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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

WARNING: multiple messages have this Message-ID (diff)
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, 06 Oct 2017 16:54:48 +0000	[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


             reply	other threads:[~2017-10-06 16:55 UTC|newest]

Thread overview: 18+ 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 0/5] sparc64: Optimize fls and __fls Vijay Kumar
2017-10-06 16:54 ` [PATCH v3 1/5] sparc64: Define SPARC default fls function Vijay Kumar
2017-10-06 16:54   ` Vijay Kumar
2017-10-06 16:54 ` [PATCH v3 2/5] sparc64: Define SPARC default __fls function Vijay Kumar
2017-10-06 16:54   ` Vijay Kumar
2017-10-06 16:54 ` [PATCH v3 3/5] sparc64: SPARC optimised fls function Vijay Kumar
2017-10-06 16:54   ` Vijay Kumar
2017-10-06 23:28   ` Anthony Yznaga
2017-10-06 23:28     ` Anthony Yznaga
2017-10-09  4:39   ` David Miller
2017-10-09  4:39     ` David Miller
2017-10-09 15:12     ` Vijay Kumar
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   ` Vijay Kumar
2017-10-06 16:54 ` [PATCH v3 5/5] sparc64: Use sparc optimised fls and __fls for T4 and above Vijay Kumar
2017-10-06 16:54   ` Vijay Kumar

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