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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.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "mips-subtarget"
#include "MipsMachineFunction.h"
#include "MipsSubtarget.h"
#include "MipsTargetMachine.h"
#include "Mips.h"
#include "MipsRegisterInfo.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"
#define GET_SUBTARGETINFO_TARGET_DESC
#define GET_SUBTARGETINFO_CTOR
#include "MipsGenSubtargetInfo.inc"
using namespace llvm;
// 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 source file"),
cl::Hidden);
static cl::opt<bool> Mips_Os16(
"mips-os16",
cl::init(false),
cl::desc("Compile all functions that don' use "
"floating point as Mips 16"),
cl::Hidden);
static cl::opt<bool>
Mips16HardFloat("mips16-hard-float", cl::NotHidden,
cl::desc("MIPS: mips16 hard float enable."),
cl::init(false));
static cl::opt<bool>
Mips16ConstantIslands(
"mips16-constant-islands", cl::Hidden,
cl::desc("MIPS: mips16 constant islands enable. experimental feature"),
cl::init(false));
void MipsSubtarget::anchor() { }
MipsSubtarget::MipsSubtarget(const std::string &TT, const std::string &CPU,
const std::string &FS, bool little,
Reloc::Model _RM, MipsTargetMachine *_TM) :
MipsGenSubtargetInfo(TT, CPU, FS),
MipsArchVersion(Mips32), MipsABI(UnknownABI), IsLittle(little),
IsSingleFloat(false), IsFP64bit(false), IsGP64bit(false), HasVFPU(false),
IsLinux(true), HasSEInReg(false), HasCondMov(false), HasSwap(false),
HasBitCount(false), HasFPIdx(false),
InMips16Mode(false), InMips16HardFloat(Mips16HardFloat),
InMicroMipsMode(false), HasDSP(false), HasDSPR2(false),
AllowMixed16_32(Mixed16_32 | Mips_Os16), Os16(Mips_Os16), HasMSA(false),
RM(_RM), OverrideMode(NoOverride), TM(_TM)
{
std::string CPUName = CPU;
if (CPUName.empty())
CPUName = "mips32";
// Parse features string.
ParseSubtargetFeatures(CPUName, FS);
PreviousInMips16Mode = InMips16Mode;
// Initialize scheduling itinerary for the specified CPU.
InstrItins = getInstrItineraryForCPU(CPUName);
// Set MipsABI if it hasn't been set yet.
if (MipsABI == UnknownABI)
MipsABI = hasMips64() ? N64 : O32;
// Check if Architecture and ABI are compatible.
assert(((!hasMips64() && (isABI_O32() || isABI_EABI())) ||
(hasMips64() && (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.",
false);
// Is the target system Linux ?
if (TT.find("linux") == std::string::npos)
IsLinux = false;
// Set UseSmallSection.
UseSmallSection = !IsLinux && (RM == Reloc::Static);
// set some subtarget specific features
if (inMips16Mode())
HasBitCount=false;
}
bool
MipsSubtarget::enablePostRAScheduler(CodeGenOpt::Level OptLevel,
TargetSubtargetInfo::AntiDepBreakMode &Mode,
RegClassVector &CriticalPathRCs) const {
Mode = TargetSubtargetInfo::ANTIDEP_NONE;
CriticalPathRCs.clear();
CriticalPathRCs.push_back(hasMips64() ?
&Mips::GPR64RegClass : &Mips::GPR32RegClass);
return OptLevel >= CodeGenOpt::Aggressive;
}
//FIXME: This logic for reseting the subtarget along with
// the helper classes can probably be simplified but there are a lot of
// cases so we will defer rewriting this to later.
//
void MipsSubtarget::resetSubtarget(MachineFunction *MF) {
bool ChangeToMips16 = false, ChangeToNoMips16 = false;
DEBUG(dbgs() << "resetSubtargetFeatures" << "\n");
AttributeSet FnAttrs = MF->getFunction()->getAttributes();
ChangeToMips16 = FnAttrs.hasAttribute(AttributeSet::FunctionIndex,
"mips16");
ChangeToNoMips16 = FnAttrs.hasAttribute(AttributeSet::FunctionIndex,
"nomips16");
assert (!(ChangeToMips16 & ChangeToNoMips16) &&
"mips16 and nomips16 specified on the same function");
if (ChangeToMips16) {
if (PreviousInMips16Mode)
return;
OverrideMode = Mips16Override;
PreviousInMips16Mode = true;
TM->setHelperClassesMips16();
return;
} else if (ChangeToNoMips16) {
if (!PreviousInMips16Mode)
return;
OverrideMode = NoMips16Override;
PreviousInMips16Mode = false;
TM->setHelperClassesMipsSE();
return;
} else {
if (OverrideMode == NoOverride)
return;
OverrideMode = NoOverride;
DEBUG(dbgs() << "back to default" << "\n");
if (inMips16Mode() && !PreviousInMips16Mode) {
TM->setHelperClassesMips16();
PreviousInMips16Mode = true;
} else if (!inMips16Mode() && PreviousInMips16Mode) {
TM->setHelperClassesMipsSE();
PreviousInMips16Mode = false;
}
return;
}
}
bool MipsSubtarget::mipsSEUsesSoftFloat() const {
return TM->Options.UseSoftFloat && !InMips16HardFloat;
}
bool MipsSubtarget::useConstantIslands() {
DEBUG(dbgs() << "use constant islands " << Mips16ConstantIslands << "\n");
return Mips16ConstantIslands;
}
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