0496389680
- add xperm4 and xperm8 instructions Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn> Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Acked-by: Alistair Francis <alistair.francis@wdc.com> Message-Id: <20220423023510.30794-5-liweiwei@iscas.ac.cn> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
132 lines
3.6 KiB
C
132 lines
3.6 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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static inline target_ulong do_swap(target_ulong x, uint64_t mask, int shift)
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{
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return ((x & mask) << shift) | ((x & ~mask) >> shift);
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}
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target_ulong HELPER(brev8)(target_ulong rs1)
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{
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target_ulong x = rs1;
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x = do_swap(x, 0x5555555555555555ull, 1);
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x = do_swap(x, 0x3333333333333333ull, 2);
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x = do_swap(x, 0x0f0f0f0f0f0f0f0full, 4);
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return x;
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}
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static const uint64_t shuf_masks[] = {
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dup_const(MO_8, 0x44),
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dup_const(MO_8, 0x30),
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dup_const(MO_16, 0x0f00),
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dup_const(MO_32, 0xff0000)
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};
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static inline target_ulong do_shuf_stage(target_ulong src, uint64_t maskL,
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uint64_t maskR, int shift)
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{
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target_ulong x = src & ~(maskL | maskR);
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x |= ((src << shift) & maskL) | ((src >> shift) & maskR);
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return x;
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}
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target_ulong HELPER(unzip)(target_ulong rs1)
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{
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target_ulong x = rs1;
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x = do_shuf_stage(x, shuf_masks[0], shuf_masks[0] >> 1, 1);
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x = do_shuf_stage(x, shuf_masks[1], shuf_masks[1] >> 2, 2);
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x = do_shuf_stage(x, shuf_masks[2], shuf_masks[2] >> 4, 4);
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x = do_shuf_stage(x, shuf_masks[3], shuf_masks[3] >> 8, 8);
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return x;
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}
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target_ulong HELPER(zip)(target_ulong rs1)
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{
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target_ulong x = rs1;
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x = do_shuf_stage(x, shuf_masks[3], shuf_masks[3] >> 8, 8);
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x = do_shuf_stage(x, shuf_masks[2], shuf_masks[2] >> 4, 4);
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x = do_shuf_stage(x, shuf_masks[1], shuf_masks[1] >> 2, 2);
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x = do_shuf_stage(x, shuf_masks[0], shuf_masks[0] >> 1, 1);
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return x;
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}
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static inline target_ulong do_xperm(target_ulong rs1, target_ulong rs2,
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uint32_t sz_log2)
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{
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target_ulong r = 0;
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target_ulong sz = 1LL << sz_log2;
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target_ulong mask = (1LL << sz) - 1;
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target_ulong pos;
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for (int i = 0; i < TARGET_LONG_BITS; i += sz) {
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pos = ((rs2 >> i) & mask) << sz_log2;
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if (pos < sizeof(target_ulong) * 8) {
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r |= ((rs1 >> pos) & mask) << i;
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}
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}
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return r;
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}
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target_ulong HELPER(xperm4)(target_ulong rs1, target_ulong rs2)
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{
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return do_xperm(rs1, rs2, 2);
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}
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target_ulong HELPER(xperm8)(target_ulong rs1, target_ulong rs2)
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{
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return do_xperm(rs1, rs2, 3);
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}
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