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use cmpxchgq for 64-bit operands in atomicCompareAndSwap

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Joel Dice 2009-11-20 15:17:35 -07:00
parent 2276eece0e
commit a0d763d871
1 changed files with 1 additions and 1 deletions
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src/x86.h
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@ -212,7 +212,7 @@ atomicCompareAndSwap(uintptr_t* p, uintptr_t old, uintptr_t new_)
#elif defined ARCH_x86_64 #elif defined ARCH_x86_64
uint8_t result; uint8_t result;
__asm__ __volatile__("lock; cmpxchg1 %2, %0; setz %1" __asm__ __volatile__("lock; cmpxchgq %2, %0; setz %1"
: "=m"(*p), "=q"(result) : "=m"(*p), "=q"(result)
: "r"(new_), "a"(old), "m"(*p) : "r"(new_), "a"(old), "m"(*p)
: "memory"); : "memory");