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enable branch folding with an option

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llvm-svn: 31335
This commit is contained in:
Chris Lattner 2006-11-01 00:38:31 +00:00
parent a585562f95
commit 5651528580
1 changed files with 2 additions and 1 deletions
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3
lib/CodeGen/BranchFolding.cpp
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@ -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;