1 /* 2 * RISC-V Bitmanip Extension Helpers for QEMU. 3 * 4 * Copyright (c) 2020 Kito Cheng, kito.cheng@sifive.com 5 * Copyright (c) 2020 Frank Chang, frank.chang@sifive.com 6 * Copyright (c) 2021 Philipp Tomsich, philipp.tomsich@vrull.eu 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms and conditions of the GNU General Public License, 10 * version 2 or later, as published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 * 17 * You should have received a copy of the GNU General Public License along with 18 * this program. If not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include "qemu/osdep.h" 22 #include "qemu/host-utils.h" 23 #include "exec/exec-all.h" 24 #include "exec/helper-proto.h" 25 #include "tcg/tcg.h" 26 27 target_ulong HELPER(clmul)(target_ulong rs1, target_ulong rs2) 28 { 29 target_ulong result = 0; 30 31 for (int i = 0; i < TARGET_LONG_BITS; i++) { 32 if ((rs2 >> i) & 1) { 33 result ^= (rs1 << i); 34 } 35 } 36 37 return result; 38 } 39 40 target_ulong HELPER(clmulr)(target_ulong rs1, target_ulong rs2) 41 { 42 target_ulong result = 0; 43 44 for (int i = 0; i < TARGET_LONG_BITS; i++) { 45 if ((rs2 >> i) & 1) { 46 result ^= (rs1 >> (TARGET_LONG_BITS - i - 1)); 47 } 48 } 49 50 return result; 51 } 52