3 files changed, 29 insertions, 9 deletions

diff --git a/llvm/lib/CodeGen/BranchFolding.cpp b/llvm/lib/CodeGen/BranchFolding.cpp
index c4c060fba2e..1094f52efbb 100644
--- a/llvm/lib/CodeGen/BranchFolding.cpp
+++ b/llvm/lib/CodeGen/BranchFolding.cpp
@@ -99,8 +99,9 @@ bool BranchFolderPass::runOnMachineFunction(MachineFunction &MF) {
   // HW that requires structurized CFG.
   bool EnableTailMerge = !MF.getTarget().requiresStructuredCFG() &&
                          PassConfig->getEnableTailMerge();
-  BranchFolder Folder(EnableTailMerge, /*CommonHoist=*/true,
-                      getAnalysis<MachineBlockFrequencyInfo>(),
+  BranchFolder::MBFIWrapper MBBFreqInfo(
+      getAnalysis<MachineBlockFrequencyInfo>());
+  BranchFolder Folder(EnableTailMerge, /*CommonHoist=*/true, MBBFreqInfo,
                       getAnalysis<MachineBranchProbabilityInfo>());
   return Folder.OptimizeFunction(MF, MF.getSubtarget().getInstrInfo(),
                                  MF.getSubtarget().getRegisterInfo(),
@@ -108,7 +109,7 @@ bool BranchFolderPass::runOnMachineFunction(MachineFunction &MF) {
 }
 
 BranchFolder::BranchFolder(bool defaultEnableTailMerge, bool CommonHoist,
-                           const MachineBlockFrequencyInfo &FreqInfo,
+                           MBFIWrapper &FreqInfo,
                            const MachineBranchProbabilityInfo &ProbInfo)
     : EnableHoistCommonCode(CommonHoist), MBBFreqInfo(FreqInfo),
       MBPI(ProbInfo) {
@@ -540,6 +541,18 @@ void BranchFolder::MBFIWrapper::setBlockFreq(const MachineBasicBlock *MBB,
   MergedBBFreq[MBB] = F;
 }
 
+raw_ostream &
+BranchFolder::MBFIWrapper::printBlockFreq(raw_ostream &OS,
+                                          const MachineBasicBlock *MBB) const {
+  return MBFI.printBlockFreq(OS, getBlockFreq(MBB));
+}
+
+raw_ostream &
+BranchFolder::MBFIWrapper::printBlockFreq(raw_ostream &OS,
+                                          const BlockFrequency Freq) const {
+  return MBFI.printBlockFreq(OS, Freq);
+}
+
 /// CountTerminators - Count the number of terminators in the given
 /// block and set I to the position of the first non-terminator, if there
 /// is one, or MBB->end() otherwise.
diff --git a/llvm/lib/CodeGen/BranchFolding.h b/llvm/lib/CodeGen/BranchFolding.h
index d759d53e27f..156641e351b 100644
--- a/llvm/lib/CodeGen/BranchFolding.h
+++ b/llvm/lib/CodeGen/BranchFolding.h
@@ -26,8 +26,10 @@ namespace llvm {
 
   class LLVM_LIBRARY_VISIBILITY BranchFolder {
   public:
+    class MBFIWrapper;
+
     explicit BranchFolder(bool defaultEnableTailMerge, bool CommonHoist,
-                          const MachineBlockFrequencyInfo &MBFI,
+                          MBFIWrapper &MBFI,
                           const MachineBranchProbabilityInfo &MBPI);
 
     bool OptimizeFunction(MachineFunction &MF,
@@ -98,6 +100,7 @@ namespace llvm {
     MachineModuleInfo *MMI;
     RegScavenger *RS;
 
+  public:
     /// \brief This class keeps track of branch frequencies of newly created
     /// blocks and tail-merged blocks.
     class MBFIWrapper {
@@ -105,13 +108,18 @@ namespace llvm {
       MBFIWrapper(const MachineBlockFrequencyInfo &I) : MBFI(I) {}
       BlockFrequency getBlockFreq(const MachineBasicBlock *MBB) const;
       void setBlockFreq(const MachineBasicBlock *MBB, BlockFrequency F);
+      raw_ostream &printBlockFreq(raw_ostream &OS,
+                                  const MachineBasicBlock *MBB) const;
+      raw_ostream &printBlockFreq(raw_ostream &OS,
+                                  const BlockFrequency Freq) const;
 
     private:
       const MachineBlockFrequencyInfo &MBFI;
       DenseMap<const MachineBasicBlock *, BlockFrequency> MergedBBFreq;
     };
 
-    MBFIWrapper MBBFreqInfo;
+  private:
+    MBFIWrapper &MBBFreqInfo;
     const MachineBranchProbabilityInfo &MBPI;
 
     bool TailMergeBlocks(MachineFunction &MF);
diff --git a/llvm/lib/CodeGen/IfConversion.cpp b/llvm/lib/CodeGen/IfConversion.cpp
index c2586b5bf8c..5fd18ed2fe2 100644
--- a/llvm/lib/CodeGen/IfConversion.cpp
+++ b/llvm/lib/CodeGen/IfConversion.cpp
@@ -163,7 +163,6 @@ namespace {
     const TargetLoweringBase *TLI;
     const TargetInstrInfo *TII;
     const TargetRegisterInfo *TRI;
-    const MachineBlockFrequencyInfo *MBFI;
     const MachineBranchProbabilityInfo *MBPI;
     MachineRegisterInfo *MRI;
 
@@ -291,7 +290,7 @@ bool IfConverter::runOnMachineFunction(MachineFunction &MF) {
   TLI = ST.getTargetLowering();
   TII = ST.getInstrInfo();
   TRI = ST.getRegisterInfo();
-  MBFI = &getAnalysis<MachineBlockFrequencyInfo>();
+  BranchFolder::MBFIWrapper MBFI(getAnalysis<MachineBlockFrequencyInfo>());
   MBPI = &getAnalysis<MachineBranchProbabilityInfo>();
   MRI = &MF.getRegInfo();
   SchedModel.init(ST.getSchedModel(), &ST, TII);
@@ -303,7 +302,7 @@ bool IfConverter::runOnMachineFunction(MachineFunction &MF) {
   bool BFChange = false;
   if (!PreRegAlloc) {
     // Tail merge tend to expose more if-conversion opportunities.
-    BranchFolder BF(true, false, *MBFI, *MBPI);
+    BranchFolder BF(true, false, MBFI, *MBPI);
     BFChange = BF.OptimizeFunction(MF, TII, ST.getRegisterInfo(),
                                    getAnalysisIfAvailable<MachineModuleInfo>());
   }
@@ -427,7 +426,7 @@ bool IfConverter::runOnMachineFunction(MachineFunction &MF) {
   BBAnalysis.clear();
 
   if (MadeChange && IfCvtBranchFold) {
-    BranchFolder BF(false, false, *MBFI, *MBPI);
+    BranchFolder BF(false, false, MBFI, *MBPI);
     BF.OptimizeFunction(MF, TII, MF.getSubtarget().getRegisterInfo(),
                         getAnalysisIfAvailable<MachineModuleInfo>());
   }