Alpha ev67 strncat implementation.

diff --git a/sysdeps/alpha/alphaev67/strncat.S b/sysdeps/alpha/alphaev67/strncat.S
new file mode 100644 (file)
index 0000000..4d199d9
--- /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)