use wider datatype to minimize overflow
use wider datatype to minimize overflow

possibility for measurement computations

cruppstahl/simdcomp,NaveenSigmoid/simdcomp,lemire/simdcomp,cruppstahl/simdcomp,NaveenSigmoid/simdcomp,lemire/simdcomp,cruppstahl/simdcomp,NaveenSigmoid/simdcomp,lemire/simdcomp