[4.8/4.9 Regression] gcc-4.8.0 breaks -O2 optimization with Wine(64)

http://gcc.gnu.org/PR57003
https://bugs.gentoo.org/465894

commit d25bf7e2b1274478ce7a612317b2ca6c5653e577
Author: jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Thu Apr 25 21:50:26 2013 +0000

    	PR rtl-optimization/57003
    	* regcprop.c (copyprop_hardreg_forward_1): If ksvd.ignore_set_reg,
    	call note_stores with kill_clobbered_value callback again after
    	killing regs_invalidated_by_call.
    
    	* gcc.target/i386/pr57003.c: New test.
    
    
    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_8-branch@198321 138bc75d-0d04-0410-961f-82ee72b054a4
---
 gcc/ChangeLog                           |  7 +++++
 gcc/regcprop.c                          |  7 +++++
 gcc/testsuite/ChangeLog                 |  5 +++
 gcc/testsuite/gcc.target/i386/pr57003.c | 54 +++++++++++++++++++++++++++++++++
 4 files changed, 73 insertions(+)

--- a/gcc/regcprop.c
+++ b/gcc/regcprop.c
@@ -1015,6 +1015,13 @@ copyprop_hardreg_forward_1 (basic_block bb, struct value_data *vd)
 	  EXECUTE_IF_SET_IN_HARD_REG_SET (regs_invalidated_by_call, 0, regno, hrsi)
 	    if (regno < set_regno || regno >= set_regno + set_nregs)
 	      kill_value_regno (regno, 1, vd);
+
+	  /* If SET was seen in CALL_INSN_FUNCTION_USAGE, and SET_SRC
+	     of the SET isn't in regs_invalidated_by_call hard reg set,
+	     but instead among CLOBBERs on the CALL_INSN, we could wrongly
+	     assume the value in it is still live.  */
+	  if (ksvd.ignore_set_reg)
+	    note_stores (PATTERN (insn), kill_clobbered_value, vd);
 	}
 
       /* Notice stores.  */
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr57003.c
@@ -0,0 +1,54 @@
+/* PR rtl-optimization/57003 */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+#define N 2001
+unsigned short *b, *c, *d;
+
+__attribute__ ((noinline, noclone)) unsigned
+bar (void)
+{
+  asm volatile ("" : : : "memory");
+  return N;
+}
+
+__attribute__ ((noinline, noclone)) unsigned short *
+baz (unsigned long x)
+{
+  if (x != N * sizeof (unsigned short) + 20)
+    __builtin_abort ();
+  asm volatile ("" : : : "memory");
+  return d;
+}
+
+__attribute__ ((ms_abi, noinline, noclone))
+foo (void)
+{
+  unsigned d;
+  unsigned short *e;
+  if ((d = bar ()))
+    {
+      e = baz (d * sizeof (unsigned short) + 20);
+      __builtin_memcpy (e, b, d * sizeof (unsigned short));
+      c = e;
+    }
+}
+
+int
+main ()
+{
+  unsigned short a[2 * N];
+  int i;
+  for (i = 0; i < 2 * N; i++)
+    a[i] = i + 1;
+  b = a;
+  d = a + N;
+  asm volatile ("" : : : "memory");
+  foo ();
+  for (i = 0; i < N; i++)
+    if (a[i] != i + 1 || a[i + N] != i + 1)
+      __builtin_abort ();
+  if (c != a + N)
+    __builtin_abort ();
+  return 0;
+}