[PATCH] Make InstCombine aware of TargetTransformInfo when optimize extension

[Krzysztof Parzyszek]

On 6/26/2015 3:20 AM, Chandler Carruth wrote:
> This doesn't seem like the right approach at all.
>
> I don't think we want to use cost heuristics to dictate the canonical form in the IR. It makes the canonicalization *much* more complex and hard to manage.

Wouldn't it be reasonable to have a pass of instcombine that performs 
canonicalization and another pass of it that is target-aware?

-Krzysztof


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