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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-exception6//7//===----------------------------------------------------------------------===//8///9/// \file10/// This file contains the custom routines for the M68k Calling Convention11/// that aren't done by tablegen.12///13//===----------------------------------------------------------------------===//14 15#ifndef LLVM_LIB_TARGET_M68K_M68KCALLINGCONV_H16#define LLVM_LIB_TARGET_M68K_M68KCALLINGCONV_H17 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 24namespace llvm {25 26/// Custom state to propagate llvm type info to register CC assigner27struct 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 call37/// FIXME: Handling on pointer arguments is not complete38inline 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 priority47 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 llvm76 77#endif // LLVM_LIB_TARGET_M68K_M68KCALLINGCONV_H78