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sparc64: SPARC optimized fls function

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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>
This commit is contained in:
Vijay Kumar
2017-10-11 12:50:04 -06:00
committed by David S. Miller
parent be52bbe3ea
commit 70cbec0c53
2 changed files with 21 additions and 0 deletions
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20
arch/sparc/lib/NG4fls.S Normal file
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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)