Add some constantness to BranchProbabilityInfo and BlockFrequnencyInfo.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146986 91177308-0d34-0410-b5e6-96231b3b80d8

5 files changed, 20 insertions, 9 deletions

diff --git a/lib/CodeGen/MachineBasicBlock.cpp b/lib/CodeGen/MachineBasicBlock.cpp
index 673491608d..b4a2ca1894 100644
--- a/lib/CodeGen/MachineBasicBlock.cpp
+++ b/lib/CodeGen/MachineBasicBlock.cpp
@@ -870,11 +870,11 @@ MachineBasicBlock::findDebugLoc(instr_iterator MBBI) {
 
 /// getSuccWeight - Return weight of the edge from this block to MBB.
 ///
-uint32_t MachineBasicBlock::getSuccWeight(MachineBasicBlock *succ) {
+uint32_t MachineBasicBlock::getSuccWeight(const MachineBasicBlock *succ) const {
   if (Weights.empty())
     return 0;
 
-  succ_iterator I = std::find(Successors.begin(), Successors.end(), succ);
+  const_succ_iterator I = std::find(Successors.begin(), Successors.end(), succ);
   return *getWeightIterator(I);
 }
 
@@ -888,6 +888,16 @@ getWeightIterator(MachineBasicBlock::succ_iterator I) {
   return Weights.begin() + index;
 }
 
+/// getWeightIterator - Return wight iterator corresonding to the I successor
+/// iterator
+MachineBasicBlock::const_weight_iterator MachineBasicBlock::
+getWeightIterator(MachineBasicBlock::const_succ_iterator I) const {
+  assert(Weights.size() == Successors.size() && "Async weight list!");
+  const size_t index = std::distance(Successors.begin(), I);
+  assert(index < Weights.size() && "Not a current successor!");
+  return Weights.begin() + index;
+}
+
 void llvm::WriteAsOperand(raw_ostream &OS, const MachineBasicBlock *MBB,
                           bool t) {
   OS << "BB#" << MBB->getNumber();
diff --git a/lib/CodeGen/MachineBlockFrequencyInfo.cpp b/lib/CodeGen/MachineBlockFrequencyInfo.cpp
index b92cda9614..a079d6e591 100644
--- a/lib/CodeGen/MachineBlockFrequencyInfo.cpp
+++ b/lib/CodeGen/MachineBlockFrequencyInfo.cpp
@@ -56,6 +56,6 @@ bool MachineBlockFrequencyInfo::runOnMachineFunction(MachineFunction &F) {
 /// the other block frequencies. We do this to avoid using of floating points.
 ///
 BlockFrequency MachineBlockFrequencyInfo::
-getBlockFreq(MachineBasicBlock *MBB) const {
+getBlockFreq(const MachineBasicBlock *MBB) const {
   return MBFI->getBlockFreq(MBB);
 }
diff --git a/lib/CodeGen/MachineBranchProbabilityInfo.cpp b/lib/CodeGen/MachineBranchProbabilityInfo.cpp
index dc45e46bb6..0cc1af0795 100644
--- a/lib/CodeGen/MachineBranchProbabilityInfo.cpp
+++ b/lib/CodeGen/MachineBranchProbabilityInfo.cpp
@@ -29,7 +29,7 @@ char MachineBranchProbabilityInfo::ID = 0;
 void MachineBranchProbabilityInfo::anchor() { }
 
 uint32_t MachineBranchProbabilityInfo::
-getSumForBlock(MachineBasicBlock *MBB, uint32_t &Scale) const {
+getSumForBlock(const MachineBasicBlock *MBB, uint32_t &Scale) const {
   // First we compute the sum with 64-bits of precision, ensuring that cannot
   // overflow by bounding the number of weights considered. Hopefully no one
   // actually needs 2^32 successors.
@@ -61,8 +61,8 @@ getSumForBlock(MachineBasicBlock *MBB, uint32_t &Scale) const {
 }
 
 uint32_t
-MachineBranchProbabilityInfo::getEdgeWeight(MachineBasicBlock *Src,
-                                            MachineBasicBlock *Dst) const {
+MachineBranchProbabilityInfo::getEdgeWeight(const MachineBasicBlock *Src,
+                                            const MachineBasicBlock *Dst) const {
   uint32_t Weight = Src->getSuccWeight(Dst);
   if (!Weight)
     return DEFAULT_WEIGHT;
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 68c9514990..42d97685e5 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -1287,8 +1287,8 @@ bool SelectionDAGBuilder::isExportableFromCurrentBlock(const Value *V,
 }
 
 /// Return branch probability calculated by BranchProbabilityInfo for IR blocks.
-uint32_t SelectionDAGBuilder::getEdgeWeight(MachineBasicBlock *Src,
-                                            MachineBasicBlock *Dst) {
+uint32_t SelectionDAGBuilder::getEdgeWeight(const MachineBasicBlock *Src,
+                                            const MachineBasicBlock *Dst) const {
   BranchProbabilityInfo *BPI = FuncInfo.BPI;
   if (!BPI)
     return 0;
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
index 5147b6cb23..36bdf38c48 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
@@ -454,7 +454,8 @@ private:
                                 MachineBasicBlock* Default,
                                 MachineBasicBlock *SwitchBB);
 
-  uint32_t getEdgeWeight(MachineBasicBlock *Src, MachineBasicBlock *Dst);
+  uint32_t getEdgeWeight(const MachineBasicBlock *Src,
+                         const MachineBasicBlock *Dst) const;
   void addSuccessorWithWeight(MachineBasicBlock *Src, MachineBasicBlock *Dst,
                               uint32_t Weight = 0);
 public: