gcc/testsuite/gcc.dg/tree-ssa/cast-3.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-optimized" } */
   3
   4 /* PR tree-optimization/117776 */
   5
   6 /* These 2 functions should be optimized to just `return 1;`
   7    as `(int)(unsigned smaller)medium` is the same as
   8    `(int)medium&smaller_mask` where smaller_mask in this case is
   9    either `1` (_Bool) or `0xff` (char).   */
  10 int f(unsigned char a)
  11 {
  12   _Bool odd = (a & 1) != 0;
  13   int odd1 = (a & 1) != 0;
  14   return odd == odd1;
  15 }
  16 int g(unsigned short a)
  17 {
  18   unsigned char b = a;
  19   int d = b;
  20   unsigned short c = a&0xff;
  21   int e = c;
  22   return d == e;
  23 }
  24
  25 /* { dg-final { scan-tree-dump-times "return 1" 2 "optimized" } } */