1//=- LoongArchBaseInfo.h - Top level definitions for LoongArch MC -*- 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// This file contains small standalone enum definitions and helper function
10// definitions for the LoongArch target useful for the compiler back-end and the
11// MC libraries.
12//
13//===----------------------------------------------------------------------===//
14#ifndef LLVM_LIB_TARGET_LOONGARCH_MCTARGETDESC_LOONGARCHBASEINFO_H
15#define LLVM_LIB_TARGET_LOONGARCH_MCTARGETDESC_LOONGARCHBASEINFO_H
16
17#include "MCTargetDesc/LoongArchMCTargetDesc.h"
18#include "llvm/ADT/StringRef.h"
19#include "llvm/ADT/StringSwitch.h"
20#include "llvm/CodeGen/MachineOperand.h"
21#include "llvm/MC/MCInstrDesc.h"
22#include "llvm/TargetParser/SubtargetFeature.h"
23
24namespace llvm {
25
26// This namespace holds all of the target specific flags that instruction info
27// tracks.
28namespace LoongArchII {
29enum {
30 MO_None,
31 MO_CALL,
32 MO_CALL_PLT,
33 MO_PCREL_HI,
34 MO_PCREL_LO,
35 MO_PCREL64_LO,
36 MO_PCREL64_HI,
37 MO_GOT_PC_HI,
38 MO_GOT_PC_LO,
39 MO_GOT_PC64_LO,
40 MO_GOT_PC64_HI,
41 MO_LE_HI,
42 MO_LE_LO,
43 MO_LE64_LO,
44 MO_LE64_HI,
45 MO_IE_PC_HI,
46 MO_IE_PC_LO,
47 MO_IE_PC64_LO,
48 MO_IE_PC64_HI,
49 MO_LD_PC_HI,
50 MO_GD_PC_HI,
51 MO_CALL36,
52 MO_DESC_PC_HI,
53 MO_DESC_PC_LO,
54 MO_DESC64_PC_HI,
55 MO_DESC64_PC_LO,
56 MO_DESC_LD,
57 MO_DESC_CALL,
58 MO_LE_HI_R,
59 MO_LE_ADD_R,
60 MO_LE_LO_R,
61 // TODO: Add more flags.
62
63 // Used to differentiate between target-specific "direct" flags and "bitmask"
64 // flags. A machine operand can only have one "direct" flag, but can have
65 // multiple "bitmask" flags.
66 MO_DIRECT_FLAG_MASK = 0x3f,
67
68 MO_RELAX = 0x40
69};
70
71// Given a MachineOperand that may carry out "bitmask" flags, such as MO_RELAX,
72// return LoongArch target-specific "direct" flags.
73static inline unsigned getDirectFlags(const MachineOperand &MO) {
74 return MO.getTargetFlags() & MO_DIRECT_FLAG_MASK;
75}
76
77// Add MO_RELAX "bitmask" flag when FeatureRelax is enabled.
78static inline unsigned encodeFlags(unsigned Flags, bool Relax) {
79 return Flags | (Relax ? MO_RELAX : 0);
80}
81
82// \returns true if the given MachineOperand has MO_RELAX "bitmask" flag.
83static inline bool hasRelaxFlag(const MachineOperand &MO) {
84 return MO.getTargetFlags() & MO_RELAX;
85}
86
87// Target-specific flags of LAInst.
88// All definitions must match LoongArchInstrFormats.td.
89enum {
90 // Whether the instruction's rd is normally required to differ from rj and
91 // rk, in the way the 3-register atomic memory operations behave
92 // (Section 2.2.7.1 and 2.2.7.2, LoongArch Reference Manual Volume 1 v1.10;
93 // while Section 2.2.7.3 lacked similar description for the AMCAS
94 // instructions, at least the INE exception is still signaled on Loongson
95 // 3A6000 when its rd == rj).
96 //
97 // Used for generating diagnostics for assembler input that violate the
98 // constraint. As described on the manual, the covered instructions require
99 // rd != rj && rd != rk to work as intended.
100 IsSubjectToAMORdConstraintShift = 0,
101 IsSubjectToAMORdConstraintMask = 1 << IsSubjectToAMORdConstraintShift,
102
103 // Whether the instruction belongs to the AMCAS family.
104 IsAMCASShift = IsSubjectToAMORdConstraintShift + 1,
105 IsAMCASMask = 1 << IsAMCASShift,
106};
107
108/// \returns true if this instruction's rd is normally required to differ
109/// from rj and rk, in the way 3-register atomic memory operations behave.
110static inline bool isSubjectToAMORdConstraint(uint64_t TSFlags) {
111 return TSFlags & IsSubjectToAMORdConstraintMask;
112}
113
114/// \returns true if this instruction belongs to the AMCAS family.
115static inline bool isAMCAS(uint64_t TSFlags) { return TSFlags & IsAMCASMask; }
116} // end namespace LoongArchII
117
118namespace LoongArchABI {
119enum ABI {
120 ABI_ILP32S,
121 ABI_ILP32F,
122 ABI_ILP32D,
123 ABI_LP64S,
124 ABI_LP64F,
125 ABI_LP64D,
126 ABI_Unknown
127};
128
129ABI computeTargetABI(const Triple &TT, const FeatureBitset &FeatureBits,
130 StringRef ABIName);
131ABI getTargetABI(StringRef ABIName);
132
133// Returns the register used to hold the stack pointer after realignment.
134MCRegister getBPReg();
135} // end namespace LoongArchABI
136
137} // end namespace llvm
138
139#endif // LLVM_LIB_TARGET_LOONGARCH_MCTARGETDESC_LOONGARCHBASEINFO_H
140