Should -msse3 enable fisttp?

[Evan Cheng]

Hi Uros,

Since you are the one who enabled fisttp, I figure I should send this  
email to you directly.

Let me know what you think. I kind of agree with your argument. But  
for practical reasons I thinkg -msse3 should enable fisttp. Certainly  
here in Apple, a few folks have been surprised by this.

Thanks,

Evan
Senior Compiler Engineer
Apple Computers

On Sep 29, 2005, at 1:48 PM, Evan Cheng wrote:

> 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
>