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 &B, Type *ParamTy,
27                              uint64_t Offset) const;
28 
29   void lowerParameter(MachineIRBuilder &B, Type *ParamTy, uint64_t Offset,
30                       unsigned Align, Register DstReg) const;
31 
32   /// A function of this type is used to perform value split action.
33   using SplitArgTy = std::function<void(ArrayRef<Register>, LLT, LLT, int)>;
34 
35   void splitToValueTypes(const ArgInfo &OrigArgInfo,
36                          SmallVectorImpl<ArgInfo> &SplitArgs,
37                          const DataLayout &DL, MachineRegisterInfo &MRI,
38                          CallingConv::ID CallConv,
39                          SplitArgTy SplitArg) const;
40 
41   bool lowerReturnVal(MachineIRBuilder &B, const Value *Val,
42                       ArrayRef<Register> VRegs, MachineInstrBuilder &Ret) const;
43 
44 public:
45   AMDGPUCallLowering(const AMDGPUTargetLowering &TLI);
46 
47   bool lowerReturn(MachineIRBuilder &B, const Value *Val,
48                    ArrayRef<Register> VRegs) const override;
49 
50   bool lowerFormalArgumentsKernel(MachineIRBuilder &B, const Function &F,
51                                   ArrayRef<ArrayRef<Register>> VRegs) const;
52 
53   bool lowerFormalArguments(MachineIRBuilder &B, const Function &F,
54                             ArrayRef<ArrayRef<Register>> VRegs) const override;
55   static CCAssignFn *CCAssignFnForCall(CallingConv::ID CC, bool IsVarArg);
56   static CCAssignFn *CCAssignFnForReturn(CallingConv::ID CC, bool IsVarArg);
57 };
58 } // End of namespace llvm;
59 #endif
60