[PATCH, i386]: Rewrite x87 sqrt patterns

[Michael Matz]

Hi,

On Wed, 22 Nov 2006, Andrew Haley wrote:

> Uros Bizjak writes:
> 
>  > The i386 sqrt patterns doesn't truncate the result of fsqrt x87 
>  > instruction. 
> 
> And neither do add, sub. mult, or div.  What's special about sqrt that
> it deserves this treatement?

Right.  If you _really_ want to fix x87 you'll have to explicitely 
truncate every intermediate result, just like -ffloat-store.  I guess 
nobody wants that, so why do it for sqrt?


Ciao,
Michael.