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/*=======================================================================================*/
/* This Sail RISC-V architecture model, comprising all files and */
/* directories except where otherwise noted is subject the BSD */
/* two-clause license in the LICENSE file. */
/* */
/* SPDX-License-Identifier: BSD-2-Clause */
/*=======================================================================================*/
/* ****************************************************************** */
union clause ast = RISCV_XPERM8 : (regidx, regidx, regidx)
mapping clause encdec = RISCV_XPERM8(rs2, rs1, rd) if haveZbkx()
<-> 0b0010100 @ rs2 @ rs1 @ 0b100 @ rd @ 0b0110011 if haveZbkx()
mapping clause assembly = RISCV_XPERM8(rs2, rs1, rd)
<-> "xperm8" ^ spc() ^ reg_name(rd) ^ sep() ^ reg_name(rs1) ^ sep() ^ reg_name(rs2)
function clause execute (RISCV_XPERM8(rs2, rs1, rd)) = {
let rs1_val = X(rs1);
let rs2_val = X(rs2);
result : xlenbits = zeros();
foreach (i from 0 to (sizeof(xlen) - 8) by 8) {
let index = unsigned(rs2_val[i+7..i]);
result[i+7..i] = if 8*index < sizeof(xlen)
then rs1_val[8*index+7..8*index]
else zeros()
};
X(rd) = result;
RETIRE_SUCCESS
}
/* ****************************************************************** */
union clause ast = RISCV_XPERM4 : (regidx, regidx, regidx)
mapping clause encdec = RISCV_XPERM4(rs2, rs1, rd) if haveZbkx()
<-> 0b0010100 @ rs2 @ rs1 @ 0b010 @ rd @ 0b0110011 if haveZbkx()
mapping clause assembly = RISCV_XPERM4(rs2, rs1, rd)
<-> "xperm4" ^ spc() ^ reg_name(rd) ^ sep() ^ reg_name(rs1) ^ sep() ^ reg_name(rs2)
function clause execute (RISCV_XPERM4(rs2, rs1, rd)) = {
let rs1_val = X(rs1);
let rs2_val = X(rs2);
result : xlenbits = zeros();
foreach (i from 0 to (sizeof(xlen) - 4) by 4) {
let index = unsigned(rs2_val[i+3..i]);
result[i+3..i] = if 4*index < sizeof(xlen)
then rs1_val[4*index+3..4*index]
else zeros()
};
X(rd) = result;
RETIRE_SUCCESS
}
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