gcc/testsuite/gcc.dg/modmod.c

   1 /* { dg-options "-O -fdump-tree-optimized-raw" } */
   2
   3 int f(int a, int b){
   4   a %= b;
   5   return a % b;
   6 }
   7 int g(unsigned a, unsigned b){
   8   a %= b;
   9   return a < b;
  10 }
  11
  12 /* { dg-final { scan-tree-dump-times "trunc_mod_expr" 1 "optimized" } } */