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glibc/ports/sysdeps/alpha/alphaev67/stpncpy.S
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/* Copyright (C) 2000, 2002 Free Software Foundation, Inc. | |
Contributed by Richard Henderson (rth@redhat.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/>. */ | |
/* Copy no more then N bytes from SRC to DEST, returning the address of | |
the terminating '\0' in DEST. */ | |
#include <sysdep.h> | |
.arch ev6 | |
.set noat | |
.set noreorder | |
.text | |
ENTRY(__stpncpy) | |
ldgp gp, 0(pv) | |
#ifdef PROF | |
lda AT, _mcount | |
jsr AT, (AT), _mcount | |
#endif | |
.prologue 1 | |
mov a0, v0 | |
beq a2, $zerocount | |
.align 4 | |
nop | |
nop | |
jsr t9, __stxncpy # do the work of the copy | |
cttz t8, t4 | |
zapnot t0, t8, t5 | |
andnot a0, 7, a0 | |
bne a2, $multiword # do we have full words left? | |
subq t8, 1, t2 | |
subq t10, 1, t3 | |
cmpult zero, t5, t5 | |
addq a0, t4, v0 | |
or t2, t8, t2 | |
or t3, t10, t3 | |
addq v0, t5, v0 | |
andnot t3, t2, t3 | |
zap t0, t3, t0 | |
nop | |
stq t0, 0(a0) | |
ret | |
$multiword: | |
subq t8, 1, t7 # clear the final bits in the prev word | |
cmpult zero, t5, t5 | |
or t7, t8, t7 | |
zapnot t0, t7, t0 | |
subq a2, 1, a2 | |
stq t0, 0(a0) | |
addq a0, 8, a1 | |
beq a2, 1f # loop over full words remaining | |
nop | |
nop | |
nop | |
blbc a2, 0f | |
stq zero, 0(a1) | |
subq a2, 1, a2 | |
addq a1, 8, a1 | |
beq a2, 1f | |
0: stq zero, 0(a1) | |
subq a2, 2, a2 | |
nop | |
nop | |
stq zero, 8(a1) | |
addq a1, 16, a1 | |
nop | |
bne a2, 0b | |
1: ldq t0, 0(a1) # clear the leading bits in the final word | |
subq t10, 1, t7 | |
addq a0, t4, v0 | |
nop | |
or t7, t10, t7 | |
addq v0, t5, v0 | |
zap t0, t7, t0 | |
stq t0, 0(a1) | |
$zerocount: | |
nop | |
nop | |
nop | |
ret | |
END(__stpncpy) | |
libc_hidden_def (__stpncpy) | |
weak_alias (__stpncpy, stpncpy) |