match.pd (~x | x): Don't use tree_nop_conversion_p.

	* match.pd (~x | x): Don't use tree_nop_conversion_p.  Build
	the final expression with the operand's type and then convert
	it to the type of the expression.

	* gcc.dg/fold-ior-3.c: New test.

From-SVN: r225196

gcc/ChangeLog

@@ -3,6 +3,10 @@
 	* match.pd (X - (X / Y) * Y): Use convert1 and convert2.  Convert
 	both operands of the resulting expression.	
 
+	* match.pd (~x | x): Don't use tree_nop_conversion_p.  Build
+	the final expression with the operand's type and then convert
+	it to the type of the expression.
+
 2015-06-30  Richard Biener  <rguenther@suse.de>
 
 	* fold-const.c (fold_binary_loc): Move ~x & ~y -> ~(x | y) and

gcc/match.pd

@@ -286,8 +286,7 @@ along with GCC; see the file COPYING3.  If not see
 /* ~x | x -> -1 */
 (simplify
  (bit_ior:c (convert? @0) (convert? (bit_not @0)))
- (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
-  { build_all_ones_cst (type); }))
+ (convert { build_all_ones_cst (TREE_TYPE (@0)); }))
 
 /* x ^ x -> 0 */
 (simplify

gcc/testsuite/ChangeLog

@@ -2,6 +2,8 @@
 
 	* gcc.dg/fold-minus-6.c: New test.
 
+	* gcc.dg/fold-ior-3.c: New test.
+
 2015-06-30  Edward Smith-Rowland  <3dw4rd@verizon.net>
 
 	Implement N4197 - Adding u8 character literals

gcc/testsuite/gcc.dg/fold-ior-3.c

+/* { dg-do compile } */
+/* { dg-options "-O -fdump-tree-cddce1" } */
+
+int
+fn1 (_Bool a)
+{
+  return ((int) a) | ((int) ~a);
+}
+
+int
+fn2 (unsigned char a)
+{
+  return ((int) a) | ((int) ~a);
+}
+
+int
+fn3 (unsigned short a)
+{
+  return ((int) a) | ((int) ~a);
+}
+
+int
+fn4 (signed char a)
+{
+  return ((int) a) | ((int) ~a);
+}
+
+int
+fn5 (signed short a)
+{
+  return ((int) a) | ((int) ~a);
+}
+
+/* { dg-final { scan-tree-dump-not "~" "cddce1" } } */
+/* { dg-final { scan-tree-dump-not " \\| " "cddce1" } } */