CodeGen: Make RegAllocRegistry a template class

[arsenm]

Summary

Will allow re-using the machinery for independent
sets of register allocators.

This will allow AMDGPU to use separate command line
options for the allocator to use for SGPRs separate
from VGPRs.

[arsenm]

ping

[arsenm]

r354687

include/llvm/CodeGen/RegAllocRegistry.h

 #include "llvm/CodeGen/MachinePassRegistry.h"
 
 namespace llvm {
 
 class FunctionPass;
 
 //===----------------------------------------------------------------------===//
 ///
-/// RegisterRegAlloc class - Track the registration of register allocators.
+/// RegisterRegAllocBase class - Track the registration of register allocators.
 ///
 //===----------------------------------------------------------------------===//
-class RegisterRegAlloc : public MachinePassRegistryNode<FunctionPass *(*)()> {
+template <class SubClass>
+class RegisterRegAllocBase : public MachinePassRegistryNode<FunctionPass *(*)()> {
 public:
   using FunctionPassCtor = FunctionPass *(*)();
 
   static MachinePassRegistry<FunctionPassCtor> Registry;
 
-  RegisterRegAlloc(const char *N, const char *D, FunctionPassCtor C)
+  RegisterRegAllocBase(const char *N, const char *D, FunctionPassCtor C)
       : MachinePassRegistryNode(N, D, C) {
     Registry.Add(this);
   }
 
-  ~RegisterRegAlloc() { Registry.Remove(this); }
+  ~RegisterRegAllocBase() { Registry.Remove(this); }
 
   // Accessors.
-  RegisterRegAlloc *getNext() const {
-    return (RegisterRegAlloc *)MachinePassRegistryNode::getNext();
+  SubClass *getNext() const {
+    return static_cast<SubClass *>(MachinePassRegistryNode::getNext());
   }
 
-  static RegisterRegAlloc *getList() {
-    return (RegisterRegAlloc *)Registry.getList();
+  static SubClass *getList() {
+    return static_cast<SubClass *>(Registry.getList());
   }
 
   static FunctionPassCtor getDefault() { return Registry.getDefault(); }
 
   static void setDefault(FunctionPassCtor C) { Registry.setDefault(C); }
 
   static void setListener(MachinePassRegistryListener<FunctionPassCtor> *L) {
     Registry.setListener(L);
   }
 };
 
+class RegisterRegAlloc : public RegisterRegAllocBase<RegisterRegAlloc> {
+public:
+  RegisterRegAlloc(const char *N, const char *D, FunctionPassCtor C)
+    : RegisterRegAllocBase(N, D, C) {}
+};
+
+/// RegisterRegAlloc's global Registry tracks allocator registration.
+template <class T>
+MachinePassRegistry<RegisterRegAlloc::FunctionPassCtor>
+RegisterRegAllocBase<T>::Registry;
+
 } // end namespace llvm
 
 #endif // LLVM_CODEGEN_REGALLOCREGISTRY_H

lib/CodeGen/TargetPassConfig.cpp

bool TargetPassConfig::getOptimizeRegAlloc() const {
   switch (OptimizeRegAlloc) {
   case cl::BOU_UNSET: return getOptLevel() != CodeGenOpt::None;
   case cl::BOU_TRUE:  return true;
   case cl::BOU_FALSE: return false;
   }
   llvm_unreachable("Invalid optimize-regalloc state");
 }
 
-/// RegisterRegAlloc's global Registry tracks allocator registration.
-MachinePassRegistry<RegisterRegAlloc::FunctionPassCtor>
-    RegisterRegAlloc::Registry;
-
 /// A dummy default pass factory indicates whether the register allocator is
 /// overridden on the command line.
 static llvm::once_flag InitializeDefaultRegisterAllocatorFlag;
 
 static RegisterRegAlloc
 defaultRegAlloc("default",
                 "pick register allocator based on -O option",
                 useDefaultRegisterAllocator);