This is the mail archive of the
libc-ports@sources.redhat.com
mailing list for the libc-ports project.
Re: [PATCH] ARM: Add Cortex-A15 optimized NEON and VFP memcpy routines, with IFUNC.
- From: Will Newton <will dot newton at linaro dot org>
- To: Richard Henderson <rth at twiddle dot net>
- Cc: libc-ports at sourceware dot org, Patch Tracking <patches at linaro dot org>
- Date: Mon, 15 Apr 2013 20:47:27 +0100
- Subject: Re: [PATCH] ARM: Add Cortex-A15 optimized NEON and VFP memcpy routines, with IFUNC.
- References: <516BCEE5 dot 9070809 at linaro dot org> <516C357F dot 40406 at twiddle dot net> <CANu=Dmj5b2oFqvALjR5x_+Nwg8CRQSSazP9omFroin2SDqb_Tg at mail dot gmail dot com> <516C4554 dot 3090202 at twiddle dot net> <CANu=DmjtkP7zyT65FBQoAy=ze6mSXCKv2YherWgL_gQk8n0YtQ at mail dot gmail dot com> <516C48ED dot 7070205 at twiddle dot net> <CANu=DmiJDEq884E0_QBtG1dpYE+LORdWG=DGkK=aoK5DJUdw6g at mail dot gmail dot com> <516C4CFF dot 9090900 at twiddle dot net>
On 15 April 2013 19:54, Richard Henderson <rth@twiddle.net> wrote:
> On 2013-04-15 20:48, Will Newton wrote:
>>
>> It should be only on armv7 (as its in the armv7 sub-directory) but I
>> will make sure to use DO_RET anyway. One slight issue is that the
>> PC-relative add is not available in thumb mode, but I guess I can just
>> use arm instead.
>
>
> It's in thumb2 mode, encoding T3. We never use thumb1.
It looks like encoding T3 is unpredictable for m in {13, 15} in the
ARMv7 ARM A8.8.6. Unless I'm looking in the wrong place? I can work
around it with a mov in any case.
--
Will Newton
Toolchain Working Group, Linaro