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| author | Bob Wilson <bob.wilson@apple.com> | 2009-11-18 22:12:31 +0000 |
|---|---|---|
| committer | Bob Wilson <bob.wilson@apple.com> | 2009-11-18 22:12:31 +0000 |
| commit | 79d621035ebe620261dd8139a0882f62edabbfdb (patch) | |
| tree | 93a05ea6d7cc779191f507245c8550144bf9dc68 /lib/CodeGen/BranchFolding.cpp | |
| parent | f605773869d1489dcfb10c47f99ada9fe4908b45 (diff) | |
| download | llvm-79d621035ebe620261dd8139a0882f62edabbfdb.tar.gz llvm-79d621035ebe620261dd8139a0882f62edabbfdb.tar.bz2 llvm-79d621035ebe620261dd8139a0882f62edabbfdb.tar.xz | |
Add another statistic to measure code size due to tail duplication.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89254 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/BranchFolding.cpp')
| -rw-r--r-- | lib/CodeGen/BranchFolding.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp index e0a7825a26..af5fbd1202 100644 --- a/lib/CodeGen/BranchFolding.cpp +++ b/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()); |