[LLVMdev] X + 0.0

[Chris Lattner]

On Jul 26, 2010, at 3:22 PM, Dale Johannesen wrote:
On Jul 26, 2010, at 2:52 PMPDT, Jochen Wilhelmy wrote:
>>> Currently we don't do any unsafe-math opts in InstCombine.  Not  
>>> sure if this is policy or if it's just that nobody's implemented it.
>>> 
>> perhaps in can be implemented using the existing flag -enable-unsafe- 
>> fp-math.
>> what do you think?
> 
> I don't see any good reason these opts shouldn't be in InstCombine.   
> Last time I looked that flag wasn't easily accessible in InstCombine  
> but it looks like that might have been fixed.

Keeping it out of the mid-level optimizers is "by design".  When we tackle this, we should do it right, by making the flags per-instruction.

-Chris