1 //===-- RISCVCallLowering.cpp - Call lowering -------------------*- 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 /// \file
10 /// This file implements the lowering of LLVM calls to machine code calls for
11 /// GlobalISel.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "RISCVCallLowering.h"
16 #include "RISCVISelLowering.h"
17 #include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
18 
19 using namespace llvm;
20 
21 RISCVCallLowering::RISCVCallLowering(const RISCVTargetLowering &TLI)
22     : CallLowering(&TLI) {}
23 
24 bool RISCVCallLowering::lowerReturn(MachineIRBuilder &MIRBuilder,
25                                     const Value *Val,
26                                     ArrayRef<Register> VRegs) const {
27 
28   MachineInstrBuilder Ret = MIRBuilder.buildInstrNoInsert(RISCV::PseudoRET);
29 
30   if (Val != nullptr) {
31     return false;
32   }
33   MIRBuilder.insertInstr(Ret);
34   return true;
35 }
36 
37 bool RISCVCallLowering::lowerFormalArguments(
38     MachineIRBuilder &MIRBuilder, const Function &F,
39     ArrayRef<ArrayRef<Register>> VRegs) const {
40 
41   if (F.arg_empty())
42     return true;
43 
44   return false;
45 }
46 
47 bool RISCVCallLowering::lowerCall(MachineIRBuilder &MIRBuilder,
48                                   CallLoweringInfo &Info) const {
49   return false;
50 }
51