[PATCH] D39236: [SCEV][NFC] Introduce isSafeToExpandAt function to SCEVExpander

[Max Kazantsev via Phabricator via llvm-commits]

mkazantsev created this revision.

This function checks that:

1. It is safe to expand a SCEV;
2. It is OK to materialize it at the specified location.

For example, attempt to expand a loop's AddRec to the same loop's preheader should fail.


https://reviews.llvm.org/D39236

Files:
  include/llvm/Analysis/ScalarEvolutionExpander.h
  lib/Analysis/ScalarEvolutionExpander.cpp
  unittests/Analysis/ScalarEvolutionTest.cpp

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