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author | Kyle Butt <kyle+llvm@iteratee.net> | 2016-08-26 20:12:40 +0000 |
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committer | Kyle Butt <kyle+llvm@iteratee.net> | 2016-08-26 20:12:40 +0000 |
commit | 723aa1327c653847158b39c87180ffb149b2b351 (patch) | |
tree | cf14f22acce99d2dc694bf27b573733c84b36bf6 /llvm/lib/CodeGen/TailDuplicator.cpp | |
parent | c527a49b98848424b39cdc8ee70375d68a3ec760 (diff) | |
download | llvm-723aa1327c653847158b39c87180ffb149b2b351.zip llvm-723aa1327c653847158b39c87180ffb149b2b351.tar.gz llvm-723aa1327c653847158b39c87180ffb149b2b351.tar.bz2 |
TailDuplication: Record blocks that received the duplicated block. NFC.
This will allow tail duplication during layout to handle the cfg changes more
cleanly.
llvm-svn: 279858
Diffstat (limited to 'llvm/lib/CodeGen/TailDuplicator.cpp')
-rw-r--r-- | llvm/lib/CodeGen/TailDuplicator.cpp | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/TailDuplicator.cpp b/llvm/lib/CodeGen/TailDuplicator.cpp index bf3379e..a27e38d 100644 --- a/llvm/lib/CodeGen/TailDuplicator.cpp +++ b/llvm/lib/CodeGen/TailDuplicator.cpp @@ -119,8 +119,13 @@ static void VerifyPHIs(MachineFunction &MF, bool CheckExtra) { } /// Tail duplicate the block and cleanup. -bool TailDuplicator::tailDuplicateAndUpdate(bool IsSimple, - MachineBasicBlock *MBB) { +/// \p IsSimple - return value of isSimpleBB +/// \p MBB - block to be duplicated +/// \p DuplicatedPreds - if non-null, \p DuplicatedPreds will contain a list of +/// all Preds that received a copy of \p MBB. +bool TailDuplicator::tailDuplicateAndUpdate( + bool IsSimple, MachineBasicBlock *MBB, + SmallVectorImpl<MachineBasicBlock*> *DuplicatedPreds) { // Save the successors list. SmallSetVector<MachineBasicBlock *, 8> Succs(MBB->succ_begin(), MBB->succ_end()); @@ -216,6 +221,9 @@ bool TailDuplicator::tailDuplicateAndUpdate(bool IsSimple, if (NewPHIs.size()) NumAddedPHIs += NewPHIs.size(); + if (DuplicatedPreds) + *DuplicatedPreds = std::move(TDBBs); + return true; } |