From: Denys Vlasenko <vda.linux@googlemail.com>
To: musl <musl@lists.openwall.com>
Subject: Re: [PATCH 1/2] x86_64/memset: simple optimizations
Date: Tue, 10 Feb 2015 22:08:29 +0100 [thread overview]
Message-ID: <CAK1hOcNPLxqvnDAsX3hYHkKm5hwLDLDjx10yysEqR8EZMdCFcA@mail.gmail.com> (raw)
In-Reply-To: <20150210205047.GK23507@brightrain.aerifal.cx>
On Tue, Feb 10, 2015 at 9:50 PM, Rich Felker <dalias@libc.org> wrote:
> On Tue, Feb 10, 2015 at 06:30:56PM +0100, Denys Vlasenko wrote:
>> "and $0xff,%esi" is a six-byte insn (81 e6 ff 00 00 00), can use
>> 4-byte "movzbl %sil,%esi" (40 0f b6 f6) instead.
>> [...]
>
> Do you want to go ahead with these patches as-is, or consider some of
> the other ideas we discussed off-list like avoiding the 64-bit imul
> entirely in the small-n case? If you think that's easy as another
> incremental change I'll go ahead with these
I think you can apply these patches without waiting
for potential future improvements.
next prev parent reply other threads:[~2015-02-10 21:08 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-10 17:30 Denys Vlasenko
2015-02-10 17:30 ` [PATCH 2/2] x86_64/memset: avoid prforming final store twice Denys Vlasenko
2015-02-10 20:50 ` [PATCH 1/2] x86_64/memset: simple optimizations Rich Felker
2015-02-10 21:08 ` Denys Vlasenko [this message]
2015-02-10 21:37 ` Rich Felker
2015-02-10 22:36 ` Rich Felker
2015-02-10 23:20 ` Rich Felker
2015-02-11 1:07 ` Denys Vlasenko
2015-02-11 1:21 ` Rich Felker
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