From 0394622853ff7c35417625979782f19fa3682122 Mon Sep 17 00:00:00 2001
From: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 18 May 2011 13:33:53 +0000
Subject: [PATCH] 2011-05-18  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/49018
	* gimple.c (gimple_has_side_effects): Volatile asms have side-effects.
	* tree-ssa-ifcombine.c (bb_no_side_effects_p): Use
	gimple_has_side_effects.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_6-branch@173862 138bc75d-0d04-0410-961f-82ee72b054a4

index 9a94f06..233a4f5 100644
--- a/gcc/gimple.c
+++ b/gcc/gimple.c
@@ -2286,6 +2286,10 @@ gimple_has_side_effects (const_gimple s)
   if (gimple_has_volatile_ops (s))
     return true;
 
+  if (gimple_code (s) == GIMPLE_ASM
+      && gimple_asm_volatile_p (s))
+    return true;
+
   if (is_gimple_call (s))
     {
       unsigned nargs = gimple_call_num_args (s);
@@ -2299,7 +2303,7 @@ gimple_has_side_effects (const_gimple s)
       if (gimple_call_lhs (s)
           && TREE_SIDE_EFFECTS (gimple_call_lhs (s)))
 	{
-	  gcc_assert (gimple_has_volatile_ops (s));
+	  gcc_checking_assert (gimple_has_volatile_ops (s));
 	  return true;
 	}
 
@@ -2309,7 +2313,7 @@ gimple_has_side_effects (const_gimple s)
       for (i = 0; i < nargs; i++)
         if (TREE_SIDE_EFFECTS (gimple_call_arg (s, i)))
 	  {
-	    gcc_assert (gimple_has_volatile_ops (s));
+	    gcc_checking_assert (gimple_has_volatile_ops (s));
 	    return true;
 	  }
 
@@ -2318,11 +2322,14 @@ gimple_has_side_effects (const_gimple s)
   else
     {
       for (i = 0; i < gimple_num_ops (s); i++)
-	if (TREE_SIDE_EFFECTS (gimple_op (s, i)))
-	  {
-	    gcc_assert (gimple_has_volatile_ops (s));
-	    return true;
-	  }
+	{
+	  tree op = gimple_op (s, i);
+	  if (op && TREE_SIDE_EFFECTS (op))
+	    {
+	      gcc_checking_assert (gimple_has_volatile_ops (s));
+	      return true;
+	    }
+	}
     }
 
   return false;
diff --git a/gcc/tree-ssa-ifcombine.c b/gcc/tree-ssa-ifcombine.c
index bc551b2..e23bb76 100644
--- a/gcc/tree-ssa-ifcombine.c
+++ b/gcc/tree-ssa-ifcombine.c
@@ -107,7 +107,7 @@ bb_no_side_effects_p (basic_block bb)
     {
       gimple stmt = gsi_stmt (gsi);
 
-      if (gimple_has_volatile_ops (stmt)
+      if (gimple_has_side_effects (stmt)
 	  || gimple_vuse (stmt))
 	return false;
     }
-- 
1.7.0.4