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//===- MRegisterInfo.cpp - Target Register Information Implementation -----===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file implements the MRegisterInfo interface.
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/MRegisterInfo.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineLocation.h"
#include "llvm/ADT/BitVector.h"
using namespace llvm;
MRegisterInfo::MRegisterInfo(const TargetRegisterDesc *D, unsigned NR,
regclass_iterator RCB, regclass_iterator RCE,
int CFSO, int CFDO)
: Desc(D), NumRegs(NR), RegClassBegin(RCB), RegClassEnd(RCE) {
assert(NumRegs < FirstVirtualRegister &&
"Target has too many physical registers!");
CallFrameSetupOpcode = CFSO;
CallFrameDestroyOpcode = CFDO;
MRegisterInfo::~MRegisterInfo() {}
/// getPhysicalRegisterRegClass - Returns the Register Class of a physical
/// register.
const TargetRegisterClass *
MRegisterInfo::getPhysicalRegisterRegClass(MVT::ValueType VT,
unsigned reg) const {
assert(isPhysicalRegister(reg) && "reg must be a physical register");
// Pick the register class of the right type that contains this physreg.
for (regclass_iterator I = regclass_begin(), E = regclass_end(); I != E; ++I)
if ((*I)->hasType(VT) && (*I)->contains(reg))
return *I;
assert(false && "Couldn't find the register class");
return 0;
/// getAllocatableSetForRC - Toggle the bits that represent allocatable
/// registers for the specific register class.
static void getAllocatableSetForRC(MachineFunction &MF,
const TargetRegisterClass *RC, BitVector &R){
for (TargetRegisterClass::iterator I = RC->allocation_order_begin(MF),
E = RC->allocation_order_end(MF); I != E; ++I)
BitVector MRegisterInfo::getAllocatableSet(MachineFunction &MF,
const TargetRegisterClass *RC) const {
BitVector Allocatable(NumRegs);
if (RC) {
getAllocatableSetForRC(MF, RC, Allocatable);
return Allocatable;
for (MRegisterInfo::regclass_iterator I = regclass_begin(),
E = regclass_end(); I != E; ++I)
getAllocatableSetForRC(MF, *I, Allocatable);
return Allocatable;
/// getLocation - This method should return the actual location of a frame
/// variable given the frame index. The location is returned in ML.
/// Subclasses should override this method for special handling of frame
/// variables and then call MRegisterInfo::getLocation for the default action.
void MRegisterInfo::getLocation(MachineFunction &MF, unsigned Index,
MachineLocation &ML) const {
const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
MachineFrameInfo *MFI = MF.getFrameInfo();
MFI->getObjectOffset(Index) +
MFI->getStackSize() -
TFI.getOffsetOfLocalArea() +
/// getInitialFrameState - Returns a list of machine moves that are assumed
/// on entry to a function.
MRegisterInfo::getInitialFrameState(std::vector<MachineMove> &Moves) const {
// Default is to do nothing.