1dnl S/390-32 mpn_copyi 2 3dnl Copyright 2011 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 31 32include(`../config.m4') 33 34C cycles/limb 35C z900 0.75 36C z990 0.375 37C z9 ? 38C z10 ? 39C z196 ? 40 41C NOTE 42C * This is based on GNU libc memcpy which was written by Martin Schwidefsky. 43 44C INPUT PARAMETERS 45define(`rp', `%r2') 46define(`up', `%r3') 47define(`n', `%r4') 48 49ASM_START() 50PROLOGUE(mpn_copyi) 51 ltr %r4, %r4 52 sll %r4, 2 53 je L(rtn) 54 ahi %r4, -1 55 lr %r5, %r4 56 srl %r5, 8 57 ltr %r5, %r5 C < 256 bytes to copy? 58 je L(1) 59 60L(top): mvc 0(256, rp), 0(up) 61 la rp, 256(rp) 62 la up, 256(up) 63 brct %r5, L(top) 64 65L(1): bras %r5, L(2) C make r5 point to mvc insn 66 mvc 0(1, rp), 0(up) 67L(2): ex %r4, 0(%r5) C execute mvc with length ((n-1) mod 256)+1 68L(rtn): br %r14 69EPILOGUE() 70