diff options
Diffstat (limited to 'sysdeps/alpha/alphaev67/strncat.S')
| -rw-r--r-- | sysdeps/alpha/alphaev67/strncat.S | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/sysdeps/alpha/alphaev67/strncat.S b/sysdeps/alpha/alphaev67/strncat.S new file mode 100644 index 0000000000..4d199d95fe --- /dev/null +++ b/sysdeps/alpha/alphaev67/strncat.S @@ -0,0 +1,101 @@ +/* Copyright (C) 2000 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +/* 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 $16, $0 # set up return value + beq $18, $zerocount # U : + /* Find the end of the string. */ + ldq_u $1, 0($16) # L : load first quadword ($16 may be misaligned) + lda $2, -1($31) # E : + + insqh $2, $0, $2 # U : + andnot $16, 7, $16 # E : + nop # E : + or $2, $1, $1 # E : + + nop # E : + nop # E : + cmpbge $31, $1, $2 # E : bits set iff byte == 0 + bne $2, $found # U : + +$loop: ldq $1, 8($16) # L : + addq $16, 8, $16 # E : + cmpbge $31, $1, $2 # E : + beq $2, $loop # U : + +$found: cttz $2, $3 # U0 : + addq $16, $3, $16 # E : + jsr $23, __stxncpy # L0 :/* Now do the append. */ + + /* Worry about the null termination. */ + + zapnot $1, $27, $2 # U : was last byte a null? + cmplt $27, $24, $5 # E : did we fill the buffer completely? + bne $2, 0f # U : + ret # L0 : + +0: or $5, $18, $2 # E : + nop + bne $2, 2f # U : + and $24, 0x80, $3 # E : no zero next byte + + nop # E : + bne $3, 1f # U : + /* Here there are bytes left in the current word. Clear one. */ + addq $24, $24, $24 # E : end-of-count bit <<= 1 + nop # E : + +2: zap $1, $24, $1 # U : + nop # E : + stq_u $1, 0($16) # L : + ret # L0 : + +1: /* Here we must clear the first byte of the next DST word */ + stb $31, 8($16) # L : + nop # E : + nop # E : + ret # L0 : + +$zerocount: + nop # E : + nop # E : + nop # E : + ret # L0 : + + END(strncat) |