1dnl x86 mpn_copyd -- copy limb vector, decrementing. 2 3dnl Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc. 4dnl 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 8dnl modify it under the terms of the GNU Lesser General Public License as 9dnl published by the Free Software Foundation; either version 3 of the 10dnl License, or (at your option) any later version. 11dnl 12dnl The GNU MP Library is distributed in the hope that it will be useful, 13dnl but WITHOUT ANY WARRANTY; without even the implied warranty of 14dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15dnl Lesser General Public License for more details. 16dnl 17dnl You should have received a copy of the GNU Lesser General Public License 18dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. 19 20include(`../config.m4') 21 22 23C cycles/limb startup (approx) 24C P5: 1.0 40 25C P6 2.4 70 26C K6 1.0 55 27C K7: 1.3 75 28C P4: 2.6 175 29C 30C (Startup time includes some function call overheads.) 31 32 33C void mpn_copyd (mp_ptr dst, mp_srcptr src, mp_size_t size); 34C 35C Copy src,size to dst,size, working from high to low addresses. 36C 37C The code here is very generic and can be expected to be reasonable on all 38C the x86 family. 39 40defframe(PARAM_SIZE,12) 41defframe(PARAM_SRC, 8) 42defframe(PARAM_DST, 4) 43deflit(`FRAME',0) 44 45 TEXT 46 ALIGN(32) 47 48PROLOGUE(mpn_copyd) 49 C eax saved esi 50 C ebx 51 C ecx counter 52 C edx saved edi 53 C esi src 54 C edi dst 55 C ebp 56 57 movl PARAM_SIZE, %ecx 58 movl %esi, %eax 59 60 movl PARAM_SRC, %esi 61 movl %edi, %edx 62 63 movl PARAM_DST, %edi 64 leal -4(%esi,%ecx,4), %esi 65 66 leal -4(%edi,%ecx,4), %edi 67 68 std 69 70 rep 71 movsl 72 73 cld 74 75 movl %eax, %esi 76 movl %edx, %edi 77 78 ret 79 80EPILOGUE() 81