From: wei.guo.simon@gmail.com
To: linuxppc-dev@lists.ozlabs.org
Cc: Paul Mackerras <paulus@ozlabs.org>,
Michael Ellerman <mpe@ellerman.id.au>,
"Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>,
Simon Guo <wei.guo.simon@gmail.com>
Subject: [PATCH v1 0/3] powerpc: memcmp() optimization
Date: Tue, 19 Sep 2017 18:03:56 +0800 [thread overview]
Message-ID: <1505815439-18720-1-git-send-email-wei.guo.simon@gmail.com> (raw)
From: Simon Guo <wei.guo.simon@gmail.com>
There is some room to optimize memcmp() in powerpc for following 2 cases:
(1) Even src/dst addresses are not aligned with 8 bytes at the beginning,
memcmp() can align them and go with .Llong comparision mode without
fallback to .Lshort comparision mode do compare buffer byte by byte.
(2) VMX instructions can be used to speed up for large size comparision.
This patch set also updates selftest case to make it compiled.
Simon Guo (3):
powerpc: Align bytes before fall back to .Lshort in powerpc memcmp
powerpc: enhance memcmp() with VMX instruction for long bytes
comparision
powerpc:selftest update memcmp selftest according to kernel change
arch/powerpc/include/asm/asm-prototypes.h | 2 +-
arch/powerpc/lib/copypage_power7.S | 2 +-
arch/powerpc/lib/memcmp_64.S | 165 ++++++++++++++++++++-
arch/powerpc/lib/memcpy_power7.S | 2 +-
arch/powerpc/lib/vmx-helper.c | 2 +-
.../selftests/powerpc/copyloops/asm/ppc_asm.h | 2 +-
.../selftests/powerpc/stringloops/asm/ppc_asm.h | 31 ++++
7 files changed, 197 insertions(+), 9 deletions(-)
--
1.8.3.1
next reply other threads:[~2017-09-19 10:04 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-19 10:03 wei.guo.simon [this message]
2017-09-19 10:03 ` [PATCH v1 1/3] powerpc: Align bytes before fall back to .Lshort in powerpc memcmp wei.guo.simon
2017-09-19 10:12 ` David Laight
2017-09-20 9:56 ` Simon Guo
2017-09-20 10:05 ` David Laight
2017-09-19 12:20 ` Christophe LEROY
2017-09-19 10:03 ` [PATCH v1 2/3] powerpc: enhance memcmp() with VMX instruction for long bytes comparision wei.guo.simon
2017-09-19 10:03 ` [PATCH v1 3/3] powerpc:selftest update memcmp selftest according to kernel change wei.guo.simon
2017-09-19 12:21 ` [PATCH v1 0/3] powerpc: memcmp() optimization Christophe LEROY
2017-09-20 9:57 ` Simon Guo
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