re PR tree-optimization/59014 (wrong code at -Os and above on x86_64-linux-gnu)

PR tree-optimization/59014
	* tree-vrp.c (register_edge_assert_for_1): Don't look
	through conversions from non-integral types or through
	narrowing conversions.

	* gcc.c-torture/execute/pr59014.c: New test.

From-SVN: r205417

gcc/ChangeLog

@@ -1,5 +1,10 @@
 2013-11-26  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/59014
+	* tree-vrp.c (register_edge_assert_for_1): Don't look
+	through conversions from non-integral types or through
+	narrowing conversions.
+
 	PR target/59229
 	* config/i386/i386.c (device_alg): Fix up formatting.
 	(ix86_expand_set_or_movmem): Handle max_size < epilogue_size_needed

gcc/testsuite/ChangeLog

@@ -1,5 +1,8 @@
 2013-11-26  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/59014
+	* gcc.c-torture/execute/pr59014.c: New test.
+
 	PR target/59229
 	* gcc.c-torture/execute/pr59229.c: New test.
 

gcc/testsuite/gcc.c-torture/execute/pr59014.c

@@ -0,0 +1,25 @@
+/* PR tree-optimization/59014 */
+
+int a = 2, b, c, d;
+
+int
+foo ()
+{
+  for (;; c++)
+    if ((b > 0) | (a & 1))
+      ;
+    else
+      {
+	d = a;
+	return 0;
+      }
+}
+
+int
+main ()
+{
+  foo ();
+  if (d != 2)
+    __builtin_abort ();
+  return 0;
+}

gcc/tree-vrp.c

@@ -5438,9 +5438,13 @@ register_edge_assert_for_1 (tree op, enum tree_code code,
     }
   else if (CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (op_def)))
     {
-      /* Recurse through the type conversion.  */
+      /* Recurse through the type conversion, unless it is a narrowing
-      retval |= register_edge_assert_for_1 (gimple_assign_rhs1 (op_def),
+	 conversion or conversion from non-integral type.  */
-					    code, e, bsi);
+      tree rhs = gimple_assign_rhs1 (op_def);
+      if (INTEGRAL_TYPE_P (TREE_TYPE (rhs))
+	  && (TYPE_PRECISION (TREE_TYPE (rhs))
+	      <= TYPE_PRECISION (TREE_TYPE (op))))
+	retval |= register_edge_assert_for_1 (rhs, code, e, bsi);
     }
 
   return retval;