36209d366d
Implement base Calling Convention functionality. Implement stack load/store register operations. Implement call lowering.
60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
//===- XtensaFrameLowering.cpp - Xtensa Frame Information -----------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the Xtensa implementation of TargetFrameLowering class.
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//
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//===----------------------------------------------------------------------===//
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#include "XtensaFrameLowering.h"
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#include "XtensaInstrInfo.h"
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#include "XtensaSubtarget.h"
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#include "llvm/CodeGen/MachineFrameInfo.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/CodeGen/RegisterScavenging.h"
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#include "llvm/IR/Function.h"
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using namespace llvm;
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XtensaFrameLowering::XtensaFrameLowering()
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: TargetFrameLowering(TargetFrameLowering::StackGrowsDown, Align(4), 0,
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Align(4)) {}
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bool XtensaFrameLowering::hasFP(const MachineFunction &MF) const {
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const MachineFrameInfo &MFI = MF.getFrameInfo();
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return MF.getTarget().Options.DisableFramePointerElim(MF) ||
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MFI.hasVarSizedObjects();
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}
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void XtensaFrameLowering::emitPrologue(MachineFunction &MF,
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MachineBasicBlock &MBB) const {}
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void XtensaFrameLowering::emitEpilogue(MachineFunction &MF,
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MachineBasicBlock &MBB) const {}
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// Eliminate ADJCALLSTACKDOWN, ADJCALLSTACKUP pseudo instructions
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MachineBasicBlock::iterator XtensaFrameLowering::eliminateCallFramePseudoInstr(
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MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I) const {
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const XtensaInstrInfo &TII =
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*static_cast<const XtensaInstrInfo *>(MF.getSubtarget().getInstrInfo());
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if (!hasReservedCallFrame(MF)) {
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int64_t Amount = I->getOperand(0).getImm();
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if (I->getOpcode() == Xtensa::ADJCALLSTACKDOWN)
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Amount = -Amount;
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unsigned SP = Xtensa::SP;
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TII.adjustStackPtr(SP, Amount, MBB, I);
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}
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return MBB.erase(I);
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}
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