clmulr

Carry-less multiply (reversed)

This instruction is defined by:

Encoding

clmulr produces bits 2*XLEN-2:XLEN-1 of the 2*XLEN carry-less product

M	HS	U	VS	VU
Always	Always	Always	Always	Always

Always

Bits<5> xs2 = $encoding[24:20];
Bits<5> xs1 = $encoding[19:15];
Bits<5> xd = $encoding[11:7];

XReg xs1_val = X[xs1];
XReg xs2_val = X[xs2];
XReg output = 0;
for (U32 i = 0; i < 8'64; i++) {
  output = (xs2_val : output;
}
X[xd] = output;

XReg xs1_val = X[xs1];
XReg xs2_val = X[xs2];
XReg output = 0;
for (U32 i = 0; i < xlen(); i++) {
  output = (xs2_val : output;
}
X[xd] = output;