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Diffstat (limited to 'lib/CodeGen/MachineBlockPlacement.cpp')
| -rw-r--r-- | lib/CodeGen/MachineBlockPlacement.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/CodeGen/MachineBlockPlacement.cpp b/lib/CodeGen/MachineBlockPlacement.cpp index 3eb2998116..ec0877fc05 100644 --- a/lib/CodeGen/MachineBlockPlacement.cpp +++ b/lib/CodeGen/MachineBlockPlacement.cpp @@ -275,6 +275,12 @@ static std::string getBlockNum(MachineBasicBlock *BB) { } #endif +/// \brief Mark a chain's successors as having one fewer preds. +/// +/// When a chain is being merged into the "placed" chain, this routine will +/// quickly walk the successors of each block in the chain and mark them as +/// having one fewer active predecessor. It also adds any successors of this +/// chain which reach the zero-predecessor state to the worklist passed in. void MachineBlockPlacement::markChainSuccessors( BlockChain &Chain, MachineBasicBlock *LoopHeaderBB, |