More dead code elimination in VirtRegMap.

This thing is looking a lot like a virtual register map now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144486 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/VirtRegMap.cpp

@@ -19,7 +19,6 @@
 #define DEBUG_TYPE "virtregmap"
 #include "VirtRegMap.h"
 #include "llvm/Function.h"
-#include "llvm/CodeGen/LiveIntervalAnalysis.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
@@ -32,12 +31,8 @@
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/ADT/BitVector.h"
-#include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/DepthFirstIterator.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/SmallSet.h"
 #include <algorithm>
 using namespace llvm;
 
@@ -62,14 +57,7 @@ bool VirtRegMap::runOnMachineFunction(MachineFunction &mf) {
   Virt2StackSlotMap.clear();
   Virt2SplitMap.clear();
 
-  allocatableRCRegs.clear();
-  for (TargetRegisterInfo::regclass_iterator I = TRI->regclass_begin(),
-         E = TRI->regclass_end(); I != E; ++I)
-    allocatableRCRegs.insert(std::make_pair(*I,
-                                            TRI->getAllocatableSet(mf, *I)));
-
   grow();
-  
   return false;
 }
 

lib/CodeGen/VirtRegMap.h

@@ -18,22 +18,14 @@
 #define LLVM_CODEGEN_VIRTREGMAP_H
 
 #include "llvm/CodeGen/MachineFunctionPass.h"
-#include "llvm/CodeGen/LiveInterval.h"
 #include "llvm/Target/TargetRegisterInfo.h"
-#include "llvm/ADT/BitVector.h"
-#include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/IndexedMap.h"
-#include "llvm/ADT/SmallPtrSet.h"
-#include "llvm/ADT/SmallVector.h"
-#include <map>
 
 namespace llvm {
-  class LiveIntervals;
   class MachineInstr;
   class MachineFunction;
   class MachineRegisterInfo;
   class TargetInstrInfo;
-  class TargetRegisterInfo;
   class raw_ostream;
   class SlotIndexes;
 
@@ -45,18 +37,12 @@ namespace llvm {
       MAX_STACK_SLOT = (1L << 18)-1
     };
 
-    enum ModRef { isRef = 1, isMod = 2, isModRef = 3 };
-    typedef std::multimap<MachineInstr*,
-                          std::pair<unsigned, ModRef> > MI2VirtMapTy;
-
   private:
     MachineRegisterInfo *MRI;
     const TargetInstrInfo *TII;
     const TargetRegisterInfo *TRI;
     MachineFunction *MF;
 
-    DenseMap<const TargetRegisterClass*, BitVector> allocatableRCRegs;
-
     /// Virt2PhysMap - This is a virtual to physical register
     /// mapping. Each virtual register is required to have an entry in
     /// it; even spilled virtual registers (the register mapped to a