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
Subject: [PATCH 0/2] sparc64: Optimize fls, fls64 and __fls
Date: Tue, 26 Sep 2017 23:59:10 -0600 [thread overview]
Message-ID: <1506491952-9659-1-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.
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 5:59 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-27 5:59 Vijay Kumar [this message]
2017-09-27 5:59 ` [PATCH 1/2] sparc64: Define SPARC default fls " Vijay Kumar
2017-09-27 5:59 ` [PATCH 2/2] sparc64: Use lzcnt instruction for " Vijay Kumar
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