##madd_execute
bits(datasize) operand1 = X[n];
bits(datasize) operand2 = X[m];
bits(destsize) operand3 = X[a];

integer result;

if sub_op then
    result = UInt(operand3) - (UInt(operand1) * UInt(operand2));
else
    result = UInt(operand3) + (UInt(operand1) * UInt(operand2));
end

X[d] = result<destsize-1:0>;
@@