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. 6 7dnl The GNU MP Library is free software; you can redistribute it and/or modify 8dnl it under the terms of the GNU Lesser General Public License as published 9dnl by the Free Software Foundation; either version 3 of the License, or (at 10dnl your option) any later version. 11 12dnl The GNU MP Library is distributed in the hope that it will be useful, but 13dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 14dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 15dnl License for more details. 16 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 20 21include(`../config.m4') 22 23C cycles/limb 24C z900 0.75 25C z990 0.375 26C z9 ? 27C z10 ? 28C z196 ? 29 30C NOTE 31C * This is based on GNU libc memcpy which was written by Martin Schwidefsky. 32 33C INPUT PARAMETERS 34define(`rp', `%r2') 35define(`up', `%r3') 36define(`n', `%r4') 37 38ASM_START() 39PROLOGUE(mpn_copyi) 40 ltr %r4, %r4 41 sll %r4, 2 42 je L(rtn) 43 ahi %r4, -1 44 lr %r5, %r4 45 srl %r5, 8 46 ltr %r5, %r5 C < 256 bytes to copy? 47 je L(1) 48 49L(top): mvc 0(256, rp), 0(up) 50 la rp, 256(rp) 51 la up, 256(up) 52 brct %r5, L(top) 53 54L(1): bras %r5, L(2) C make r5 point to mvc insn 55 mvc 0(1, rp), 0(up) 56L(2): ex %r4, 0(%r5) C execute mvc with length ((n-1) mod 256)+1 57L(rtn): br %r14 58EPILOGUE() 59