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"
14 // X86Regs - Turn the X86RegisterInfo.def file into a bunch of register
17 static const MRegisterDesc X86Regs[] = {
18 #define R(ENUM, NAME, FLAGS, TSFLAGS) { NAME, FLAGS, TSFLAGS },
19 #include "X86RegisterInfo.def"
22 X86RegisterInfo::X86RegisterInfo()
23 : MRegisterInfo(X86Regs, sizeof(X86Regs)/sizeof(X86Regs[0])) {
27 MachineBasicBlock::iterator
28 X86RegisterInfo::storeReg2RegOffset(MachineBasicBlock *MBB,
29 MachineBasicBlock::iterator MBBI,
30 unsigned SrcReg, unsigned DestReg,
31 unsigned ImmOffset, unsigned dataSize)
34 MachineInstr *MI = addRegOffset(BuildMI(X86::MOVrm32, 5),
35 DestReg, ImmOffset).addReg(SrcReg);
36 return ++(MBB->insert(MBBI, MI));
39 MachineBasicBlock::iterator
40 X86RegisterInfo::loadRegOffset2Reg(MachineBasicBlock *MBB,
41 MachineBasicBlock::iterator MBBI,
42 unsigned DestReg, unsigned SrcReg,
43 unsigned ImmOffset, unsigned dataSize)
46 MachineInstr *MI = addRegOffset(BuildMI(X86::MOVmr32, 5).addReg(DestReg),
48 return ++(MBB->insert(MBBI, MI));
52 unsigned X86RegisterInfo::getFramePointer() const {
56 unsigned X86RegisterInfo::getStackPointer() const {
60 const unsigned* X86RegisterInfo::getCalleeSaveRegs() const {
61 static const unsigned CalleeSaveRegs[] = { X86::ESI, X86::EDI, X86::EBX,
62 MRegisterInfo::NoRegister };
63 return CalleeSaveRegs;
67 const unsigned* X86RegisterInfo::getCallerSaveRegs() const {
68 static const unsigned CallerSaveRegs[] = { X86::EAX, X86::ECX, X86::EDX,
69 MRegisterInfo::NoRegister };
70 return CallerSaveRegs;
73 MachineBasicBlock::iterator
74 X86RegisterInfo::emitPrologue(MachineBasicBlock *MBB,
75 MachineBasicBlock::iterator MBBI,
76 unsigned numBytes) const
81 MI = BuildMI (X86::PUSHr32, 1).addReg(X86::EBP);
82 MBBI = ++(MBB->insert(MBBI, MI));
85 MI = BuildMI (X86::MOVrr32, 2).addReg(X86::EBP).addReg(X86::ESP);
86 MBBI = ++(MBB->insert(MBBI, MI));
88 // adjust stack pointer
89 MI = BuildMI(X86::SUBri32, 2).addReg(X86::ESP).addZImm(numBytes);
90 MBBI = ++(MBB->insert(MBBI, MI));
92 // PUSH all callee-save registers
93 const unsigned* regs = getCalleeSaveRegs();
95 MI = BuildMI(X86::PUSHr32, 1).addReg(*regs);
96 MBBI = ++(MBB->insert(MBBI, MI));
103 MachineBasicBlock::iterator
104 X86RegisterInfo::emitEpilogue(MachineBasicBlock *MBB,
105 MachineBasicBlock::iterator MBBI,
106 unsigned numBytes) const
110 // POP all callee-save registers in REVERSE ORDER
111 static const unsigned regs[] = { X86::EBX, X86::EDI, X86::ESI,
112 MRegisterInfo::NoRegister };
115 MI = BuildMI(X86::POPr32, 1).addReg(regs[idx++]);
116 MBBI = ++(MBB->insert(MBBI, MI));
120 MI = BuildMI(X86::LEAVE, 0);
121 MBBI = ++(MBB->insert(MBBI, MI));