[PATCH] D138412: [IndVarSimplify] Lift limitations on IV being a Phi for turn-to-invariant

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

In D138412#3941331 <https://reviews.llvm.org/D138412#3941331>, @reames wrote:

> LGTM
>
> I do want to warn that this may be a subtler perf tradeoff than it looks.  I'm fine with landing this, but be alert for perf regressions and be prepared to investigate and revert if needed.  Despite that, I think this is generally the right idea.

ACK, all such expansions are dormant performance regressions.


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https://reviews.llvm.org/D138412