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 bc17b65..2d0991e 100644 (file)
--- 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)