The 64-bit compiler also introduces routines which do QUAD precision floating point calculations into existing libraries.
The 64-bit compiler provides a united runtime library for parallel C and parallel Fortran programs (libmp), as opposed to two (libcmp, libmpc) libraries under the 32 code compiler. This united library allows you to mix parallel C with parallel fortran programs.
The 64-bit compiler also does not include libmld.a, but provides libdwarf.a.