Commit 70cbec0c authored by Vijay Kumar's avatar Vijay Kumar Committed by David S. Miller
Browse files

sparc64: SPARC optimized fls function 



Defined SPARC optimized fls using lzcnt opcode.

Signed-off-by: default avatarVijay Kumar <vijay.ac.kumar@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent be52bbe3

arch/sparc/lib/Makefile

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@@ -18,6 +18,7 @@ lib-$(CONFIG_SPARC32) += muldi3.o bitext.o cmpdi2.o 
lib-$(CONFIG_SPARC64) += multi3.o

lib-$(CONFIG_SPARC64) += fls.o

lib-$(CONFIG_SPARC64) += fls64.o

obj-$(CONFIG_SPARC64) += NG4fls.o



lib-$(CONFIG_SPARC64) += copy_page.o clear_page.o bzero.o

lib-$(CONFIG_SPARC64) += csum_copy.o csum_copy_from_user.o csum_copy_to_user.o

arch/sparc/lib/NG4fls.S

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/* NG4fls.S: SPARC optimized fls and __fls for T4 and above.

 *

 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

 */



#include <linux/linkage.h>



#define LZCNT_O0_G2	\

	.word	0x85b002e8



	.text

	.register	%g2, #scratch

	.register	%g3, #scratch



ENTRY(NG4fls)

	LZCNT_O0_G2	!lzcnt	%o0, %g2

	mov	64, %g3

	retl

	 sub	%g3, %g2, %o0

ENDPROC(NG4fls)