[PATCH] D31558: CodeGen: BranchFolding: Merge identical blocks, even if they are short.

[David Li via Phabricator via llvm-commits]

davidxl added inline comments.


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Comment at: lib/CodeGen/BranchFolding.cpp:604
+  // If both blocks are identical, merge them.
+  if (I1 == MBB1->begin() && I2 == MBB2->begin())
+    return true;
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This may have bad effect on block layout if tail dup can recover from it. For instance, when both MBB1 and MBB2 have fall through successors. 


Repository:
  rL LLVM

https://reviews.llvm.org/D31558