diff options
| author | Dimitry Andric <dim@FreeBSD.org> | 2022-02-05 18:04:23 +0000 |
|---|---|---|
| committer | Dimitry Andric <dim@FreeBSD.org> | 2022-02-05 18:05:05 +0000 |
| commit | ecbca9f5fb7d7613d2b94982c4825eb0d33d6842 (patch) | |
| tree | 3a4038f3b7bafaeade9fd6146ea8021237616657 /compiler-rt/lib/sanitizer_common | |
| parent | 6f8fc217eaa12bf657be1c6468ed9938d10168b3 (diff) | |
Diffstat (limited to 'compiler-rt/lib/sanitizer_common')
| -rw-r--r-- | compiler-rt/lib/sanitizer_common/sanitizer_atomic_clang.h | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_atomic_clang.h b/compiler-rt/lib/sanitizer_common/sanitizer_atomic_clang.h index fc13ca52dda7..c2b22cf572a6 100644 --- a/compiler-rt/lib/sanitizer_common/sanitizer_atomic_clang.h +++ b/compiler-rt/lib/sanitizer_common/sanitizer_atomic_clang.h @@ -74,13 +74,12 @@ template <typename T> inline bool atomic_compare_exchange_strong(volatile T *a, typename T::Type *cmp, typename T::Type xchg, memory_order mo) { - typedef typename T::Type Type; - Type cmpv = *cmp; - Type prev; - prev = __sync_val_compare_and_swap(&a->val_dont_use, cmpv, xchg); - if (prev == cmpv) return true; - *cmp = prev; - return false; + // Transitioned from __sync_val_compare_and_swap to support targets like + // SPARC V8 that cannot inline atomic cmpxchg. __atomic_compare_exchange + // can then be resolved from libatomic. __ATOMIC_SEQ_CST is used to best + // match the __sync builtin memory order. + return __atomic_compare_exchange(&a->val_dont_use, cmp, &xchg, false, + __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); } template<typename T> |