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Re: [PATCH, v3] ARM: Integrate Cortex-A15 optimized memcpy using NEON/VFP.

From: Richard Earnshaw <rearnsha at arm dot com>
To: "Schwarz, Konrad" <konrad dot schwarz at siemens dot com>
Cc: Will Newton <will dot newton at linaro dot org>, Ramana Radhakrishnan <Ramana dot Radhakrishnan at arm dot com>, "newlib at sourceware dot org" <newlib at sourceware dot org>
Date: Fri, 12 Apr 2013 17:07:03 +0100
Subject: Re: [PATCH, v3] ARM: Integrate Cortex-A15 optimized memcpy using NEON/VFP.
References: <515C5C47 dot 4090601 at linaro dot org> <5166F1AD dot 7010703 at arm dot com> <CANu=Dmhs_YKDj+6aJPO3tp_4Qk0NwhtYWUWibgy1tC3wWkd04g at mail dot gmail dot com> <8A6D8E6D161CD644B982513286072E8D02FB11 at DEFTHW99EJ1MSX dot ww902 dot siemens dot net> <5167D697 dot 5080906 at arm dot com> <8A6D8E6D161CD644B982513286072E8D02FCDC at DEFTHW99EJ1MSX dot ww902 dot siemens dot net> <5167FAE7 dot 40804 at arm dot com> <8A6D8E6D161CD644B982513286072E8D02FEFA at DEFTHW99EJ1MSX dot ww902 dot siemens dot net>

On 12/04/13 16:13, Schwarz, Konrad wrote:

-----Original Message-----
From: newlib-owner@sourceware.org [mailto:newlib-owner@sourceware.org]
On Behalf Of Richard Earnshaw
Sent: Friday, April 12, 2013 2:16 PM
Subject: Re: [PATCH, v3] ARM: Integrate Cortex-A15 optimized memcpy
using NEON/VFP.

Everything you're talking about here is for full OS-based systems with
context switching.  Since Newlib is primarily (outside of Cygwin) a
library for bare metal systems, surely we should provide developers
with ability to chose.  Given that the code provides three variants for
different configurations, I don't really see what you are arguing
about, unless it is that we shouldn't give users a choice.


I'm worried that the floating-point version will be used as
the default.

I really don't see that as an issue for newlib. I think it's reasonableto assume here that if the user has enabled FP/Neon, then they're happyto use it whenever there's a benefit to be obtained by doing so.Context switch issues are irrelevant on bare metal.

R.

References:
- [PATCH, v3] ARM: Integrate Cortex-A15 optimized memcpy using NEON/VFP.
  - From: Will Newton
- Re: [PATCH, v3] ARM: Integrate Cortex-A15 optimized memcpy using NEON/VFP.
  - From: Ramana Radhakrishnan
- Re: [PATCH, v3] ARM: Integrate Cortex-A15 optimized memcpy using NEON/VFP.
  - From: Will Newton
- RE: [PATCH, v3] ARM: Integrate Cortex-A15 optimized memcpy using NEON/VFP.
  - From: Schwarz, Konrad
- Re: [PATCH, v3] ARM: Integrate Cortex-A15 optimized memcpy using NEON/VFP.
  - From: Richard Earnshaw
- RE: [PATCH, v3] ARM: Integrate Cortex-A15 optimized memcpy using NEON/VFP.
  - From: Schwarz, Konrad
- Re: [PATCH, v3] ARM: Integrate Cortex-A15 optimized memcpy using NEON/VFP.
  - From: Richard Earnshaw
- RE: [PATCH, v3] ARM: Integrate Cortex-A15 optimized memcpy using NEON/VFP.
  - From: Schwarz, Konrad

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