64 bit F7

[Chris Jones]

> -mfpmath=sse : This one tells the compiler to use the SSE capabilities 
> of your chip for mathematical stuff. This options can make a different 
> to *any* code that uses maths.. Its this that makes the 20% difference 
> to my 32 bit cuilds. (you have to also include any one of -msse, -msse2 
> or -msse3 at the same time).

For more details, try a 'man gcc' and search for the section on -mfpmath.

Chris