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-rw-r--r--sysdeps/alpha/stpncpy.S107
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diff --git a/sysdeps/alpha/stpncpy.S b/sysdeps/alpha/stpncpy.S
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-/* Copyright (C) 1996, 2002 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Richard Henderson (rth@tamu.edu)
-
- 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. */
-
-/* Copy no more than COUNT bytes of the null-terminated string from
- SRC to DST. If SRC does not cover all of COUNT, the balance is
- zeroed. Return the address of the terminating null in DEST, if
- any, else DEST + COUNT. */
-
-#include <sysdep.h>
-
- .set noat
- .set noreorder
-
- .text
-
-ENTRY(__stpncpy)
- ldgp gp, 0(pv)
-#ifdef PROF
- lda AT, _mcount
- jsr AT, (AT), _mcount
-#endif
- .prologue 1
-
- beq a2, $zerocount
- jsr t9, __stxncpy # do the work of the copy
-
- and t8, 0xf0, t3 # binary search for byte offset of the
- and t8, 0xcc, t2 # last byte written.
- and t8, 0xaa, t1
- andnot a0, 7, v0
- cmovne t3, 4, t3
- cmovne t2, 2, t2
- cmovne t1, 1, t1
- addq v0, t3, v0
- addq t1, t2, t1
- addq v0, t1, v0
-
- bne a2, $multiword # do we have full words left?
-
- .align 3
- zapnot t0, t8, t4 # e0 : was last byte a null?
- subq t8, 1, t2 # .. e1 :
- addq v0, 1, t5 # e0 :
- subq t10, 1, t3 # .. e1 :
- or t2, t8, t2 # e0 : clear the bits between the last
- or t3, t10, t3 # .. e1 : written byte and the last byte in
- andnot t3, t2, t3 # e0 : COUNT
- cmovne t4, t5, v0 # .. e1 : if last written wasnt null, inc v0
- zap t0, t3, t0 # e0 :
- stq_u t0, 0(a0) # e1 :
- ret # .. e1 :
-
- .align 3
-$multiword:
- subq t8, 1, t7 # e0 : clear the final bits in the prev
- or t7, t8, t7 # e1 : word
- zapnot t0, t7, t0 # e0 :
- subq a2, 1, a2 # .. e1 :
- stq_u t0, 0(a0) # e0 :
- addq a0, 8, a0 # .. e1 :
-
- beq a2, 1f # e1 :
- blbc a2, 0f # e1 :
-
- stq_u zero, 0(a0) # e0 : zero one word
- subq a2, 1, a2 # .. e1 :
- addq a0, 8, a0 # e0 :
- beq a2, 1f # .. e1 :
-
-0: stq_u zero, 0(a0) # e0 : zero two words
- subq a2, 2, a2 # .. e1 :
- stq_u zero, 8(a0) # e0 :
- addq a0, 16, a0 # .. e1 :
- bne a2, 0b # e1 :
- unop
-
-1: ldq_u t0, 0(a0) # e0 : clear the leading bits in the final
- subq t10, 1, t7 # .. e1 : word
- or t7, t10, t7 # e0 :
- zap t0, t7, t0 # e1 (stall)
- stq_u t0, 0(a0) # e0 :
- ret # .. e1 :
-
-$zerocount:
- mov a0, v0
- ret
-
- END(__stpncpy)
-
-libc_hidden_def (__stpncpy)
-weak_alias (__stpncpy, stpncpy)