[PATCH] D149134: [LICM] Don't try to constant fold instructions

[Nikita Popov via Phabricator via llvm-commits]

nikic added a comment.

In D149134#4295312 <https://reviews.llvm.org/D149134#4295312>, @mkazantsev wrote:

> Just curious, what makes it so expensive? Is it `SafetyInfo` update?

No, it's the constant folding itself. E.g. even if you have some non-foldable operation will all-constant operands (like a load from global or call with constants) it will still do quite a bit of work, such as recursively folding all the constant operands with datalayout.


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