1 //===-- M68kCallingConv.h - M68k Custom CC Routines -------------*- 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 contains the custom routines for the M68k Calling Convention 11 /// that aren't done by tablegen. 12 /// 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_LIB_TARGET_M68K_M68KCALLINGCONV_H 16 #define LLVM_LIB_TARGET_M68K_M68KCALLINGCONV_H 17 18 #include "MCTargetDesc/M68kMCTargetDesc.h" 19 20 #include "llvm/CodeGen/CallingConvLower.h" 21 #include "llvm/IR/CallingConv.h" 22 #include "llvm/IR/Function.h" 23 24 namespace llvm { 25 26 /// Custom state to propagate llvm type info to register CC assigner 27 struct M68kCCState : public CCState { 28 ArrayRef<Type *> ArgTypeList; 29 30 M68kCCState(ArrayRef<Type *> ArgTypes, CallingConv::ID CC, bool IsVarArg, 31 MachineFunction &MF, SmallVectorImpl<CCValAssign> &Locs, 32 LLVMContext &C) 33 : CCState(CC, IsVarArg, MF, Locs, C), ArgTypeList(ArgTypes) {} 34 }; 35 36 /// NOTE this function is used to select registers for formal arguments and call 37 /// FIXME: Handling on pointer arguments is not complete 38 inline bool CC_M68k_Any_AssignToReg(unsigned &ValNo, MVT &ValVT, MVT &LocVT, 39 CCValAssign::LocInfo &LocInfo, 40 ISD::ArgFlagsTy &ArgFlags, CCState &State) { 41 const M68kCCState &CCInfo = static_cast<M68kCCState &>(State); 42 43 static const MCPhysReg DataRegList[] = {M68k::D0, M68k::D1, M68k::A0, 44 M68k::A1}; 45 46 // Address registers have %a register priority 47 static const MCPhysReg AddrRegList[] = { 48 M68k::A0, 49 M68k::A1, 50 M68k::D0, 51 M68k::D1, 52 }; 53 54 const auto &ArgTypes = CCInfo.ArgTypeList; 55 auto I = ArgTypes.begin(), End = ArgTypes.end(); 56 int No = ValNo; 57 while (No > 0 && I != End) { 58 No -= (*I)->isIntegerTy(64) ? 2 : 1; 59 ++I; 60 } 61 62 bool IsPtr = I != End && (*I)->isPointerTy(); 63 64 unsigned Reg = 65 IsPtr ? State.AllocateReg(AddrRegList) : State.AllocateReg(DataRegList); 66 67 if (Reg) { 68 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo)); 69 return true; 70 } 71 72 return false; 73 } 74 75 } // namespace llvm 76 77 #endif // LLVM_LIB_TARGET_M68K_M68KCALLINGCONV_H 78