gcc/testsuite/gcc.target/arm/pr69904.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -marm" } */
   3 /* { dg-require-effective-target arm_arch_v7a_ok } */
   4 /* { dg-add-options arm_arch_v7a } */
   5
   6 /* Make sure that RTL optimizers don't do any unexpected transformations
   7    on the compare_exchange loop.  */
   8
   9 #include <stdatomic.h>
  10
  11 atomic_uint foo;
  12 atomic_uint bar;
  13 int glob;
  14
  15 int
  16 main (void)
  17 {
  18   glob = atomic_compare_exchange_strong (&foo, &bar, 0);
  19   return glob;
  20 }
  21
  22 /* { dg-final { scan-assembler-times "dmb\tish" 2 } } */
  23 /* { dg-final { scan-assembler-times "ldrex\t" 1 } } */
  24 /* { dg-final { scan-assembler-times "strex\t" 1 } } */