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glibc/ports/sysdeps/alpha/alphaev67/strncat.S
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/* Copyright (C) 2000, 2001 Free Software Foundation, Inc. | |
Contributed by Richard Henderson <rth@tamu.edu>, 1996. | |
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/>. */ | |
/* Append no more than COUNT characters from the null-terminated string SRC | |
to the null-terminated string DST. Always null-terminate the new DST. */ | |
#include <sysdep.h> | |
.arch ev6 | |
.set noreorder | |
.text | |
ENTRY(strncat) | |
ldgp gp, 0(pv) | |
#ifdef PROF | |
.set noat | |
lda AT, _mcount | |
jsr AT, (AT), _mcount | |
.set at | |
#endif | |
.prologue 1 | |
mov a0, v0 # set up return value | |
beq a2, $zerocount # U : | |
/* Find the end of the string. */ | |
ldq_u t0, 0(a0) # L : load first quadword (a0 may be misaligned) | |
lda t1, -1 # E : | |
insqh t1, v0, t1 # U : | |
andnot a0, 7, a0 # E : | |
nop # E : | |
or t1, t0, t0 # E : | |
nop # E : | |
nop # E : | |
cmpbge zero, t0, t1 # E : bits set iff byte == 0 | |
bne t1, $found # U : | |
$loop: ldq t0, 8(a0) # L : | |
addq a0, 8, a0 # E : | |
cmpbge zero, t0, t1 # E : | |
beq t1, $loop # U : | |
$found: cttz t1, t2 # U0 : | |
addq a0, t2, a0 # E : | |
jsr t9, __stxncpy # L0 : Now do the append. | |
/* Worry about the null termination. */ | |
cttz t10, t2 # U0: byte offset of end-of-count. | |
bic a0, 7, a0 # E : word align the last write address. | |
zapnot t0, t8, t1 # U : was last byte a null? | |
nop # E : | |
bne t1, 0f # U : | |
nop # E : | |
nop # E : | |
ret # L0 : | |
0: addq t2, a0, a0 # E : address of end-of-count | |
stb zero, 1(a0) # L : | |
nop # E : | |
ret # L0 : | |
$zerocount: | |
nop # E : | |
nop # E : | |
nop # E : | |
ret # L0 : | |
END(strncat) |