| 1 | //===- XtensaFrameLowering.cpp - Xtensa Frame Information -----------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file contains the Xtensa implementation of TargetFrameLowering class. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |
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| 13 | #include "XtensaFrameLowering.h" |
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| 14 | #include "XtensaInstrInfo.h" |
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| 15 | #include "XtensaSubtarget.h" |
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| 16 | #include "llvm/CodeGen/MachineFrameInfo.h" |
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| 17 | #include "llvm/CodeGen/MachineInstrBuilder.h" |
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| 18 | #include "llvm/CodeGen/MachineModuleInfo.h" |
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| 19 | #include "llvm/CodeGen/MachineRegisterInfo.h" |
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| 20 | #include "llvm/CodeGen/RegisterScavenging.h" |
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| 21 | #include "llvm/IR/Function.h" |
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| 22 | |
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| 23 | using namespace llvm; |
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| 24 | |
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| 25 | XtensaFrameLowering::XtensaFrameLowering() |
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| 26 | : TargetFrameLowering(TargetFrameLowering::StackGrowsDown, Align(4), 0, |
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| 27 | Align(4)) {} |
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| 28 | |
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| 29 | bool XtensaFrameLowering::hasFP(const MachineFunction &MF) const { |
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| 30 | const MachineFrameInfo &MFI = MF.getFrameInfo(); |
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| 31 | return MF.getTarget().Options.DisableFramePointerElim(MF) || |
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| 32 | MFI.hasVarSizedObjects(); |
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| 33 | } |
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| 34 | |
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| 35 | void XtensaFrameLowering::emitPrologue(MachineFunction &MF, |
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| 36 | MachineBasicBlock &MBB) const {} |
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| 37 | |
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| 38 | void XtensaFrameLowering::emitEpilogue(MachineFunction &MF, |
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| 39 | MachineBasicBlock &MBB) const {} |
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| 40 | |
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| 41 | // Eliminate ADJCALLSTACKDOWN, ADJCALLSTACKUP pseudo instructions |
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| 42 | MachineBasicBlock::iterator XtensaFrameLowering::eliminateCallFramePseudoInstr( |
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| 43 | MachineFunction &MF, MachineBasicBlock &MBB, |
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| 44 | MachineBasicBlock::iterator I) const { |
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| 45 | const XtensaInstrInfo &TII = |
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| 46 | *static_cast<const XtensaInstrInfo *>(MF.getSubtarget().getInstrInfo()); |
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| 47 | |
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| 48 | if (!hasReservedCallFrame(MF)) { |
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| 49 | int64_t Amount = I->getOperand(i: 0).getImm(); |
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| 50 | |
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| 51 | if (I->getOpcode() == Xtensa::ADJCALLSTACKDOWN) |
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| 52 | Amount = -Amount; |
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| 53 | |
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| 54 | unsigned SP = Xtensa::SP; |
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| 55 | TII.adjustStackPtr(SP, Amount, MBB, I); |
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| 56 | } |
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| 57 | |
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| 58 | return MBB.erase(I); |
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| 59 | } |
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| 60 | |
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