SparcRegisterInfo.cpp revision 01d0efba3982e98e2dc7bc534406fbf9fd1af137
1//===- SparcV8RegisterInfo.cpp - SparcV8 Register Information ---*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 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. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file contains the SparcV8 implementation of the MRegisterInfo class. 11// 12//===----------------------------------------------------------------------===// 13 14#include "SparcV8.h" 15#include "SparcV8RegisterInfo.h" 16#include "llvm/CodeGen/MachineInstrBuilder.h" 17#include "llvm/CodeGen/MachineFunction.h" 18#include "llvm/CodeGen/MachineFrameInfo.h" 19#include "llvm/Type.h" 20#include "Support/STLExtras.h" 21#include <iostream> 22using namespace llvm; 23 24SparcV8RegisterInfo::SparcV8RegisterInfo() 25 : SparcV8GenRegisterInfo(V8::ADJCALLSTACKDOWN, 26 V8::ADJCALLSTACKUP) {} 27 28void SparcV8RegisterInfo:: 29storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, 30 unsigned SrcReg, int FrameIdx) const { 31 const TargetRegisterClass *RC = getRegClass(SrcReg); 32 33 // On the order of operands here: think "[FrameIdx + 0] = SrcReg". 34 if (RC == SparcV8::IntRegsRegisterClass) 35 BuildMI (MBB, I, V8::ST, 3).addFrameIndex (FrameIdx).addSImm (0) 36 .addReg (SrcReg); 37 else if (RC == SparcV8::FPRegsRegisterClass) 38 BuildMI (MBB, I, V8::STFri, 3).addFrameIndex (FrameIdx).addSImm (0) 39 .addReg (SrcReg); 40 else if (RC == SparcV8::DFPRegsRegisterClass) 41 BuildMI (MBB, I, V8::STDFri, 3).addFrameIndex (FrameIdx).addSImm (0) 42 .addReg (SrcReg); 43 else 44 assert (0 && "Can't store this register to stack slot"); 45} 46 47void SparcV8RegisterInfo:: 48loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, 49 unsigned DestReg, int FrameIdx) const { 50 const TargetRegisterClass *RC = getRegClass(DestReg); 51 if (RC == SparcV8::IntRegsRegisterClass) 52 BuildMI (MBB, I, V8::LD, 2, DestReg).addFrameIndex (FrameIdx).addSImm (0); 53 else if (RC == SparcV8::FPRegsRegisterClass) 54 BuildMI (MBB, I, V8::LDFri, 2, DestReg).addFrameIndex (FrameIdx) 55 .addSImm (0); 56 else if (RC == SparcV8::DFPRegsRegisterClass) 57 BuildMI (MBB, I, V8::LDDFri, 2, DestReg).addFrameIndex (FrameIdx) 58 .addSImm (0); 59 else 60 assert(0 && "Can't load this register from stack slot"); 61} 62 63void SparcV8RegisterInfo::copyRegToReg(MachineBasicBlock &MBB, 64 MachineBasicBlock::iterator I, 65 unsigned DestReg, unsigned SrcReg, 66 const TargetRegisterClass *RC) const { 67 if (RC == SparcV8::IntRegsRegisterClass) 68 BuildMI (MBB, I, V8::ORrr, 2, DestReg).addReg (V8::G0).addReg (SrcReg); 69 else if (RC == SparcV8::FPRegsRegisterClass) 70 BuildMI (MBB, I, V8::FMOVS, 1, DestReg).addReg (SrcReg); 71 else 72 assert (0 && "Can't copy this register"); 73} 74 75void SparcV8RegisterInfo:: 76eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, 77 MachineBasicBlock::iterator I) const { 78 std::cerr 79 << "Sorry, I don't know how to eliminate call frame pseudo instrs yet, in\n" 80 << __FUNCTION__ << " at " << __FILE__ << ":" << __LINE__ << "\n"; 81 abort(); 82} 83 84void 85SparcV8RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II) const { 86 unsigned i = 0; 87 MachineInstr &MI = *II; 88 while (!MI.getOperand(i).isFrameIndex()) { 89 ++i; 90 assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!"); 91 } 92 93 int FrameIndex = MI.getOperand(i).getFrameIndex(); 94 95 // Replace frame index with a frame pointer reference 96 MI.SetMachineOperandReg (i, V8::FP); 97 98 // Addressable stack objects are accessed using neg. offsets from %fp 99 MachineFunction &MF = *MI.getParent()->getParent(); 100 int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) + 101 MI.getOperand(i+1).getImmedValue(); 102 // note: Offset < 0 103 MI.SetMachineOperandConst (i+1, MachineOperand::MO_SignExtendedImmed, Offset); 104} 105 106void SparcV8RegisterInfo:: 107processFunctionBeforeFrameFinalized(MachineFunction &MF) const {} 108 109void SparcV8RegisterInfo::emitPrologue(MachineFunction &MF) const { 110 MachineBasicBlock &MBB = MF.front(); 111 MachineFrameInfo *MFI = MF.getFrameInfo(); 112 113 // Get the number of bytes to allocate from the FrameInfo 114 int NumBytes = (int) MFI->getStackSize(); 115 116 // Emit the correct save instruction based on the number of bytes in the frame. 117 // Minimum stack frame size according to V8 ABI is: 118 // 16 words for register window spill 119 // 1 word for address of returned aggregate-value 120 // + 6 words for passing parameters on the stack 121 // ---------- 122 // 23 words * 4 bytes per word = 92 bytes 123 NumBytes += 92; 124 // Round up to next doubleword boundary -- a double-word boundary 125 // is required by the ABI. 126 NumBytes = (NumBytes + 7) & ~7; 127 BuildMI(MBB, MBB.begin(), V8::SAVEri, 2, 128 V8::SP).addImm(-NumBytes).addReg(V8::SP); 129} 130 131void SparcV8RegisterInfo::emitEpilogue(MachineFunction &MF, 132 MachineBasicBlock &MBB) const { 133 MachineBasicBlock::iterator MBBI = prior(MBB.end()); 134 assert(MBBI->getOpcode() == V8::RETL && 135 "Can only put epilog before 'retl' instruction!"); 136 BuildMI(MBB, MBBI, V8::RESTORErr, 2, V8::G0).addReg(V8::G0).addReg(V8::G0); 137} 138 139#include "SparcV8GenRegisterInfo.inc" 140 141const TargetRegisterClass* 142SparcV8RegisterInfo::getRegClassForType(const Type* Ty) const { 143 switch (Ty->getTypeID()) { 144 case Type::FloatTyID: return &FPRegsInstance; 145 case Type::DoubleTyID: return &DFPRegsInstance; 146 case Type::LongTyID: 147 case Type::ULongTyID: assert(0 && "Long values do not fit in registers!"); 148 default: assert(0 && "Invalid type to getClass!"); 149 case Type::BoolTyID: 150 case Type::SByteTyID: 151 case Type::UByteTyID: 152 case Type::ShortTyID: 153 case Type::UShortTyID: 154 case Type::IntTyID: 155 case Type::UIntTyID: 156 case Type::PointerTyID: return &IntRegsInstance; 157 } 158} 159 160