clmulh
Carry-less multiply (high-part)
Decode Variables
Bits<5> rs2 = $encoding[24:20];
Bits<5> rs1 = $encoding[19:15];
Bits<5> rd = $encoding[11:7];Execution
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IDL
-
Sail
if (implemented?(ExtensionName::B) && (misa.B == 1'b0)) {
raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
XReg rs1_val = X[rs1];
XReg rs2_val = X[rs2];
XReg output = 0;
for (U32 i = 1; i <= xlen(); i++) {
output = (rs2_val : output;
}
X[rd] = output;{
let rs1_val = X(rs1);
let rs2_val = X(rs2);
result : xlenbits = zeros();
foreach (i from 0 to (xlen_val - 1))
if rs2_val[i] == bitone then result = result ^ (rs1_val >> (xlen_val - i));
X(rd) = result;
RETIRE_SUCCESS
}