[Codegen] Alter the default promotion for saturating adds and subs
[llvm-complete.git] / lib / Target / RISCV / RISCVFrameLowering.h
blobdfc621c8bd070e93b7493e6842b8a85bfcb10424
1 //===-- RISCVFrameLowering.h - Define frame lowering for RISCV -*- C++ -*--===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This class implements RISCV-specific bits of TargetFrameLowering class.
11 //===----------------------------------------------------------------------===//
13 #ifndef LLVM_LIB_TARGET_RISCV_RISCVFRAMELOWERING_H
14 #define LLVM_LIB_TARGET_RISCV_RISCVFRAMELOWERING_H
16 #include "llvm/CodeGen/TargetFrameLowering.h"
18 namespace llvm {
19 class RISCVSubtarget;
21 class RISCVFrameLowering : public TargetFrameLowering {
22 public:
23 explicit RISCVFrameLowering(const RISCVSubtarget &STI)
24 : TargetFrameLowering(StackGrowsDown,
25 /*StackAlignment=*/16,
26 /*LocalAreaOffset=*/0),
27 STI(STI) {}
29 void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
30 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
32 int getFrameIndexReference(const MachineFunction &MF, int FI,
33 unsigned &FrameReg) const override;
35 void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
36 RegScavenger *RS) const override;
38 void processFunctionBeforeFrameFinalized(MachineFunction &MF,
39 RegScavenger *RS) const override;
41 bool hasFP(const MachineFunction &MF) const override;
43 bool hasReservedCallFrame(const MachineFunction &MF) const override;
44 MachineBasicBlock::iterator
45 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
46 MachineBasicBlock::iterator MI) const override;
48 // Get the first stack adjustment amount for SplitSPAdjust.
49 // Return 0 if we don't want to to split the SP adjustment in prologue and
50 // epilogue.
51 uint64_t getFirstSPAdjustAmount(const MachineFunction &MF) const;
53 protected:
54 const RISCVSubtarget &STI;
56 private:
57 void determineFrameLayout(MachineFunction &MF) const;
58 void adjustReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
59 const DebugLoc &DL, Register DestReg, Register SrcReg,
60 int64_t Val, MachineInstr::MIFlag Flag) const;
63 #endif