MachineRegisterInfo.cpp revision 62ed6b9ade63bf01717ce5274fa11e93e873d245
162ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner//===-- lib/Codegen/MachineRegisterInfo.cpp -------------------------------===// 284bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// 384bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// The LLVM Compiler Infrastructure 484bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// 584bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// This file is distributed under the University of Illinois Open Source 684bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// License. See LICENSE.TXT for details. 784bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// 884bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner//===----------------------------------------------------------------------===// 984bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// 1084bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// Implementation of the MachineRegisterInfo class. 1184bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// 1284bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner//===----------------------------------------------------------------------===// 1384bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner 1484bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner#include "llvm/CodeGen/MachineRegisterInfo.h" 1584bc5427d6883f73cfeae3da640acd011d35c006Chris Lattnerusing namespace llvm; 1684bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner 1784bc5427d6883f73cfeae3da640acd011d35c006Chris LattnerMachineRegisterInfo::MachineRegisterInfo(const MRegisterInfo &MRI) { 1884bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner VRegInfo.reserve(256); 1984bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner UsedPhysRegs.resize(MRI.getNumRegs()); 2062ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner 2162ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner // Create the physreg use/def lists. 2262ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner PhysRegUseDefLists = new MachineOperand*[MRI.getNumRegs()]; 2362ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner memset(PhysRegUseDefLists, 0, sizeof(MachineOperand*)*MRI.getNumRegs()); 2462ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner} 2562ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner 2662ed6b9ade63bf01717ce5274fa11e93e873d245Chris LattnerMachineRegisterInfo::~MachineRegisterInfo() { 2762ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner#ifndef NDEBUG 2862ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner for (unsigned i = 0, e = VRegInfo.size(); i != e; ++i) 2962ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner assert(VRegInfo[i].second == 0 && "Vreg use list non-empty still?"); 3062ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner#endif 3162ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner delete [] PhysRegUseDefLists; 3262ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner} 3362ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner 3462ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner/// HandleVRegListReallocation - We just added a virtual register to the 3562ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner/// VRegInfo info list and it reallocated. Update the use/def lists info 3662ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner/// pointers. 3762ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattnervoid MachineRegisterInfo::HandleVRegListReallocation() { 3862ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner // The back pointers for the vreg lists point into the previous vector. 3962ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner // Update them to point to their correct slots. 4062ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner for (unsigned i = 0, e = VRegInfo.size(); i != e; ++i) { 4162ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner MachineOperand *List = VRegInfo[i].second; 4262ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner if (!List) continue; 4362ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner // Update the back-pointer to be accurate once more. 4462ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner List->Contents.Reg.Prev = &VRegInfo[i].second; 4562ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner } 4684bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner} 47