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
diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp
index e0a7825..af5fbd1 100644
--- a/lib/CodeGen/BranchFolding.cpp
+++ b/lib/CodeGen/BranchFolding.cpp
@@ -42,6 +42,7 @@
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 @@
// If it is dead, remove it.
if (MBB->pred_empty()) {
+ NumInstrDups -= MBB->size();
RemoveDeadBlock(MBB);
MadeChange = true;
++NumDeadBlocks;
@@ -1100,6 +1102,7 @@
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());