[LLVMdev] ComputeMaskedBits Bug

[Nick Lewycky]

David Greene wrote:
> Is my analysis correct?  If so, is the PHI code the culprit (for not returning
> the min of the KnownZero bits) or is the Shl code the culprit (for not paying
> attention to the Mask passed in (it right shifts it)?

I think your analysis is correct, and that Shl -- and many of the other 
operations (AShr, LShr, SExt, Add?, Call?) -- should be modified to 
always respect Mask.

Nick