re PR target/68701 ("gcc -m32 -finstrument-functions -ffixed-ebp" produces internal compiler error)

	PR target/68701
	* config/i386/i386.c (ix86_option_override_internal): Enable
	-maccumulate-outgoing-args when %ebp is fixed due to stack
	realignment requirements.

testsuite/ChangeLog:

	PR target/68701
	* testsuite/gcc.target/i386/pr68701-1.c: New test.
	* testsuite/gcc.target/i386/pr68701-2.c: Ditto.

From-SVN: r231419

gcc/ChangeLog

+2015-12-08  Uros Bizjak  <ubizjak@gmail.com>
+
+	PR target/68701
+	* config/i386/i386.c (ix86_option_override_internal): Enable
+	-maccumulate-outgoing-args when %ebp is fixed due to stack
+	realignment requirements.
+
 2015-12-08  Tom de Vries  <tom@codesourcery.com>
 
 	PR tree-optimization/68640

gcc/config/i386/i386.c

@@ -5296,6 +5296,17 @@ ix86_option_override_internal (bool main_args_p,
       opts->x_target_flags |= MASK_ACCUMULATE_OUTGOING_ARGS;
     }
 
+  /* Stack realignment without -maccumulate-outgoing-args requires %ebp,
+     so enable -maccumulate-outgoing-args when %ebp is fixed.  */
+  if (fixed_regs[BP_REG]
+      && !(opts->x_target_flags & MASK_ACCUMULATE_OUTGOING_ARGS))
+    {
+      if (opts_set->x_target_flags & MASK_ACCUMULATE_OUTGOING_ARGS)
+	warning (0, "fixed ebp register requires %saccumulate-outgoing-args%s",
+		 prefix, suffix);
+      opts->x_target_flags |= MASK_ACCUMULATE_OUTGOING_ARGS;
+    }
+
   /* Figure out what ASM_GENERATE_INTERNAL_LABEL builds as a prefix.  */
   {
     char *p;

gcc/testsuite/ChangeLog

 2015-12-08  Uros Bizjak  <ubizjak@gmail.com>
 
+	PR target/68701
+	* testsuite/gcc.target/i386/pr68701-1.c: New test.
+	* testsuite/gcc.target/i386/pr68701-2.c: Ditto.
+
+2015-12-08  Uros Bizjak  <ubizjak@gmail.com>
+
 	* gcc.target/i386/sse4_1-round.h (do_round): Fix inline asm statements.
 	* gcc.target/i386/sse4_1-roundsd-4.c (do_round): Ditto.
 	* gcc.target/i386/sse4_1-roundss-4.c (do_round): Ditto.

gcc/testsuite/gcc.target/i386/pr68701-1.c

+/* { dg-do compile } */
+/* { dg-options "-O -ffixed-ebp -mno-accumulate-outgoing-args" } */
+
+/* { dg-warning "fixed ebp register requires" "" { target *-*-* } 0 } */
+
+void foo (void);
+
+int
+main (int argc, char *argv[])
+{
+  foo ();
+  return argc - 1;
+}

gcc/testsuite/gcc.target/i386/pr68701-2.c

+/* { dg-do compile } */
+/* { dg-options "-O -ffixed-ebp -mno-accumulate-outgoing-args -mstackrealign -msse" } */
+
+/* { dg-warning "fixed ebp register requires" "" { target *-*-* } 0 } */
+
+typedef float V __attribute__((vector_size(16)));
+
+void bar (V a)
+{
+  volatile V b = a;
+}