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
M68kCCState(const llvm::Function & F,CallingConv::ID CC,bool IsVarArg,MachineFunction & MF,SmallVectorImpl<CCValAssign> & Locs,LLVMContext & C)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
CC_M68k_Any_AssignToReg(unsigned & ValNo,MVT & ValVT,MVT & LocVT,CCValAssign::LocInfo & LocInfo,ISD::ArgFlagsTy & ArgFlags,CCState & State)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