gcc: xtensa: allow XCHAL_* macros to be non-constant

XCHAL_* macros from the xtensa-config.h are used in a number of places
that require them to be preprocessor constants. Rewrite these places so
that non-constant XCHAL_* definitions could be used there.

2017-06-14  Max Filippov  <jcmvbkbc@gmail.com>
gcc/
	* config/xtensa/xtensa.c (xtensa_option_override): Append
	MASK_CONST16 to target_flags in the absence of TARGET_L32R.
	(hwloop_optimize, hwloop_fail, hwloop_pattern_reg,
	 xtensa_doloop_hooks): Define unconditionally.
	(xtensa_reorg_loops): Only call reorg_loops in the presence of
	TARGET_LOOPS.
	* config/xtensa/xtensa.h (TARGET_L32R): New definition.
	(TARGET_DEFAULT): Remove XCHAL_HAVE_L32R condition and account
	for it in xtensa_option_override.
	(HARD_FRAME_POINTER_IS_FRAME_POINTER,
	 HARD_FRAME_POINTER_IS_ARG_POINTER): New definitions.

From-SVN: r249202

gcc/ChangeLog

@@ -1,3 +1,17 @@
+2017-06-14  Max Filippov  <jcmvbkbc@gmail.com>
+
+	* config/xtensa/xtensa.c (xtensa_option_override): Append
+	MASK_CONST16 to target_flags in the absence of TARGET_L32R.
+	(hwloop_optimize, hwloop_fail, hwloop_pattern_reg,
+	 xtensa_doloop_hooks): Define unconditionally.
+	(xtensa_reorg_loops): Only call reorg_loops in the presence of
+	TARGET_LOOPS.
+	* config/xtensa/xtensa.h (TARGET_L32R): New definition.
+	(TARGET_DEFAULT): Remove XCHAL_HAVE_L32R condition and account
+	for it in xtensa_option_override.
+	(HARD_FRAME_POINTER_IS_FRAME_POINTER,
+	 HARD_FRAME_POINTER_IS_ARG_POINTER): New definitions.
+
 2017-06-14  Boris Kolpackov  <boris@codesynthesis.com>
 
 	* doc/cppopts.texi: Document '-' special value to -MF.

gcc/config/xtensa/xtensa.c

@@ -2182,6 +2182,13 @@ xtensa_option_override (void)
   int regno;
   machine_mode mode;
 
+  /* Use CONST16 in the absence of L32R.
+     Set it in the TARGET_OPTION_OVERRIDE to avoid dependency on xtensa
+     configuration in the xtensa-common.c  */
+
+  if (!TARGET_L32R)
+    target_flags |= MASK_CONST16;
+
   if (!TARGET_BOOLEANS && TARGET_HARD_FLOAT)
     error ("boolean registers required for the floating-point option");
 
@@ -4078,8 +4085,6 @@ xtensa_invalid_within_doloop (const rtx_insn *insn)
 
 /* Optimize LOOP.  */
 
-#if TARGET_LOOPS
-
 static bool
 hwloop_optimize (hwloop_info loop)
 {
@@ -4266,14 +4271,9 @@ static struct hw_doloop_hooks xtensa_doloop_hooks =
 static void
 xtensa_reorg_loops (void)
 {
+  if (TARGET_LOOPS)
     reorg_loops (false, &xtensa_doloop_hooks);
 }
-#else
-static inline void
-xtensa_reorg_loops (void)
-{
-}
-#endif
 
 /* Implement the TARGET_MACHINE_DEPENDENT_REORG pass.  */
 

gcc/config/xtensa/xtensa.h

@@ -66,10 +66,9 @@ along with GCC; see the file COPYING3.  If not see
 #define TARGET_LOOPS	        XCHAL_HAVE_LOOPS
 #define TARGET_WINDOWED_ABI	(XSHAL_ABI == XTHAL_ABI_WINDOWED)
 #define TARGET_DEBUG		XCHAL_HAVE_DEBUG
+#define TARGET_L32R		XCHAL_HAVE_L32R
 
-#define TARGET_DEFAULT \
+#define TARGET_DEFAULT (MASK_SERIALIZE_VOLATILE)
-  ((XCHAL_HAVE_L32R	? 0 : MASK_CONST16) |				\
-   MASK_SERIALIZE_VOLATILE)
 
 #ifndef HAVE_AS_TLS
 #define HAVE_AS_TLS 0
@@ -362,6 +361,12 @@ extern char xtensa_hard_regno_mode_ok[][FIRST_PSEUDO_REGISTER];
 /* Base register for access to arguments of the function.  */
 #define ARG_POINTER_REGNUM (GP_REG_FIRST + 17)
 
+/* Hard frame pointer is neither frame nor arg pointer.
+   The definitions are here because actual hard frame pointer register
+   definition is not a preprocessor constant.  */
+#define HARD_FRAME_POINTER_IS_FRAME_POINTER 0
+#define HARD_FRAME_POINTER_IS_ARG_POINTER 0
+
 /* For now we don't try to use the full set of boolean registers.  Without
    software pipelining of FP operations, there's not much to gain and it's
    a real pain to get them reloaded.  */