diff options
| -rw-r--r-- | lib/CodeGen/BranchFolding.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp index 9ca0091..1138146 100644 --- a/lib/CodeGen/BranchFolding.cpp +++ b/lib/CodeGen/BranchFolding.cpp @@ -30,6 +30,7 @@ using namespace llvm; static Statistic<> NumDeadBlocks("branchfold", "Number of dead blocks removed"); static Statistic<> NumBranchOpts("branchfold", "Number of branches optimized"); static Statistic<> NumTailMerge ("branchfold", "Number of block tails merged"); +static cl::opt<bool> EnableTailMerge("enable-tail-merge", cl::Hidden); namespace { struct BranchFolder : public MachineFunctionPass { @@ -258,7 +259,7 @@ void BranchFolder::ReplaceTailWithBranchTo(MachineBasicBlock::iterator OldInst, bool BranchFolder::TailMergeBlocks(MachineFunction &MF) { MadeChange = false; - return false; + if (!EnableTailMerge) return false; // Find blocks with no successors. std::vector<std::pair<unsigned,MachineBasicBlock*> > MergePotentials; |