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| author | Andrew Turner <andrew@FreeBSD.org> | 2021-01-28 10:41:45 +0000 |
|---|---|---|
| committer | Andrew Turner <andrew@FreeBSD.org> | 2021-01-28 10:41:45 +0000 |
| commit | 4e76e4c301c72698e111580e278872a8323fba50 (patch) | |
| tree | 8d4a8fbfc9598f6f74a299b2e83bbd3bc111393a /sys/libkern | |
| parent | 4d2ff2330f515b0a42b83113a201de48c0f38f7a (diff) | |
| download | src-4e76e4c301c72698e111580e278872a8323fba50.tar.gz src-4e76e4c301c72698e111580e278872a8323fba50.zip | |
Diffstat (limited to 'sys/libkern')
| -rw-r--r-- | sys/libkern/arm/ffs.S | 29 |
1 files changed, 0 insertions, 29 deletions
diff --git a/sys/libkern/arm/ffs.S b/sys/libkern/arm/ffs.S index 1ddec95de0b1..871ca64b9a84 100644 --- a/sys/libkern/arm/ffs.S +++ b/sys/libkern/arm/ffs.S @@ -51,37 +51,8 @@ ENTRY(ffs) /* Standard trick to isolate bottom bit in r0 or 0 if r0 = 0 on entry */ rsb r1, r0, #0 ands r0, r0, r1 -#ifndef _ARM_ARCH_5 - - /* - * now r0 has at most one set bit, call this X - * if X = 0, all further instructions are skipped - */ - adrne r2, .L_ffs_table - orrne r0, r0, r0, lsl #4 /* r0 = X * 0x11 */ - orrne r0, r0, r0, lsl #6 /* r0 = X * 0x451 */ - rsbne r0, r0, r0, lsl #16 /* r0 = X * 0x0450fbaf */ - - /* now lookup in table indexed on top 6 bits of r0 */ - ldrbne r0, [ r2, r0, lsr #26 ] - - RET -.text; -.type .L_ffs_table, _ASM_TYPE_OBJECT; -.L_ffs_table: -/* 0 1 2 3 4 5 6 7 */ - .byte 0, 1, 2, 13, 3, 7, 0, 14 /* 0- 7 */ - .byte 4, 0, 8, 0, 0, 0, 0, 15 /* 8-15 */ - .byte 11, 5, 0, 0, 9, 0, 0, 26 /* 16-23 */ - .byte 0, 0, 0, 0, 0, 22, 28, 16 /* 24-31 */ - .byte 32, 12, 6, 0, 0, 0, 0, 0 /* 32-39 */ - .byte 10, 0, 0, 25, 0, 0, 21, 27 /* 40-47 */ - .byte 31, 0, 0, 0, 0, 24, 0, 20 /* 48-55 */ - .byte 30, 0, 23, 19, 29, 18, 17, 0 /* 56-63 */ -#else clzne r0, r0 rsbne r0, r0, #32 RET -#endif END(ffs) |