[PATCH] D35584: [CGP] Fold empty dedicated exit blocks created by loopsimplify.

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

To clarify, the original version of this patch recovered the full 3% regression, but the new version only recovers 0.7%?

Is the actual value of the PHI operand relevant here?  It looks like some of the testcases on r289988 involve constants, which are materialized during isel (and can be substantially more expensive).


https://reviews.llvm.org/D35584