[PATCH] D65376: Randomly outline code for cold regions

[Vedant Kumar via Phabricator via llvm-commits]

vsk added a comment.

I think that this is probably too risky. I've seen that splitting out the wrong block can introduce major performance regressions (up to and including stack overflow).

As a future direction for code reordering in llvm, a pass that operates on the machine instruction level may have more promise. At that level, there's a reduced/eliminated code size penalty and landingpads can be moved easily. There's less pass ordering flexibility, but experiments seem to show that late splitting works better anyway.


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  https://reviews.llvm.org/D65376/new/

https://reviews.llvm.org/D65376