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| author | David Majnemer <david.majnemer@gmail.com> | 2015-06-05 18:24:55 +0000 |
|---|---|---|
| committer | David Majnemer <david.majnemer@gmail.com> | 2015-06-05 18:24:55 +0000 |
| commit | 81ecbf45d4d7046d5b1c897bbcd9525da9128d07 (patch) | |
| tree | e6070493f5671bd8ed991eb0292d152bef2c4b8b /clang/lib/Headers | |
| parent | 3dabb233845f4385e649377d85a21b667a8ed8de (diff) | |
| download | bcm5719-llvm-81ecbf45d4d7046d5b1c897bbcd9525da9128d07.tar.gz bcm5719-llvm-81ecbf45d4d7046d5b1c897bbcd9525da9128d07.zip | |
Revert accidental commit
This change was unrelated to r239170.
llvm-svn: 239176
Diffstat (limited to 'clang/lib/Headers')
| -rw-r--r-- | clang/lib/Headers/Intrin.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/clang/lib/Headers/Intrin.h b/clang/lib/Headers/Intrin.h index 9592cccb15c..727a55e5b76 100644 --- a/clang/lib/Headers/Intrin.h +++ b/clang/lib/Headers/Intrin.h @@ -546,8 +546,13 @@ _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) { - long __OldVal = __atomic_fetch_or(__BitBase, 1 << __BitPos, 5); - return (__OldVal >> __BitPos) & 1; + unsigned char __Res; + __asm__ ("xor %0, %0\n" + "lock bts %2, %1\n" + "setc %0\n" + : "=r" (__Res), "+m"(*__BitBase) + : "Ir"(__BitPos)); + return __Res; } #endif #ifdef __x86_64__ |
