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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>
hifive-unleashed-5.1
Vijay Kumar 2017-10-11 12:50:05 -06:00 committed by David S. Miller
parent 70cbec0c53
commit 2b41ce5df2
1 changed files with 10 additions and 0 deletions
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10
arch/sparc/lib/NG4fls.S
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@ -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)