[PATCH] [SROA] Fold a PHI node if all its incoming values are the same

[Jingyue Wu]

ping?

On Tue Jul 29 2014 at 6:24:28 PM Jingyue Wu <jingyue at google.com> wrote:

> Can anyone take a look at the latest diff?
>
> In the latest diff, I use SimplifyInstruction to fold both PHI nodes and
> select instructions. Doing so requires a minor fix in the logic of
> clobbering dead uses in select instructions: to clobber x/y in "select
> undef, x, y", we should change the condition from "undef" to 0/1.
> Otherwise, "select undef, undef, y" or "select undef, x, undef" can
> introduce more undefined behavior. This wasn't an issue in the old code,
> because the old code does not fold a select with undef condition.
>
> http://reviews.llvm.org/D4659
>
>
>
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