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Use bfffo rather than a slow loop.

This commit is contained in:
mycroft 1994-09-09 03:07:23 +00:00
parent e0fa548a12
commit 6ba85483c3
2 changed files with 16 additions and 20 deletions
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18
lib/libc/arch/m68k/string/ffs.S
View File

@ -38,7 +38,7 @@
#if defined(LIBC_SCCS) && !defined(lint)
.text
/*.asciz "from: @(#)ffs.s 5.1 (Berkeley) 5/12/90"*/
.asciz "$Id: ffs.S,v 1.2 1993/11/30 00:45:15 paulus Exp $"
.asciz "$Id: ffs.S,v 1.3 1994/09/09 03:09:03 mycroft Exp $"
#endif /* LIBC_SCCS and not lint */
/* bit = ffs(value) */
@ -46,13 +46,11 @@
#include "DEFS.h"
ENTRY(ffs)
moveq #-1,d0
movl sp@(4),d1
jeq done
again:
addql #1,d0
btst d0,d1
jeq again
done:
addql #1,d0
movl sp@(4),d0
movl d0,d1
negl d0
andl d0,d1
movql #32,d0
bfffo d1{#0:#32},d1
subl d1,d0
rts

18
sys/lib/libkern/arch/m68k/ffs.S
View File

@ -38,7 +38,7 @@
#if defined(LIBC_SCCS) && !defined(lint)
.text
/*.asciz "from: @(#)ffs.s 5.1 (Berkeley) 5/12/90"*/
.asciz "$Id: ffs.S,v 1.1 1994/03/29 07:14:47 chopps Exp $"
.asciz "$Id: ffs.S,v 1.2 1994/09/09 03:07:23 mycroft Exp $"
#endif /* LIBC_SCCS and not lint */
/* bit = ffs(value) */
@ -46,13 +46,11 @@
#include "DEFS.h"
ENTRY(ffs)
moveq #-1,d0
movl sp@(4),d1
jeq done
again:
addql #1,d0
btst d0,d1
jeq again
done:
addql #1,d0
movl sp@(4),d0
movl d0,d1
negl d0
andl d0,d1
movql #32,d0
bfffo d1{#0:#32},d1
subl d1,d0
rts