Setting the FPU control word?

[Bill Baxter]

Neil Vice wrote:
> "Bill Baxter" <dnewsgroup at billbaxter.com> wrote in message 
> news:fr3k2f$30b5$1 at digitalmars.com...
>> Anyone know how to translate these instructions to D? (specifically 
>> DMD/Win flavor of D, but GDC/Win also appreciated if different):
>>
>>    http://www.cs.cmu.edu/~quake/robust.pc.html
>>
>> --bb
> 
> Something along the following lines seems to do the trick, by which I mean 
> it compiles in 2.012 though I believe the syntax should be compatible with 
> D1:
> 
> enum FPPrecision : short
> {
>     Single = 4210,
>     Double = 4722
> }
> 
> void setFPCtrlWord(FPPrecision precision)
> {
>     asm
>     {
>         fldcw precision;
>     }
> }

Ooh, thanks!

> Having said that it might be advisable to use 'fstcw' and bitwise operations 
> to alter the specifics of the control-word that you require:
> 
> http://www.website.masmforum.com/tutorials/fptute/fpuchap3.htm#fldcw 

Hmm, yeh.  Those crazy computational geometry guys always assume you're 
writing a command line program whose only purpose in life is to 
calculate a Delaunay triangulation or something.  Oh, you want to use 
this algorithm in a what?? an application??  What's that?

True to form, that page from Shewchuk says nothing about how to put 
things back the way you found them when you're done with robust 
predicate happy-fun-time.

That page you linked to was great though.  Thanks.

--bb