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ff1547890a
we will do that when we implement the full save/restore. Patch by Reed Kotler. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164051 91177308-0d34-0410-b5e6-96231b3b80d8
92 lines
3.2 KiB
C++
92 lines
3.2 KiB
C++
//===-- Mips16FrameLowering.cpp - Mips16 Frame Information ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the Mips16 implementation of TargetFrameLowering class.
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//
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//===----------------------------------------------------------------------===//
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#include "Mips16FrameLowering.h"
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#include "MipsInstrInfo.h"
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#include "MCTargetDesc/MipsBaseInfo.h"
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#include "llvm/Function.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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void Mips16FrameLowering::emitPrologue(MachineFunction &MF) const {
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MachineBasicBlock &MBB = MF.front();
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MachineFrameInfo *MFI = MF.getFrameInfo();
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const MipsInstrInfo &TII =
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*static_cast<const MipsInstrInfo*>(MF.getTarget().getInstrInfo());
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MachineBasicBlock::iterator MBBI = MBB.begin();
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DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
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uint64_t StackSize = MFI->getStackSize();
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StackSize += 16; // need to allocate space for RA. Clean this up later
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// when we fix the save/restore instruction. TBD..
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// No need to allocate space on the stack.
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if (StackSize == 0 && !MFI->adjustsStack()) return;
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// Adjust stack.
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if (isInt<16>(-StackSize))
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BuildMI(MBB, MBBI, dl, TII.get(Mips::SaveRaF16)).addImm(StackSize);
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}
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void Mips16FrameLowering::emitEpilogue(MachineFunction &MF,
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MachineBasicBlock &MBB) const {
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MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr();
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MachineFrameInfo *MFI = MF.getFrameInfo();
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const MipsInstrInfo &TII =
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*static_cast<const MipsInstrInfo*>(MF.getTarget().getInstrInfo());
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DebugLoc dl = MBBI->getDebugLoc();
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uint64_t StackSize = MFI->getStackSize();
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StackSize += 16; // need to allocate space for RA. Clean this up later
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// when we fix the save/restore instruction. TBD..
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if (!StackSize)
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return;
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// Adjust stack.
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if (isInt<16>(StackSize))
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// assumes stacksize multiple of 8
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BuildMI(MBB, MBBI, dl, TII.get(Mips::RestoreRaF16)).addImm(StackSize);
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}
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bool Mips16FrameLowering::
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spillCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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const std::vector<CalleeSavedInfo> &CSI,
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const TargetRegisterInfo *TRI) const {
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// FIXME: implement.
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return true;
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}
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bool
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Mips16FrameLowering::hasReservedCallFrame(const MachineFunction &MF) const {
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// FIXME: implement.
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return true;
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}
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void Mips16FrameLowering::
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processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
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RegScavenger *RS) const {
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}
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const MipsFrameLowering *
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llvm::createMips16FrameLowering(const MipsSubtarget &ST) {
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return new Mips16FrameLowering(ST);
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}
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