| /* { dg-do compile { target c++11 } } */ |
| /* { dg-options "-O2" } */ |
| |
| #include <atomic> |
| |
| bool |
| tbit0 (std::atomic<unsigned int> &i) |
| { |
| #define BIT (1 << 0) |
| return i.fetch_and(~BIT, std::memory_order_relaxed) & BIT; |
| #undef BIT |
| } |
| |
| bool |
| tbit30 (std::atomic<unsigned int> &i) |
| { |
| #define BIT (1 << 30) |
| return i.fetch_and(~BIT, std::memory_order_relaxed) & BIT; |
| #undef BIT |
| } |
| |
| bool |
| tbit31 (std::atomic<unsigned int> &i) |
| { |
| #define BIT (1 << 31) |
| return i.fetch_and(~BIT, std::memory_order_relaxed) & BIT; |
| #undef BIT |
| } |
| |
| /* { dg-final { scan-assembler-times "lock;?\[ \t\]*btrl" 3 } } */ |
| /* { dg-final { scan-assembler-not "cmpxchg" } } */ |
