Re: [PATCH] Move ~X | X -> -1 folding

[Marek Polacek]

On Tue, Jun 30, 2015 at 12:22:57PM +0200, Bernhard Reutner-Fischer wrote:
> >+unsigned int
> >+fn3 (unsigned int x)
> >+{
> >+  return ~x | x;
> >+}
> >+
> >+unsigned int
> >+fn4 (unsigned int x)
> >+{
> >+  return ~x | x;
> >+}
> 
> What's the difference between fn3 and fn4?

Oops, fixed.

2015-06-30  Marek Polacek  <pola...@redhat.com>

        * gcc.dg/fold-ior-2.c (fn4): Swap operands.

diff --git gcc/testsuite/gcc.dg/fold-ior-2.c gcc/testsuite/gcc.dg/fold-ior-2.c
index 6abac9e..41b372d 100644
--- gcc/testsuite/gcc.dg/fold-ior-2.c
+++ gcc/testsuite/gcc.dg/fold-ior-2.c
@@ -22,7 +22,7 @@ fn3 (unsigned int x)
 unsigned int
 fn4 (unsigned int x)
 {
-  return ~x | x;
+  return x | ~x;
 }
 
 int

        Marek