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, sam@ravnborg.org,
anthony.yznaga@oracle.com
Subject: [PATCH v4 0/5] sparc64: Optimize fls and __fls
Date: Wed, 11 Oct 2017 12:50:01 -0600 [thread overview]
Message-ID: <1507747806-10251-1-git-send-email-vijay.ac.kumar@oracle.com> (raw)
SPARC provides lzcnt instruction (with VIS3) which can be used to
optimize fls, __fls and fls64 functions. For the systems that supports
lzcnt instruction, we now do boot time patching to use sparc
optimized fls, __fls and fls64 functions.
v3->v4:
- Fixed a typo.
v2->v3:
- Using ENTRY(), ENDPROC() for assembler functions.
- Removed BITS_PER_LONG from __fls.
- Using generic fls64().
- Replaced lzcnt instruction with .word directive.
v1->v2:
- Fixed delay slot issue.
Vijay Kumar (5):
sparc64: Define SPARC default fls function
sparc64: Define SPARC default __fls function
sparc64: SPARC optimized fls function
sparc64: SPARC optimized __fls function
sparc64: Use sparc optimized fls and __fls for T4 and above
arch/sparc/include/asm/bitops_64.h | 5 ++-
arch/sparc/kernel/head_64.S | 2 +
arch/sparc/lib/Makefile | 3 ++
arch/sparc/lib/NG4fls.S | 30 ++++++++++++++++
arch/sparc/lib/NG4patch.S | 9 +++++
arch/sparc/lib/fls.S | 67 ++++++++++++++++++++++++++++++++++++
arch/sparc/lib/fls64.S | 61 ++++++++++++++++++++++++++++++++
7 files changed, 175 insertions(+), 2 deletions(-)
create mode 100644 arch/sparc/lib/NG4fls.S
create mode 100644 arch/sparc/lib/fls.S
create mode 100644 arch/sparc/lib/fls64.S
next reply other threads:[~2017-10-11 18:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-11 18:50 Vijay Kumar [this message]
2017-10-11 18:50 ` [PATCH v4 1/5] sparc64: Define SPARC default fls function Vijay Kumar
2017-10-11 18:50 ` [PATCH v4 2/5] sparc64: Define SPARC default __fls function Vijay Kumar
2017-10-11 18:50 ` [PATCH v4 3/5] sparc64: SPARC optimized fls function Vijay Kumar
2017-10-11 18:50 ` [PATCH v4 4/5] sparc64: SPARC optimized __fls function Vijay Kumar
2017-10-11 18:50 ` [PATCH v4 5/5] sparc64: Use sparc optimized fls and __fls for T4 and above Vijay Kumar
2017-10-12 20:29 ` [PATCH v4 0/5] sparc64: Optimize fls and __fls Babu Moger
2017-11-15 5:27 ` David Miller
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