1dnl RISC-V/64 mpn_addmul_1 and mpn_submul_1. 2 3dnl Copyright 2016 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 33C INPUT PARAMETERS 34define(`rp', `a0') 35define(`up', `a1') 36define(`n', `a2') 37define(`v0', `a3') 38 39ifdef(`OPERATION_addmul_1',` 40 define(`ADDSUB', `add') 41 define(`CMPCY', `sltu $1, $2, $3') 42 define(`func', `mpn_addmul_1') 43') 44ifdef(`OPERATION_submul_1',` 45 define(`ADDSUB', `sub') 46 define(`CMPCY', `sltu $1, $3, $2') 47 define(`func', `mpn_submul_1') 48') 49 50MULFUNC_PROLOGUE(mpn_addmul_1 mpn_submul_1) 51 52ASM_START() 53PROLOGUE(func) 54 li a6, 0 55 56L(top): ld a7, 0(up) 57 addi up, up, 8 C bookkeeping 58 ld a4, 0(rp) 59 addi rp, rp, 8 C bookkeeping 60 mul a5, a7, v0 61 addi n, n, -1 C bookkeeping 62 mulhu a7, a7, v0 63 ADDSUB a5, a4, a5 64 ADDSUB a6, a5, a6 C cycle 0, 3, ... 65 CMPCY( a4, a5, a4) 66 add a4, a4, a7 67 CMPCY( a5, a6, a5) C cycle 1, 4, ... 68 sd a6, -8(rp) 69 add a6, a4, a5 C cycle 2, 5, ... 70 bne n, x0, L(top) C bookkeeping 71 72L(end): mv a0, a6 73 ret 74EPILOGUE() 75ASM_END() 76