diff options
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/BranchFolding.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/BranchFolding.cpp b/llvm/lib/CodeGen/BranchFolding.cpp index e0a7825a26c..af5fbd1202a 100644 --- a/llvm/lib/CodeGen/BranchFolding.cpp +++ b/llvm/lib/CodeGen/BranchFolding.cpp @@ -42,6 +42,7 @@ STATISTIC(NumDeadBlocks, "Number of dead blocks removed"); STATISTIC(NumBranchOpts, "Number of branches optimized"); STATISTIC(NumTailMerge , "Number of block tails merged"); STATISTIC(NumTailDups , "Number of tail duplicated blocks"); +STATISTIC(NumInstrDups , "Additional instructions due to tail duplication"); static cl::opt<cl::boolOrDefault> FlagEnableTailMerge("enable-tail-merge", cl::init(cl::BOU_UNSET), cl::Hidden); @@ -1020,6 +1021,7 @@ bool BranchFolder::TailDuplicateBlocks(MachineFunction &MF) { // If it is dead, remove it. if (MBB->pred_empty()) { + NumInstrDups -= MBB->size(); RemoveDeadBlock(MBB); MadeChange = true; ++NumDeadBlocks; @@ -1100,6 +1102,7 @@ bool BranchFolder::TailDuplicate(MachineBasicBlock *TailBB, MachineInstr *NewMI = MF.CloneMachineInstr(I); PredBB->insert(PredBB->end(), NewMI); } + NumInstrDups += TailBB->size() - 1; // subtract one for removed branch // Update the CFG. PredBB->removeSuccessor(PredBB->succ_begin()); |
