| dnl x86 mpn_copyd -- copy limb vector, decrementing. |
| |
| dnl Copyright 1999-2002 Free Software Foundation, Inc. |
| |
| 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 modify |
| dnl it under the terms of either: |
| dnl |
| dnl * the GNU Lesser General Public License as published by the Free |
| dnl Software Foundation; either version 3 of the License, or (at your |
| dnl option) any later version. |
| dnl |
| dnl or |
| dnl |
| dnl * the GNU General Public License as published by the Free Software |
| dnl Foundation; either version 2 of the License, or (at your option) any |
| dnl later version. |
| dnl |
| dnl or both in parallel, as here. |
| dnl |
| dnl The GNU MP Library is distributed in the hope that it will be useful, but |
| dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| dnl for more details. |
| dnl |
| dnl You should have received copies of the GNU General Public License and the |
| dnl GNU Lesser General Public License along with the GNU MP Library. If not, |
| dnl see https://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() |