-fuse-caller-save - Enable for i386

2014-05-30  Tom de Vries  <tom@codesourcery.com>

	* config/i386/i386.c (TARGET_CALL_FUSAGE_CONTAINS_NON_CALLEE_CLOBBERS):
	Redefine as true.

	* gcc.target/i386/fuse-caller-save.c: New test.
	* gcc.dg/ira-shrinkwrap-prep-1.c: Run with -fno-use-caller-save.
	* gcc.dg/ira-shrinkwrap-prep-2.c: Same.

From-SVN: r211078

gcc/ChangeLog

 2014-05-30  Tom de Vries  <tom@codesourcery.com>
 
+	* config/i386/i386.c (TARGET_CALL_FUSAGE_CONTAINS_NON_CALLEE_CLOBBERS):
+	Redefine as true.
+
+2014-05-30  Tom de Vries  <tom@codesourcery.com>
+
 	* lra-int.h (struct lra_reg): Add field actual_call_used_reg_set.
 	* lra.c (initialize_lra_reg_info_element): Add init of
 	actual_call_used_reg_set field.

gcc/config/i386/i386.c

@@ -47272,6 +47272,9 @@ ix86_atomic_assign_expand_fenv (tree *hold, tree *clear, tree *update)
 #undef TARGET_MODE_PRIORITY
 #define TARGET_MODE_PRIORITY ix86_mode_priority
 
+#undef TARGET_CALL_FUSAGE_CONTAINS_NON_CALLEE_CLOBBERS
+#define TARGET_CALL_FUSAGE_CONTAINS_NON_CALLEE_CLOBBERS true
+
 struct gcc_target targetm = TARGET_INITIALIZER;
 
 #include "gt-i386.h"

gcc/testsuite/ChangeLog

+2014-05-30  Tom de Vries  <tom@codesourcery.com>
+
+	* gcc.target/i386/fuse-caller-save.c: New test.
+	* gcc.dg/ira-shrinkwrap-prep-1.c: Run with -fno-use-caller-save.
+	* gcc.dg/ira-shrinkwrap-prep-2.c: Same.
+
 2014-04-30  Alan Lawrence  <alan.lawrence@arm.com>
 
 	gcc.target/arm/simd/vrev16p8_1.c: New file.

gcc/testsuite/gcc.dg/ira-shrinkwrap-prep-1.c

 /* { dg-do compile { target { { x86_64-*-* && lp64 } || { powerpc*-*-* && lp64 } } } } */
-/* { dg-options "-O3 -fdump-rtl-ira -fdump-rtl-pro_and_epilogue"  } */
+/* { dg-options "-O3 -fdump-rtl-ira -fdump-rtl-pro_and_epilogue -fno-use-caller-save"  } */
 
 long __attribute__((noinline, noclone))
 foo (long a)

gcc/testsuite/gcc.dg/ira-shrinkwrap-prep-2.c

 /* { dg-do compile { target { { x86_64-*-* && lp64 } || { powerpc*-*-* && lp64 } } } } */
-/* { dg-options "-O3 -fdump-rtl-ira -fdump-rtl-pro_and_epilogue"  } */
+/* { dg-options "-O3 -fdump-rtl-ira -fdump-rtl-pro_and_epilogue -fno-use-caller-save"  } */
 
 long __attribute__((noinline, noclone))
 foo (long a)

gcc/testsuite/gcc.target/i386/fuse-caller-save.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -fuse-caller-save" } */
+/* Testing -fuse-caller-save optimization option.  */
+
+static int __attribute__((noinline))
+bar (int x)
+{
+  return x + 3;
+}
+
+int __attribute__((noinline))
+foo (int y)
+{
+  return y + bar (y);
+}
+
+int
+main (void)
+{
+  return !(foo (5) == 13);
+}
+
+/* { dg-final { scan-assembler-not "\.cfi_def_cfa_offset"  } } */
+/* { dg-final { scan-assembler-not "\.cfi_offset"  } } */
+