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//===-- M68kCallingConv.h - M68k Custom CC Routines -------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file contains the custom routines for the M68k Calling Convention
/// that aren't done by tablegen.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_M68K_M68KCALLINGCONV_H
#define LLVM_LIB_TARGET_M68K_M68KCALLINGCONV_H
#include "MCTargetDesc/M68kMCTargetDesc.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/Function.h"
namespace llvm {
/// Custom state to propagate llvm type info to register CC assigner
struct M68kCCState : public CCState {
ArrayRef<Type *> ArgTypeList;
M68kCCState(ArrayRef<Type *> ArgTypes, CallingConv::ID CC, bool IsVarArg,
MachineFunction &MF, SmallVectorImpl<CCValAssign> &Locs,
LLVMContext &C)
: CCState(CC, IsVarArg, MF, Locs, C), ArgTypeList(ArgTypes) {}
};
/// NOTE this function is used to select registers for formal arguments and call
/// FIXME: Handling on pointer arguments is not complete
inline bool CC_M68k_Any_AssignToReg(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
CCValAssign::LocInfo &LocInfo,
ISD::ArgFlagsTy &ArgFlags, CCState &State) {
const M68kCCState &CCInfo = static_cast<M68kCCState &>(State);
static const MCPhysReg DataRegList[] = {M68k::D0, M68k::D1, M68k::A0,
M68k::A1};
// Address registers have %a register priority
static const MCPhysReg AddrRegList[] = {
M68k::A0,
M68k::A1,
M68k::D0,
M68k::D1,
};
const auto &ArgTypes = CCInfo.ArgTypeList;
auto I = ArgTypes.begin(), End = ArgTypes.end();
int No = ValNo;
while (No > 0 && I != End) {
No -= (*I)->isIntegerTy(64) ? 2 : 1;
++I;
}
bool IsPtr = I != End && (*I)->isPointerTy();
unsigned Reg =
IsPtr ? State.AllocateReg(AddrRegList) : State.AllocateReg(DataRegList);
if (Reg) {
State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
return true;
}
return false;
}
} // namespace llvm
#endif // LLVM_LIB_TARGET_M68K_M68KCALLINGCONV_H
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