1/* Copyright (C) 2000-2022 Free Software Foundation, Inc.
2   This file is part of the GNU C Library.
3
4   The GNU C Library is free software; you can redistribute it and/or
5   modify it under the terms of the GNU Lesser General Public
6   License as published by the Free Software Foundation; either
7   version 2.1 of the License, or (at your option) any later version.
8
9   The GNU C Library is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12   Lesser General Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public
15   License along with the GNU C Library.  If not, see
16   <https://www.gnu.org/licenses/>.  */
17
18/* Finds length of a 0-terminated string.  */
19
20#include <sysdep.h>
21
22	.arch ev6
23	.set noreorder
24	.set noat
25
26ENTRY(strlen)
27#ifdef PROF
28	ldgp	gp, 0(pv)
29	lda	AT, _mcount
30	jsr	AT, (AT), _mcount
31	.prologue 1
32#else
33	.prologue 0
34#endif
35
36	ldq_u	$1, 0($16)	# L : load first quadword ($16 may be misaligned)
37	lda	$2, -1($31)	# E :
38	insqh	$2, $16, $2	# U :
39	andnot	$16, 7, $0	# E :
40
41	or	$2, $1, $1	# E :
42	cmpbge	$31, $1, $2	# E : $2  <- bitmask: bit i == 1 <==> i-th byte == 0
43	nop			# E :
44	bne	$2, $found	# U :
45
46$loop:	ldq	$1, 8($0)	# L :
47	addq	$0, 8, $0	# E : addr += 8
48	cmpbge	$31, $1, $2	# E :
49	beq	$2, $loop	# U :
50
51$found:
52	cttz	$2, $3		# U0 :
53	addq	$0, $3, $0	# E :
54	subq	$0, $16, $0	# E :
55	ret	$31, ($26)	# L0 :
56
57	END(strlen)
58libc_hidden_builtin_def (strlen)
59