copyd.asm
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上传日期:2022-08-06
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- dnl x86 mpn_copyd -- copy limb vector, decrementing.
- dnl Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
- dnl
- dnl This file is part of the GNU MP Library.
- dnl
- dnl The GNU MP Library is free software; you can redistribute it and/or
- dnl modify it under the terms of the GNU Lesser General Public License as
- dnl published by the Free Software Foundation; either version 3 of the
- dnl License, or (at your option) any later version.
- dnl
- dnl The GNU MP Library is distributed in the hope that it will be useful,
- dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
- dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- dnl Lesser General Public License for more details.
- dnl
- dnl You should have received a copy of the GNU Lesser General Public License
- dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
- include(`../config.m4')
- C cycles/limb startup (approx)
- C P5: 1.0 40
- C P6 2.4 70
- C K6 1.0 55
- C K7: 1.3 75
- C P4: 2.6 175
- C
- C (Startup time includes some function call overheads.)
- C void mpn_copyd (mp_ptr dst, mp_srcptr src, mp_size_t size);
- C
- C Copy src,size to dst,size, working from high to low addresses.
- C
- C The code here is very generic and can be expected to be reasonable on all
- C the x86 family.
- defframe(PARAM_SIZE,12)
- defframe(PARAM_SRC, 8)
- defframe(PARAM_DST, 4)
- deflit(`FRAME',0)
- TEXT
- ALIGN(32)
- PROLOGUE(mpn_copyd)
- C eax saved esi
- C ebx
- C ecx counter
- C edx saved edi
- C esi src
- C edi dst
- C ebp
- movl PARAM_SIZE, %ecx
- movl %esi, %eax
- movl PARAM_SRC, %esi
- movl %edi, %edx
- movl PARAM_DST, %edi
- leal -4(%esi,%ecx,4), %esi
- leal -4(%edi,%ecx,4), %edi
- std
- rep
- movsl
- cld
- movl %eax, %esi
- movl %edx, %edi
- ret
- EPILOGUE()