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a1095bdcb0
The 1.0.0 version of Zbb does not contain grev/grevi. Instead, a rev8 instruction (equivalent to the rev8 pseudo-instruction built on grevi from pre-0.93 draft-B) is available. This commit adds the new rev8 instruction and removes grev/grevi. Note that there is no W-form of this instruction (both a sign-extending and zero-extending 32-bit version can easily be synthesized by following rev8 with either a srai or srli instruction on RV64) and that the opcode encodings for rev8 in RV32 and RV64 are different. Signed-off-by: Philipp Tomsich <philipp.tomsich@vrull.eu> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20210911140016.834071-14-philipp.tomsich@vrull.eu Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/*
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* RISC-V Bitmanip Extension Helpers for QEMU.
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*
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* Copyright (c) 2020 Kito Cheng, kito.cheng@sifive.com
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* Copyright (c) 2020 Frank Chang, frank.chang@sifive.com
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* Copyright (c) 2021 Philipp Tomsich, philipp.tomsich@vrull.eu
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2 or later, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qemu/host-utils.h"
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#include "exec/exec-all.h"
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#include "exec/helper-proto.h"
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#include "tcg/tcg.h"
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target_ulong HELPER(clmul)(target_ulong rs1, target_ulong rs2)
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{
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target_ulong result = 0;
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for (int i = 0; i < TARGET_LONG_BITS; i++) {
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if ((rs2 >> i) & 1) {
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result ^= (rs1 << i);
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}
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}
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return result;
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}
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target_ulong HELPER(clmulr)(target_ulong rs1, target_ulong rs2)
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{
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target_ulong result = 0;
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for (int i = 0; i < TARGET_LONG_BITS; i++) {
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if ((rs2 >> i) & 1) {
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result ^= (rs1 >> (TARGET_LONG_BITS - i - 1));
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}
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}
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return result;
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}
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