lib/Target/RISCV/RISCVCallLowering.cpp

   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 }