From 465c8252f282fda26db6962a81948afce7f01cc2 Mon Sep 17 00:00:00 2001 From: Bob Wilson Date: Tue, 17 Nov 2009 17:40:31 +0000 Subject: [PATCH] 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 --- lib/CodeGen/BranchFolding.cpp | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) 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 &&