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Add another statistic to measure code size due to tail duplication.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89254 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson 2009-11-18 22:12:31 +00:00
parent f605773869
commit 79d621035e
1 changed files with 3 additions and 0 deletions
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3
lib/CodeGen/BranchFolding.cpp
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@ -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());