1 /* NG4fls.S: SPARC optimized fls and __fls for 1 /* NG4fls.S: SPARC optimized fls and __fls for T4 and above.
2 * 2 *
3 * Copyright (c) 2017, Oracle and/or its affil 3 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
4 */ 4 */
5 5
6 #include <linux/linkage.h> 6 #include <linux/linkage.h>
7 7
8 #define LZCNT_O0_G2 \ 8 #define LZCNT_O0_G2 \
9 .word 0x85b002e8 9 .word 0x85b002e8
10 10
11 .text 11 .text
12 .register %g2, #scratch 12 .register %g2, #scratch
13 .register %g3, #scratch 13 .register %g3, #scratch
14 14
15 ENTRY(NG4fls) 15 ENTRY(NG4fls)
16 LZCNT_O0_G2 !lzcnt %o0, %g2 16 LZCNT_O0_G2 !lzcnt %o0, %g2
17 mov 64, %g3 17 mov 64, %g3
18 retl 18 retl
19 sub %g3, %g2, %o0 19 sub %g3, %g2, %o0
20 ENDPROC(NG4fls) 20 ENDPROC(NG4fls)
21 21
22 ENTRY(__NG4fls) 22 ENTRY(__NG4fls)
23 brz,pn %o0, 1f 23 brz,pn %o0, 1f
24 LZCNT_O0_G2 !lzcnt %o0, %g2 24 LZCNT_O0_G2 !lzcnt %o0, %g2
25 mov 63, %g3 25 mov 63, %g3
26 sub %g3, %g2, %o0 26 sub %g3, %g2, %o0
27 1: 27 1:
28 retl 28 retl
29 nop 29 nop
30 ENDPROC(__NG4fls) 30 ENDPROC(__NG4fls)
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