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/*
* RISC-V Bitmanip Extension Helpers for QEMU.
*
* Copyright (c) 2020 Kito Cheng, kito.cheng@sifive.com
* Copyright (c) 2020 Frank Chang, frank.chang@sifive.com
* Copyright (c) 2021 Philipp Tomsich, philipp.tomsich@vrull.eu
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/host-utils.h"
#include "exec/exec-all.h"
#include "exec/helper-proto.h"
#include "tcg/tcg.h"
target_ulong HELPER(clmul)(target_ulong rs1, target_ulong rs2)
{
target_ulong result = 0;
for (int i = 0; i < TARGET_LONG_BITS; i++) {
if ((rs2 >> i) & 1) {
result ^= (rs1 << i);
}
}
return result;
}
target_ulong HELPER(clmulr)(target_ulong rs1, target_ulong rs2)
{
target_ulong result = 0;
for (int i = 0; i < TARGET_LONG_BITS; i++) {
if ((rs2 >> i) & 1) {
result ^= (rs1 >> (TARGET_LONG_BITS - i - 1));
}
}
return result;
}
static inline target_ulong do_swap(target_ulong x, uint64_t mask, int shift)
{
return ((x & mask) << shift) | ((x & ~mask) >> shift);
}
target_ulong HELPER(brev8)(target_ulong rs1)
{
target_ulong x = rs1;
x = do_swap(x, 0x5555555555555555ull, 1);
x = do_swap(x, 0x3333333333333333ull, 2);
x = do_swap(x, 0x0f0f0f0f0f0f0f0full, 4);
return x;
}
static const uint64_t shuf_masks[] = {
dup_const(MO_8, 0x44),
dup_const(MO_8, 0x30),
dup_const(MO_16, 0x0f00),
dup_const(MO_32, 0xff0000)
};
static inline target_ulong do_shuf_stage(target_ulong src, uint64_t maskL,
uint64_t maskR, int shift)
{
target_ulong x = src & ~(maskL | maskR);
x |= ((src << shift) & maskL) | ((src >> shift) & maskR);
return x;
}
target_ulong HELPER(unzip)(target_ulong rs1)
{
target_ulong x = rs1;
x = do_shuf_stage(x, shuf_masks[0], shuf_masks[0] >> 1, 1);
x = do_shuf_stage(x, shuf_masks[1], shuf_masks[1] >> 2, 2);
x = do_shuf_stage(x, shuf_masks[2], shuf_masks[2] >> 4, 4);
x = do_shuf_stage(x, shuf_masks[3], shuf_masks[3] >> 8, 8);
return x;
}
target_ulong HELPER(zip)(target_ulong rs1)
{
target_ulong x = rs1;
x = do_shuf_stage(x, shuf_masks[3], shuf_masks[3] >> 8, 8);
x = do_shuf_stage(x, shuf_masks[2], shuf_masks[2] >> 4, 4);
x = do_shuf_stage(x, shuf_masks[1], shuf_masks[1] >> 2, 2);
x = do_shuf_stage(x, shuf_masks[0], shuf_masks[0] >> 1, 1);
return x;
}
static inline target_ulong do_xperm(target_ulong rs1, target_ulong rs2,
uint32_t sz_log2)
{
target_ulong r = 0;
target_ulong sz = 1LL << sz_log2;
target_ulong mask = (1LL << sz) - 1;
target_ulong pos;
for (int i = 0; i < TARGET_LONG_BITS; i += sz) {
pos = ((rs2 >> i) & mask) << sz_log2;
if (pos < sizeof(target_ulong) * 8) {
r |= ((rs1 >> pos) & mask) << i;
}
}
return r;
}
target_ulong HELPER(xperm4)(target_ulong rs1, target_ulong rs2)
{
return do_xperm(rs1, rs2, 2);
}
target_ulong HELPER(xperm8)(target_ulong rs1, target_ulong rs2)
{
return do_xperm(rs1, rs2, 3);
}
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