this post was submitted on 01 Dec 2025
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Why xor eax, eax? (xania.org)
submitted 2 weeks ago by rssbot@lemmy.bestiver.se to c/hackernews@lemmy.bestiver.se
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[โ€“] henfredemars@infosec.pub 1 points 2 weeks ago

Fun fact:

nop is also just xchg eax, eax!

[โ€“] gheesh@lemmy.world 1 points 2 weeks ago

The instruction is smaller than "mov eax, 0" (because it includes the 32-bit zero) and the result is the same. Notice that smaller may mean more instructions in cache for a tight loop, so it may also result in better performace, too.