re PR tree-optimization/22329 (VRP produces mis-matched (non compatible) types in MODIFY_EXPR)

2005-07-08  Andrew Pinski  <pinskia@physics.uc.edu>

        PR tree-opt/22329
        * gcc.dg/pr22329.c: New test.
2005-07-08  Andrew Pinski  <pinskia@physics.uc.edu>

        PR tree-opt/22329
        * tree-ssa-propagate.c (fold_predicate_in): Convert the value
        to the correct type if we have a MODIFY_EXPR.

From-SVN: r101789

gcc/ChangeLog

+2005-07-08  Andrew Pinski  <pinskia@physics.uc.edu>
+
+	PR tree-opt/22329
+	* tree-ssa-propagate.c (fold_predicate_in): Convert the value
+	to the correct type if we have a MODIFY_EXPR.
+
 2005-07-08  Kazu Hirata  <kazu@codesourcery.com>
 
 	PR tree-optimization/22360

gcc/testsuite/ChangeLog

+2005-07-08  Andrew Pinski  <pinskia@physics.uc.edu>
+
+	PR tree-opt/22329
+	* gcc.dg/pr22329.c: New test.
+
 2005-07-08  Kazu Hirata  <kazu@codesourcery.com>
 
 	PR tree-optimization/20139

gcc/testsuite/gcc.dg/pr22329.c

+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+int f(int i)
+{
+  int k = 0;
+  if (i == 0)
+    k = i == 0;
+  return k;
+}

gcc/tree-ssa-propagate.c

@@ -1018,11 +1018,15 @@ static bool
 fold_predicate_in (tree stmt)
 {
   tree *pred_p = NULL;
+  bool modify_expr_p = false;
   tree val;
 
   if (TREE_CODE (stmt) == MODIFY_EXPR
       && COMPARISON_CLASS_P (TREE_OPERAND (stmt, 1)))
-    pred_p = &TREE_OPERAND (stmt, 1);
+    {
+      modify_expr_p = true;
+      pred_p = &TREE_OPERAND (stmt, 1);
+    }
   else if (TREE_CODE (stmt) == COND_EXPR)
     pred_p = &COND_EXPR_COND (stmt);
   else
@@ -1031,6 +1035,9 @@ fold_predicate_in (tree stmt)
   val = vrp_evaluate_conditional (*pred_p, true);
   if (val)
     {
+      if (modify_expr_p)
+        val = fold_convert (TREE_TYPE (*pred_p), val);
+      
       if (dump_file)
 	{
 	  fprintf (dump_file, "Folding predicate ");