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SYSENTERisn't even available on x86_64 though, right? Could you explain more about this. Sorry, I come back months later as I learn more =)SYSENTERis available on 64-bit x86 as well as 32-bit x86 (since the Pentium II), but it doesn’t need ECX/RCX so it doesn’t have any impact on this discussion (I’ve updated my answer).SYSCALLis 64-bit-specific and overwrites RCX.