validation/optim/lsr-and1.c

   1 // If (t >> S) is simplified into (x >> S)
   2 // then the whole expression will be 0.
   3 // The test is only interesting if the sub-expression
   4 // (x & M) is referenced more than once
   5 // (because otherwise other simplifications apply).
   6 unsigned lsr_and1(unsigned x)
   7 {
   8         unsigned t = (x & 0xfffff000);
   9         return ((t >> 12) ^ (x >> 12)) & t;
  10 }
  11
  12 /*
  13  * check-name: lsr-and1
  14  * check-command: test-linearize -Wno-decl $file
  15  *
  16  * check-output-ignore
  17  * check-output-contains: ret\\..*\\$0$
  18  */