File gcc48-bnc884738.patch of Package gcc48.2996

2014-07-15  Michael Matz  <matz@suse.de>

	PR rtl-optimization/61772
	* ifcvt.c (dead_or_predicable): Check jump to be free of side
	effects.

	* gcc.dg/torture/pr61772.c: New test.

Index: gcc/testsuite/gcc.dg/torture/pr61772.c
===================================================================
--- gcc/testsuite/gcc.dg/torture/pr61772.c	(revision 0)
+++ gcc/testsuite/gcc.dg/torture/pr61772.c	(revision 212563)
@@ -0,0 +1,24 @@
+/* { dg-do compile } */
+/* { dg-final { scan-assembler-times "XXX" 2 } } */
+
+static inline __attribute__((always_inline)) int dec_and_test (int *i)
+{
+    asm volatile goto ("XXX %0, %l[cc_label]"
+		       : : "m" (*i) : "memory" : cc_label);
+    return 0;
+cc_label:
+    return 1;
+}
+extern int getit (int *);
+int f (int *i, int cond)
+{
+  if (cond) {
+      getit (0);
+      if (dec_and_test (i))
+	getit (i);
+      return 42;
+  }
+  if (dec_and_test (i))
+    (void)1;
+  return getit (i);
+}
Index: gcc/ifcvt.c
===================================================================
--- gcc/ifcvt.c	(revision 212562)
+++ gcc/ifcvt.c	(revision 212563)
@@ -4138,6 +4138,8 @@ dead_or_predicable (basic_block test_bb,
 
   if (JUMP_P (end))
     {
+      if (!onlyjump_p (end))
+	return FALSE;
       if (head == end)
 	{
 	  head = end = NULL_RTX;