1 //===- X86RegisterInfo.cpp - X86 Register Information -----------*- C++ -*-===//
3 // This file contains the X86 implementation of the MRegisterInfo class.
5 //===----------------------------------------------------------------------===//
8 #include "X86RegisterInfo.h"
9 #include "X86InstrBuilder.h"
10 #include "llvm/Constants.h"
11 #include "llvm/Type.h"
12 #include "llvm/CodeGen/MachineInstrBuilder.h"
13 #include "llvm/CodeGen/MachineFunction.h"
15 // X86Regs - Turn the X86RegisterInfo.def file into a bunch of register
18 static const MRegisterDesc X86Regs[] = {
19 #define R(ENUM, NAME, FLAGS, TSFLAGS) { NAME, FLAGS, TSFLAGS },
20 #include "X86RegisterInfo.def"
23 X86RegisterInfo::X86RegisterInfo()
24 : MRegisterInfo(X86Regs, sizeof(X86Regs)/sizeof(X86Regs[0])) {
27 unsigned getIdx(unsigned dataSize) {
32 // FIXME: longs handled as ints
34 default: assert(0 && "Invalid data size!");
38 MachineBasicBlock::iterator
39 X86RegisterInfo::storeReg2RegOffset(MachineBasicBlock &MBB,
40 MachineBasicBlock::iterator MBBI,
41 unsigned SrcReg, unsigned DestReg,
42 unsigned ImmOffset, unsigned dataSize)
45 static const unsigned Opcode[] = { X86::MOVrm8, X86::MOVrm16, X86::MOVrm32 };
46 MachineInstr *MI = addRegOffset(BuildMI(Opcode[getIdx(dataSize)], 5),
47 DestReg, ImmOffset).addReg(SrcReg);
48 return ++MBB.insert(MBBI, MI);
51 MachineBasicBlock::iterator
52 X86RegisterInfo::loadRegOffset2Reg(MachineBasicBlock &MBB,
53 MachineBasicBlock::iterator MBBI,
54 unsigned DestReg, unsigned SrcReg,
55 unsigned ImmOffset, unsigned dataSize)
58 static const unsigned Opcode[] = { X86::MOVmr8, X86::MOVmr16, X86::MOVmr32 };
59 MachineInstr *MI = addRegOffset(BuildMI(Opcode[getIdx(dataSize)], 4, DestReg),
61 return ++MBB.insert(MBBI, MI);
64 MachineBasicBlock::iterator
65 X86RegisterInfo::moveReg2Reg(MachineBasicBlock &MBB,
66 MachineBasicBlock::iterator MBBI,
67 unsigned DestReg, unsigned SrcReg,
68 unsigned dataSize) const
70 static const unsigned Opcode[] = { X86::MOVrr8, X86::MOVrr16, X86::MOVrr32 };
71 MachineInstr *MI = BuildMI(Opcode[getIdx(dataSize)],1,DestReg).addReg(SrcReg);
72 return ++MBB.insert(MBBI, MI);
75 MachineBasicBlock::iterator
76 X86RegisterInfo::moveImm2Reg(MachineBasicBlock &MBB,
77 MachineBasicBlock::iterator MBBI,
78 unsigned DestReg, unsigned Imm, unsigned dataSize)
81 static const unsigned Opcode[] = { X86::MOVir8, X86::MOVir16, X86::MOVir32 };
82 MachineInstr *MI = BuildMI(Opcode[getIdx(dataSize)], 1, DestReg).addReg(Imm);
83 return ++MBB.insert(MBBI, MI);
87 unsigned X86RegisterInfo::getFramePointer() const {
91 unsigned X86RegisterInfo::getStackPointer() const {
95 const unsigned* X86RegisterInfo::getCalleeSaveRegs() const {
96 static const unsigned CalleeSaveRegs[] = { X86::ESI, X86::EDI, X86::EBX,
97 MRegisterInfo::NoRegister };
98 return CalleeSaveRegs;
102 const unsigned* X86RegisterInfo::getCallerSaveRegs() const {
103 static const unsigned CallerSaveRegs[] = { X86::EAX, X86::ECX, X86::EDX,
104 MRegisterInfo::NoRegister };
105 return CallerSaveRegs;
108 void X86RegisterInfo::emitPrologue(MachineFunction &MF,
109 unsigned numBytes) const {
110 MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
111 MachineBasicBlock::iterator MBBI = MBB.begin();
114 MachineInstr *MI = BuildMI(X86::PUSHr32, 1).addReg(X86::EBP);
115 MBBI = ++MBB.insert(MBBI, MI);
118 MI = BuildMI(X86::MOVrr32, 1, X86::EBP).addReg(X86::ESP);
119 MBBI = ++MBB.insert(MBBI, MI);
121 // adjust stack pointer: ESP -= numbytes
122 MI = BuildMI(X86::SUBri32, 2, X86::ESP).addReg(X86::ESP).addZImm(numBytes);
123 MBBI = ++MBB.insert(MBBI, MI);
125 // PUSH all callee-save registers
126 const unsigned* regs = getCalleeSaveRegs();
128 MI = BuildMI(X86::PUSHr32, 1).addReg(*regs);
129 MBBI = ++MBB.insert(MBBI, MI);
134 void X86RegisterInfo::emitEpilogue(MachineBasicBlock &MBB,
135 unsigned numBytes) const {
136 MachineBasicBlock::iterator MBBI = --MBB.end();
137 assert((*MBBI)->getOpcode() == X86::RET &&
138 "Can only insert epilog into returning blocks");
140 // POP all callee-save registers in REVERSE ORDER
141 static const unsigned regs[] = { X86::EBX, X86::EDI, X86::ESI,
142 MRegisterInfo::NoRegister };
145 MachineInstr *MI = BuildMI(X86::POPr32, 0, regs[idx++]);
146 MBBI = ++(MBB.insert(MBBI, MI));
150 MBB.insert(MBBI, BuildMI(X86::LEAVE, 0));