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-/* Copyright (C) 2000, 2002 Free Software Foundation, Inc.
- Contributed by Richard Henderson (rth@redhat.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, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-/* Copy no more then N bytes from SRC to DEST, returning the address of
- the terminating '\0' in DEST. */
-
-#include <sysdep.h>
-
- .arch ev6
- .set noat
- .set noreorder
- .text
-
-ENTRY(__stpncpy)
- ldgp gp, 0(pv)
-#ifdef PROF
- lda AT, _mcount
- jsr AT, (AT), _mcount
-#endif
- .prologue 1
-
- mov a0, v0
- beq a2, $zerocount
-
- .align 4
- nop
- nop
- jsr t9, __stxncpy # do the work of the copy
-
- cttz t8, t4
- zapnot t0, t8, t5
- andnot a0, 7, a0
- bne a2, $multiword # do we have full words left?
-
- subq t8, 1, t2
- subq t10, 1, t3
- cmpult zero, t5, t5
- addq a0, t4, v0
-
- or t2, t8, t2
- or t3, t10, t3
- addq v0, t5, v0
- andnot t3, t2, t3
-
- zap t0, t3, t0
- nop
- stq t0, 0(a0)
- ret
-
-$multiword:
- subq t8, 1, t7 # clear the final bits in the prev word
- cmpult zero, t5, t5
- or t7, t8, t7
- zapnot t0, t7, t0
-
- subq a2, 1, a2
- stq t0, 0(a0)
- addq a0, 8, a1
- beq a2, 1f # loop over full words remaining
-
- nop
- nop
- nop
- blbc a2, 0f
-
- stq zero, 0(a1)
- subq a2, 1, a2
- addq a1, 8, a1
- beq a2, 1f
-
-0: stq zero, 0(a1)
- subq a2, 2, a2
- nop
- nop
-
- stq zero, 8(a1)
- addq a1, 16, a1
- nop
- bne a2, 0b
-
-1: ldq t0, 0(a1) # clear the leading bits in the final word
- subq t10, 1, t7
- addq a0, t4, v0
- nop
-
- or t7, t10, t7
- addq v0, t5, v0
- zap t0, t7, t0
- stq t0, 0(a1)
-
-$zerocount:
- nop
- nop
- nop
- ret
-
- END(__stpncpy)
-
-libc_hidden_def (__stpncpy)
-weak_alias (__stpncpy, stpncpy)