re PR rtl-optimization/57003 (gcc breaks -O2 optimization with Wine(64) -…

re PR rtl-optimization/57003 (gcc breaks -O2 optimization with Wine(64) - links/info/bisect of commits included)

	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.

From-SVN: r198320

gcc/ChangeLog

+2013-04-25  Jakub Jelinek  <jakub@redhat.com>
+
+	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.
+
 2013-04-25  James Greenhalgh  <james.greenhalgh@arm.com>
 
 	* config/aarch64/aarch64-simd.md

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.  */

gcc/testsuite/ChangeLog

+2013-04-25  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/57003
+	* gcc.target/i386/pr57003.c: New test.
+
 2013-04-25  Marek Polacek  <polacek@redhat.com>
 
 	PR tree-optimization/57066

gcc/testsuite/gcc.target/i386/pr57003.c

+/* 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;
+}