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enable branch folding with an option

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31335 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-11-01 00:38:31 +00:00
parent 0db427bb2d
commit d8ccff0c3e
1 changed files with 2 additions and 1 deletions

3
lib/CodeGen/BranchFolding.cpp

@ -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;