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//===-- MipsSubtarget.cpp - Mips Subtarget Information --------------------===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file implements the Mips specific subclass of TargetSubtargetInfo.
#include "MipsSubtarget.h"
#include "Mips.h"
#include "MipsMachineFunction.h"
#include "MipsRegisterInfo.h"
#include "MipsTargetMachine.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
#define DEBUG_TYPE "mips-subtarget"
#include ""
// FIXME: Maybe this should be on by default when Mips16 is specified
static cl::opt<bool>
Mixed16_32("mips-mixed-16-32", cl::init(false),
cl::desc("Allow for a mixture of Mips16 "
"and Mips32 code in a single output file"),
static cl::opt<bool> Mips_Os16("mips-os16", cl::init(false),
cl::desc("Compile all functions that don't use "
"floating point as Mips 16"),
static cl::opt<bool> Mips16HardFloat("mips16-hard-float", cl::NotHidden,
cl::desc("Enable mips16 hard float."),
static cl::opt<bool>
Mips16ConstantIslands("mips16-constant-islands", cl::NotHidden,
cl::desc("Enable mips16 constant islands."),
static cl::opt<bool>
GPOpt("mgpopt", cl::Hidden,
cl::desc("Enable gp-relative addressing of mips small data items"));
void MipsSubtarget::anchor() {}
MipsSubtarget::MipsSubtarget(const Triple &TT, StringRef CPU, StringRef FS,
bool little, const MipsTargetMachine &TM,
unsigned StackAlignOverride)
: MipsGenSubtargetInfo(TT, CPU, FS), MipsArchVersion(MipsDefault),
IsLittle(little), IsSoftFloat(false), IsSingleFloat(false), IsFPXX(false),
NoABICalls(false), IsFP64bit(false), UseOddSPReg(true),
IsNaN2008bit(false), IsGP64bit(false), HasVFPU(false), HasCnMips(false),
HasMips3_32(false), HasMips3_32r2(false), HasMips4_32(false),
HasMips4_32r2(false), HasMips5_32r2(false), InMips16Mode(false),
InMips16HardFloat(Mips16HardFloat), InMicroMipsMode(false), HasDSP(false),
HasDSPR2(false), HasDSPR3(false), AllowMixed16_32(Mixed16_32 | Mips_Os16),
Os16(Mips_Os16), HasMSA(false), UseTCCInDIV(false), HasSym32(false),
HasEVA(false), DisableMadd4(false), HasMT(false),
StackAlignOverride(StackAlignOverride), TM(TM), TargetTriple(TT),
TSInfo(), InstrInfo(MipsInstrInfo::create(
initializeSubtargetDependencies(CPU, FS, TM))),
TLInfo(MipsTargetLowering::create(TM, *this)) {
if (MipsArchVersion == MipsDefault)
MipsArchVersion = Mips32;
// Don't even attempt to generate code for MIPS-I and MIPS-V. They have not
// been tested and currently exist for the integrated assembler only.
if (MipsArchVersion == Mips1)
report_fatal_error("Code generation for MIPS-I is not implemented", false);
if (MipsArchVersion == Mips5)
report_fatal_error("Code generation for MIPS-V is not implemented", false);
// Check if Architecture and ABI are compatible.
assert(((!isGP64bit() && isABI_O32()) ||
(isGP64bit() && (isABI_N32() || isABI_N64()))) &&
"Invalid Arch & ABI pair.");
if (hasMSA() && !isFP64bit())
report_fatal_error("MSA requires a 64-bit FPU register file (FR=1 mode). "
"See -mattr=+fp64.",
if (!isABI_O32() && !useOddSPReg())
report_fatal_error("-mattr=+nooddspreg requires the O32 ABI.", false);
if (IsFPXX && (isABI_N32() || isABI_N64()))
report_fatal_error("FPXX is not permitted for the N32/N64 ABI's.", false);
if (hasMips32r6()) {
StringRef ISA = hasMips64r6() ? "MIPS64r6" : "MIPS32r6";
if (hasDSP())
report_fatal_error(ISA + " is not compatible with the DSP ASE", false);
if (NoABICalls && TM.isPositionIndependent())
report_fatal_error("position-independent code requires '-mabicalls'");
if (isABI_N64() && !TM.isPositionIndependent() && !hasSym32())
NoABICalls = true;
// Set UseSmallSection.
UseSmallSection = GPOpt;
if (!NoABICalls && GPOpt) {
errs() << "warning: cannot use small-data accesses for '-mabicalls'"
<< "\n";
UseSmallSection = false;
bool MipsSubtarget::isPositionIndependent() const {
return TM.isPositionIndependent();
/// This overrides the PostRAScheduler bit in the SchedModel for any CPU.
bool MipsSubtarget::enablePostRAScheduler() const { return true; }
void MipsSubtarget::getCriticalPathRCs(RegClassVector &CriticalPathRCs) const {
CriticalPathRCs.push_back(isGP64bit() ? &Mips::GPR64RegClass
: &Mips::GPR32RegClass);
CodeGenOpt::Level MipsSubtarget::getOptLevelToEnablePostRAScheduler() const {
return CodeGenOpt::Aggressive;
MipsSubtarget &
MipsSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS,
const TargetMachine &TM) {
std::string CPUName = MIPS_MC::selectMipsCPU(TM.getTargetTriple(), CPU);
// Parse features string.
ParseSubtargetFeatures(CPUName, FS);
// Initialize scheduling itinerary for the specified CPU.
InstrItins = getInstrItineraryForCPU(CPUName);
if (InMips16Mode && !IsSoftFloat)
InMips16HardFloat = true;
if (StackAlignOverride)
stackAlignment = StackAlignOverride;
else if (isABI_N32() || isABI_N64())
stackAlignment = 16;
else {
assert(isABI_O32() && "Unknown ABI for stack alignment!");
stackAlignment = 8;
return *this;
bool MipsSubtarget::useConstantIslands() {
DEBUG(dbgs() << "use constant islands " << Mips16ConstantIslands << "\n");
return Mips16ConstantIslands;
Reloc::Model MipsSubtarget::getRelocationModel() const {
return TM.getRelocationModel();
bool MipsSubtarget::isABI_N64() const { return getABI().IsN64(); }
bool MipsSubtarget::isABI_N32() const { return getABI().IsN32(); }
bool MipsSubtarget::isABI_O32() const { return getABI().IsO32(); }
const MipsABIInfo &MipsSubtarget::getABI() const { return TM.getABI(); }