From: Bob Wilson <bob.wilson@apple.com>
Date: Tue, 17 Nov 2009 17:40:31 +0000 (+0000)
Subject: Update a comment, now that tail duplication happens after other branch
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=465c8252f282fda26db6962a81948afce7f01cc2;p=oota-llvm.git

Update a comment, now that tail duplication happens after other branch
folding optimizations.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89109 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp
index 1a2117b9123..9ed805174b4 100644
--- a/lib/CodeGen/BranchFolding.cpp
+++ b/lib/CodeGen/BranchFolding.cpp
@@ -1230,8 +1230,8 @@ ReoptimizeBlock:
     // If the previous block unconditionally falls through to this block and
     // this block has no other predecessors, move the contents of this block
     // into the prior block. This doesn't usually happen when SimplifyCFG
-    // has been used, but it can happen if tail duplication eliminates all the
-    // non-branch predecessors of a block leaving only the fall-through edge.
+    // has been used, but it can happen if tail merging splits a fall-through
+    // predecessor of a block.
     // This has to check PrevBB->succ_size() because EH edges are ignored by
     // AnalyzeBranch.
     if (PriorCond.empty() && !PriorTBB && MBB->pred_size() == 1 &&