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Sun ships a highly tuned math library with its Fortran compiler. This library is link compatible with g77 output, and is reported to improve performance of g77-compiled Fortran programs by roughly 2x when used instead of the system libm. I haven't run any accuracy tests, but the person I've been talking to says that his codes have not lost any accuracy. Would it make sense to patch g77 to detect and optionally use this library? I can do up the patch quite easily if there is interest. zw