then on the forums, people are saying that sse=387 is bad to use
As far as I'm aware the register allocator in gcc isn't smart enough to handle -mfpmath=sse,387 effectively yet (even in the forth-coming gcc 4.0). It causes sse variables to be stored in 387 registers and vice-versa, which can actually slow things down. However, this is just coming off the top of my head so if you have a particularly FP intensive app which you think may benefit from this flag: benchmark it.
Alastair Murray.
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