gcc/testsuite/gcc.dg/tree-ssa/neg-cast-2.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O1 -fdump-tree-fre1 -fdump-tree-optimized" } */
   3 /* part of PR tree-optimization/108397 */
   4
   5 long long
   6 foo (unsigned char o)
   7 {
   8   unsigned long long t1 = -(long long) (o == 0);
   9   unsigned long long t2 = -(long long) (t1 != 0);
  10   unsigned long long t3 = -(long long) (t1 <= t2);
  11   return t3;
  12 }
  13
  14 /* Should be able to optimize this down to just `return -1;` during fre1. */
  15 /* { dg-final { scan-tree-dump "return -1;" "fre1" } } */
  16 /* FRE does not remove all dead statements so a few negate expressions are left behind. */
  17 /* { dg-final { scan-tree-dump-not " -\[^1\]" "fre1" { xfail *-*-* } } } */
  18
  19 /* { dg-final { scan-tree-dump "return -1;" "optimized" } } */
  20 /* { dg-final { scan-tree-dump-not " - " "optimized" } } */