[PATCH] D47767: [SCEV] Drop cached info after late nsw/nuw flags setting

[Sanjoy Das via Phabricator via llvm-commits]

sanjoy added a comment.

Can you please also add a SCEV-only test case?



================
Comment at: lib/Analysis/ScalarEvolution.cpp:1634
         auto NewFlags = proveNoWrapViaConstantRanges(AR);
         const_cast<SCEVAddRecExpr *>(AR)->setNoWrapFlags(NewFlags);
+        forgetMemoizedResults(AR);
----------------
Let's pull out a `setNoWrapFlagsOnAddRec` helper that does the right thing and has a comment explaining what's going on and what the alternatives are.


https://reviews.llvm.org/D47767