maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

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

llvm-svn: 89254
This commit is contained in:
Bob Wilson 2009-11-18 22:12:31 +00:00
parent c85e9c563a
commit 5d87f7d5f8
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
llvm/lib/CodeGen/BranchFolding.cpp
View File

@ -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());