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//===-- VEFrameLowering.h - Define frame lowering for VE --*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This class implements VE-specific bits of TargetFrameLowering class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_VE_VEFRAMELOWERING_H
#define LLVM_LIB_TARGET_VE_VEFRAMELOWERING_H
#include "VE.h"
#include "llvm/CodeGen/TargetFrameLowering.h"
namespace llvm {
class VESubtarget;
class VEFrameLowering : public TargetFrameLowering {
public:
explicit VEFrameLowering(const VESubtarget &ST);
/// emitProlog/emitEpilog - These methods insert prolog and epilog code into
/// the function.
void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
void emitPrologueInsns(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI, uint64_t NumBytes,
bool RequireFPUpdate) const;
void emitEpilogueInsns(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI, uint64_t NumBytes,
bool RequireFPUpdate) const;
MachineBasicBlock::iterator
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const override;
bool hasBP(const MachineFunction &MF) const;
bool hasFP(const MachineFunction &MF) const override;
// VE reserves argument space always for call sites in the function
// immediately on entry of the current function.
bool hasReservedCallFrame(const MachineFunction &MF) const override {
return true;
}
void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
RegScavenger *RS = nullptr) const override;
int getFrameIndexReference(const MachineFunction &MF, int FI,
Register &FrameReg) const override;
const SpillSlot *
getCalleeSavedSpillSlots(unsigned &NumEntries) const override {
static const SpillSlot Offsets[] = {
{VE::SX17, 40}, {VE::SX18, 48}, {VE::SX19, 56}, {VE::SX20, 64},
{VE::SX21, 72}, {VE::SX22, 80}, {VE::SX23, 88}, {VE::SX24, 96},
{VE::SX25, 104}, {VE::SX26, 112}, {VE::SX27, 120}, {VE::SX28, 128},
{VE::SX29, 136}, {VE::SX30, 144}, {VE::SX31, 152}, {VE::SX32, 160},
{VE::SX33, 168}};
NumEntries = array_lengthof(Offsets);
return Offsets;
}
protected:
const VESubtarget &STI;
private:
// Returns true if MF is a leaf procedure.
bool isLeafProc(MachineFunction &MF) const;
// Emits code for adjusting SP in function prologue/epilogue.
void emitSPAdjustment(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI, int64_t NumBytes,
MaybeAlign MayAlign = MaybeAlign()) const;
// Emits code for extending SP in function prologue/epilogue.
void emitSPExtend(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI) const;
};
} // namespace llvm
#endif
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