[LLVMdev] folding x * 0 = 0

[David Greene]

On Wednesday 03 March 2010 15:38:06 Chris Lattner wrote:

> > Signalling NaN is one case.  I'm sure there are others.
>
> The only other thing I could imagine that it is useful for is for rounding
> mode control. 

Yep.

> IMO rounding mode should be explicitly marked on the
> instruction as well.

That would also be useful for some GPUs where each instruction can specify
its own rounding mode.

                                                -Dave