gcc/testsuite/gcc.dg/i386-volatile-1.c

   1 /* PR optimization/11381 */
   2 /* Originator: <tobias@ringstrom.mine.nu> */
   3 /* { dg-do compile { target i?86-*-* } } */
   4 /* { dg-options "-O" } */
   5
   6 /* Verify that the comparison is not optimized away. */
   7
   8 void foo(volatile unsigned int *vaddr)
   9 {
  10   while (*vaddr != *vaddr)
  11     ;
  12 }
  13
  14 /* { dg-final { scan-assembler "cmp" } } */