>>>>> "MB" == Miles Bader <miles@xxxxxxx> writes: >> But in my experience, -mfpmath=sse will slow my code very much. MB> Hmm, I've always found SSE FP to be a speedup -- sometimes a _big_ MB> speedup -- over 387 FP, at least when one is using mostly primitive MB> FP operations (mul, divide, sqrt, etc) ... I think it's worth MB> testing, at least. Many years ago, when I asked about using -fpmath=sse on an ia32 box, the advice was that, because the function args and return values had to be passed on the 387 stack, most code would be much slower. Some of the new chips seem to have specific optimizations to deal with code which constantly moves values between registers and the stack, so it is probably less of an issue on newer chips than it used to be. But if one is using a newer chip, why not upgrade to -m64, too? -JimC -- James Cloos <cloos@xxxxxxxxxxx> OpenPGP: 1024D/ED7DAEA6
