[AArch64] Tighten direct call pattern to repair -fno-plt

2015-08-06  Jiong Wang  <jiong.wang@arm.com>

gcc/
  * config/aarch64/aarch64-protos.h (aarch64_is_noplt_call_p): New declaration.
  * config/aarch64/aarch64.c (aarch64_is_noplt_call_p): New function.
  * config/aarch64/aarch64.md (call_value_symbol): Check noplt scenarios.
  (call_symbol): Likewise.

gcc/testsuite/
  * gcc.target/aarch64/noplt_1.c: New testcase.
  * gcc.target/aarch64/noplt_2.c: Likewise.

From-SVN: r226681

gcc/ChangeLog

@@ -1,3 +1,10 @@
+2015-08-06  Jiong Wang  <jiong.wang@arm.com>
+
+	* config/aarch64/aarch64-protos.h (aarch64_is_noplt_call_p): New declaration.
+	* config/aarch64/aarch64.c (aarch64_is_noplt_call_p): New function.
+	* config/aarch64/aarch64.md (call_value_symbol): Check noplt scenarios.
+	(call_symbol): Likewise.
+
 2015-08-06  Venkataramanan Kumar  <Venkataramanan.kumar@amd.com>
 
 	* tree-vect-patterns.c (vect_recog_mult_pattern): New function

gcc/config/aarch64/aarch64-protos.h

@@ -258,6 +258,7 @@ bool aarch64_handle_option (struct gcc_options *, struct gcc_options *,
 			     const struct cl_decoded_option *, location_t);
 bool aarch64_is_extend_from_extract (machine_mode, rtx, rtx);
 bool aarch64_is_long_call_p (rtx);
+bool aarch64_is_noplt_call_p (rtx);
 bool aarch64_label_mentioned_p (rtx);
 void aarch64_declare_function_name (FILE *, const char*, tree);
 bool aarch64_legitimate_pic_operand_p (rtx);

gcc/config/aarch64/aarch64.c

@@ -744,6 +744,24 @@ aarch64_is_long_call_p (rtx sym)
   return aarch64_decl_is_long_call_p (SYMBOL_REF_DECL (sym));
 }
 
+/* Return true if calls to symbol-ref SYM should not go through
+   plt stubs.  */
+
+bool
+aarch64_is_noplt_call_p (rtx sym)
+{
+  const_tree decl = SYMBOL_REF_DECL (sym);
+
+  if (flag_pic
+      && decl
+      && (!flag_plt
+	  || lookup_attribute ("noplt", DECL_ATTRIBUTES (decl)))
+      && !targetm.binds_local_p (decl))
+    return true;
+
+  return false;
+}
+
 /* Return true if the offsets to a zero/sign-extract operation
    represent an expression that matches an extend operation.  The
    operands represent the paramters from

gcc/config/aarch64/aarch64.md

@@ -603,7 +603,8 @@
    (use (match_operand 2 "" ""))
    (clobber (reg:DI LR_REGNUM))]
   "GET_CODE (operands[0]) == SYMBOL_REF
-   && !aarch64_is_long_call_p (operands[0])"
+   && !aarch64_is_long_call_p (operands[0])
+   && !aarch64_is_noplt_call_p (operands[0])"
   "bl\\t%a0"
   [(set_attr "type" "call")]
 )
@@ -665,7 +666,8 @@
    (use (match_operand 3 "" ""))
    (clobber (reg:DI LR_REGNUM))]
   "GET_CODE (operands[1]) == SYMBOL_REF
-   && !aarch64_is_long_call_p (operands[1])"
+   && !aarch64_is_long_call_p (operands[1])
+   && !aarch64_is_noplt_call_p (operands[1])"
   "bl\\t%a1"
   [(set_attr "type" "call")]
 )

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2015-08-06  Jiong Wang  <jiong.wang@arm.com>
+
+	* gcc.target/aarch64/noplt_1.c: New testcase.
+	* gcc.target/aarch64/noplt_2.c: Likewise.
+
 2015-08-06  Venkataramanan Kumar  <Venkataramanan.kumar@amd.com>
 
 	* gcc.dg/vect/vect-mult-pattern-1.c: New test.

gcc/testsuite/gcc.target/aarch64/noplt_1.c

@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fpic -fno-plt" } */
+/* { dg-skip-if "-mcmodel=large, no support for -fpic" { aarch64-*-* }  { "-mcmodel=large" } { "" } } */
+
+int* bar (void) ;
+
+int
+foo (int a)
+{
+  int *b = bar ();
+  return b[a];
+}
+
+/* { dg-final { scan-assembler "#:got:" { target { aarch64_tiny || aarch64_small } } } } */
+/* { dg-final { scan-assembler "#:got_lo12:" { target aarch64_small } } } */

gcc/testsuite/gcc.target/aarch64/noplt_2.c

@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fpic" } */
+/* { dg-skip-if "-mcmodel=large, no support for -fpic" { aarch64-*-* }  { "-mcmodel=large" } { "" } } */
+
+__attribute__ ((noplt))
+int* bar0 (void) ;
+int* bar1 (void) ;
+
+int
+foo (int a)
+{
+  int *b0 = bar0 ();
+  int *b1 = bar1 ();
+  return b0[a] + b1[a];
+}
+
+/* { dg-final { scan-assembler-times "#:got:" 1 { target { aarch64_tiny || aarch64_small } } } } */
+/* { dg-final { scan-assembler-times "#:got_lo12:" 1 { target aarch64_small } } } */