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88 lines
2.2 KiB
ArmAsm
88 lines
2.2 KiB
ArmAsm
/* Copyright (C) 2000-2016 Free Software Foundation, Inc.
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Contributed by Richard Henderson <rth@tamu.edu>, 1996.
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EV67 optimized by Rick Gorton <rick.gorton@alpha-processor.com>.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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/* Append no more than COUNT characters from the null-terminated string SRC
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to the null-terminated string DST. Always null-terminate the new DST. */
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#include <sysdep.h>
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.arch ev6
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.set noreorder
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.text
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ENTRY(strncat)
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ldgp gp, 0(pv)
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#ifdef PROF
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.set noat
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lda AT, _mcount
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jsr AT, (AT), _mcount
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.set at
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#endif
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.prologue 1
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mov a0, v0 # set up return value
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beq a2, $zerocount # U :
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/* Find the end of the string. */
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ldq_u t0, 0(a0) # L : load first quadword (a0 may be misaligned)
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lda t1, -1 # E :
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insqh t1, v0, t1 # U :
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andnot a0, 7, a0 # E :
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nop # E :
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or t1, t0, t0 # E :
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nop # E :
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nop # E :
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cmpbge zero, t0, t1 # E : bits set iff byte == 0
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bne t1, $found # U :
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$loop: ldq t0, 8(a0) # L :
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addq a0, 8, a0 # E :
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cmpbge zero, t0, t1 # E :
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beq t1, $loop # U :
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$found: cttz t1, t2 # U0 :
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addq a0, t2, a0 # E :
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jsr t9, __stxncpy # L0 : Now do the append.
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/* Worry about the null termination. */
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cttz t10, t2 # U0: byte offset of end-of-count.
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bic a0, 7, a0 # E : word align the last write address.
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zapnot t0, t8, t1 # U : was last byte a null?
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nop # E :
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bne t1, 0f # U :
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nop # E :
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nop # E :
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ret # L0 :
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0: addq t2, a0, a0 # E : address of end-of-count
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stb zero, 1(a0) # L :
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nop # E :
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ret # L0 :
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$zerocount:
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nop # E :
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nop # E :
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nop # E :
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ret # L0 :
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END(strncat)
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