| /* { dg-do compile } */ |
| /* { dg-options "-O2 -marm" } */ |
| /* { dg-require-effective-target arm_arch_v7a_ok } */ |
| /* { dg-add-options arm_arch_v7a } */ |
| |
| /* Make sure that RTL optimizers don't do any unexpected transformations |
| on the compare_exchange loop. */ |
| |
| #include <stdatomic.h> |
| |
| atomic_uint foo; |
| atomic_uint bar; |
| int glob; |
| |
| int |
| main (void) |
| { |
| glob = atomic_compare_exchange_strong (&foo, &bar, 0); |
| return glob; |
| } |
| |
| /* { dg-final { scan-assembler-times "dmb\tish" 2 } } */ |
| /* { dg-final { scan-assembler-times "ldrex\t" 1 } } */ |
| /* { dg-final { scan-assembler-times "strex\t" 1 } } */ |
