1 dnl AMD K7 mpn_copyd -- copy limb vector, decrementing.
3 dnl Copyright 1999, 2000, 2002 Free Software Foundation, Inc.
5 dnl This file is part of the GNU MP Library.
7 dnl The GNU MP Library is free software; you can redistribute it and/or
8 dnl modify it under the terms of the GNU Lesser General Public License as
9 dnl published by the Free Software Foundation; either version 3 of the
10 dnl License, or (at your option) any later version.
12 dnl The GNU MP Library is distributed in the hope that it will be useful,
13 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
14 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 dnl Lesser General Public License for more details.
17 dnl You should have received a copy of the GNU Lesser General Public License
18 dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
20 include(`../config.m4')
23 C alignment dst/src, A=0mod8 N=4mod8
25 C K7 0.75 1.0 1.0 0.75
28 C void mpn_copyd (mp_ptr dst, mp_srcptr src, mp_size_t size);
30 C The various comments in mpn/x86/k7/copyi.asm apply here too.
32 defframe(PARAM_SIZE,12)
33 defframe(PARAM_SRC, 8)
34 defframe(PARAM_DST, 4)
37 dnl parameter space reused
38 define(SAVE_EBX,`PARAM_SIZE')
39 define(SAVE_ESI,`PARAM_SRC')
41 dnl minimum 5 since the unrolled code can't handle less than 5
42 deflit(UNROLL_THRESHOLD, 5)
54 cmpl $UNROLL_THRESHOLD, %ecx
66 C this loop is 2 cycles/limb
68 movl -4(%eax,%ecx,4), %ebx
69 movl %ebx, -4(%edx,%ecx,4)
80 leal (%eax,%ecx,4), %ebx
81 leal (%edx,%ecx,4), %esi
85 subl $4, %ecx C size-4
87 testl $4, %ebx C testl to pad code closer to 16 bytes for L(top)
90 C both src and dst unaligned, process one limb to align them
91 movl 12(%eax,%ecx,4), %ebx
92 movl %ebx, 12(%edx,%ecx,4)
104 movq 8(%eax,%ecx,4), %mm0
105 movq (%eax,%ecx,4), %mm1
107 movq %mm0, 16+8(%edx,%ecx,4)
108 movq %mm1, 16(%edx,%ecx,4)
112 C now %ecx is -4 to -1 representing respectively 0 to 3 limbs remaining
117 movq 8(%eax,%ecx,4), %mm0
118 movq %mm0, 8(%edx,%ecx,4)