1 //===- lib/Target/AMDGPU/AMDGPUCallLowering.h - 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 describes how to lower LLVM calls to machine code calls.
11 ///
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_LIB_TARGET_AMDGPU_AMDGPUCALLLOWERING_H
15 #define LLVM_LIB_TARGET_AMDGPU_AMDGPUCALLLOWERING_H
16 
17 #include "AMDGPU.h"
18 #include "llvm/CodeGen/GlobalISel/CallLowering.h"
19 
20 namespace llvm {
21 
22 class AMDGPUTargetLowering;
23 class MachineInstrBuilder;
24 
25 class AMDGPUCallLowering: public CallLowering {
26   Register lowerParameterPtr(MachineIRBuilder &MIRBuilder, Type *ParamTy,
27                              uint64_t Offset) const;
28 
29   void lowerParameter(MachineIRBuilder &MIRBuilder, Type *ParamTy,
30                       uint64_t Offset, unsigned Align,
31                       Register DstReg) const;
32 
33   /// A function of this type is used to perform value split action.
34   using SplitArgTy = std::function<void(ArrayRef<Register>, LLT, LLT, int)>;
35 
36   void splitToValueTypes(const ArgInfo &OrigArgInfo,
37                          SmallVectorImpl<ArgInfo> &SplitArgs,
38                          const DataLayout &DL, MachineRegisterInfo &MRI,
39                          CallingConv::ID CallConv,
40                          SplitArgTy SplitArg) const;
41 
42   bool lowerReturnVal(MachineIRBuilder &MIRBuilder,
43                       const Value *Val, ArrayRef<Register> VRegs,
44                       MachineInstrBuilder &Ret) const;
45 
46 public:
47   AMDGPUCallLowering(const AMDGPUTargetLowering &TLI);
48 
49   bool lowerReturn(MachineIRBuilder &MIRBuilder, const Value *Val,
50                    ArrayRef<Register> VRegs) const override;
51 
52   bool lowerFormalArgumentsKernel(MachineIRBuilder &MIRBuilder,
53                                   const Function &F,
54                                   ArrayRef<ArrayRef<Register>> VRegs) const;
55 
56   bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
57                             ArrayRef<ArrayRef<Register>> VRegs) const override;
58   static CCAssignFn *CCAssignFnForCall(CallingConv::ID CC, bool IsVarArg);
59   static CCAssignFn *CCAssignFnForReturn(CallingConv::ID CC, bool IsVarArg);
60 };
61 } // End of namespace llvm;
62 #endif
63