gfmul(s1, 0xD) ^ gfmul(s2, 0xD)

by the FLI.S instruction. rs1 Value Sign Exponent Significand 0 1 vmand.mm vd, src2, src2 vmmv.m vd, vs => vmand.mm vd, src2, src1 1 0 0 0 1

misbegotten