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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,
	anthony.yznaga@oracle.com
Subject: [PATCH v4 4/5] sparc64: SPARC optimized __fls function
Date: Wed, 11 Oct 2017 12:50:05 -0600	[thread overview]
Message-ID: <1507747806-10251-5-git-send-email-vijay.ac.kumar@oracle.com> (raw)
In-Reply-To: <1507747806-10251-1-git-send-email-vijay.ac.kumar@oracle.com>

Defined SPARC optimized __fls using lzcnt opcode.

Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
---
 arch/sparc/lib/NG4fls.S |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/sparc/lib/NG4fls.S b/arch/sparc/lib/NG4fls.S
index bc17b65..2d0991e 100644
--- a/arch/sparc/lib/NG4fls.S
+++ b/arch/sparc/lib/NG4fls.S
@@ -18,3 +18,13 @@ ENTRY(NG4fls)
 	retl
 	 sub	%g3, %g2, %o0
 ENDPROC(NG4fls)
+
+ENTRY(__NG4fls)
+	brz,pn	%o0, 1f
+	LZCNT_O0_G2	!lzcnt	%o0, %g2
+	mov	63, %g3
+	sub	%g3, %g2, %o0
+1:
+	retl
+	 nop
+ENDPROC(__NG4fls)
-- 
1.7.1

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,
	anthony.yznaga@oracle.com
Subject: [PATCH v4 4/5] sparc64: SPARC optimized __fls function
Date: Wed, 11 Oct 2017 18:50:05 +0000	[thread overview]
Message-ID: <1507747806-10251-5-git-send-email-vijay.ac.kumar@oracle.com> (raw)
In-Reply-To: <1507747806-10251-1-git-send-email-vijay.ac.kumar@oracle.com>

Defined SPARC optimized __fls using lzcnt opcode.

Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
---
 arch/sparc/lib/NG4fls.S |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/sparc/lib/NG4fls.S b/arch/sparc/lib/NG4fls.S
index bc17b65..2d0991e 100644
--- a/arch/sparc/lib/NG4fls.S
+++ b/arch/sparc/lib/NG4fls.S
@@ -18,3 +18,13 @@ ENTRY(NG4fls)
 	retl
 	 sub	%g3, %g2, %o0
 ENDPROC(NG4fls)
+
+ENTRY(__NG4fls)
+	brz,pn	%o0, 1f
+	LZCNT_O0_G2	!lzcnt	%o0, %g2
+	mov	63, %g3
+	sub	%g3, %g2, %o0
+1:
+	retl
+	 nop
+ENDPROC(__NG4fls)
-- 
1.7.1


  parent reply	other threads:[~2017-10-11 18:51 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-11 18:50 [PATCH v4 0/5] sparc64: Optimize fls and __fls Vijay Kumar
2017-10-11 18:50 ` Vijay Kumar
2017-10-11 18:50 ` [PATCH v4 1/5] sparc64: Define SPARC default fls function Vijay Kumar
2017-10-11 18:50   ` Vijay Kumar
2017-10-11 18:50 ` [PATCH v4 2/5] sparc64: Define SPARC default __fls function Vijay Kumar
2017-10-11 18:50   ` Vijay Kumar
2017-10-11 18:50 ` [PATCH v4 3/5] sparc64: SPARC optimized fls function Vijay Kumar
2017-10-11 18:50   ` Vijay Kumar
2017-10-11 18:50 ` Vijay Kumar [this message]
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
2017-10-11 18:50   ` Vijay Kumar
2017-10-12 20:29 ` [PATCH v4 0/5] sparc64: Optimize fls and __fls Babu Moger
2017-10-12 20:29   ` Babu Moger
2017-11-15  5:27 ` David Miller
2017-11-15  5:27   ` David Miller

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