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Message-ID: <CAK1hOcNRpkN_cK_sfW396+c41iops4weO_jVu2JEb7rs2h2JyQ@mail.gmail.com>
Date: Mon, 16 Feb 2015 11:09:25 +0100
From: Denys Vlasenko <vda.linux@...glemail.com>
To: Rich Felker <dalias@...c.org>
Cc: musl <musl@...ts.openwall.com>
Subject: Re: [PATCH] x86_64/memset: use "small block" code for blocks
up to 30 bytes long
On Sun, Feb 15, 2015 at 11:55 PM, Rich Felker <dalias@...c.org> wrote:
>> "sub $8,%rcx" can be folded into lea.
>
> No, it can't, for the above reason.
Why can't?
lea -9(%rdx), %rcx
will also underflow for %rdx == 0, just like "lea -1".
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