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Re: [PATCH] ARM: NEON detected memcpy.
- From: "Joseph S. Myers" <joseph at codesourcery dot com>
- To: "Shih-Yuan Lee (FourDollars)" <sylee at canonical dot com>
- Cc: <patches at eglibc dot org>, <libc-ports at sourceware dot org>, <rex dot tsai at canonical dot com>, <jesse dot sung at canonical dot com>, <yc dot cheng at canonical dot com>, Shih-Yuan Lee <fourdollars at gmail dot com>
- Date: Wed, 3 Apr 2013 15:08:22 +0000
- Subject: Re: [PATCH] ARM: NEON detected memcpy.
- References: <CAAT15mNnqeb6tuVdV6b4uJf-qFDH1acxevyW6f-gH+SkguENmg at mail dot gmail dot com>
On Wed, 3 Apr 2013, Shih-Yuan Lee (FourDollars) wrote:
> I am working on the NEON detected memcpy.
> This is based on what Siarhei Siamashka did at 2009 [1].
I still don't see any copyright assignment on file (whether individual
with an employer disclaimer, or corporate) that would cover that work.
Without one, we can't use it, and I advise anyone working on NEON memcpy
not to look at it.
I was previously told by people at ARM that NEON memcpy wasn't a good idea
in practice because of raised power consumption, context switch costs etc.
from using NEON in processes that otherwise didn't use it, even if it
appeared superficially beneficial in benchmarks.
--
Joseph S. Myers
joseph@codesourcery.com