1 //===-- MipsSubtarget.h - Define Subtarget for the Mips ---------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the Mips specific subclass of TargetSubtargetInfo.
12 //===----------------------------------------------------------------------===//
14 #ifndef MIPSSUBTARGET_H
15 #define MIPSSUBTARGET_H
17 #include "llvm/MC/MCInstrItineraries.h"
18 #include "llvm/Support/ErrorHandling.h"
19 #include "llvm/Target/TargetSubtargetInfo.h"
22 #define GET_SUBTARGETINFO_HEADER
23 #include "MipsGenSubtargetInfo.inc"
28 class MipsTargetMachine;
30 class MipsSubtarget : public MipsGenSubtargetInfo {
31 virtual void anchor();
34 // NOTE: O64 will not be supported.
36 UnknownABI, O32, N32, N64, EABI
40 enum MipsArchEnum { Mips32, Mips32r2, Mips4, Mips64, Mips64r2 };
42 // Mips architecture version
43 MipsArchEnum MipsArchVersion;
45 // Mips supported ABIs
48 // IsLittle - The target is Little Endian
51 // IsSingleFloat - The target only supports single precision float
52 // point operations. This enable the target to use all 32 32-bit
53 // floating point registers instead of only using even ones.
56 // IsFP64bit - The target processor has 64-bit floating point registers.
59 // IsFP64bit - General-purpose registers are 64 bits wide
62 // HasVFPU - Processor has a vector floating point unit.
65 // CPU supports cnMIPS (Cavium Networks Octeon CPU).
68 // isLinux - Target system is Linux. Is false we consider ELFOS for now.
71 // UseSmallSection - Small section is used.
74 /// Features related to the presence of specific instructions.
76 // HasSEInReg - SEB and SEH (signext in register) instructions.
79 // HasCondMov - Conditional mov (MOVZ, MOVN) instructions.
82 // HasSwap - Byte and half swap instructions.
85 // HasBitCount - Count leading '1' and '0' bits.
88 // HasFPIdx -- Floating point indexed load/store instructions.
91 // InMips16 -- can process Mips16 instructions
95 bool InMips16HardFloat;
97 // PreviousInMips16 -- the function we just processed was in Mips 16 Mode
98 bool PreviousInMips16Mode;
100 // InMicroMips -- can process MicroMips instructions
101 bool InMicroMipsMode;
103 // HasDSP, HasDSPR2 -- supports DSP ASE.
104 bool HasDSP, HasDSPR2;
106 // Allow mixed Mips16 and Mips32 in one source file
107 bool AllowMixed16_32;
109 // Optimize for space by compiling all functions as Mips 16 unless
110 // it needs floating point. Functions needing floating point are
111 // compiled as Mips32
114 // HasMSA -- supports MSA ASE.
117 InstrItineraryData InstrItins;
122 // We can override the determination of whether we are in mips16 mode
123 // as from the command line
124 enum {NoOverride, Mips16Override, NoMips16Override} OverrideMode;
126 MipsTargetMachine *TM;
130 virtual bool enablePostRAScheduler(CodeGenOpt::Level OptLevel,
131 AntiDepBreakMode& Mode,
132 RegClassVector& CriticalPathRCs) const;
134 /// Only O32 and EABI supported right now.
135 bool isABI_EABI() const { return MipsABI == EABI; }
136 bool isABI_N64() const { return MipsABI == N64; }
137 bool isABI_N32() const { return MipsABI == N32; }
138 bool isABI_O32() const { return MipsABI == O32; }
139 unsigned getTargetABI() const { return MipsABI; }
141 /// This constructor initializes the data members to match that
142 /// of the specified triple.
143 MipsSubtarget(const std::string &TT, const std::string &CPU,
144 const std::string &FS, bool little, Reloc::Model RM,
145 MipsTargetMachine *TM);
147 /// ParseSubtargetFeatures - Parses features string setting specified
148 /// subtarget options. Definition of function is auto generated by tblgen.
149 void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
151 bool hasMips32() const { return MipsArchVersion >= Mips32; }
152 bool hasMips32r2() const { return MipsArchVersion == Mips32r2 ||
153 MipsArchVersion == Mips64r2; }
154 bool hasMips64() const { return MipsArchVersion >= Mips64; }
155 bool hasMips64r2() const { return MipsArchVersion == Mips64r2; }
157 bool hasCnMips() const { return HasCnMips; }
159 bool isLittle() const { return IsLittle; }
160 bool isFP64bit() const { return IsFP64bit; }
161 bool isNotFP64bit() const { return !IsFP64bit; }
162 bool isGP64bit() const { return IsGP64bit; }
163 bool isGP32bit() const { return !IsGP64bit; }
164 bool isSingleFloat() const { return IsSingleFloat; }
165 bool isNotSingleFloat() const { return !IsSingleFloat; }
166 bool hasVFPU() const { return HasVFPU; }
167 bool inMips16Mode() const {
168 switch (OverrideMode) {
173 case NoMips16Override:
176 llvm_unreachable("Unexpected mode");
178 bool inMips16ModeDefault() const {
181 bool inMips16HardFloat() const {
182 return inMips16Mode() && InMips16HardFloat;
184 bool inMicroMipsMode() const { return InMicroMipsMode; }
185 bool hasDSP() const { return HasDSP; }
186 bool hasDSPR2() const { return HasDSPR2; }
187 bool hasMSA() const { return HasMSA; }
188 bool isLinux() const { return IsLinux; }
189 bool useSmallSection() const { return UseSmallSection; }
191 bool hasStandardEncoding() const { return !inMips16Mode(); }
193 bool mipsSEUsesSoftFloat() const;
195 bool enableLongBranchPass() const {
196 return hasStandardEncoding() || allowMixed16_32();
199 /// Features related to the presence of specific instructions.
200 bool hasSEInReg() const { return HasSEInReg; }
201 bool hasCondMov() const { return HasCondMov; }
202 bool hasSwap() const { return HasSwap; }
203 bool hasBitCount() const { return HasBitCount; }
204 bool hasFPIdx() const { return HasFPIdx; }
205 bool hasExtractInsert() const { return !inMips16Mode() && hasMips32r2(); }
207 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
208 bool allowMixed16_32() const { return inMips16ModeDefault() |
211 bool os16() const { return Os16;};
213 bool isTargetNaCl() const { return TargetTriple.isOSNaCl(); }
214 bool isNotTargetNaCl() const { return !TargetTriple.isOSNaCl(); }
216 // for now constant islands are on for the whole compilation unit but we only
217 // really use them if in addition we are in mips16 mode
218 static bool useConstantIslands();
220 unsigned stackAlignment() const { return hasMips64() ? 16 : 8; }
222 // Grab relocation model
223 Reloc::Model getRelocationModel() const {return RM;}
225 /// \brief Reset the subtarget for the Mips target.
226 void resetSubtarget(MachineFunction *MF);
230 } // End llvm namespace