The purpose of Double precision SIMD-oriented Fast Mersenne Twister (dSFMT)
is to speed up the generation by avoiding the expensive conversion
of integer to double (floating point). dSFMT directly generates
double precision floating point pseudorandom numbers which have the
IEEE Standard for Binary Floating-Point Arithmetic (ANSI/IEEE Std
754-1985) format. dSFMT is only available on the CPUs which use IEEE
754 format double precision floating point numbers.