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Message-ID: <20130301072617.GP6181@port70.net>
Date: Fri, 1 Mar 2013 08:26:17 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: Re: [PATCH] Added ARM optimised memcpy implementation
* nwmcsween@...il.com <nwmcsween@...il.com> [2013-02-28 19:14:28 -0800]:
> Hmm what does this do that builtins cannot? What I'm asking is why is this more preformant than preload + word-at-a-time.
>
musl uses naive memcpy if src and dst are not congruent (src%4 != dst%4)
the android asm takes care of that by fetching a 32bytes
from src into registers and dumping it into dst with
apropriate shifts
and in the congruent case 32byte alignment is used (cacheline aligned)
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