91 lines
2.3 KiB
C
91 lines
2.3 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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*
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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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static const uint64_t adjacent_masks[] = {
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dup_const(MO_8, 0x55),
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dup_const(MO_8, 0x33),
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dup_const(MO_8, 0x0f),
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dup_const(MO_16, 0xff),
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dup_const(MO_32, 0xffff),
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UINT32_MAX
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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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static target_ulong do_grev(target_ulong rs1,
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target_ulong rs2,
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int bits)
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{
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target_ulong x = rs1;
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int i, shift;
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for (i = 0, shift = 1; shift < bits; i++, shift <<= 1) {
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if (rs2 & shift) {
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x = do_swap(x, adjacent_masks[i], shift);
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}
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}
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return x;
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}
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target_ulong HELPER(grev)(target_ulong rs1, target_ulong rs2)
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{
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return do_grev(rs1, rs2, TARGET_LONG_BITS);
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}
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target_ulong HELPER(grevw)(target_ulong rs1, target_ulong rs2)
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{
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return do_grev(rs1, rs2, 32);
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}
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static target_ulong do_gorc(target_ulong rs1,
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target_ulong rs2,
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int bits)
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{
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target_ulong x = rs1;
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int i, shift;
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for (i = 0, shift = 1; shift < bits; i++, shift <<= 1) {
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if (rs2 & shift) {
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x |= do_swap(x, adjacent_masks[i], shift);
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}
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}
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return x;
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}
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target_ulong HELPER(gorc)(target_ulong rs1, target_ulong rs2)
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{
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return do_gorc(rs1, rs2, TARGET_LONG_BITS);
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}
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target_ulong HELPER(gorcw)(target_ulong rs1, target_ulong rs2)
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{
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return do_gorc(rs1, rs2, 32);
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}
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