[llvm-dev] Folding zext from i1 into PHI nodes with only zwo incoming values.

[Daniel Berlin via llvm-dev]

On Mon, Jan 30, 2017 at 1:22 PM, Sanjay Patel <spatel at rotateright.com>
wrote:

> Hi Björn and Daniel,
>
> FoldPHIArgOpIntoPHI() is for unary ops (casts), but it calls
> FoldPHIArgBinOpIntoPHI() for binops which takes care of almost everything
> else?
>

FWIW: It seems like it tries to restrict itself to certain cases (single
use) but i can still pretty easily produce a testcase where it would
require an exponential number of applications.

That said, hasn't triggered so far for folks, so \_(ツ)_/¯
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