1 //===-- llvm/CodeGen/SSARegMap.h --------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Map register numbers to register classes that are correctly sized (typed) to
11 // hold the information. Assists register allocation. Contained by
12 // MachineFunction, should be deleted by register allocator when it is no
15 //===----------------------------------------------------------------------===//
17 #ifndef LLVM_CODEGEN_SSAREGMAP_H
18 #define LLVM_CODEGEN_SSAREGMAP_H
20 #include "llvm/Target/MRegisterInfo.h"
24 class TargetRegisterClass;
27 std::vector<const TargetRegisterClass*> RegClassMap;
29 unsigned rescale(unsigned Reg) {
30 return Reg - MRegisterInfo::FirstVirtualRegister;
34 const TargetRegisterClass* getRegClass(unsigned Reg) {
35 unsigned actualReg = rescale(Reg);
36 assert(actualReg < RegClassMap.size() && "Register out of bounds");
37 return RegClassMap[actualReg];
40 /// createVirtualRegister - Create and return a new virtual register in the
41 /// function with the specified register class.
43 unsigned createVirtualRegister(const TargetRegisterClass *RegClass) {
44 RegClassMap.push_back(RegClass);
45 return RegClassMap.size()+MRegisterInfo::FirstVirtualRegister-1;
48 unsigned getNumVirtualRegs() const {
49 return RegClassMap.size();
53 } // End llvm namespace