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by seritools
1114 days ago
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To explain the flinching (since I didn't catch it immediately): > In 64-bit mode, still use `xor r32, r32`, because writing a 32-bit reg zeros the upper 32. `xor r64, r64` is a waste of a byte, because it needs a REX prefix. (from https://stackoverflow.com/a/33668295/554577 ) |
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