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https://github.com/c64scene-ar/llvm-6502.git
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2adb3959f6
removed EBP from the list of callee-saved registers (it isn't one). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4929 91177308-0d34-0410-b5e6-96231b3b80d8
125 lines
3.7 KiB
C++
125 lines
3.7 KiB
C++
//===- X86RegisterInfo.cpp - X86 Register Information -----------*- C++ -*-===//
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//
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// This file contains the X86 implementation of the MRegisterInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "X86.h"
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#include "X86RegisterInfo.h"
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#include "X86InstrBuilder.h"
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#include "llvm/Constants.h"
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#include "llvm/Type.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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// X86Regs - Turn the X86RegisterInfo.def file into a bunch of register
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// descriptors
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//
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static const MRegisterDesc X86Regs[] = {
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#define R(ENUM, NAME, FLAGS, TSFLAGS) { NAME, FLAGS, TSFLAGS },
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#include "X86RegisterInfo.def"
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};
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X86RegisterInfo::X86RegisterInfo()
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: MRegisterInfo(X86Regs, sizeof(X86Regs)/sizeof(X86Regs[0])) {
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}
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MachineBasicBlock::iterator
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X86RegisterInfo::storeReg2RegOffset(MachineBasicBlock *MBB,
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MachineBasicBlock::iterator MBBI,
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unsigned SrcReg, unsigned DestReg,
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unsigned ImmOffset, unsigned dataSize)
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const
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{
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MachineInstr *MI = addRegOffset(BuildMI(X86::MOVrm32, 5),
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DestReg, ImmOffset).addReg(SrcReg);
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return ++(MBB->insert(MBBI, MI));
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}
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MachineBasicBlock::iterator
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X86RegisterInfo::loadRegOffset2Reg(MachineBasicBlock *MBB,
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MachineBasicBlock::iterator MBBI,
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unsigned DestReg, unsigned SrcReg,
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unsigned ImmOffset, unsigned dataSize)
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const
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{
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MachineInstr *MI = addRegOffset(BuildMI(X86::MOVmr32, 5).addReg(DestReg),
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SrcReg, ImmOffset);
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return ++(MBB->insert(MBBI, MI));
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}
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unsigned X86RegisterInfo::getFramePointer() const {
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return X86::EBP;
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}
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unsigned X86RegisterInfo::getStackPointer() const {
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return X86::ESP;
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}
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const unsigned* X86RegisterInfo::getCalleeSaveRegs() const {
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static const unsigned CalleeSaveRegs[] = { X86::ESI, X86::EDI, X86::EBX,
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MRegisterInfo::NoRegister };
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return CalleeSaveRegs;
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}
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const unsigned* X86RegisterInfo::getCallerSaveRegs() const {
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static const unsigned CallerSaveRegs[] = { X86::EAX, X86::ECX, X86::EDX,
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MRegisterInfo::NoRegister };
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return CallerSaveRegs;
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}
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MachineBasicBlock::iterator
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X86RegisterInfo::emitPrologue(MachineBasicBlock *MBB,
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MachineBasicBlock::iterator MBBI,
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unsigned numBytes) const
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{
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MachineInstr *MI;
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// PUSH ebp
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MI = BuildMI (X86::PUSHr32, 1).addReg(X86::EBP);
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MBBI = ++(MBB->insert(MBBI, MI));
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// MOV ebp, esp
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MI = BuildMI (X86::MOVrr32, 2).addReg(X86::EBP).addReg(X86::ESP);
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MBBI = ++(MBB->insert(MBBI, MI));
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// adjust stack pointer
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MI = BuildMI(X86::SUBri32, 2).addReg(X86::ESP).addZImm(numBytes);
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MBBI = ++(MBB->insert(MBBI, MI));
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// PUSH all callee-save registers
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const unsigned* regs = getCalleeSaveRegs();
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while (*regs) {
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MI = BuildMI(X86::PUSHr32, 1).addReg(*regs);
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MBBI = ++(MBB->insert(MBBI, MI));
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++regs;
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}
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return MBBI;
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}
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MachineBasicBlock::iterator
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X86RegisterInfo::emitEpilogue(MachineBasicBlock *MBB,
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MachineBasicBlock::iterator MBBI,
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unsigned numBytes) const
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{
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MachineInstr *MI;
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// POP all callee-save registers in REVERSE ORDER
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static const unsigned regs[] = { X86::EBX, X86::EDI, X86::ESI,
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MRegisterInfo::NoRegister };
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unsigned idx = 0;
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while (regs[idx]) {
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MI = BuildMI(X86::POPr32, 1).addReg(regs[idx++]);
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MBBI = ++(MBB->insert(MBBI, MI));
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}
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// insert LEAVE
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MI = BuildMI(X86::LEAVE, 0);
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MBBI = ++(MBB->insert(MBBI, MI));
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return MBBI;
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}
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