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| author | Bob Wilson <bob.wilson@apple.com> | 2009-11-17 17:40:31 +0000 |
|---|---|---|
| committer | Bob Wilson <bob.wilson@apple.com> | 2009-11-17 17:40:31 +0000 |
| commit | c9622b2ee6ee8bf9057d5d17bc4b6dc70d8fa874 (patch) | |
| tree | 24bb2b41be91fe08c85bb66ccd0fef28a9ef2bd7 /lib/CodeGen/BranchFolding.cpp | |
| parent | 3f6474095adef9b9dc65ef94b481785caa086ea7 (diff) | |
| download | external_llvm-c9622b2ee6ee8bf9057d5d17bc4b6dc70d8fa874.zip external_llvm-c9622b2ee6ee8bf9057d5d17bc4b6dc70d8fa874.tar.gz external_llvm-c9622b2ee6ee8bf9057d5d17bc4b6dc70d8fa874.tar.bz2 | |
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
Diffstat (limited to 'lib/CodeGen/BranchFolding.cpp')
| -rw-r--r-- | lib/CodeGen/BranchFolding.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp index 1a2117b..9ed8051 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 && |