gcc/testsuite/gcc.dg/pr25530.c

/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-optimized" } */
/* { dg-require-effective-target int32 } */

int
f (unsigned t)
{
  return (t / 2) * 2;
}

/* { dg-final { scan-tree-dump "\& -2" "optimized" } } */