[PATCH] D123408: [InstCombine] Limit folding of cast into PHI

[Thorsten via Phabricator via llvm-commits]

tschuett added a comment.

Deoptimize in instcombine in favour of the LV sounds like an anti-pattern. Do you deoptimize in favour of PGO?

Maybe have a instcombine.rst: We optimize anything we can. There are some limits here. We delegate some optimizations to FOO. We never deoptimize in favour of other passes.


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  https://reviews.llvm.org/D123408/new/

https://reviews.llvm.org/D123408