1 //===-- MipsSubtarget.cpp - Mips Subtarget Information --------------------===//
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 implements the Mips specific subclass of TargetSubtargetInfo.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "mips-subtarget"
16 #include "MipsMachineFunction.h"
18 #include "MipsRegisterInfo.h"
19 #include "MipsSubtarget.h"
20 #include "MipsTargetMachine.h"
21 #include "llvm/IR/Attributes.h"
22 #include "llvm/IR/Function.h"
23 #include "llvm/Support/CommandLine.h"
24 #include "llvm/Support/Debug.h"
25 #include "llvm/Support/TargetRegistry.h"
26 #include "llvm/Support/raw_ostream.h"
28 #define GET_SUBTARGETINFO_TARGET_DESC
29 #define GET_SUBTARGETINFO_CTOR
30 #include "MipsGenSubtargetInfo.inc"
35 // FIXME: Maybe this should be on by default when Mips16 is specified
37 static cl::opt<bool> Mixed16_32(
40 cl::desc("Allow for a mixture of Mips16 "
41 "and Mips32 code in a single source file"),
44 static cl::opt<bool> Mips_Os16(
47 cl::desc("Compile all functions that don' use "
48 "floating point as Mips 16"),
52 Mips16HardFloat("mips16-hard-float", cl::NotHidden,
53 cl::desc("MIPS: mips16 hard float enable."),
57 Mips16ConstantIslands(
58 "mips16-constant-islands", cl::NotHidden,
59 cl::desc("MIPS: mips16 constant islands enable."),
62 void MipsSubtarget::anchor() { }
64 MipsSubtarget::MipsSubtarget(const std::string &TT, const std::string &CPU,
65 const std::string &FS, bool little,
66 Reloc::Model _RM, MipsTargetMachine *_TM) :
67 MipsGenSubtargetInfo(TT, CPU, FS),
68 MipsArchVersion(Mips32), MipsABI(UnknownABI), IsLittle(little),
69 IsSingleFloat(false), IsFP64bit(false), IsGP64bit(false), HasVFPU(false),
70 IsLinux(true), HasSEInReg(false), HasCondMov(false), HasSwap(false),
71 HasBitCount(false), HasFPIdx(false),
72 InMips16Mode(false), InMips16HardFloat(Mips16HardFloat),
73 InMicroMipsMode(false), HasDSP(false), HasDSPR2(false),
74 AllowMixed16_32(Mixed16_32 | Mips_Os16), Os16(Mips_Os16), HasMSA(false),
75 RM(_RM), OverrideMode(NoOverride), TM(_TM)
77 std::string CPUName = CPU;
81 // Parse features string.
82 ParseSubtargetFeatures(CPUName, FS);
84 if (InMips16Mode && !TM->Options.UseSoftFloat) {
85 // Hard float for mips16 means essentially to compile as soft float
86 // but to use a runtime library for soft float that is written with
87 // native mips32 floating point instructions (those runtime routines
88 // run in mips32 hard float mode).
89 TM->Options.UseSoftFloat = true;
90 TM->Options.FloatABIType = FloatABI::Soft;
91 InMips16HardFloat = true;
94 PreviousInMips16Mode = InMips16Mode;
96 // Initialize scheduling itinerary for the specified CPU.
97 InstrItins = getInstrItineraryForCPU(CPUName);
99 // Set MipsABI if it hasn't been set yet.
100 if (MipsABI == UnknownABI)
101 MipsABI = hasMips64() ? N64 : O32;
103 // Check if Architecture and ABI are compatible.
104 assert(((!hasMips64() && (isABI_O32() || isABI_EABI())) ||
105 (hasMips64() && (isABI_N32() || isABI_N64()))) &&
106 "Invalid Arch & ABI pair.");
108 if (hasMSA() && !isFP64bit())
109 report_fatal_error("MSA requires a 64-bit FPU register file (FR=1 mode). "
113 // Is the target system Linux ?
114 if (TT.find("linux") == std::string::npos)
117 // Set UseSmallSection.
118 UseSmallSection = !IsLinux && (RM == Reloc::Static);
119 // set some subtarget specific features
125 MipsSubtarget::enablePostRAScheduler(CodeGenOpt::Level OptLevel,
126 TargetSubtargetInfo::AntiDepBreakMode &Mode,
127 RegClassVector &CriticalPathRCs) const {
128 Mode = TargetSubtargetInfo::ANTIDEP_NONE;
129 CriticalPathRCs.clear();
130 CriticalPathRCs.push_back(hasMips64() ?
131 &Mips::GPR64RegClass : &Mips::GPR32RegClass);
132 return OptLevel >= CodeGenOpt::Aggressive;
135 //FIXME: This logic for reseting the subtarget along with
136 // the helper classes can probably be simplified but there are a lot of
137 // cases so we will defer rewriting this to later.
139 void MipsSubtarget::resetSubtarget(MachineFunction *MF) {
140 bool ChangeToMips16 = false, ChangeToNoMips16 = false;
141 DEBUG(dbgs() << "resetSubtargetFeatures" << "\n");
142 AttributeSet FnAttrs = MF->getFunction()->getAttributes();
143 ChangeToMips16 = FnAttrs.hasAttribute(AttributeSet::FunctionIndex,
145 ChangeToNoMips16 = FnAttrs.hasAttribute(AttributeSet::FunctionIndex,
147 assert (!(ChangeToMips16 & ChangeToNoMips16) &&
148 "mips16 and nomips16 specified on the same function");
149 if (ChangeToMips16) {
150 if (PreviousInMips16Mode)
152 OverrideMode = Mips16Override;
153 PreviousInMips16Mode = true;
154 TM->setHelperClassesMips16();
156 } else if (ChangeToNoMips16) {
157 if (!PreviousInMips16Mode)
159 OverrideMode = NoMips16Override;
160 PreviousInMips16Mode = false;
161 TM->setHelperClassesMipsSE();
164 if (OverrideMode == NoOverride)
166 OverrideMode = NoOverride;
167 DEBUG(dbgs() << "back to default" << "\n");
168 if (inMips16Mode() && !PreviousInMips16Mode) {
169 TM->setHelperClassesMips16();
170 PreviousInMips16Mode = true;
171 } else if (!inMips16Mode() && PreviousInMips16Mode) {
172 TM->setHelperClassesMipsSE();
173 PreviousInMips16Mode = false;
179 bool MipsSubtarget::mipsSEUsesSoftFloat() const {
180 return TM->Options.UseSoftFloat && !InMips16HardFloat;
183 bool MipsSubtarget::useConstantIslands() {
184 DEBUG(dbgs() << "use constant islands " << Mips16ConstantIslands << "\n");
185 return Mips16ConstantIslands;