LLVM 17.0.0git
M68kCallingConv.h
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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-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
19
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 assigner
27struct M68kCCState : public CCState {
29
33 : CCState(CC, IsVarArg, MF, Locs, C), ArgTypeList(ArgTypes) {}
34};
35
36/// NOTE this function is used to select registers for formal arguments and call
37/// FIXME: Handling on pointer arguments is not complete
38inline 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 priority
47 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 llvm
76
77#endif // LLVM_LIB_TARGET_M68K_M68KCALLINGCONV_H
This file provides M68k specific target descriptions.
#define I(x, y, z)
Definition: MD5.cpp:58
unsigned Reg
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory),...
Definition: ArrayRef.h:41
CCState - This class holds information needed while lowering arguments and return values.
MCRegister AllocateReg(MCPhysReg Reg)
AllocateReg - Attempt to allocate one register.
void addLoc(const CCValAssign &V)
static CCValAssign getReg(unsigned ValNo, MVT ValVT, unsigned RegNo, MVT LocVT, LocInfo HTP, bool IsCustom=false)
This is an important class for using LLVM in a threaded context.
Definition: LLVMContext.h:67
Machine Value Type.
This class consists of common code factored out of the SmallVector class to reduce code duplication b...
Definition: SmallVector.h:577
@ C
The default llvm calling convention, compatible with C.
Definition: CallingConv.h:34
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
bool CC_M68k_Any_AssignToReg(unsigned &ValNo, MVT &ValVT, MVT &LocVT, CCValAssign::LocInfo &LocInfo, ISD::ArgFlagsTy &ArgFlags, CCState &State)
NOTE this function is used to select registers for formal arguments and call FIXME: Handling on point...
Custom state to propagate llvm type info to register CC assigner.
M68kCCState(ArrayRef< Type * > ArgTypes, CallingConv::ID CC, bool IsVarArg, MachineFunction &MF, SmallVectorImpl< CCValAssign > &Locs, LLVMContext &C)
ArrayRef< Type * > ArgTypeList