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
Subject: [PATCH v3 0/5] sparc64: Optimize fls and __fls
Date: Fri, 6 Oct 2017 10:54:48 -0600 [thread overview]
Message-ID: <1507308893-9218-1-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.
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 (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:[~2017-10-06 16:55 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-06 16:54 Vijay Kumar [this message]
2017-10-06 16:54 ` [PATCH v3 1/5] sparc64: Define SPARC default fls function Vijay Kumar
2017-10-06 16:54 ` [PATCH v3 2/5] sparc64: Define SPARC default __fls function Vijay Kumar
2017-10-06 16:54 ` [PATCH v3 3/5] sparc64: SPARC optimised fls function Vijay Kumar
2017-10-06 23:28 ` Anthony Yznaga
2017-10-09 4:39 ` David Miller
2017-10-09 15:12 ` Vijay Kumar
2017-10-06 16:54 ` [PATCH v3 4/5] sparc64: SPARC optimised __fls function Vijay Kumar
2017-10-06 16:54 ` [PATCH v3 5/5] sparc64: Use sparc optimised fls and __fls for T4 and above Vijay Kumar
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