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Enable tail merging by default.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31140 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -30,7 +30,6 @@ using namespace llvm;
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static Statistic<> NumDeadBlocks("branchfold", "Number of dead blocks removed");
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static Statistic<> NumDeadBlocks("branchfold", "Number of dead blocks removed");
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static Statistic<> NumBranchOpts("branchfold", "Number of branches optimized");
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static Statistic<> NumBranchOpts("branchfold", "Number of branches optimized");
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static Statistic<> NumTailMerge ("branchfold", "Number of block tails merged");
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static Statistic<> NumTailMerge ("branchfold", "Number of block tails merged");
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static cl::opt<bool> EnableTailMerge("enable-tail-merge", cl::init(false));
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namespace {
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namespace {
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struct BranchFolder : public MachineFunctionPass {
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struct BranchFolder : public MachineFunctionPass {
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@ -207,9 +206,6 @@ void BranchFolder::ReplaceTailWithBranchTo(MachineBasicBlock::iterator OldInst,
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bool BranchFolder::TailMergeBlocks(MachineFunction &MF) {
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bool BranchFolder::TailMergeBlocks(MachineFunction &MF) {
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MadeChange = false;
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MadeChange = false;
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if (!EnableTailMerge)
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return false;
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// Find blocks with no successors.
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// Find blocks with no successors.
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std::vector<std::pair<unsigned,MachineBasicBlock*> > MergePotentials;
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std::vector<std::pair<unsigned,MachineBasicBlock*> > MergePotentials;
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for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) {
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for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) {
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