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| author | Chris Lattner <sabre@nondot.org> | 2006-11-01 00:38:31 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-11-01 00:38:31 +0000 |
| commit | d8ccff0c3e5028019a02dd44bf7d906efc9effd8 (patch) | |
| tree | ce34b531c9f45f3473078265666b1eae8bee6482 | |
| parent | 0db427bb2d06950750faac4dc0440493dca5ff78 (diff) | |
| download | external_llvm-d8ccff0c3e5028019a02dd44bf7d906efc9effd8.zip external_llvm-d8ccff0c3e5028019a02dd44bf7d906efc9effd8.tar.gz external_llvm-d8ccff0c3e5028019a02dd44bf7d906efc9effd8.tar.bz2 | |
enable branch folding with an option
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31335 91177308-0d34-0410-b5e6-96231b3b80d8
| -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; |