gcc/testsuite/gcc.dg/fold-modpow2.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-fdump-tree-original" } */
   3
   4 unsigned int
   5 my_mod (unsigned int a, unsigned int b)
   6 {
   7   return a % (1 << b);
   8 }
   9
  10 /* The above should be simplified to (unsigned int) ((1 << b) + -1) & a */
  11 /* { dg-final { scan-tree-dump "& a;" "original" } } */