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On the 68010 only, assemble a different version of 

this function, since the 68010 doesn't have bit
instructions.
This commit is contained in:
fredette 2001-05-17 21:26:06 +00:00
parent 3085bd52b8
commit 77f5240b49
1 changed files with 20 additions and 2 deletions
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22
lib/libc/arch/m68k/string/ffs.S
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@ -1,4 +1,4 @@
/* $NetBSD: ffs.S,v 1.7 1999/10/25 23:48:15 thorpej Exp $ */
/* $NetBSD: ffs.S,v 1.8 2001/05/17 21:26:06 fredette Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
@ -43,12 +43,14 @@
#if 0
RCSID("from: @(#)ffs.s 5.1 (Berkeley) 5/12/90")
#else
RCSID("$NetBSD: ffs.S,v 1.7 1999/10/25 23:48:15 thorpej Exp $")
RCSID("$NetBSD: ffs.S,v 1.8 2001/05/17 21:26:06 fredette Exp $")
#endif
#endif /* LIBC_SCCS and not lint */
/* bit = ffs(value) */
#ifndef __mc68010__
ENTRY(ffs)
movl %sp@(4),%d0
movl %d0,%d1
@ -58,3 +60,19 @@ ENTRY(ffs)
bfffo %d1{#0:#32},%d1
subl %d1,%d0
rts
#else /* __mc68010__ */
ENTRY(ffs)
movl %sp@(4),%d0
jeq L2
movql #31,%d1
L1:
lsrl #1,%d0
dbcs %d1,L1
movql #32,%d0
subl %d1,%d0
L2:
rts
#endif /* __mc68010__ */