------- Comment #8 from pinskia at gcc dot gnu dot org 2010-05-10 22:49 ------- >Anyway, the result of much benchmarking shows that:
Is it? It definitely moves from the x87 registers to the SSE registers which can be slow. Micro benchmarks are not always true benchmarks. Also there are otherways of benchmarking something like isnan. Make a big array of random numbers (who's seed is based on the wall clock) and then test it that way. Save the seed somewhere you read it into the program if you want consistent numbers. Add the number isnan returns non zero and that should give you a good benchmark. Better than what you have below. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44053
