re PR target/67770 (i386: -fshrink-wrap can interact badly with trampolines)

	PR target/67770
	* config/i386/i386.md (simple_return): Disable if
	ix86_static_chain_on_stack is true.

	* gcc.target/i386/pr67770.c: New test.

From-SVN: r230593

gcc/ChangeLog

+2015-11-19  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/67770
+	* config/i386/i386.md (simple_return): Disable if
+	ix86_static_chain_on_stack is true.
+
 2015-11-19  Richard Sandiford  <richard.sandiford@arm.com>
 
 	PR bootstrap/68393

gcc/config/i386/i386.md

@@ -12203,10 +12203,14 @@
 ;; We need to disable this for TARGET_SEH, as otherwise
 ;; shrink-wrapped prologue gets enabled too.  This might exceed
 ;; the maximum size of prologue in unwind information.
+;; Also disallow shrink-wrapping if using stack slot to pass the
+;; static chain pointer - the first instruction has to be pushl %esi
+;; and it can't be moved around, as we use alternate entry points
+;; in that case.
 
 (define_expand "simple_return"
   [(simple_return)]
-  "!TARGET_SEH"
+  "!TARGET_SEH && !ix86_static_chain_on_stack"
 {
   if (crtl->args.pops_args)
     {

gcc/testsuite/ChangeLog

+2015-11-19  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/67770
+	* gcc.target/i386/pr67770.c: New test.
+
 2015-11-18  Jeff Law  <law@redhat.com>
 
         PR tree-optimization/68198

gcc/testsuite/gcc.target/i386/pr67770.c

+/* PR target/67770 */
+/* { dg-do run { target ia32 } } */
+/* { dg-require-effective-target trampolines } */
+/* { dg-options "-O2" } */
+
+#ifndef NO_TRAMPOLINES
+__attribute__ ((noinline)) void
+foo (int i, void (* __attribute__ ((regparm (3))) bar) (int))
+{
+  bar (i);
+}
+#endif
+
+int
+main ()
+{
+#ifndef NO_TRAMPOLINES
+  int p = 0;
+
+  __attribute__ ((regparm (3), noinline)) void
+  bar (int i)
+  {
+    if (__builtin_expect (i, 0))
+      ++p;
+  }
+
+  foo (0, bar);
+  bar (0);
+
+  if (p != 0)
+    __builtin_abort ();
+
+  foo (1, bar);
+  bar (1);
+
+  if (p != 2)
+    __builtin_abort ();
+#endif
+  return 0;
+}