ic3[31..24] @ ic2[23..16] @ ic3[15.. 8] @ ic3[ 7.. 0]; let oc2 : bits(32) = ic1[31..24] @ ic2[23..16] @ ic3[15.. 8] @ ic3[ 7.. 0]; let s1 : bits (8) = (s0) ^ xt2(s1) ^ xt3(s2) ^ (s3); let