From: Vijay Kumar <vijay.ac.kumar@oracle.com>
To: davem@davemloft.net
Cc: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org,
babu.moger@oracle.com, rob.gardner@oracle.com
Subject: [PATCH v2 0/2] sparc64: Optimize fls, fls64 and __fls
Date: Wed, 27 Sep 2017 13:25:24 -0600 [thread overview]
Message-ID: <1506540326-9604-1-git-send-email-vijay.ac.kumar@oracle.com> (raw)
SPARC provides lzcnt instruction (with VIS3) which can be used to
optimize fls, fls64 and __fls functions. For the systems that supports
lzcnt instruction, we now do boot time patching to use sparc
optimized fls, fls64 and __fls functions.
v1->v2:
- Fixed delay slot issue pointed by Rob Gardner in patch 2/2.
Vijay Kumar (2):
sparc64: Define SPARC default fls and __fls
sparc64: Use lzcnt instruction for fls and __fls
arch/sparc/Makefile | 1 +
arch/sparc/include/asm/bitops_64.h | 7 +-
arch/sparc/kernel/head_64.S | 2 +
arch/sparc/lib/Makefile | 4 +
arch/sparc/lib/NG4fls.S | 31 +++++++++
arch/sparc/lib/NG4patch.S | 9 +++
arch/sparc/lib/fls.S | 126 ++++++++++++++++++++++++++++++++++++
7 files changed, 177 insertions(+), 3 deletions(-)
create mode 100644 arch/sparc/lib/NG4fls.S
create mode 100644 arch/sparc/lib/fls.S
next reply other threads:[~2017-09-27 19:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-27 19:25 Vijay Kumar [this message]
2017-09-27 19:25 ` [PATCH v2 1/2] sparc64: Define SPARC default fls " Vijay Kumar
2017-09-27 19:50 ` Sam Ravnborg
2017-09-27 19:59 ` Sam Ravnborg
2017-09-27 19:25 ` [PATCH v2 2/2] sparc64: Use lzcnt instruction for " Vijay Kumar
2017-09-27 19:56 ` Sam Ravnborg
2017-09-27 20:29 ` Vijay Kumar
2017-09-27 21:02 ` David Miller
2017-09-27 21:45 ` Anthony Yznaga
2017-09-27 22:10 ` David Miller
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