Dr. Jakob Schiø tz provided important feedback in the optimization process of the present CM-Fortran code. We are grateful to Palle Pedersen of Thinking Machines Corp. for CDPEAC assembler optimization of the CM-Fortran neighbor-list subroutine. The author would like to acknowledge computing facilities at JRCAT Supercomputer System in Tsukuba, Japan, as financially supported by New Energy and Industrial Technology Development Organization (NEDO).