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Fix .type directive to use the right name for L_ffs_table (pointed out by

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Ian Fry).

Also, add RCSID and fix some comments.
This commit is contained in:
bjh21 2001-11-13 13:07:52 +00:00
parent 13ac430285
commit 49ddb29842
1 changed files with 11 additions and 8 deletions
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19
lib/libc/arch/arm/string/ffs.S
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@ -1,4 +1,4 @@
/* $NetBSD: ffs.S,v 1.1 2001/11/11 22:05:19 chris Exp $ */
/* $NetBSD: ffs.S,v 1.2 2001/11/13 13:07:52 bjh21 Exp $ */
/*
* Copyright (c) 2001 Christopher Gilbert
* All rights reserved.
@ -30,18 +30,21 @@
#include <machine/asm.h>
/* ffs - find first set bit, this algorithm multiplies the number by
* 0x0450fbaf which leaves the top 6 bits as an index into the table.
* This algorithm should be a win over the checking each bit in turn as per
* the C compiled version.
RCSID("$NetBSD: ffs.S,v 1.2 2001/11/13 13:07:52 bjh21 Exp $")
/*
* ffs - find first set bit, this algorithm isolates the first set
* bit, then multiplies the number by 0x0450fbaf which leaves the top
* 6 bits as an index into the table. This algorithm should be a win
* over the checking each bit in turn as per the C compiled version.
*
* under Arm v5 there's an instruction called CLZ (count leading Zero's) that
* under ARMv5 there's an instruction called CLZ (count leading Zero's) that
* could be used
*
* This is the ffs algorithm devised by d.seal and posted to comp.sys.arm on
* 16 Feb 1994.
*/
ENTRY(ffs)
/* Standard trick to isolate bottom bit in a0 or 0 if r0 = 0 on entry */
rsb r1, r0, #0
@ -64,7 +67,7 @@ ENTRY(ffs)
mov pc, lr
#endif
.text;
.type Lffs_table, _ASM_TYPE_OBJECT;
.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 */