From f46e7e3d7ff56d91572350c45ade83f4deea0139 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Mon, 27 Jun 2011 23:54:40 +0000
Subject: [PATCH] Remove RegClass2VRegMap from MachineRegisterInfo.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133967 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/MachineRegisterInfo.h | 12 ------------
 lib/CodeGen/MachineRegisterInfo.cpp        | 14 --------------
 2 files changed, 26 deletions(-)

diff --git a/include/llvm/CodeGen/MachineRegisterInfo.h b/include/llvm/CodeGen/MachineRegisterInfo.h
index 74df8da20ed..87541086b22 100644
--- a/include/llvm/CodeGen/MachineRegisterInfo.h
+++ b/include/llvm/CodeGen/MachineRegisterInfo.h
@@ -32,11 +32,6 @@ class MachineRegisterInfo {
   IndexedMap<std::pair<const TargetRegisterClass*, MachineOperand*>,
              VirtReg2IndexFunctor> VRegInfo;
 
-  /// RegClassVRegMap - This vector acts as a map from TargetRegisterClass to
-  /// virtual registers. For each target register class, it keeps a list of
-  /// virtual registers belonging to the class.
-  std::vector<unsigned> *RegClass2VRegMap;
-
   /// RegAllocHints - This vector records register allocation hints for virtual
   /// registers. For each virtual register, it keeps a register and hint type
   /// pair making up the allocation hint. Hint type is target specific except
@@ -216,13 +211,6 @@ public:
   ///
   unsigned getNumVirtRegs() const { return VRegInfo.size(); }
 
-  /// getRegClassVirtRegs - Return the list of virtual registers of the given
-  /// target register class.
-  const std::vector<unsigned> &
-  getRegClassVirtRegs(const TargetRegisterClass *RC) const {
-    return RegClass2VRegMap[RC->getID()];
-  }
-
   /// setRegAllocationHint - Specify a register allocation hint for the
   /// specified virtual register.
   void setRegAllocationHint(unsigned Reg, unsigned Type, unsigned PrefReg) {
diff --git a/lib/CodeGen/MachineRegisterInfo.cpp b/lib/CodeGen/MachineRegisterInfo.cpp
index 08ff5bb7152..4b3e64c25f6 100644
--- a/lib/CodeGen/MachineRegisterInfo.cpp
+++ b/lib/CodeGen/MachineRegisterInfo.cpp
@@ -20,7 +20,6 @@ using namespace llvm;
 MachineRegisterInfo::MachineRegisterInfo(const TargetRegisterInfo &TRI) {
   VRegInfo.reserve(256);
   RegAllocHints.reserve(256);
-  RegClass2VRegMap = new std::vector<unsigned>[TRI.getNumRegClasses()];
   UsedPhysRegs.resize(TRI.getNumRegs());
   
   // Create the physreg use/def lists.
@@ -38,25 +37,13 @@ MachineRegisterInfo::~MachineRegisterInfo() {
            "PhysRegUseDefLists has entries after all instructions are deleted");
 #endif
   delete [] PhysRegUseDefLists;
-  delete [] RegClass2VRegMap;
 }
 
 /// setRegClass - Set the register class of the specified virtual register.
 ///
 void
 MachineRegisterInfo::setRegClass(unsigned Reg, const TargetRegisterClass *RC) {
-  const TargetRegisterClass *OldRC = VRegInfo[Reg].first;
   VRegInfo[Reg].first = RC;
-
-  // Remove from old register class's vregs list. This may be slow but
-  // fortunately this operation is rarely needed.
-  std::vector<unsigned> &VRegs = RegClass2VRegMap[OldRC->getID()];
-  std::vector<unsigned>::iterator I =
-    std::find(VRegs.begin(), VRegs.end(), Reg);
-  VRegs.erase(I);
-
-  // Add to new register class's vregs list.
-  RegClass2VRegMap[RC->getID()].push_back(Reg);
 }
 
 const TargetRegisterClass *
@@ -95,7 +82,6 @@ MachineRegisterInfo::createVirtualRegister(const TargetRegisterClass *RegClass){
   if (ArrayBase && &VRegInfo[FirstVirtReg] != ArrayBase)
     // The vector reallocated, handle this now.
     HandleVRegListReallocation();
-  RegClass2VRegMap[RegClass->getID()].push_back(Reg);
   return Reg;
 }
 
-- 
2.34.1