re PR tree-optimization/52459 (PRE performs stupid inserts)

2012-03-22  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/52459
	* tree-ssa-pre.c (inhibit_phi_insertion): Do not inhibit
	PHI insertion for calls.

From-SVN: r185676

gcc/ChangeLog

+2012-03-22  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/52459
+	* tree-ssa-pre.c (inhibit_phi_insertion): Do not inhibit
+	PHI insertion for calls.
+
 2012-03-21  Steven Bosscher  <steven@gcc.gnu.org>
 
 	* cse.c (invalidate_from_sets_and_clobbers, try_back_substitute_reg,

gcc/tree-ssa-pre.c

@@ -3242,6 +3242,10 @@ inhibit_phi_insertion (basic_block bb, pre_expr expr)
     {
       switch (op->opcode)
 	{
+	case CALL_EXPR:
+	  /* Calls are not a problem.  */
+	  return false;
+
 	case ARRAY_REF:
 	case ARRAY_RANGE_REF:
 	  if (TREE_CODE (op->op0) != SSA_NAME)