glibc/sysdeps/alpha/alphaev67/strlen.S
Andreas Jaeger 41bdb6e20c Update to LGPL v2.1.
2001-07-06  Paul Eggert  <eggert@twinsun.com>

	* manual/argp.texi: Remove ignored LGPL copyright notice; it's
	not appropriate for documentation anyway.
	* manual/libc-texinfo.sh: "Library General Public License" ->
	"Lesser General Public License".

2001-07-06  Andreas Jaeger  <aj@suse.de>

	* All files under GPL/LGPL version 2: Place under LGPL version
	2.1.
2001-07-06 04:58:11 +00:00

61 lines
1.7 KiB
ArmAsm

/* Copyright (C) 2000 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/* 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)