[LLVMdev] Cannot Select ConstantFP on x86

[Evan Cheng]

On Sep 24, 2008, at 5:11 PM, David Greene wrote:

> I just ran into this today with x86-64:
>
> Cannot yet select: 0x3cbc180: f64 = ConstantFP <1>
>
> As far as I can tell, DAGCombiner comes along and sees an sint_to_fp  
> of the
> constant 1 and hapilly folds it into a ConstantFP<1>.  ISel then  
> blows up
> because there's no pattern for it.

Sounds like a bug if dag combiner is doing this after legalization.  
DAG combiner should never form anything that's illegal after  
legalization has completed.

Evan

>
>
> Does this look familiar to anyone?  I don't see any relevant bugs in  
> the
> database.
>
>                                           -Dave
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