| Austin Schuh | dace2a6 | 2020-08-18 10:56:48 -0700 | [diff] [blame^] | 1 | dnl x86 mpn_copyd -- copy limb vector, decrementing. |
| 2 | |
| 3 | dnl Copyright 1999-2002 Free Software Foundation, Inc. |
| 4 | |
| 5 | dnl This file is part of the GNU MP Library. |
| 6 | dnl |
| 7 | dnl The GNU MP Library is free software; you can redistribute it and/or modify |
| 8 | dnl it under the terms of either: |
| 9 | dnl |
| 10 | dnl * the GNU Lesser General Public License as published by the Free |
| 11 | dnl Software Foundation; either version 3 of the License, or (at your |
| 12 | dnl option) any later version. |
| 13 | dnl |
| 14 | dnl or |
| 15 | dnl |
| 16 | dnl * the GNU General Public License as published by the Free Software |
| 17 | dnl Foundation; either version 2 of the License, or (at your option) any |
| 18 | dnl later version. |
| 19 | dnl |
| 20 | dnl or both in parallel, as here. |
| 21 | dnl |
| 22 | dnl The GNU MP Library is distributed in the hope that it will be useful, but |
| 23 | dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 24 | dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 25 | dnl for more details. |
| 26 | dnl |
| 27 | dnl You should have received copies of the GNU General Public License and the |
| 28 | dnl GNU Lesser General Public License along with the GNU MP Library. If not, |
| 29 | dnl see https://www.gnu.org/licenses/. |
| 30 | |
| 31 | include(`../config.m4') |
| 32 | |
| 33 | |
| 34 | C cycles/limb startup (approx) |
| 35 | C P5 1.0 40 |
| 36 | C P6 2.4 70 |
| 37 | C K6 1.0 55 |
| 38 | C K7 1.3 75 |
| 39 | C P4 2.6 175 |
| 40 | C |
| 41 | C (Startup time includes some function call overheads.) |
| 42 | |
| 43 | |
| 44 | C void mpn_copyd (mp_ptr dst, mp_srcptr src, mp_size_t size); |
| 45 | C |
| 46 | C Copy src,size to dst,size, working from high to low addresses. |
| 47 | C |
| 48 | C The code here is very generic and can be expected to be reasonable on all |
| 49 | C the x86 family. |
| 50 | |
| 51 | defframe(PARAM_SIZE,12) |
| 52 | defframe(PARAM_SRC, 8) |
| 53 | defframe(PARAM_DST, 4) |
| 54 | deflit(`FRAME',0) |
| 55 | |
| 56 | TEXT |
| 57 | ALIGN(32) |
| 58 | |
| 59 | PROLOGUE(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 | |
| 91 | EPILOGUE() |