re PR rtl-optimization/55845 (454.calculix miscompares with -march=btver2 -O3…

re PR rtl-optimization/55845 (454.calculix miscompares with -march=btver2 -O3 -ffastmath -fschedule-insns -mvzeroupper for test data run)

	PR rtl-optimization/55845
	* df-problems.c (can_move_insns_across): Stop scanning at
	volatile_insn_p source instruction or give up if
	across_from .. across_to range contains any volatile_insn_p
	instructions.

	* gcc.target/i386/pr55845.c: New test.

From-SVN: r195028

gcc/ChangeLog

+2012-01-08  Jakub Jelinek  <jakub@redhat.com>
+	    Uros Bizjak  <ubizjak@gmail.com>
+
+	PR rtl-optimization/55845
+	* df-problems.c (can_move_insns_across): Stop scanning at
+	volatile_insn_p source instruction or give up if
+	across_from .. across_to range contains any volatile_insn_p
+	instructions.
+
 2013-01-08  Tejas Belagod  <tejas.belagod@arm.com>
 
 	* config/aarch64/aarch64-simd.md (vec_init<mode>): New. 

gcc/df-problems.c

 /* Standard problems for dataflow support routines.
    Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
-   2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
+   2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
    Originally contributed by Michael P. Hayes
              (m.hayes@elec.canterbury.ac.nz, mhayes@redhat.com)
    Major rewrite contributed by Danny Berlin (dberlin@dberlin.org)
@@ -3858,6 +3858,8 @@ can_move_insns_across (rtx from, rtx to, rtx across_from, rtx across_to,
 	}
       if (NONDEBUG_INSN_P (insn))
 	{
+	  if (volatile_insn_p (PATTERN (insn)))
+	    return false;
 	  memrefs_in_across |= for_each_rtx (&PATTERN (insn), find_memory,
 					     NULL);
 	  note_stores (PATTERN (insn), find_memory_stores,
@@ -3917,7 +3919,9 @@ can_move_insns_across (rtx from, rtx to, rtx across_from, rtx across_to,
       if (NONDEBUG_INSN_P (insn))
 	{
 	  if (may_trap_or_fault_p (PATTERN (insn))
-	      && (trapping_insns_in_across || other_branch_live != NULL))
+	      && (trapping_insns_in_across
+		  || other_branch_live != NULL
+		  || volatile_insn_p (PATTERN (insn))))
 	    break;
 
 	  /* We cannot move memory stores past each other, or move memory

gcc/testsuite/ChangeLog

+2012-01-08  Uros Bizjak  <ubizjak@gmail.com>
+	    Vladimir Yakovlev  <vladimir.b.yakovlev@intel.com>
+
+	PR rtl-optimization/55845
+	* gcc.target/i386/pr55845.c: New test.
+
 2013-01-08  Tejas Belagod  <tejas.belagod@arm.com>
 
 	* gcc.target/aarch64/vect-mull-compile.c: Explicitly scan for 

gcc/testsuite/gcc.target/i386/pr55845.c

+/* { dg-do run } */
+/* { dg-require-effective-target avx } */
+/* { dg-options "-O3 -ffast-math -fschedule-insns -mavx -mvzeroupper" } */
+
+#include "avx-check.h"
+
+#define N 100
+
+double
+__attribute__((noinline))
+foo (int size, double *y, double *x)
+{
+  double sum = 0.0;
+  int i;
+  for (i = 0, sum = 0.; i < size; i++)
+    sum += y[i] * x[i];
+  return sum;
+}
+
+static void
+__attribute__ ((noinline))
+avx_test ()
+{
+  double x[N];
+  double y[N];
+  double s;
+  int i;
+
+  for (i = 0; i < N; i++)
+    {
+      x[i] = i;
+      y[i] = i;
+    }
+
+  s = foo (N, y, x);
+
+  if (s != 328350.0)
+    abort ();
+}