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[Sanitizer] First effort to implement atomic_compare_exchange for 1-byte vars on Windows 

llvm-svn: 177854
This commit is contained in:
Alexey Samsonov 2013-03-25 09:23:30 +00:00
parent b7fb5e6f4b
commit a208c397bf
1 changed files with 24 additions and 3 deletions
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27
compiler-rt/lib/sanitizer_common/sanitizer_atomic_msvc.h
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@ -134,6 +134,27 @@ INLINE u16 atomic_exchange(volatile atomic_uint16_t *a,
return v;
}
INLINE bool atomic_compare_exchange_strong(volatile atomic_uint8_t *a,
u8 *cmp,
u8 xchg,
memory_order mo) {
(void)mo;
DCHECK(!((uptr)a % sizeof(*a)));
u8 cmpv = *cmp;
u8 prev;
__asm {
mov al, cmpv
mov ecx, a
mov dl, xchg
lock cmpxchg [ecx], dl
mov prev, al
}
if (prev == cmpv)
return true;
*cmp = prev;
return false;
}
INLINE bool atomic_compare_exchange_strong(volatile atomic_uintptr_t *a,
uptr *cmp,
uptr xchg,
@ -149,9 +170,9 @@ INLINE bool atomic_compare_exchange_strong(volatile atomic_uintptr_t *a,
template<typename T>
INLINE bool atomic_compare_exchange_weak(volatile T *a,
typename T::Type *cmp,
typename T::Type xchg,
memory_order mo) {
typename T::Type *cmp,
typename T::Type xchg,
memory_order mo) {
return atomic_compare_exchange_strong(a, cmp, xchg, mo);
}