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Re: rex.W prefix in jumps on x86_64

From: Marc Nieper-Wißkirchen
Subject: Re: rex.W prefix in jumps on x86_64
Date: Thu, 3 Sep 2020 10:58:35 +0200

Am Fr., 21. Aug. 2020 um 19:24 Uhr schrieb Paulo César Pereira de
Andrade <>:

>   The WIDE argument forces a rex prefix. The patch is correct.
> If the register argument is r8 or larger, the prefix will be added,
> and disassembler will not show it is not required.
>   I believe there are a few extra cases where a rex prefix is
> forced, just that the disassembler does not show it. It is a single
> byte, but the more bytes saved the better.

And the disassembly doesn't look weird and make people wonder. :)

Will you apply the patch to the master branch?



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