[PATCH] D40597: [SCEV][NFC] Share value cache between SCEVs in GroupByComplexity

[Max Kazantsev via Phabricator via llvm-commits]

mkazantsev created this revision.

Current implementation of `compareSCEVComplexity` is being unreasonable with `SCEVUnknown`s:
every time it sees one, it creates a new value cache and tries to prove equality of two values using it.
This cache reallocates and gets lost from SCEV to SCEV.

This patch changes this behavior: now we create one cache for all values and shares it between SCEVs.


https://reviews.llvm.org/D40597

Files:
  lib/Analysis/ScalarEvolution.cpp

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