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Re: rex.W prefix in jumps on x86_64
From: |
Paulo César Pereira de Andrade |
Subject: |
Re: rex.W prefix in jumps on x86_64 |
Date: |
Mon, 14 Sep 2020 10:27:10 -0300 |
Em qui., 3 de set. de 2020 às 05:58, Marc Nieper-Wißkirchen
<marc.nieper+gnu@gmail.com> escreveu:
>
> Am Fr., 21. Aug. 2020 um 19:24 Uhr schrieb Paulo César Pereira de
> Andrade <paulo.cesar.pereira.de.andrade@gmail.com>:
>
> > 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?
Sorry, I thought I had already pushed the commit. Patch applied.
> Thanks,
>
> Marc
Thanks!
Paulo