search for: _pc_64

...So, what I did to try to fix the problem (to my knowledge, Microsoft will not support compile time switching of floating point control until version 8.0 of their compiler - see: http://blogs.msdn.com/ericflee) was to place the following statement inside R_init_mylib: _controlfp(_MCW_PC, _PC_64); // use extended precision for operations in x87 FPU This didn't fix my problem. I ended up sprinkling these liberally throughout my code, but that didn't help. One thing I do like about the Microsoft compiler is the debugging facility. But, I'll definitely switch to gcc if this...