[PATCH] Reassociate: optimize I1 + x - I2 into x when I1 and I2 are identical

[Chandler Carruth]

LGTM. I feel like we might want to be doing something more systematic to
ensure that identical sub-expressions are correctly modeled throughout the
reassociate pass, but this seems like an obvious strict improvement. =]

On Thu, Oct 2, 2014 at 9:15 AM, Dmitri Shtilman <dshtilman at icloud.com>
wrote:

> Please review.
>
> On Sep 24, 2014, at 3:49 PM, Dmitri Shtilman <dshtilman at icloud.com> wrote:
>
> > Hi all,
> >
> > The following small patch gives the Reassociate pass a bit more
> flexibility and autonomy when optimizing expressions.
> > Particularly, it addresses cases where Reassociate breaks Subtracts but
> then fails to optimize combinations like I1 + -I2 where I1 and I2 have the
> same rank and are identical.
> >
> > Please review.
> > Dmitri
> >
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