[PATCH] D22320: Codegen: Tail Duplication: Only duplicate into layout pred if it is a CFG Pred.

[Kyle Butt via llvm-commits]

iteratee removed rL LLVM as the repository for this revision.
iteratee updated this revision to Diff 63876.
iteratee added a comment.

Add a comment above the check.


http://reviews.llvm.org/D22320

Files:
  lib/CodeGen/TailDuplicator.cpp

Index: lib/CodeGen/TailDuplicator.cpp
===================================================================
--- lib/CodeGen/TailDuplicator.cpp
+++ lib/CodeGen/TailDuplicator.cpp
@@ -814,6 +814,8 @@
   // This has to check PrevBB->succ_size() because EH edges are ignored by
   // AnalyzeBranch.
   if (PrevBB->succ_size() == 1 &&
+      // Layout preds are not always CFG preds. Check.
+      *PrevBB->succ_begin() == TailBB &&
       !TII->AnalyzeBranch(*PrevBB, PriorTBB, PriorFBB, PriorCond, true) &&
       PriorCond.empty() && !PriorTBB && TailBB->pred_size() == 1 &&
       !TailBB->hasAddressTaken()) {


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