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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 | 724d8a45c16905d8f3cce79a6158a30f638e9038 (patch) | |
| tree | 31676334a5809f108092a9d737a52d62b91911b8 /llvm/lib/CodeGen/BranchFolding.cpp | |
| parent | 14b25eb87be213e0562274e1e3dcefa34d5af6d1 (diff) | |
| download | bcm5719-llvm-724d8a45c16905d8f3cce79a6158a30f638e9038.tar.gz bcm5719-llvm-724d8a45c16905d8f3cce79a6158a30f638e9038.zip | |
Update a comment, now that tail duplication happens after other branch
folding optimizations.
llvm-svn: 89109
Diffstat (limited to 'llvm/lib/CodeGen/BranchFolding.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/BranchFolding.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/BranchFolding.cpp b/llvm/lib/CodeGen/BranchFolding.cpp index 1a2117b9123..9ed805174b4 100644 --- a/llvm/lib/CodeGen/BranchFolding.cpp +++ b/llvm/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 && |
