diff options
Diffstat (limited to 'clang/lib/Headers/Intrin.h')
| -rw-r--r-- | clang/lib/Headers/Intrin.h | 9 |
1 files changed, 2 insertions, 7 deletions
diff --git a/clang/lib/Headers/Intrin.h b/clang/lib/Headers/Intrin.h index 727a55e5b76..9592cccb15c 100644 --- a/clang/lib/Headers/Intrin.h +++ b/clang/lib/Headers/Intrin.h @@ -546,13 +546,8 @@ _bittestandset(long *a, long b) { #if defined(__i386__) || defined(__x86_64__) static __inline__ unsigned char __attribute__((__always_inline__, __nodebug__)) _interlockedbittestandset(long volatile *__BitBase, long __BitPos) { - unsigned char __Res; - __asm__ ("xor %0, %0\n" - "lock bts %2, %1\n" - "setc %0\n" - : "=r" (__Res), "+m"(*__BitBase) - : "Ir"(__BitPos)); - return __Res; + long __OldVal = __atomic_fetch_or(__BitBase, 1 << __BitPos, 5); + return (__OldVal >> __BitPos) & 1; } #endif #ifdef __x86_64__ |
