GCC's -ffast-math behavior

[xunxun]

于 2012/2/10 13:52, Miles Bader 写道:
>
>
> If you switch to using SSE floating-point, e.g. using "-mfpmath=sse",
> it will still call the library functions even when using -ffast-math
> (because the SSE unit doesn't have special instructions like "fsin" or
> "f2xm1").  I think SSE FP is typically faster than the 387 for many
> CPUs anyway.
>
Well, that's right.
But in my experience, -mfpmath=sse will slow my code very much.
I think -mfpmath=sse option has some bugs on X86.


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Best Regards,
xunxun