[PATCH] [InstructionMerge - GVN] hoisting and sinking of equivalent memory instructions in diamonds

[Chandler Carruth]

On Fri, May 2, 2014 at 3:20 PM, Gerolf Hoflehner <ghoflehner at apple.com>wrote:

> I look at GVN as the place that handles equivalent computations (full and
> partial, since it also covers at least some PRE).
> On the other hand the current implementation of the InstructionMerge is
> independent of the GVN infrastructure and
> so could run as stand-alone pass with its merits and costs.
>

I would start off with it being an independent pass until it need some
infrastructure from GVN. It also makes it much easier to review and test.
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