From: Anton Blanchard <anton@samba.org>
Date: Thu, 18 Sep 2014 23:40:20 +0000 (+1000)
Subject: powerpc: ppc64le optimised word at a time
X-Git-Tag: fixes-against-v3.18-rc2~117^2~59
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8989aa4adacd02174d1f72a00af8d669934a2b7a;p=pandora-kernel.git

powerpc: ppc64le optimised word at a time

Use cmpb which compares each byte in two 64 bit values and
for each matching byte places 0xff in the target and 0x00
otherwise.

A simple hash_name microbenchmark:

http://ozlabs.org/~anton/junkcode/hash_name_bench.c

shows this version to be 10-20% faster than running the x86
version on POWER8, depending on the length.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---

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