From: Richard Henderson <rth@twiddle.net>
To: "Joseph S. Myers" <joseph@codesourcery.com>
Cc: Roland McGrath <roland@hack.frob.com>, libc-ports@sourceware.org
Subject: Re: [PATCH roland/arm-memchr] ARM: Make armv6t2 memchr implementation usable without Thumb.
Date: Tue, 12 Mar 2013 06:09:00 -0000 [thread overview]
Message-ID: <513EC685.1020803@twiddle.net> (raw)
In-Reply-To: <Pine.LNX.4.64.1303120026480.21125@digraph.polyomino.org.uk>
On 2013-03-11 17:30, Joseph S. Myers wrote:
> On Mon, 11 Mar 2013, Roland McGrath wrote:
>
>> This changes the memchr implementation to be usable without Thumb.
>
> I'm not clear on how the register allocation changes relate to making this
> implementation usable without Thumb.
>
This re ldrd. ARM mode requires r2 = r + 1, and r even.
Thumb2 allows arbitrary r2.
r~
next prev parent reply other threads:[~2013-03-12 6:09 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-11 23:31 Roland McGrath
2013-03-12 0:30 ` Joseph S. Myers
2013-03-12 6:09 ` Richard Henderson [this message]
2013-03-12 15:58 ` Joseph S. Myers
2013-03-12 17:07 ` [PATCH 1/2 roland/arm-memchr] ARM: Change register allocation in armv6t2 memchr implementation Roland McGrath
2013-03-12 23:20 ` Joseph S. Myers
2013-03-13 0:06 ` Roland McGrath
2013-03-12 17:08 ` [PATCH 2/2 roland/arm-memchr] ARM: Make armv6t2 memchr implementation usable without Thumb Roland McGrath
2013-03-12 23:21 ` Joseph S. Myers
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