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Re: [PATCH 2/2] aarch64,falkor: Use vector registers for copy

From: Szabolcs Nagy <szabolcs dot nagy at arm dot com>
To: Siddhesh Poyarekar <siddhesh at sourceware dot org>, libc-alpha at sourceware dot org
Cc: nd at arm dot com
Date: Fri, 29 Jun 2018 17:28:44 +0100
Subject: Re: [PATCH 2/2] aarch64,falkor: Use vector registers for copy
References: <20180629104331.13263-1-siddhesh@sourceware.org> <20180629104331.13263-2-siddhesh@sourceware.org>

On 29/06/18 11:43, Siddhesh Poyarekar wrote:

Vector registers perform better than scalar register pairs for copying
data so prefer them instead.  This results in a time reduction of over
50% (i.e. 2x speed improvemnet) for some smaller sizes for memcpy-walk.
Larger sizes show improvements of around 1% to 2%.  memcpy-random shows
a very small improvement, in the range of 1-2%.

	* sysdeps/aarch64/multiarch/memcpy_falkor.S (__memcpy_falkor):
	Use vector registers.


this is ok to commit.

References:
- [PATCH 1/2] aarch64,falkor: Use vector registers for memmove
  - From: Siddhesh Poyarekar
- [PATCH 2/2] aarch64,falkor: Use vector registers for copy
  - From: Siddhesh Poyarekar

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