On Thu, Apr 14, 2005 at 05:27:16PM +0200, François-Xavier Coudert wrote: > No, since reading GFORTRAN_FPU_* variables changes the FPU mode when the > library is loaded, while TR 15580 commands will be ran afterwards (during > execution).
You'll find that globally changing the rounding mode will screw up libm functions. Which is pretty much going to make this useless. Further, when folks need rounding modes other than round-to-nearest, they tend to need to switch rounding modes during the program too. For instance, to perform the same calculation with both round-up and round-down to get error bounds on the calculation. Thus I think an environment variable to do this is doubly useless. All that said, C99 has <fenv.h> to control just about anything you could want about the fpu. r~
