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

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folding optimizations.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89109 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson 2009-11-17 17:40:31 +00:00
parent a9ea9ec194
commit 465c8252f2
1 changed files with 2 additions and 2 deletions
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lib/CodeGen/BranchFolding.cpp
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@ -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 &&