From: Bernd Schmidt <bschmidt@redhat.com>
To: Florian Weimer <fweimer@redhat.com>,
GCC Patches <gcc-patches@gcc.gnu.org>,
Nick Clifton <nickc@redhat.com>
Subject: Re: Thoughts on memcmp expansion (PR43052)
Date: Tue, 31 May 2016 15:05:00 -0000 [thread overview]
Message-ID: <574D9B25.7040302@redhat.com> (raw)
In-Reply-To: <55238d87-b52b-b743-5a5f-5afb43355b26@redhat.com>
On 05/30/2016 11:37 AM, Florian Weimer wrote:
>> * Expand __memcmp_eq for small constant sizes with loads and
>> comparison, fall back to a memcmp call.
>
> Should we export such a function from glibc? I expect it's fairly
> common. Computing the tail difference costs a few cycles.
At the moment the patch ensures that no actual memcmp_eq function is
called, it's either expanded inline or we fall back to memcmp. But
there's no reason why it couldn't be added under some appropriate name.
Bernd
prev parent reply other threads:[~2016-05-31 14:09 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-15 16:58 Bernd Schmidt
2016-01-18 9:22 ` Richard Biener
2016-04-28 18:36 ` Bernd Schmidt
2016-05-02 12:52 ` Richard Biener
2016-05-02 12:57 ` Bernd Schmidt
2016-05-02 13:14 ` Richard Biener
2016-05-12 17:14 ` Bernd Schmidt
2016-05-13 10:20 ` Richard Biener
2016-05-13 13:05 ` Bernd Schmidt
2016-05-13 13:07 ` Richard Biener
2016-05-13 13:13 ` Bernd Schmidt
2016-05-13 13:53 ` Joseph Myers
2016-05-13 14:00 ` Bernd Schmidt
2016-05-13 20:41 ` Joseph Myers
2016-05-31 23:50 ` Bernd Schmidt
2016-01-18 12:22 ` Nick Clifton
2016-01-19 21:36 ` Jeff Law
2016-05-30 11:29 ` Florian Weimer
2016-05-31 15:05 ` Bernd Schmidt [this message]
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