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-rw-r--r--sysdeps/alpha/strncat.S95
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diff --git a/sysdeps/alpha/strncat.S b/sysdeps/alpha/strncat.S
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-/* Copyright (C) 1996 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Richard Henderson <rth@tamu.edu>, 1996.
-
- 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, 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>
-
- .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
-
- /* Find the end of the string. */
-
- ldq_u t0, 0(a0) # load first quadword (a0 may be misaligned)
- lda t1, -1(zero)
- insqh t1, a0, t1
- andnot a0, 7, a0
- or t1, t0, t0
- cmpbge zero, t0, t1 # t1 <- bitmask: bit i == 1 <==> i-th byte == 0
- bne t1, $found
-
-$loop: ldq t0, 8(a0)
- addq a0, 8, a0 # addr += 8
- cmpbge zero, t0, t1
- beq t1, $loop
-
-$found: negq t1, t2 # clear all but least set bit
- and t1, t2, t1
-
- and t1, 0xf0, t2 # binary search for that set bit
- and t1, 0xcc, t3
- and t1, 0xaa, t4
- cmovne t2, 4, t2
- cmovne t3, 2, t3
- cmovne t4, 1, t4
- addq t2, t3, t2
- addq a0, t4, a0
- addq a0, t2, a0
-
- /* Now do the append. */
-
- jsr t9, __stxncpy
-
- /* Worry about the null termination. */
-
- zapnot t0, t8, t1 # was last byte a null?
- bne t1, 0f
- ret
-
-0: and t10, 0x80, t1
- bne t1, 1f
-
- /* Here there are bytes left in the current word. Clear one. */
- addq t10, t10, t10 # end-of-count bit <<= 1
- zap t0, t10, t0
- stq_u t0, 0(a0)
- ret
-
-1: /* Here we must read the next DST word and clear the first byte. */
- ldq_u t0, 8(a0)
- zap t0, 1, t0
- stq_u t0, 8(a0)
-
-$zerocount:
- ret
-
- END(strncat)