On 04/10/2016 04:00 AM, darat wrote:
Is there a particular reason explaining why mov reg,0 is used and not xor reg,reg ? (or even and reg, 0)for example here: https://github.com/D-Programming-Language/druntime/blob/master/src/core/atomic.d#L1009 It seems that in Go too mov is used: https://github.com/golang/go/blob/0104a31b8fbcbe52728a08867b26415d282c35d2/src/runtime/internal/atomic/asm_amd64p32.s#L15
I don't know the answer but Google finds interesting discussions about that: https://www.google.com/search?q=mov+0+versus+xor+cycles&ie=utf-8&oe=utf-8#q=mov+0+versus+xor+cpu+cycle Ali
