[PBQP] Re-commit r220642 with a workaround for quirky Visual Studio behavior.

Apparently unique_ptr'ifying NodeMetadata exposed an issue in VS where it
occasionally tries to synthesize copy constructors instead of moves. Hopefully
explicitly deleting the copy constructor and defining the move constructor will
fix this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220649 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/CodeGen/RegAllocPBQP.h b/include/llvm/CodeGen/RegAllocPBQP.h
index 3d242f1..0d379ea 100644 (file)
--- a/include/llvm/CodeGen/RegAllocPBQP.h
+++ b/include/llvm/CodeGen/RegAllocPBQP.h
@@ -62,20 +62,15 @@ public:
     delete[] ColCounts;
   }
 
-  ~MatrixMetadata() {
-    delete[] UnsafeRows;
-    delete[] UnsafeCols;
-  }
-
   unsigned getWorstRow() const { return WorstRow; }
   unsigned getWorstCol() const { return WorstCol; }
-  const bool* getUnsafeRows() const { return UnsafeRows; }
-  const bool* getUnsafeCols() const { return UnsafeCols; }
+  const bool* getUnsafeRows() const { return UnsafeRows.get(); }
+  const bool* getUnsafeCols() const { return UnsafeCols.get(); }
 
 private:
   unsigned WorstRow, WorstCol;
-  bool* UnsafeRows;
-  bool* UnsafeCols;
+  std::unique_ptr<bool[]> UnsafeRows;
+  std::unique_ptr<bool[]> UnsafeCols;
 };
 
 class NodeMetadata {
@@ -88,7 +83,21 @@ public:
                  NotProvablyAllocatable } ReductionState;
 
   NodeMetadata() : RS(Unprocessed), DeniedOpts(0), OptUnsafeEdges(nullptr){}
-  ~NodeMetadata() { delete[] OptUnsafeEdges; }
+
+  NodeMetadata(NodeMetadata &&Other)
+    : RS(Other.RS), NumOpts(Other.NumOpts), DeniedOpts(Other.DeniedOpts),
+      OptUnsafeEdges(std::move(Other.OptUnsafeEdges)), VReg(Other.VReg),
+      OptionRegs(std::move(Other.OptionRegs)) {}
+
+  NodeMetadata& operator=(NodeMetadata &&Other) {
+    RS = Other.RS;
+    NumOpts = Other.NumOpts;
+    DeniedOpts = Other.DeniedOpts;
+    OptUnsafeEdges = std::move(Other.OptUnsafeEdges);
+    VReg = Other.VReg;
+    OptionRegs = std::move(Other.OptionRegs);
+    return *this;
+  }
 
   void setVReg(unsigned VReg) { this->VReg = VReg; }
   unsigned getVReg() const { return VReg; }
@@ -100,7 +109,7 @@ public:
 
   void setup(const Vector& Costs) {
     NumOpts = Costs.getLength() - 1;
-    OptUnsafeEdges = new unsigned[NumOpts]();
+    OptUnsafeEdges = std::unique_ptr<unsigned[]>(new unsigned[NumOpts]());
   }
 
   ReductionState getReductionState() const { return RS; }
@@ -124,15 +133,18 @@ public:
 
   bool isConservativelyAllocatable() const {
     return (DeniedOpts < NumOpts) ||
-      (std::find(OptUnsafeEdges, OptUnsafeEdges + NumOpts, 0) !=
-       OptUnsafeEdges + NumOpts);
+      (std::find(&OptUnsafeEdges[0], &OptUnsafeEdges[NumOpts], 0) !=
+       &OptUnsafeEdges[NumOpts]);
   }
 
 private:
+  NodeMetadata(const NodeMetadata&) LLVM_DELETED_FUNCTION;
+  void operator=(const NodeMetadata&) LLVM_DELETED_FUNCTION;
+
   ReductionState RS;
   unsigned NumOpts;
   unsigned DeniedOpts;
-  unsigned* OptUnsafeEdges;
+  std::unique_ptr<unsigned[]> OptUnsafeEdges;
   unsigned VReg;
   OptionToRegMap OptionRegs;
 };