/* Copyright (C) 2000-2018 Free Software Foundation, Inc.

   Contributed by David Mosberger (davidm@cs.arizona.edu).

   EV67 optimized by Rick Gorton <rick.gorton@alpha-processor.com>.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library.  If not, see

   <http://www.gnu.org/licenses/>.  */

/* Finds length of a 0-terminated string.  */

#include <sysdep.h>

	.arch ev6

	.set noreorder

	.set noat

ENTRY(strlen)

#ifdef PROF

	ldgp	gp, 0(pv)

	lda	AT, _mcount

	jsr	AT, (AT), _mcount

	.prologue 1

#else

	.prologue 0

#endif

	ldq_u	$1, 0($16)	# L : load first quadword ($16 may be misaligned)

	lda	$2, -1($31)	# E :

	insqh	$2, $16, $2	# U :

	andnot	$16, 7, $0	# E :

	or	$2, $1, $1	# E :

	cmpbge	$31, $1, $2	# E : $2  <- bitmask: bit i == 1 <==> i-th byte == 0

	nop			# E :

	bne	$2, $found	# U :

$loop:	ldq	$1, 8($0)	# L :

	addq	$0, 8, $0	# E : addr += 8

	cmpbge	$31, $1, $2	# E :

	beq	$2, $loop	# U :

$found:

	cttz	$2, $3		# U0 :

	addq	$0, $3, $0	# E :

	subq	$0, $16, $0	# E :

	ret	$31, ($26)	# L0 :

	END(strlen)

libc_hidden_builtin_def (strlen)