY WARRANTY; without even the implied warranty of
+! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+! GNU General Public License for more details.
+! 
+! Under Section 7 of GPL version 3, you are granted additional
+! permissions described in the GCC Runtime Library Exception, version
+! 3.1, as published by the Free Software Foundation.
+! 
+! You should have received a copy of the GNU General Public License and
+! a copy of the GCC Runtime Library Exception along with this program;
+! see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+! <http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "kinds.inc"
+#include "c99_protos.inc"
+#include "fpu-target.inc"
+
+module IEEE_ARITHMETIC
+
+  use IEEE_EXCEPTIONS
+  implicit none
+  private
+
+  ! Every public symbol from IEEE_EXCEPTIONS must be made public here
+  public :: IEEE_FLAG_TYPE, IEEE_INVALID, IEEE_OVERFLOW, &
+    IEEE_DIVIDE_BY_ZERO, IEEE_UNDERFLOW, IEEE_INEXACT, IEEE_USUAL, &
+    IEEE_ALL, IEEE_STATUS_TYPE, IEEE_GET_FLAG, IEEE_GET_HALTING_MODE, &
+    IEEE_GET_STATUS, IEEE_SET_FLAG, IEEE_SET_HALTING_MODE, &
+    IEEE_SET_STATUS, IEEE_SUPPORT_FLAG, IEEE_SUPPORT_HALTING
+
+  ! Derived types and named constants
+
+  type, public :: IEEE_CLASS_TYPE
+    private
+    integer :: hidden
+  end type
+
+  type(IEEE_CLASS_TYPE), parameter, public :: &
+    IEEE_OTHER_VALUE       = IEEE_CLASS_TYPE(0), &
+    IEEE_SIGNALING_NAN     = IEEE_CLASS_TYPE(1), &
+    IEEE_QUIET_NAN         = IEEE_CLASS_TYPE(2), &
+    IEEE_NEGATIVE_INF      = IEEE_CLASS_TYPE(3), &
+    IEEE_NEGATIVE_NORMAL   = IEEE_CLASS_TYPE(4), &
+    IEEE_NEGATIVE_DENORMAL = IEEE_CLASS_TYPE(5), &
+    IEEE_NEGATIVE_ZERO     = IEEE_CLASS_TYPE(6), &
+    IEEE_POSITIVE_ZERO     = IEEE_CLASS_TYPE(7), &
+    IEEE_POSITIVE_DENORMAL = IEEE_CLASS_TYPE(8), &
+    IEEE_POSITIVE_NORMAL   = IEEE_CLASS_TYPE(9), &
+    IEEE_POSITIVE_INF      = IEEE_CLASS_TYPE(10)
+
+  type, public :: IEEE_ROUND_TYPE
+    private
+    integer :: hidden
+  end type
+
+  type(IEEE_ROUND_TYPE), parameter, public :: &
+    IEEE_NEAREST           = IEEE_ROUND_TYPE(GFC_FPE_TONEAREST), &
+    IEEE_TO_ZERO           = IEEE_ROUND_TYPE(GFC_FPE_TOWARDZERO), &
+    IEEE_UP                = IEEE_ROUND_TYPE(GFC_FPE_UPWARD), &
+    IEEE_DOWN              = IEEE_ROUND_TYPE(GFC_FPE_DOWNWARD), &
+    IEEE_OTHER             = IEEE_ROUND_TYPE(0)
+
+
+  ! Equality operators on the derived types
+  interface operator (==)
+    module procedure IEEE_CLASS_TYPE_EQ, IEEE_ROUND_TYPE_EQ
+  end interface
+  public :: operator(==)
+
+  interface operator (/=)
+    module procedure IEEE_CLASS_TYPE_NE, IEEE_ROUND_TYPE_NE
+  end interface
+  public :: operator (/=)
+
+
+  ! IEEE_IS_FINITE
+
+  interface
+    elemental logical function _gfortran_ieee_is_finite_4(X)
+      real(kind=4), intent(in) :: X
+    end function
+    elemental logical function _gfortran_ieee_is_finite_8(X)
+      real(kind=8), intent(in) :: X
+    end function
+  end interface
+
+  interface IEEE_IS_FINITE
+    procedure _gfortran_ieee_is_finite_4, _gfortran_ieee_is_finite_8
+  end interface
+  public :: IEEE_IS_FINITE
+
+  ! IEEE_IS_NAN
+
+  interface
+    elemental logical function _gfortran_ieee_is_nan_4(X)
+      real(kind=4), intent(in) :: X
+    end function
+    elemental logical function _gfortran_ieee_is_nan_8(X)
+      real(kind=8), intent(in) :: X
+    end function
+  end interface
+
+  interface IEEE_IS_NAN
+    procedure _gfortran_ieee_is_nan_4, _gfortran_ieee_is_nan_8
+  end interface
+  public :: IEEE_IS_NAN
+
+  ! IEEE_IS_NEGATIVE
+
+  interface
+    elemental logical function _gfortran_ieee_is_negative_4(X)
+      real(kind=4), intent(in) :: X
+    end function
+    elemental logical function _gfortran_ieee_is_negative_8(X)
+      real(kind=8), intent(in) :: X
+    end function
+  end interface
+
+  interface IEEE_IS_NEGATIVE
+    procedure _gfortran_ieee_is_negative_4, _gfortran_ieee_is_negative_8
+  end interface
+  public :: IEEE_IS_NEGATIVE
+
+  ! IEEE_IS_NORMAL
+
+  interface
+    elemental logical function _gfortran_ieee_is_normal_4(X)
+      real(kind=4), intent(in) :: X
+    end function
+    elemental logical function _gfortran_ieee_is_normal_8(X)
+      real(kind=8), intent(in) :: X
+    end function
+  end interface
+
+  interface IEEE_IS_NORMAL
+    procedure _gfortran_ieee_is_normal_4, _gfortran_ieee_is_normal_8
+  end interface
+  public :: IEEE_IS_NORMAL
+
+  ! IEEE_COPY_SIGN
+
+  interface
+    elemental real(kind=4) function _gfortran_ieee_copy_sign_4_4 (X,Y)
+      real(kind=4), intent(in) :: X
+      real(kind=4), intent(in) :: Y
+    end function
+    elemental real(kind=4) function _gfortran_ieee_copy_sign_4_8 (X,Y)
+      real(kind=4), intent(in) :: X
+      real(kind=8), intent(in) :: Y
+    end function
+    elemental real(kind=8) function _gfortran_ieee_copy_sign_8_4 (X,Y)
+      real(kind=8), intent(in) :: X
+      real(kind=4), intent(in) :: Y
+    end function
+    elemental real(kind=8) function _gfortran_ieee_copy_sign_8_8 (X,Y)
+      real(kind=8), intent(in) :: X
+      real(kind=8), intent(in) :: Y
+    end function
+  end interface
+
+  interface IEEE_COPY_SIGN
+    procedure _gfortran_ieee_copy_sign_4_4, _gfortran_ieee_copy_sign_4_8, &
+              _gfortran_ieee_copy_sign_8_4, _gfortran_ieee_copy_sign_8_8
+  end interface
+  public :: IEEE_COPY_SIGN
+
+  ! IEEE_UNORDERED
+
+  interface
+    elemental logical function _gfortran_ieee_unordered_4_4 (X,Y)
+      real(kind=4), intent(in) :: X
+      real(kind=4), intent(in) :: Y
+    end function
+    elemental logical function _gfortran_ieee_unordered_4_8 (X,Y)
+      real(kind=4), intent(in) :: X
+      real(kind=8), intent(in) :: Y
+    end function
+    elemental logical function _gfortran_ieee_unordered_8_4 (X,Y)
+      real(kind=8), intent(in) :: X
+      real(kind=4), intent(in) :: Y
+    end function
+    elemental logical function _gfortran_ieee_unordered_8_8 (X,Y)
+      real(kind=8), intent(in) :: X
+      real(kind=8), intent(in) :: Y
+    end function
+  end interface
+
+  interface IEEE_UNORDERED
+    procedure _gfortran_ieee_unordered_4_4, _gfortran_ieee_unordered_4_8, &
+              _gfortran_ieee_unordered_8_4, _gfortran_ieee_unordered_8_8
+  end interface
+  public :: IEEE_UNORDERED
+
+  ! IEEE_LOGB
+
+  interface
+    elemental real(kind=4) function _gfortran_ieee_logb_4 (X)
+      real(kind=4), intent(in) :: X
+    end function
+    elemental real(kind=8) function _gfortran_ieee_logb_8 (X)
+      real(kind=8), intent(in) :: X
+    end function
+  end interface
+
+  interface IEEE_LOGB
+    procedure _gfortran_ieee_logb_4, _gfortran_ieee_logb_8
+  end interface
+  public :: IEEE_LOGB
+
+  ! IEEE_NEXT_AFTER
+
+  interface
+    elemental real(kind=4) function _gfortran_ieee_next_after_4_4 (X, Y)
+      real(kind=4), intent(in) :: X
+      real(kind=4), intent(in) :: Y
+    end function
+    elemental real(kind=4) function _gfortran_ieee_next_after_4_8 (X, Y)
+      real(kind=4), intent(in) :: X
+      real(kind=8), intent(in) :: Y
+    end function
+    elemental real(kind=8) function _gfortran_ieee_next_after_8_4 (X, Y)
+      real(kind=8), intent(in) :: X
+      real(kind=4), intent(in) :: Y
+    end function
+    elemental real(kind=8) function _gfortran_ieee_next_after_8_8 (X, Y)
+      real(kind=8), intent(in) :: X
+      real(kind=8), intent(in) :: Y
+    end function
+  end interface
+
+  interface IEEE_NEXT_AFTER
+    procedure _gfortran_ieee_next_after_4_4, _gfortran_ieee_next_after_4_8, &
+              _gfortran_ieee_next_after_8_4, _gfortran_ieee_next_after_8_8
+  end interface
+  public :: IEEE_NEXT_AFTER
+
+  ! IEEE_REM
+
+  interface
+    elemental real(kind=4) function _gfortran_ieee_rem_4_4 (X, Y)
+      real(kind=4), intent(in) :: X
+      real(kind=4), intent(in) :: Y
+    end function
+    elemental real(kind=8) function _gfortran_ieee_rem_4_8 (X, Y)
+      real(kind=4), intent(in) :: X
+      real(kind=8), intent(in) :: Y
+    end function
+    elemental real(kind=8) function _gfortran_ieee_rem_8_4 (X, Y)
+      real(kind=8), intent(in) :: X
+      real(kind=4), intent(in) :: Y
+    end function
+    elemental real(kind=8) function _gfortran_ieee_rem_8_8 (X, Y)
+      real(kind=8), intent(in) :: X
+      real(kind=8), intent(in) :: Y
+    end function
+  end interface
+
+  interface IEEE_REM
+    procedure _gfortran_ieee_rem_4_4, _gfortran_ieee_rem_4_8, &
+              _gfortran_ieee_rem_8_4, _gfortran_ieee_rem_8_8
+  end interface
+  public :: IEEE_REM
+
+  ! IEEE_RINT
+
+  interface
+    elemental real(kind=4) function _gfortran_ieee_rint_4 (X)
+      real(kind=4), intent(in) :: X
+    end function
+    elemental real(kind=8) function _gfortran_ieee_rint_8 (X)
+      real(kind=8), intent(in) :: X
+    end function
+  end interface
+
+  interface IEEE_RINT
+    procedure _gfortran_ieee_rint_4, _gfortran_ieee_rint_8
+  end interface
+  public :: IEEE_RINT
+
+  ! IEEE_SCALB
+
+  interface
+    elemental real(kind=4) function _gfortran_ieee_scalb_4 (X, I)
+      real(kind=4), intent(in) :: X
+      integer, intent(in) :: I
+    end function
+    elemental real(kind=8) function _gfortran_ieee_scalb_8 (X, I)
+      real(kind=8), intent(in) :: X
+      integer, intent(in) :: I
+    end function
+  end interface
+
+  interface IEEE_SCALB
+    procedure _gfortran_ieee_scalb_4, _gfortran_ieee_scalb_8
+  end interface
+  public :: IEEE_SCALB
+
+  ! IEEE_VALUE
+
+  interface IEEE_VALUE
+    module procedure IEEE_VALUE_4, IEEE_VALUE_8
+  end interface
+  public :: IEEE_VALUE
+
+  ! IEEE_CLASS
+
+  interface IEEE_CLASS
+    module procedure IEEE_CLASS_4, IEEE_CLASS_8
+  end interface
+  public :: IEEE_CLASS
+
+  ! Public declarations for contained procedures
+  public :: IEEE_GET_ROUNDING_MODE, IEEE_SET_ROUNDING_MODE
+  public :: IEEE_GET_UNDERFLOW_MODE, IEEE_SET_UNDERFLOW_MODE
+  public :: IEEE_SELECTED_REAL_KIND
+
+  ! IEEE_SUPPORT_ROUNDING
+
+  interface IEEE_SUPPORT_ROUNDING
+    module procedure IEEE_SUPPORT_ROUNDING_4, IEEE_SUPPORT_ROUNDING_8, &
+#ifdef HAVE_GFC_REAL_10
+                     IEEE_SUPPORT_ROUNDING_10, &
+#endif
+#ifdef HAVE_GFC_REAL_16
+                     IEEE_SUPPORT_ROUNDING_16, &
+#endif
+                     IEEE_SUPPORT_ROUNDING_NOARG
+  end interface
+  public :: IEEE_SUPPORT_ROUNDING
+  
+  ! Interface to the FPU-specific function
+  interface
+    pure integer function support_rounding_helper(flag) &
+        bind(c, name="_gfortrani_support_fpu_rounding_mode")
+      integer, intent(in), value :: flag
+    end function
+  end interface
+
+! IEEE_SUPPORT_* generic functions
+
+#if defined(HAVE_GFC_REAL_10) && defined(HAVE_GFC_REAL_16)
+# define MACRO1(NAME) NAME/**/_4, NAME/**/_8, NAME/**/_10, NAME/**/_16, NAME/**/_NOARG
+#elif defined(HAVE_GFC_REAL_10)
+# define MACRO1(NAME) NAME/**/_4, NAME/**/_8, NAME/**/_10, NAME/**/_NOARG
+#elif defined(HAVE_GFC_REAL_16)
+# define MACRO1(NAME) NAME/**/_4, NAME/**/_8, NAME/**/_16, NAME/**/_NOARG
+#else
+# define MACRO1(NAME) NAME/**/_4, NAME/**/_8, NAME/**/_NOARG
+#endif
+
+#define SUPPORTGENERIC(NAME) \
+  interface NAME ; module procedure MACRO1(NAME) ; end interface ; \
+  public :: NAME
+
+SUPPORTGENERIC(IEEE_SUPPORT_DATATYPE)
+SUPPORTGENERIC(IEEE_SUPPORT_DENORMAL)
+SUPPORTGENERIC(IEEE_SUPPORT_DIVIDE)
+SUPPORTGENERIC(IEEE_SUPPORT_INF)
+SUPPORTGENERIC(IEEE_SUPPORT_IO)
+SUPPORTGENERIC(IEEE_SUPPORT_NAN)
+SUPPORTGENERIC(IEEE_SUPPORT_SQRT)
+SUPPORTGENERIC(IEEE_SUPPORT_STANDARD)
+SUPPORTGENERIC(IEEE_SUPPORT_UNDERFLOW_CONTROL)
+
+contains
+
+  ! Equality operators for IEEE_CLASS_TYPE and IEEE_ROUNDING_MODE
+  elemental logical function IEEE_CLASS_TYPE_EQ (X, Y) result(res)
+    implicit none
+    type(IEEE_CLASS_TYPE), intent(in) :: X, Y
+    res = (X%hidden == Y%hidden)
+  end function
+
+  elemental logical function IEEE_CLASS_TYPE_NE (X, Y) result(res)
+    implicit none
+    type(IEEE_CLASS_TYPE), intent(in) :: X, Y
+    res = (X%hidden /= Y%hidden)
+  end function
+
+  elemental logical function IEEE_ROUND_TYPE_EQ (X, Y) result(res)
+    implicit none
+    type(IEEE_ROUND_TYPE), intent(in) :: X, Y
+    res = (X%hidden == Y%hidden)
+  end function
+
+  elemental logical function IEEE_ROUND_TYPE_NE (X, Y) result(res)
+    implicit none
+    type(IEEE_ROUND_TYPE), intent(in) :: X, Y
+    res = (X%hidden /= Y%hidden)
+  end function
+
+  ! IEEE_SELECTED_REAL_KIND
+  integer function IEEE_SELECTED_REAL_KIND (P, R, RADIX) result(res)
+    implicit none
+    integer, intent(in), optional :: P, R, RADIX
+    integer :: p2, r2
+
+    p2 = 0 ; r2 = 0
+    if (present(p)) p2 = p
+    if (present(r)) r2 = r
+
+    ! The only IEEE types we support right now are binary
+    if (present(radix)) then
+      if (radix /= 2) then
+        res = -5
+        return
+      endif
+    endif
+
+    ! Does IEEE float fit?
+    if (precision(0.) >= p2 .and. range(0.) >= r2) then
+      res = kind(0.)
+      return
+    endif
+
+    ! Does IEEE double fit?
+    if (precision(0.d0) >= p2 .and. range(0.d0) >= r2) then
+      res = kind(0.d0)
+      return
+    endif
+
+    if (precision(0.d0) < p2 .and. range(0.d0) < r2) then
+      res = -3
+      return
+    endif
+
+    if (precision(0.d0) < p2) then
+      res = -1
+      return
+    endif
+
+   res = -2
+  end function
+
+
+  ! IEEE_CLASS
+
+  elemental function IEEE_CLASS_4 (X) result(res)
+    implicit none
+    real(kind=4), intent(in) :: X
+    type(IEEE_CLASS_TYPE) :: res
+
+    interface
+      pure integer function _gfortrani_ieee_class_helper_4(val)
+        real(kind=4), intent(in) :: val
+      end function
+    end interface
+
+    res = IEEE_CLASS_TYPE(_gfortrani_ieee_class_helper_4(X))
+  end function
+
+  elemental function IEEE_CLASS_8 (X) result(res)
+    implicit none
+    real(kind=8), intent(in) :: X
+    type(IEEE_CLASS_TYPE) :: res
+
+    interface
+      pure integer function _gfortrani_ieee_class_helper_8(val)
+        real(kind=8), intent(in) :: val
+      end function
+    end interface
+
+    res = IEEE_CLASS_TYPE(_gfortrani_ieee_class_helper_8(X))
+  end function
+
+  ! IEEE_VALUE
+
+  elemental real(kind=4) function IEEE_VALUE_4(X, C) result(res)
+    implicit none
+    real(kind=4), intent(in) :: X
+    type(IEEE_CLASS_TYPE), intent(in) :: C
+
+    select case (C%hidden)
+      case (1)     ! IEEE_SIGNALING_NAN
+        res = -1
+        res = sqrt(res)
+      case (2)     ! IEEE_QUIET_NAN
+        res = -1
+        res = sqrt(res)
+      case (3)     ! IEEE_NEGATIVE_INF
+        res = huge(res)
+        res = (-res) * res
+      case (4)     ! IEEE_NEGATIVE_NORMAL
+        res = -42
+      case (5)     ! IEEE_NEGATIVE_DENORMAL
+        res = -tiny(res)
+        res = res / 2
+      case (6)     ! IEEE_NEGATIVE_ZERO
+        res = 0
+        res = -res
+      case (7)     ! IEEE_POSITIVE_ZERO
+        res = 0
+      case (8)     ! IEEE_POSITIVE_DENORMAL
+        res = tiny(res)
+        res = res / 2
+      case (9)     ! IEEE_POSITIVE_NORMAL
+        res = 42
+      case (10)    ! IEEE_POSITIVE_INF
+        res = huge(res)
+        res = res * res
+      case default ! IEEE_OTHER_VALUE, should not happen
+        res = 0
+     end select
+  end function
+
+  elemental real(kind=8) function IEEE_VALUE_8(X, C) result(res)
+    implicit none
+    real(kind=8), intent(in) :: X
+    type(IEEE_CLASS_TYPE), intent(in) :: C
+
+    select case (C%hidden)
+      case (1)     ! IEEE_SIGNALING_NAN
+        res = -1
+        res = sqrt(res)
+      case (2)     ! IEEE_QUIET_NAN
+        res = -1
+        res = sqrt(res)
+      case (3)     ! IEEE_NEGATIVE_INF
+        res = huge(res)
+        res = (-res) * res
+      case (4)     ! IEEE_NEGATIVE_NORMAL
+        res = -42
+      case (5)     ! IEEE_NEGATIVE_DENORMAL
+        res = -tiny(res)
+        res = res / 2
+      case (6)     ! IEEE_NEGATIVE_ZERO
+        res = 0
+        res = -res
+      case (7)     ! IEEE_POSITIVE_ZERO
+        res = 0
+      case (8)     ! IEEE_POSITIVE_DENORMAL
+        res = tiny(res)
+        res = res / 2
+      case (9)     ! IEEE_POSITIVE_NORMAL
+        res = 42
+      case (10)    ! IEEE_POSITIVE_INF
+        res = huge(res)
+        res = res * res
+      case default ! IEEE_OTHER_VALUE, should not happen
+        res = 0
+     end select
+  end function
+
+
+  ! IEEE_GET_ROUNDING_MODE
+
+  subroutine IEEE_GET_ROUNDING_MODE (ROUND_VALUE)
+    implicit none
+    type(IEEE_ROUND_TYPE), intent(out) :: ROUND_VALUE
+    integer :: i
+
+    interface
+      integer function helper() &
+        bind(c, name="_gfortrani_get_fpu_rounding_mode")
+      end function
+    end interface
+
+    ! FIXME: Use intermediate variable i to avoid triggering PR59023
+    i = helper()
+    ROUND_VALUE = IEEE_ROUND_TYPE(i)
+  end subroutine
+
+
+  ! IEEE_SET_ROUNDING_MODE
+
+  subroutine IEEE_SET_ROUNDING_MODE (ROUND_VALUE)
+    implicit none
+    type(IEEE_ROUND_TYPE), intent(in) :: ROUND_VALUE
+
+    interface
+      subroutine helper(val) &
+          bind(c, name="_gfortrani_set_fpu_rounding_mode")
+        integer, value :: val
+      end subroutine
+    end interface
+    
+    call helper(ROUND_VALUE%hidden)
+  end subroutine
+
+
+  ! IEEE_GET_UNDERFLOW_MODE
+
+  subroutine IEEE_GET_UNDERFLOW_MODE (GRADUAL)
+    implicit none
+    logical, intent(out) :: GRADUAL
+    ! We do not support getting/setting underflow mode yet. We still
+    ! provide the procedures to avoid link-time error if a user program
+    ! uses it protected by a call to IEEE_SUPPORT_UNDERFLOW_CONTROL
+    call abort
+  end subroutine
+
+
+  ! IEEE_SET_UNDERFLOW_MODE
+
+  subroutine IEEE_SET_UNDERFLOW_MODE (GRADUAL)
+    implicit none
+    logical, intent(in) :: GRADUAL
+    ! We do not support getting/setting underflow mode yet. We still
+    ! provide the procedures to avoid link-time error if a user program
+    ! uses it protected by a call to IEEE_SUPPORT_UNDERFLOW_CONTROL
+    call abort
+  end subroutine
+
+! IEEE_SUPPORT_ROUNDING
+
+  pure logical function IEEE_SUPPORT_ROUNDING_4 (ROUND_VALUE, X) result(res)
+    implicit none
+    real(kind=4), intent(in) :: X
+    type(IEEE_ROUND_TYPE), intent(in) :: ROUND_VALUE
+    res = (support_rounding_helper(ROUND_VALUE%hidden) /= 0)
+  end function
+
+  pure logical function IEEE_SUPPORT_ROUNDING_8 (ROUND_VALUE, X) result(res)
+    implicit none
+    real(kind=8), intent(in) :: X
+    type(IEEE_ROUND_TYPE), intent(in) :: ROUND_VALUE
+    res = (support_rounding_helper(ROUND_VALUE%hidden) /= 0)
+  end function
+
+#ifdef HAVE_GFC_REAL_10
+  pure logical function IEEE_SUPPORT_ROUNDING_10 (ROUND_VALUE, X) result(res)
+    implicit none
+    real(kind=10), intent(in) :: X
+    type(IEEE_ROUND_TYPE), intent(in) :: ROUND_VALUE
+    res = .false.
+  end function
+#endif
+
+#ifdef HAVE_GFC_REAL_16
+  pure logical function IEEE_SUPPORT_ROUNDING_16 (ROUND_VALUE, X) result(res)
+    implicit none
+    real(kind=16), intent(in) :: X
+    type(IEEE_ROUND_TYPE), intent(in) :: ROUND_VALUE
+    res = .false.
+  end function
+#endif
+
+  pure logical function IEEE_SUPPORT_ROUNDING_NOARG (ROUND_VALUE) result(res)
+    implicit none
+    type(IEEE_ROUND_TYPE), intent(in) :: ROUND_VALUE
+#if defined(HAVE_GFC_REAL_10) || defined(HAVE_GFC_REAL_16)
+    res = .false.
+#else
+    res = (support_rounding_helper(ROUND_VALUE%hidden) /= 0)
+#endif
+  end function
+
+! IEEE_SUPPORT_* functions
+
+#define SUPPORTMACRO(NAME, INTKIND, VALUE) \
+  pure logical function NAME/**/_/**/INTKIND (X) result(res) ; \
+    implicit none                                            ; \
+    real(INTKIND), intent(in) :: X(..)                       ; \
+    res = VALUE                                              ; \
+  end function
+
+#define SUPPORTMACRO_NOARG(NAME, VALUE) \
+  pure logical function NAME/**/_NOARG () result(res) ; \
+    implicit none                                     ; \
+    res = VALUE                                       ; \
+  end function
+
+! IEEE_SUPPORT_DATATYPE
+
+SUPPORTMACRO(IEEE_SUPPORT_DATATYPE,4,.true.)
+SUPPORTMACRO(IEEE_SUPPORT_DATATYPE,8,.true.)
+#ifdef HAVE_GFC_REAL_10
+SUPPORTMACRO(IEEE_SUPPORT_DATATYPE,10,.false.)
+#endif
+#ifdef HAVE_GFC_REAL_16
+SUPPORTMACRO(IEEE_SUPPORT_DATATYPE,16,.false.)
+#endif
+#if defined(HAVE_GFC_REAL_10) || defined(HAVE_GFC_REAL_16)
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_DATATYPE,.false.)
+#else
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_DATATYPE,.true.)
+#endif
+
+! IEEE_SUPPORT_DENORMAL
+
+SUPPORTMACRO(IEEE_SUPPORT_DENORMAL,4,.true.)
+SUPPORTMACRO(IEEE_SUPPORT_DENORMAL,8,.true.)
+#ifdef HAVE_GFC_REAL_10
+SUPPORTMACRO(IEEE_SUPPORT_DENORMAL,10,.false.)
+#endif
+#ifdef HAVE_GFC_REAL_16
+SUPPORTMACRO(IEEE_SUPPORT_DENORMAL,16,.false.)
+#endif
+#if defined(HAVE_GFC_REAL_10) || defined(HAVE_GFC_REAL_16)
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_DENORMAL,.false.)
+#else
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_DENORMAL,.true.)
+#endif
+
+! IEEE_SUPPORT_DIVIDE
+
+SUPPORTMACRO(IEEE_SUPPORT_DIVIDE,4,.true.)
+SUPPORTMACRO(IEEE_SUPPORT_DIVIDE,8,.true.)
+#ifdef HAVE_GFC_REAL_10
+SUPPORTMACRO(IEEE_SUPPORT_DIVIDE,10,.false.)
+#endif
+#ifdef HAVE_GFC_REAL_16
+SUPPORTMACRO(IEEE_SUPPORT_DIVIDE,16,.false.)
+#endif
+#if defined(HAVE_GFC_REAL_10) || defined(HAVE_GFC_REAL_16)
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_DIVIDE,.false.)
+#else
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_DIVIDE,.true.)
+#endif
+
+! IEEE_SUPPORT_INF
+
+SUPPORTMACRO(IEEE_SUPPORT_INF,4,.true.)
+SUPPORTMACRO(IEEE_SUPPORT_INF,8,.true.)
+#ifdef HAVE_GFC_REAL_10
+SUPPORTMACRO(IEEE_SUPPORT_INF,10,.false.)
+#endif
+#ifdef HAVE_GFC_REAL_16
+SUPPORTMACRO(IEEE_SUPPORT_INF,16,.false.)
+#endif
+#if defined(HAVE_GFC_REAL_10) || defined(HAVE_GFC_REAL_16)
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_INF,.false.)
+#else
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_INF,.true.)
+#endif
+
+! IEEE_SUPPORT_IO
+
+SUPPORTMACRO(IEEE_SUPPORT_IO,4,.true.)
+SUPPORTMACRO(IEEE_SUPPORT_IO,8,.true.)
+#ifdef HAVE_GFC_REAL_10
+SUPPORTMACRO(IEEE_SUPPORT_IO,10,.false.)
+#endif
+#ifdef HAVE_GFC_REAL_16
+SUPPORTMACRO(IEEE_SUPPORT_IO,16,.false.)
+#endif
+#if defined(HAVE_GFC_REAL_10) || defined(HAVE_GFC_REAL_16)
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_IO,.false.)
+#else
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_IO,.true.)
+#endif
+
+! IEEE_SUPPORT_NAN
+
+SUPPORTMACRO(IEEE_SUPPORT_NAN,4,.true.)
+SUPPORTMACRO(IEEE_SUPPORT_NAN,8,.true.)
+#ifdef HAVE_GFC_REAL_10
+SUPPORTMACRO(IEEE_SUPPORT_NAN,10,.false.)
+#endif
+#ifdef HAVE_GFC_REAL_16
+SUPPORTMACRO(IEEE_SUPPORT_NAN,16,.false.)
+#endif
+#if defined(HAVE_GFC_REAL_10) || defined(HAVE_GFC_REAL_16)
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_NAN,.false.)
+#else
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_NAN,.true.)
+#endif
+
+! IEEE_SUPPORT_SQRT
+
+SUPPORTMACRO(IEEE_SUPPORT_SQRT,4,.true.)
+SUPPORTMACRO(IEEE_SUPPORT_SQRT,8,.true.)
+#ifdef HAVE_GFC_REAL_10
+SUPPORTMACRO(IEEE_SUPPORT_SQRT,10,.false.)
+#endif
+#ifdef HAVE_GFC_REAL_16
+SUPPORTMACRO(IEEE_SUPPORT_SQRT,16,.false.)
+#endif
+#if defined(HAVE_GFC_REAL_10) || defined(HAVE_GFC_REAL_16)
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_SQRT,.false.)
+#else
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_SQRT,.true.)
+#endif
+
+! IEEE_SUPPORT_STANDARD
+
+SUPPORTMACRO(IEEE_SUPPORT_STANDARD,4,.true.)
+SUPPORTMACRO(IEEE_SUPPORT_STANDARD,8,.true.)
+#ifdef HAVE_GFC_REAL_10
+SUPPORTMACRO(IEEE_SUPPORT_STANDARD,10,.false.)
+#endif
+#ifdef HAVE_GFC_REAL_16
+SUPPORTMACRO(IEEE_SUPPORT_STANDARD,16,.false.)
+#endif
+#if defined(HAVE_GFC_REAL_10) || defined(HAVE_GFC_REAL_16)
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_STANDARD,.false.)
+#else
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_STANDARD,.true.)
+#endif
+
+! IEEE_SUPPORT_UNDERFLOW_CONTROL
+
+SUPPORTMACRO(IEEE_SUPPORT_UNDERFLOW_CONTROL,4,.false.)
+SUPPORTMACRO(IEEE_SUPPORT_UNDERFLOW_CONTROL,8,.false.)
+#ifdef HAVE_GFC_REAL_10
+SUPPORTMACRO(IEEE_SUPPORT_UNDERFLOW_CONTROL,10,.false.)
+#endif
+#ifdef HAVE_GFC_REAL_16
+SUPPORTMACRO(IEEE_SUPPORT_UNDERFLOW_CONTROL,16,.false.)
+#endif
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_UNDERFLOW_CONTROL,.false.)
+
+
+end module IEEE_ARITHMETIC

libgfortran/ieee/ieee_exceptions.F90

@@ -0,0 +1,218 @@
+!    Implementation of the IEEE_EXCEPTIONS standard intrinsic module
+!    Copyright (C) 2013 Free Software Foundation, Inc.
+!    Contributed by Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>
+! 
+! This file is part of the GNU Fortran runtime library (libgfortran).
+! 
+! Libgfortran is free software; you can redistribute it and/or
+! modify it under the terms of the GNU General Public
+! License as published by the Free Software Foundation; either
+! version 3 of the License, or (at your option) any later version.
+! 
+! Libgfortran is distributed in the hope that it will be useful,
+! but WITHOUT ANY WARRANTY; without even the implied warranty of
+! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+! GNU General Public License for more details.
+! 
+! Under Section 7 of GPL version 3, you are granted additional
+! permissions described in the GCC Runtime Library Exception, version
+! 3.1, as published by the Free Software Foundation.
+! 
+! You should have received a copy of the GNU General Public License and
+! a copy of the GCC Runtime Library Exception along with this program;
+! see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+! <http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "kinds.inc"
+#include "c99_protos.inc"
+#include "fpu-target.inc"
+
+module IEEE_EXCEPTIONS
+
+  implicit none
+  private
+
+! Derived types and named constants
+
+  type, public :: IEEE_FLAG_TYPE
+    private
+    integer :: hidden
+  end type
+
+  type(IEEE_FLAG_TYPE), parameter, public :: &
+    IEEE_INVALID        = IEEE_FLAG_TYPE(GFC_FPE_INVALID), &
+    IEEE_OVERFLOW       = IEEE_FLAG_TYPE(GFC_FPE_OVERFLOW), &
+    IEEE_DIVIDE_BY_ZERO = IEEE_FLAG_TYPE(GFC_FPE_ZERO), &
+    IEEE_UNDERFLOW      = IEEE_FLAG_TYPE(GFC_FPE_UNDERFLOW), &
+    IEEE_INEXACT        = IEEE_FLAG_TYPE(GFC_FPE_INEXACT)
+
+  type(IEEE_FLAG_TYPE), parameter, public :: &
+    IEEE_USUAL(3) = [ IEEE_OVERFLOW, IEEE_DIVIDE_BY_ZERO, IEEE_INVALID ], &
+    IEEE_ALL(5)   = [ IEEE_USUAL, IEEE_UNDERFLOW, IEEE_INEXACT ]
+
+  type, public :: IEEE_STATUS_TYPE
+    private
+    character(len=GFC_FPE_STATE_BUFFER_SIZE) :: hidden
+  end type
+
+  interface IEEE_SUPPORT_FLAG
+    module procedure IEEE_SUPPORT_FLAG_NOARG, &
+                     IEEE_SUPPORT_FLAG_4, &
+                     IEEE_SUPPORT_FLAG_8
+  end interface IEEE_SUPPORT_FLAG
+
+  public :: IEEE_SUPPORT_FLAG, IEEE_SUPPORT_HALTING
+  public :: IEEE_SET_HALTING_MODE, IEEE_GET_HALTING_MODE
+  public :: IEEE_SET_FLAG, IEEE_GET_FLAG
+  public :: IEEE_SET_STATUS, IEEE_GET_STATUS
+
+contains
+
+! Saving and restoring floating-point status
+
+  subroutine IEEE_GET_STATUS (STATUS_VALUE)
+    implicit none
+    type(IEEE_STATUS_TYPE), intent(out) :: STATUS_VALUE
+
+    interface
+      subroutine helper(ptr) &
+          bind(c, name="_gfortrani_get_fpu_state")
+        use, intrinsic :: iso_c_binding, only : c_char
+        character(kind=c_char) :: ptr(*)
+      end subroutine
+    end interface
+
+    call helper(STATUS_VALUE%hidden)
+  end subroutine
+
+  subroutine IEEE_SET_STATUS (STATUS_VALUE)
+    implicit none
+    type(IEEE_STATUS_TYPE), intent(in) :: STATUS_VALUE
+
+    interface
+      subroutine helper(ptr) &
+          bind(c, name="_gfortrani_set_fpu_state")
+        use, intrinsic :: iso_c_binding, only : c_char
+        character(kind=c_char) :: ptr(*)
+      end subroutine
+    end interface
+
+    call helper(STATUS_VALUE%hidden)
+  end subroutine
+
+! Getting and setting flags
+
+  elemental subroutine IEEE_GET_FLAG (FLAG, FLAG_VALUE)
+    implicit none
+    type(IEEE_FLAG_TYPE), intent(in) :: FLAG
+    logical, intent(out) :: FLAG_VALUE
+
+    interface
+      pure integer function helper() &
+        bind(c, name="_gfortrani_get_fpu_except_flags")
+      end function
+    end interface
+
+    FLAG_VALUE = (IAND(helper(), FLAG%hidden) /= 0)
+  end subroutine
+
+  elemental subroutine IEEE_SET_FLAG (FLAG, FLAG_VALUE)
+    implicit none
+    type(IEEE_FLAG_TYPE), intent(in) :: FLAG
+    logical, intent(in) :: FLAG_VALUE
+
+    interface
+      pure subroutine helper(set, clear) &
+          bind(c, name="_gfortrani_set_fpu_except_flags")
+        integer, intent(in), value :: set, clear
+      end subroutine
+    end interface
+
+    if (FLAG_VALUE) then
+      call helper(FLAG%hidden, 0)
+    else
+      call helper(0, FLAG%hidden)
+    end if
+  end subroutine
+
+! Querying and changing the halting mode
+
+  elemental subroutine IEEE_GET_HALTING_MODE (FLAG, HALTING)
+    implicit none
+    type(IEEE_FLAG_TYPE), intent(in) :: FLAG
+    logical, intent(out) :: HALTING
+
+    interface
+      pure integer function helper() &
+          bind(c, name="_gfortrani_get_fpu_trap_exceptions")
+      end function
+    end interface
+
+    HALTING = (IAND(helper(), FLAG%hidden) /= 0)
+  end subroutine
+
+  elemental subroutine IEEE_SET_HALTING_MODE (FLAG, HALTING)
+    implicit none
+    type(IEEE_FLAG_TYPE), intent(in) :: FLAG
+    logical, intent(in) :: HALTING
+
+    interface
+      pure subroutine helper(trap, notrap) &
+          bind(c, name="_gfortrani_set_fpu_trap_exceptions")
+        integer, intent(in), value :: trap, notrap
+      end subroutine
+    end interface
+
+    if (HALTING) then
+      call helper(FLAG%hidden, 0)
+    else
+      call helper(0, FLAG%hidden)
+    end if
+  end subroutine
+
+! Querying support
+
+  pure logical function IEEE_SUPPORT_HALTING (FLAG)
+    implicit none
+    type(IEEE_FLAG_TYPE), intent(in) :: FLAG
+
+    interface
+      pure integer function helper(flag) &
+          bind(c, name="_gfortrani_support_fpu_trap")
+        integer, intent(in), value :: flag
+      end function
+    end interface
+
+    IEEE_SUPPORT_HALTING = (helper(FLAG%hidden) /= 0)
+  end function
+
+  pure logical function IEEE_SUPPORT_FLAG_NOARG (FLAG)
+    implicit none
+    type(IEEE_FLAG_TYPE), intent(in) :: FLAG
+
+    interface
+      pure integer function helper(flag) &
+          bind(c, name="_gfortrani_support_fpu_flag")
+        integer, intent(in), value :: flag
+      end function
+    end interface
+
+    IEEE_SUPPORT_FLAG_NOARG = (helper(FLAG%hidden) /= 0)
+  end function
+
+  pure logical function IEEE_SUPPORT_FLAG_4 (FLAG, X) result(res)
+    implicit none
+    type(IEEE_FLAG_TYPE), intent(in) :: FLAG
+    real(kind=4), intent(in) :: X
+    res = IEEE_SUPPORT_FLAG_NOARG(FLAG)
+  end function
+
+  pure logical function IEEE_SUPPORT_FLAG_8 (FLAG, X) result(res)
+    implicit none
+    type(IEEE_FLAG_TYPE), intent(in) :: FLAG
+    real(kind=8), intent(in) :: X
+    res = IEEE_SUPPORT_FLAG_NOARG(FLAG)
+  end function
+
+end module IEEE_EXCEPTIONS

libgfortran/ieee/ieee_features.F90

@@ -0,0 +1,49 @@
+!    Implementation of the IEEE_FEATURES standard intrinsic module
+!    Copyright (C) 2013 Free Software Foundation, Inc.
+!    Contributed by Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>
+! 
+! This file is part of the GNU Fortran runtime library (libgfortran).
+! 
+! Libgfortran is free software; you can redistribute it and/or
+! modify it under the terms of the GNU General Public
+! License as published by the Free Software Foundation; either
+! version 3 of the License, or (at your option) any later version.
+! 
+! Libgfortran is distributed in the hope that it will be useful,
+! but WITHOUT ANY WARRANTY; without even the implied warranty of
+! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+! GNU General Public License for more details.
+! 
+! Under Section 7 of GPL version 3, you are granted additional
+! permissions described in the GCC Runtime Library Exception, version
+! 3.1, as published by the Free Software Foundation.
+! 
+! You should have received a copy of the GNU General Public License and
+! a copy of the GCC Runtime Library Exception along with this program;
+! see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+! <http://www.gnu.org/licenses/>.  */
+
+module IEEE_FEATURES
+
+  implicit none
+  private
+
+  type, public :: IEEE_FEATURES_TYPE
+    private
+    integer :: hidden
+  end type
+
+  type(IEEE_FEATURES_TYPE), parameter, public :: &
+    IEEE_DATATYPE       = IEEE_FEATURES_TYPE(0), &
+    IEEE_DENORMAL       = IEEE_FEATURES_TYPE(1), &
+    IEEE_DIVIDE         = IEEE_FEATURES_TYPE(2), &
+    IEEE_HALTING        = IEEE_FEATURES_TYPE(3), &
+    IEEE_INEXACT_FLAG   = IEEE_FEATURES_TYPE(4), &
+    IEEE_INF            = IEEE_FEATURES_TYPE(5), &
+    IEEE_INVALID_FLAG   = IEEE_FEATURES_TYPE(6), &
+    IEEE_NAN            = IEEE_FEATURES_TYPE(7), &
+    IEEE_ROUNDING       = IEEE_FEATURES_TYPE(8), &
+    IEEE_SQRT           = IEEE_FEATURES_TYPE(9), &
+    IEEE_UNDERFLOW_FLAG = IEEE_FEATURES_TYPE(10)
+
+end module IEEE_FEATURES

libgfortran/ieee/ieee_helper.c

@@ -0,0 +1,407 @@
+/* Helper functions in C for IEEE modules
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   Contributed by Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>
+
+This file is part of the GNU Fortran runtime library (libgfortran).
+
+Libgfortran is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public
+License as published by the Free Software Foundation; either
+version 3 of the License, or (at your option) any later version.
+
+Libgfortran is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include "libgfortran.h"
+
+/* Prototypes.  */
+
+extern int ieee_class_helper_4 (GFC_REAL_4 *);
+internal_proto(ieee_class_helper_4);
+
+extern int ieee_class_helper_8 (GFC_REAL_8 *);
+internal_proto(ieee_class_helper_8);
+
+extern int ieee_is_finite_4_ (GFC_REAL_4 *);
+export_proto(ieee_is_finite_4_);
+
+extern int ieee_is_finite_8_ (GFC_REAL_8 *);
+export_proto(ieee_is_finite_8_);
+
+extern int ieee_is_nan_4_ (GFC_REAL_4 *);
+export_proto(ieee_is_nan_4_);
+
+extern int ieee_is_nan_8_ (GFC_REAL_8 *);
+export_proto(ieee_is_nan_8_);
+
+extern int ieee_is_negative_4_ (GFC_REAL_4 *);
+export_proto(ieee_is_negative_4_);
+
+extern int ieee_is_negative_8_ (GFC_REAL_8 *);
+export_proto(ieee_is_negative_8_);
+
+extern int ieee_is_normal_4_ (GFC_REAL_4 *);
+export_proto(ieee_is_normal_4_);
+
+extern int ieee_is_normal_8_ (GFC_REAL_8 *);
+export_proto(ieee_is_normal_8_);
+
+
+/* Enumeration of the possible floating-point types. These values
+   correspond to the hidden arguments of the IEEE_CLASS_TYPE
+   derived-type of IEEE_ARITHMETIC.  */
+
+enum { IEEE_OTHER_VALUE = 0, IEEE_SIGNALING_NAN, IEEE_QUIET_NAN,
+  IEEE_NEGATIVE_INF, IEEE_NEGATIVE_NORMAL, IEEE_NEGATIVE_DENORMAL,
+  IEEE_NEGATIVE_ZERO, IEEE_POSITIVE_ZERO, IEEE_POSITIVE_DENORMAL,
+  IEEE_POSITIVE_NORMAL, IEEE_POSITIVE_INF };
+
+#define CLASSMACRO(TYPE) \
+  int ieee_class_helper_ ## TYPE (GFC_REAL_ ## TYPE *value) \
+  { \
+    int res = __builtin_fpclassify (IEEE_QUIET_NAN, IEEE_POSITIVE_INF, \
+				    IEEE_POSITIVE_NORMAL, \
+				    IEEE_POSITIVE_DENORMAL, \
+				    IEEE_POSITIVE_ZERO, *value); \
+ \
+    if (__builtin_signbit (*value)) \
+    { \
+      if (res == IEEE_POSITIVE_NORMAL) \
+	return IEEE_NEGATIVE_NORMAL; \
+      else if (res == IEEE_POSITIVE_DENORMAL) \
+	return IEEE_NEGATIVE_DENORMAL; \
+      else if (res == IEEE_POSITIVE_ZERO) \
+	return IEEE_NEGATIVE_ZERO; \
+      else if (res == IEEE_POSITIVE_INF) \
+	return IEEE_NEGATIVE_INF; \
+    } \
+ \
+    if (res == IEEE_QUIET_NAN) \
+    { \
+      /* TODO: Handle signaling NaNs  */ \
+      return res; \
+    } \
+ \
+    return res; \
+  }
+
+CLASSMACRO(4)
+CLASSMACRO(8)
+
+
+/* Testing functions.  */
+
+int ieee_is_finite_4_ (GFC_REAL_4 *val)
+{
+  return __builtin_isfinite(*val) ? 1 : 0;
+}
+
+int ieee_is_finite_8_ (GFC_REAL_8 *val)
+{
+  return __builtin_isfinite(*val) ? 1 : 0;
+}
+
+int ieee_is_nan_4_ (GFC_REAL_4 *val)
+{
+  return __builtin_isnan(*val) ? 1 : 0;
+}
+
+int ieee_is_nan_8_ (GFC_REAL_8 *val)
+{
+  return __builtin_isnan(*val) ? 1 : 0;
+}
+
+int ieee_is_negative_4_ (GFC_REAL_4 *val)
+{
+  return (__builtin_signbit(*val) && !__builtin_isnan(*val)) ? 1 : 0;
+}
+
+int ieee_is_negative_8_ (GFC_REAL_8 *val)
+{
+  return (__builtin_signbit(*val) && !__builtin_isnan(*val)) ? 1 : 0;
+}
+
+int ieee_is_normal_4_ (GFC_REAL_4 *val)
+{
+  return (__builtin_isnormal(*val) || *val == 0) ? 1 : 0;
+}
+
+int ieee_is_normal_8_ (GFC_REAL_8 *val)
+{
+  return (__builtin_isnormal(*val) || *val == 0) ? 1 : 0;
+}
+
+GFC_REAL_4 ieee_copy_sign_4_4_ (GFC_REAL_4 *, GFC_REAL_4 *);
+export_proto(ieee_copy_sign_4_4_);
+GFC_REAL_4 ieee_copy_sign_4_4_ (GFC_REAL_4 *x, GFC_REAL_4 *y)
+{
+  GFC_REAL_4 s = __builtin_signbit(*y) ? -1 : 1;
+  return __builtin_copysign(*x, s);
+}
+
+GFC_REAL_4 ieee_copy_sign_4_8_ (GFC_REAL_4 *, GFC_REAL_8 *);
+export_proto(ieee_copy_sign_4_8_);
+GFC_REAL_4 ieee_copy_sign_4_8_ (GFC_REAL_4 *x, GFC_REAL_8 *y)
+{
+  GFC_REAL_4 s = __builtin_signbit(*y) ? -1 : 1;
+  return __builtin_copysign(*x, s);
+}
+
+GFC_REAL_8 ieee_copy_sign_8_4_ (GFC_REAL_8 *, GFC_REAL_4 *);
+export_proto(ieee_copy_sign_8_4_);
+GFC_REAL_8 ieee_copy_sign_8_4_ (GFC_REAL_8 *x, GFC_REAL_4 *y)
+{
+  GFC_REAL_8 s = __builtin_signbit(*y) ? -1 : 1;
+  return __builtin_copysign(*x, s);
+}
+
+GFC_REAL_8 ieee_copy_sign_8_8_ (GFC_REAL_8 *, GFC_REAL_8 *);
+export_proto(ieee_copy_sign_8_8_);
+GFC_REAL_8 ieee_copy_sign_8_8_ (GFC_REAL_8 *x, GFC_REAL_8 *y)
+{
+  GFC_REAL_8 s = __builtin_signbit(*y) ? -1 : 1;
+  return __builtin_copysign(*x, s);
+}
+
+int ieee_unordered_4_4_ (GFC_REAL_4 *, GFC_REAL_4 *);
+export_proto(ieee_unordered_4_4_);
+int ieee_unordered_4_4_ (GFC_REAL_4 *x, GFC_REAL_4 *y)
+{
+  return __builtin_isunordered(*x, *y);
+}
+
+int ieee_unordered_4_8_ (GFC_REAL_4 *, GFC_REAL_8 *);
+export_proto(ieee_unordered_4_8_);
+int ieee_unordered_4_8_ (GFC_REAL_4 *x, GFC_REAL_8 *y)
+{
+  return __builtin_isunordered(*x, *y);
+}
+
+int ieee_unordered_8_4_ (GFC_REAL_8 *, GFC_REAL_4 *);
+export_proto(ieee_unordered_8_4_);
+int ieee_unordered_8_4_ (GFC_REAL_8 *x, GFC_REAL_4 *y)
+{
+  return __builtin_isunordered(*x, *y);
+}
+
+int ieee_unordered_8_8_ (GFC_REAL_8 *, GFC_REAL_8 *);
+export_proto(ieee_unordered_8_8_);
+int ieee_unordered_8_8_ (GFC_REAL_8 *x, GFC_REAL_8 *y)
+{
+  return __builtin_isunordered(*x, *y);
+}
+
+
+/* Arithmetic functions (LOGB, NEXT_AFTER, REM, RINT, SCALB).  */
+
+GFC_REAL_4 ieee_logb_4_ (GFC_REAL_4 *);
+export_proto(ieee_logb_4_);
+
+GFC_REAL_4 ieee_logb_4_ (GFC_REAL_4 *x)
+{
+  GFC_REAL_4 res;
+  char buffer[GFC_FPE_STATE_BUFFER_SIZE];
+
+  get_fpu_state (buffer);
+  res = __builtin_logb (*x);
+  set_fpu_state (buffer);
+  return res;
+}
+
+GFC_REAL_8 ieee_logb_8_ (GFC_REAL_8 *);
+export_proto(ieee_logb_8_);
+
+GFC_REAL_8 ieee_logb_8_ (GFC_REAL_8 *x)
+{
+  GFC_REAL_8 res;
+  char buffer[GFC_FPE_STATE_BUFFER_SIZE];
+
+  get_fpu_state (buffer);
+  res = __builtin_logb (*x);
+  set_fpu_state (buffer);
+  return res;
+}
+
+GFC_REAL_4 ieee_next_after_4_4_ (GFC_REAL_4 *, GFC_REAL_4 *);
+export_proto(ieee_next_after_4_4_);
+
+GFC_REAL_4 ieee_next_after_4_4_ (GFC_REAL_4 *x, GFC_REAL_4 *y)
+{
+  return __builtin_nextafterf (*x, *y);
+}
+
+GFC_REAL_4 ieee_next_after_4_8_ (GFC_REAL_4 *, GFC_REAL_8 *);
+export_proto(ieee_next_after_4_8_);
+
+GFC_REAL_4 ieee_next_after_4_8_ (GFC_REAL_4 *x, GFC_REAL_8 *y)
+{
+  return __builtin_nextafterf (*x, *y);
+}
+
+GFC_REAL_8 ieee_next_after_8_4_ (GFC_REAL_8 *, GFC_REAL_4 *);
+export_proto(ieee_next_after_8_4_);
+
+GFC_REAL_8 ieee_next_after_8_4_ (GFC_REAL_8 *x, GFC_REAL_4 *y)
+{
+  return __builtin_nextafter (*x, *y);
+}
+
+GFC_REAL_8 ieee_next_after_8_8_ (GFC_REAL_8 *, GFC_REAL_8 *);
+export_proto(ieee_next_after_8_8_);
+
+GFC_REAL_8 ieee_next_after_8_8_ (GFC_REAL_8 *x, GFC_REAL_8 *y)
+{
+  return __builtin_nextafter (*x, *y);
+}
+
+GFC_REAL_4 ieee_rem_4_4_ (GFC_REAL_4 *, GFC_REAL_4 *);
+export_proto(ieee_rem_4_4_);
+
+GFC_REAL_4 ieee_rem_4_4_ (GFC_REAL_4 *x, GFC_REAL_4 *y)
+{
+  GFC_REAL_4 res;
+  char buffer[GFC_FPE_STATE_BUFFER_SIZE];
+
+  get_fpu_state (buffer);
+  res = __builtin_remainderf (*x, *y);
+  set_fpu_state (buffer);
+  return res;
+}
+
+GFC_REAL_8 ieee_rem_4_8_ (GFC_REAL_4 *, GFC_REAL_8 *);
+export_proto(ieee_rem_4_8_);
+
+GFC_REAL_8 ieee_rem_4_8_ (GFC_REAL_4 *x, GFC_REAL_8 *y)
+{
+  GFC_REAL_8 res;
+  char buffer[GFC_FPE_STATE_BUFFER_SIZE];
+
+  get_fpu_state (buffer);
+  res = __builtin_remainder (*x, *y);
+  set_fpu_state (buffer);
+  return res;
+}
+
+GFC_REAL_8 ieee_rem_8_4_ (GFC_REAL_8 *, GFC_REAL_4 *);
+export_proto(ieee_rem_8_4_);
+
+GFC_REAL_8 ieee_rem_8_4_ (GFC_REAL_8 *x, GFC_REAL_4 *y)
+{
+  GFC_REAL_8 res;
+  char buffer[GFC_FPE_STATE_BUFFER_SIZE];
+
+  get_fpu_state (buffer);
+  res = __builtin_remainder (*x, *y);
+  set_fpu_state (buffer);
+  return res;
+}
+
+GFC_REAL_8 ieee_rem_8_8_ (GFC_REAL_8 *, GFC_REAL_8 *);
+export_proto(ieee_rem_8_8_);
+
+GFC_REAL_8 ieee_rem_8_8_ (GFC_REAL_8 *x, GFC_REAL_8 *y)
+{
+  GFC_REAL_8 res;
+  char buffer[GFC_FPE_STATE_BUFFER_SIZE];
+
+  get_fpu_state (buffer);
+  res = __builtin_remainder (*x, *y);
+  set_fpu_state (buffer);
+  return res;
+}
+
+GFC_REAL_4 ieee_rint_4_ (GFC_REAL_4 *);
+export_proto(ieee_rint_4_);
+
+GFC_REAL_4 ieee_rint_4_ (GFC_REAL_4 *x)
+{
+  GFC_REAL_4 res;
+  char buffer[GFC_FPE_STATE_BUFFER_SIZE];
+
+  get_fpu_state (buffer);
+  res = __builtin_rint (*x);
+  set_fpu_state (buffer);
+  return res;
+}
+
+GFC_REAL_8 ieee_rint_8_ (GFC_REAL_8 *);
+export_proto(ieee_rint_8_);
+
+GFC_REAL_8 ieee_rint_8_ (GFC_REAL_8 *x)
+{
+  GFC_REAL_8 res;
+  char buffer[GFC_FPE_STATE_BUFFER_SIZE];
+
+  get_fpu_state (buffer);
+  res = __builtin_rint (*x);
+  set_fpu_state (buffer);
+  return res;
+}
+
+GFC_REAL_4 ieee_scalb_4_ (GFC_REAL_4 *, int *);
+export_proto(ieee_scalb_4_);
+
+GFC_REAL_4 ieee_scalb_4_ (GFC_REAL_4 *x, int *i)
+{
+  return __builtin_scalbnf (*x, *i);
+}
+
+GFC_REAL_8 ieee_scalb_8_ (GFC_REAL_8 *, int *);
+export_proto(ieee_scalb_8_);
+
+GFC_REAL_8 ieee_scalb_8_ (GFC_REAL_8 *x, int *i)
+{
+  return __builtin_scalbn (*x, *i);
+}
+
+
+#define GFC_FPE_ALL (GFC_FPE_INVALID | GFC_FPE_DENORMAL | \
+		     GFC_FPE_ZERO | GFC_FPE_OVERFLOW | \
+		     GFC_FPE_UNDERFLOW | GFC_FPE_INEXACT)
+
+/* Functions to save and restore floating-point state, clear and restore
+   exceptions on procedure entry/exit.  The rules we follow are set
+   in Fortran 2008's 14.3 paragraph 3, note 14.4, 14.4 paragraph 4,
+   14.5 paragraph 2, and 14.6 paragraph 1.  */
+
+void ieee_procedure_entry (void *);
+export_proto(ieee_procedure_entry);
+
+void
+ieee_procedure_entry (void *state)
+{
+  /* Save the floating-point state in the space provided by the caller.  */
+  get_fpu_state (state);
+
+  /* Clear the floating-point exceptions.  */
+  set_fpu_except_flags (0, GFC_FPE_ALL);
+}
+
+
+void ieee_procedure_exit (void *);
+export_proto(ieee_procedure_exit);
+
+void
+ieee_procedure_exit (void *state)
+{
+  /* Get the flags currently signaling.  */
+  int flags = get_fpu_except_flags ();
+
+  /* Restore the floating-point state we had on entry.  */
+  set_fpu_state (state);
+
+  /* And re-raised the flags that were raised since entry.  */
+  set_fpu_except_flags (flags, 0);
+}
+

libgfortran/libgfortran.h

@@ -754,15 +754,39 @@ internal_proto(gf_strerror);
 extern void set_fpu (void);
 internal_proto(set_fpu);
 
+extern int get_fpu_trap_exceptions (void);
+internal_proto(get_fpu_trap_exceptions);
+
+extern void set_fpu_trap_exceptions (int, int);
+internal_proto(set_fpu_trap_exceptions);
+
+extern int support_fpu_trap (int);
+internal_proto(support_fpu_trap);
+
 extern int get_fpu_except_flags (void);
 internal_proto(get_fpu_except_flags);
 
-extern void set_fpu_rounding_mode (int round);
+extern void set_fpu_except_flags (int, int);
+internal_proto(set_fpu_except_flags);
+
+extern int support_fpu_flag (int);
+internal_proto(support_fpu_flag);
+
+extern void set_fpu_rounding_mode (int);
 internal_proto(set_fpu_rounding_mode);
 
 extern int get_fpu_rounding_mode (void);
 internal_proto(get_fpu_rounding_mode);
 
+extern int support_fpu_rounding_mode (int);
+internal_proto(support_fpu_rounding_mode);
+
+extern void get_fpu_state (void *);
+internal_proto(get_fpu_state);
+
+extern void set_fpu_state (void *);
+internal_proto(set_fpu_state);
+
 /* memory.c */
 
 extern void *xmalloc (size_t) __attribute__ ((malloc));