[PATCH] D73181: [SCEV] Do not use backedge SCEV of PHI if its input is another PHI

[Denis Antrushin via Phabricator via llvm-commits]

dantrushin marked an inline comment as done.
dantrushin added inline comments.


================
Comment at: llvm/lib/Analysis/ScalarEvolution.cpp:8247
+            if (!isa<PHINode>(BackedgeVal) &&
+                IsAvailableOnEntry(LI, DT, OnBackedge, PN->getParent()))
               return OnBackedge;
----------------
Bailing out here when any PHI is seen, because I did not find convinient API to get SCEV at previous iteration.
Is there one?


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D73181/new/

https://reviews.llvm.org/D73181