[llvm] r207301 - [X86] Implement TargetLowering::getScalingFactorCost hook.

[Krzysztof Parzyszek]

On 4/28/2014 11:45 AM, Quentin Colombet wrote:
> For the record, we’ve already proposed a target-specific DAG combine to
> be run before any target independent DAG combine.
> This was rejected at the time:
> http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130128/163692.html

There is a claim there that "this is counter to the design of the DAG 
combiner", and that the design was modeled after instr-combiner, but 
there was no word about why this was made into a design principle.  What 
was the reason behind this attempt at canonicalization?  Does anyone 
remember?

-Krzysztof

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