re PR tree-optimization/49018 (Inline assembly block executed outside…

re PR tree-optimization/49018 (Inline assembly block executed outside conditional check with "-O1 -ftree-vrp")

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.

From-SVN: r173861

gcc/ChangeLog

 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.
+
+2011-05-18  Richard Guenther  <rguenther@suse.de>
+
 	* gimple.c (gimple_register_type_1): New function, split out from ...
 	(gimple_register_type): ... here.  Avoid infinite recursion.
 

gcc/gimple.c

@@ -2354,6 +2354,10 @@ 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);
@@ -2368,7 +2372,7 @@ 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;
 	}
 
@@ -2379,7 +2383,7 @@ 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;
 	  }
 
@@ -2388,11 +2392,14 @@ 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;

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;
     }