Use OwningArrayRef.

Author: kazutakahirata

llvm/include/llvm/CodeGen/RegAllocPBQP.h

@@ -184,15 +184,14 @@ class NodeMetadata {
   NodeMetadata() = default;
 
   NodeMetadata(const NodeMetadata &Other)
-      : RS(Other.RS), NumOpts(Other.NumOpts), DeniedOpts(Other.DeniedOpts),
-        OptUnsafeEdges(new unsigned[NumOpts]), VReg(Other.VReg),
-        AllowedRegs(Other.AllowedRegs)
+      : RS(Other.RS), DeniedOpts(Other.DeniedOpts),
+        OptUnsafeEdges(ArrayRef<unsigned>(Other.OptUnsafeEdges)),
+        VReg(Other.VReg), AllowedRegs(Other.AllowedRegs)
 #if LLVM_ENABLE_ABI_BREAKING_CHECKS
         ,
         everConservativelyAllocatable(Other.everConservativelyAllocatable)
 #endif
   {
-    llvm::copy(Other.optUnsafeEdges(), &OptUnsafeEdges[0]);
   }
 
   NodeMetadata(NodeMetadata &&) = default;
@@ -207,8 +206,7 @@ class NodeMetadata {
   const AllowedRegVector& getAllowedRegs() const { return *AllowedRegs; }
 
   void setup(const Vector& Costs) {
-    NumOpts = Costs.getLength() - 1;
-    OptUnsafeEdges = std::unique_ptr<unsigned[]>(new unsigned[NumOpts]());
+    OptUnsafeEdges = OwningArrayRef<unsigned>(Costs.getLength() - 1);
   }
 
   ReductionState getReductionState() const { return RS; }
@@ -228,20 +226,21 @@ class NodeMetadata {
     DeniedOpts += Transpose ? MD.getWorstRow() : MD.getWorstCol();
     const bool* UnsafeOpts =
       Transpose ? MD.getUnsafeCols() : MD.getUnsafeRows();
-    for (unsigned i = 0; i < NumOpts; ++i)
+    for (unsigned i = 0; i < OptUnsafeEdges.size(); ++i)
       OptUnsafeEdges[i] += UnsafeOpts[i];
   }
 
   void handleRemoveEdge(const MatrixMetadata& MD, bool Transpose) {
     DeniedOpts -= Transpose ? MD.getWorstRow() : MD.getWorstCol();
     const bool* UnsafeOpts =
       Transpose ? MD.getUnsafeCols() : MD.getUnsafeRows();
-    for (unsigned i = 0; i < NumOpts; ++i)
+    for (unsigned i = 0; i < OptUnsafeEdges.size(); ++i)
       OptUnsafeEdges[i] -= UnsafeOpts[i];
   }
 
   bool isConservativelyAllocatable() const {
-    return (DeniedOpts < NumOpts) || llvm::is_contained(optUnsafeEdges(), 0);
+    return (DeniedOpts < OptUnsafeEdges.size()) ||
+           llvm::is_contained(OptUnsafeEdges, 0);
   }
 
 #if LLVM_ENABLE_ABI_BREAKING_CHECKS
@@ -252,16 +251,11 @@ class NodeMetadata {
 
 private:
   ReductionState RS = Unprocessed;
-  unsigned NumOpts = 0;
   unsigned DeniedOpts = 0;
-  std::unique_ptr<unsigned[]> OptUnsafeEdges;
+  OwningArrayRef<unsigned> OptUnsafeEdges;
   Register VReg;
   GraphMetadata::AllowedRegVecRef AllowedRegs;
 
-  ArrayRef<unsigned> optUnsafeEdges() const {
-    return ArrayRef<unsigned>(OptUnsafeEdges.get(), NumOpts);
-  }
-
 #if LLVM_ENABLE_ABI_BREAKING_CHECKS
   bool everConservativelyAllocatable = false;
 #endif