--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/Target/Mips/MipsSubtarget.cpp	Thu Dec 12 13:56:28 2013 +0900
@@ -0,0 +1,176 @@
+//===-- 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;
+}