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[PATCH] ARM: NEON detected memcpy.

From: "Shih-Yuan Lee (FourDollars)" <sylee at canonical dot com>
To: patches at eglibc dot org, libc-ports at sourceware dot org
Cc: 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 15:58:20 +0800
Subject: [PATCH] ARM: NEON detected memcpy.

Hi,

I am working on the NEON detected memcpy.
This is based on what Siarhei Siamashka did at 2009 [1].

The idea is to use HWCAP and check NEON bit.
If there is a NEON bit, using NEON optimized memcpy.
If not, using the original memcpy instead.

If using NEON optimized memcpy, the performance of memcpy will be
raised up by about 50% [2].

How do you think about this idea? Any comment is welcome.

[1]: http://sourceware.org/ml/libc-ports/2009-07/msg00003.html
[2]: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka13544.html

Regards,
$4

Attachment: 0001-ARM-NEON-optimized-implementation-of-memcpy.patch
Description: Binary data

Attachment: 0002-ARM-NEON-detected-memcpy.patch
Description: Binary data

Follow-Ups:
- Re: [PATCH] ARM: NEON detected memcpy.
  - From: Will Newton
- Re: [PATCH] ARM: NEON detected memcpy.
  - From: Joseph S. Myers

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