1dnl x86 mpn_copyd -- copy limb vector, decrementing. 2 3dnl Copyright 1999-2002 Free Software Foundation, Inc. 4 5dnl This file is part of the GNU MP Library. 6dnl 7dnl The GNU MP Library is free software; you can redistribute it and/or modify 8dnl it under the terms of either: 9dnl 10dnl * the GNU Lesser General Public License as published by the Free 11dnl Software Foundation; either version 3 of the License, or (at your 12dnl option) any later version. 13dnl 14dnl or 15dnl 16dnl * the GNU General Public License as published by the Free Software 17dnl Foundation; either version 2 of the License, or (at your option) any 18dnl later version. 19dnl 20dnl or both in parallel, as here. 21dnl 22dnl The GNU MP Library is distributed in the hope that it will be useful, but 23dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 24dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 25dnl for more details. 26dnl 27dnl You should have received copies of the GNU General Public License and the 28dnl GNU Lesser General Public License along with the GNU MP Library. If not, 29dnl see https://www.gnu.org/licenses/. 30 31include(`../config.m4') 32 33 34C cycles/limb startup (approx) 35C P5 1.0 40 36C P6 2.4 70 37C K6 1.0 55 38C K7 1.3 75 39C P4 2.6 175 40C 41C (Startup time includes some function call overheads.) 42 43 44C void mpn_copyd (mp_ptr dst, mp_srcptr src, mp_size_t size); 45C 46C Copy src,size to dst,size, working from high to low addresses. 47C 48C The code here is very generic and can be expected to be reasonable on all 49C the x86 family. 50 51defframe(PARAM_SIZE,12) 52defframe(PARAM_SRC, 8) 53defframe(PARAM_DST, 4) 54deflit(`FRAME',0) 55 56 TEXT 57 ALIGN(32) 58 59PROLOGUE(mpn_copyd) 60 C eax saved esi 61 C ebx 62 C ecx counter 63 C edx saved edi 64 C esi src 65 C edi dst 66 C ebp 67 68 movl PARAM_SIZE, %ecx 69 movl %esi, %eax 70 71 movl PARAM_SRC, %esi 72 movl %edi, %edx 73 74 movl PARAM_DST, %edi 75 leal -4(%esi,%ecx,4), %esi 76 77 leal -4(%edi,%ecx,4), %edi 78 79 std 80 81 rep 82 movsl 83 84 cld 85 86 movl %eax, %esi 87 movl %edx, %edi 88 89 ret 90 91EPILOGUE() 92