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 class M68kCCState : public CCState { 28 public: 29 const llvm::Function &F; 30 31 M68kCCState(const llvm::Function &F, CallingConv::ID CC, bool IsVarArg, 32 MachineFunction &MF, SmallVectorImpl<CCValAssign> &Locs, 33 LLVMContext &C) 34 : CCState(CC, IsVarArg, MF, Locs, C), F(F) {} 35 }; 36 37 /// NOTE this function is used to select registers for formal arguments and call 38 /// FIXME: Handling on pointer arguments is not complete 39 inline bool CC_M68k_Any_AssignToReg(unsigned &ValNo, MVT &ValVT, MVT &LocVT, 40 CCValAssign::LocInfo &LocInfo, 41 ISD::ArgFlagsTy &ArgFlags, CCState &State) { 42 M68kCCState CCInfo = static_cast<M68kCCState &>(State); 43 44 static const MCPhysReg DataRegList[] = {M68k::D0, M68k::D1, M68k::A0, 45 M68k::A1}; 46 47 // Address registers have %a register priority 48 static const MCPhysReg AddrRegList[] = { 49 M68k::A0, 50 M68k::A1, 51 M68k::D0, 52 M68k::D1, 53 }; 54 55 auto I = CCInfo.F.arg_begin(); 56 int No = ValNo; 57 while (No > 0) { 58 No -= I->getType()->isIntegerTy(64) ? 2 : 1; 59 I++; 60 } 61 62 bool IsPtr = I != CCInfo.F.arg_end() && I->getType()->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 78