hanchenye-llvm-project/llvm/lib/Target/Mips/Mips.td

//===- Mips.td - Describe the Mips Target Machine ---------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// This is the top level entry point for the Mips target.
//===----------------------------------------------------------------------===//

//===----------------------------------------------------------------------===//
// Target-independent interfaces
//===----------------------------------------------------------------------===//

include "../Target.td"

//===----------------------------------------------------------------------===//
// Register File, Calling Conv, Instruction Descriptions
//===----------------------------------------------------------------------===//

include "MipsRegisterInfo.td"
include "MipsSchedule.td"
include "MipsInstrInfo.td"
include "MipsCallingConv.td"

def MipsInstrInfo : InstrInfo {
  let TSFlagsFields = [];
  let TSFlagsShifts = [];
}

//===----------------------------------------------------------------------===//
// Mips Subtarget features                                                    //
//===----------------------------------------------------------------------===//

def FeatureGP64Bit      : SubtargetFeature<"gp64", "IsGP64bit", "true",
                                "General Purpose Registers are 64-bit wide.">;
def FeatureFP64Bit      : SubtargetFeature<"fp64", "IsFP64bit", "true",
                                "Support 64-bit FP registers.">;
def FeatureSingleFloat  : SubtargetFeature<"single-float", "IsSingleFloat",
                                "true", "Only supports single precision float">;
def FeatureAllegrexVFPU : SubtargetFeature<"allegrex-vfpu", "HasAllegrexVFPU", 
                                "true", "Enable Allegrex VFPU instructions.">;
def FeatureMips2        : SubtargetFeature<"mips2", "MipsArchVersion", "Mips2",
                                "Mips2 ISA Support">;
def FeatureO32          : SubtargetFeature<"o32", "MipsABI", "O32",
                                "Enable o32 ABI">;
def FeatureEABI         : SubtargetFeature<"eabi", "MipsABI", "EABI",
                                "Enable eabi ABI">;

//===----------------------------------------------------------------------===//
// Mips processors supported.
//===----------------------------------------------------------------------===//

class Proc<string Name, list<SubtargetFeature> Features>
 : Processor<Name, MipsGenericItineraries, Features>;

def : Proc<"mips1", []>;
def : Proc<"r2000", []>;
def : Proc<"r3000", []>;

def : Proc<"mips2", [FeatureMips2]>;
def : Proc<"r6000", [FeatureMips2]>;

// Allegrex is a 32bit subset of r4000, both for interger and fp registers, 
// but much more similar to Mips2 than Mips3. 
def : Proc<"allegrex", [FeatureMips2, FeatureSingleFloat, FeatureAllegrexVFPU,
                        FeatureEABI]>;

def Mips : Target {
  let InstructionSet = MipsInstrInfo;
}