mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 12:41:05 +00:00
61 lines
1.6 KiB
ArmAsm
61 lines
1.6 KiB
ArmAsm
/* Copyright (C) 2000-2016 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)
|