gcc/testsuite/gcc.dg/20150120-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-original" } */
   3
   4 /* x + (x & 1) -> (x + 1) & ~1 */
   5 int
   6 fn1 (int x)
   7 {
   8         return x + (x & 1);
   9 }
  10 int
  11 fn2 (int x)
  12 {
  13         return (x & 1) + x;
  14 }
  15 int
  16 fn3 (int x)
  17 {
  18         return x + (1 & x);
  19 }
  20 int
  21 fn4 (int x)
  22 {
  23         return (1 & x) + x;
  24 }
  25 unsigned int
  26 fn5 (unsigned int x)
  27 {
  28         return x + (x & 1);
  29 }
  30 unsigned int
  31 fn6 (unsigned int x)
  32 {
  33         return (x & 1) + x;
  34 }
  35 unsigned int
  36 fn7 (unsigned int x)
  37 {
  38         return x + (x % 2);
  39 }
  40 unsigned int
  41 fn8 (unsigned int x)
  42 {
  43         return (x % 2) + x;
  44 }
  45 unsigned int
  46 fn9 (unsigned int x)
  47 {
  48         return (1LL & x) + x;
  49 }
  50
  51 /* { dg-final { scan-tree-dump-times "x \\+ 1" 9 "original" } } */