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