gcc/testsuite/gcc.dg/tree-ssa/pr24990-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O1 -fdump-tree-optimized" } */
   3
   4 int f(int x)
   5 {
   6   return ((~x) != 0);
   7 }
   8 int f1(int x)
   9 {
  10   return ((~x) == 0);
  11 }
  12
  13 /* There should be no != 0 which is produced by the front-end as
  14    ~x != 0 is the same as x != -1 (or ~0).   Likewise for ==. */
  15 /* { dg-final { scan-tree-dump-times "!= 0" 0 "optimized"} } */
  16 /* { dg-final { scan-tree-dump-times "!= -1" 1 "optimized"} } */
  17 /* { dg-final { scan-tree-dump-times "== 0" 0 "optimized"} } */
  18 /* { dg-final { scan-tree-dump-times "== -1" 1 "optimized"} } */
  19
  20 /* { dg-final { cleanup-tree-dump "optimized" } } */
  21