linux-kernel - [PATCH v4 4/5] sparc64: SPARC optimized _

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Message-Id: <1507747806-10251-5-git-send-email-vijay.ac.kumar@oracle.com>
Date:   Wed, 11 Oct 2017 12:50:05 -0600
From:   Vijay Kumar <vijay.ac.kumar@...cle.com>
To:     davem@...emloft.net
Cc:     linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org,
        babu.moger@...cle.com, rob.gardner@...cle.com, sam@...nborg.org,
        anthony.yznaga@...cle.com
Subject: [PATCH v4 4/5] sparc64: SPARC optimized __fls function

Defined SPARC optimized __fls using lzcnt opcode.

Signed-off-by: Vijay Kumar <vijay.ac.kumar@...cle.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