diff options
Diffstat (limited to 'ports/sysdeps/alpha/alphaev67/strncat.S')
| -rw-r--r-- | ports/sysdeps/alpha/alphaev67/strncat.S | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/ports/sysdeps/alpha/alphaev67/strncat.S b/ports/sysdeps/alpha/alphaev67/strncat.S new file mode 100644 index 0000000000..e354128674 --- /dev/null +++ b/ports/sysdeps/alpha/alphaev67/strncat.S @@ -0,0 +1,87 @@ +/* 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) |