From: Vijay Kumar <vijay.ac.kumar@oracle.com>
Date: Wed, 11 Oct 2017 18:50:05 +0000 (-0600)
Subject: sparc64: SPARC optimized __fls function
X-Git-Tag: v4.15-rc1~42^2~4^2~1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2b41ce5df20b698436526fcd8478094140b91706;p=thirdparty%2Flinux.git

sparc64: SPARC optimized __fls function

Defined SPARC optimized __fls using lzcnt opcode.

Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/arch/sparc/lib/NG4fls.S b/arch/sparc/lib/NG4fls.S
index bc17b65f10526..2d0991e5b0341 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)