[PATCH] D30632: [LoopUnrolling] Fix loop size check for peeling

[Max Kazantsev via Phabricator via llvm-commits]

mkazantsev updated this revision to Diff 90784.

https://reviews.llvm.org/D30632

Files:
  lib/Transforms/Utils/LoopUnrollPeel.cpp


Index: lib/Transforms/Utils/LoopUnrollPeel.cpp
===================================================================
--- lib/Transforms/Utils/LoopUnrollPeel.cpp
+++ lib/Transforms/Utils/LoopUnrollPeel.cpp
@@ -75,7 +75,9 @@
   // its only back edge. If there is such Phi, peeling 1 iteration from the
   // loop is profitable, because starting from 2nd iteration we will have an
   // invariant instead of this Phi.
-  if (auto *BackEdge = L->getLoopLatch()) {
+  if (LoopSize <= UP.Threshold) {
+    BasicBlock *BackEdge = L->getLoopLatch();
+    assert(BackEdge && "Loop is not in simplified form?");
     BasicBlock *Header = L->getHeader();
     // Iterate over Phis to find one with invariant input on back edge.
     bool FoundCandidate = false;


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