Should -msse3 enable fisttp

[Evan Cheng]

Hi,

I know this has been discussed in bug 18668. But I'd like to bring it  
up again.

Currently, fisttp is only generated with -march=prescott. The  
argument is fisttp is not a SSE instruction. While this is  
technically true, it's likely to surprise the users. Intel, after  
all, does lump fisttp in SSE3.  AMD64 architecture programmer's  
manual also explicitly state fisttp is a SSE3 instruction.

Please consider enabling fisttp with -msse3.

Thanks,

Evan