xref: /freebsd/contrib/llvm-project/llvm/lib/Target/RISCV/RISCV.td (revision 590d96feea75246dee213cb528930df8f6234b87)

//===-- RISCV.td - Describe the RISCV Target Machine -------*- tablegen -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

include "llvm/Target/Target.td"

//===----------------------------------------------------------------------===//
// RISC-V subtarget features and instruction predicates.
//===----------------------------------------------------------------------===//

def FeatureStdExtM
    : SubtargetFeature<"m", "HasStdExtM", "true",
                       "'M' (Integer Multiplication and Division)">;
def HasStdExtM : Predicate<"Subtarget->hasStdExtM()">,
                           AssemblerPredicate<(all_of FeatureStdExtM),
                           "'M' (Integer Multiplication and Division)">;

def FeatureStdExtA
    : SubtargetFeature<"a", "HasStdExtA", "true",
                       "'A' (Atomic Instructions)">;
def HasStdExtA : Predicate<"Subtarget->hasStdExtA()">,
                           AssemblerPredicate<(all_of FeatureStdExtA),
                           "'A' (Atomic Instructions)">;

def FeatureStdExtF
    : SubtargetFeature<"f", "HasStdExtF", "true",
                       "'F' (Single-Precision Floating-Point)">;
def HasStdExtF : Predicate<"Subtarget->hasStdExtF()">,
                           AssemblerPredicate<(all_of FeatureStdExtF),
                           "'F' (Single-Precision Floating-Point)">;

def FeatureStdExtD
    : SubtargetFeature<"d", "HasStdExtD", "true",
                       "'D' (Double-Precision Floating-Point)",
                       [FeatureStdExtF]>;
def HasStdExtD : Predicate<"Subtarget->hasStdExtD()">,
                           AssemblerPredicate<(all_of FeatureStdExtD),
                           "'D' (Double-Precision Floating-Point)">;

def FeatureStdExtC
    : SubtargetFeature<"c", "HasStdExtC", "true",
                       "'C' (Compressed Instructions)">;
def HasStdExtC : Predicate<"Subtarget->hasStdExtC()">,
                           AssemblerPredicate<(all_of FeatureStdExtC),
                           "'C' (Compressed Instructions)">;

def FeatureExtZbb
    : SubtargetFeature<"experimental-zbb", "HasStdExtZbb", "true",
                       "'Zbb' (Base 'B' Instructions)">;
def HasStdExtZbb : Predicate<"Subtarget->hasStdExtZbb()">,
                             AssemblerPredicate<(all_of FeatureExtZbb),
                             "'Zbb' (Base 'B' Instructions)">;

def FeatureExtZbc
    : SubtargetFeature<"experimental-zbc", "HasStdExtZbc", "true",
                       "'Zbc' (Carry-Less 'B' Instructions)">;
def HasStdExtZbc : Predicate<"Subtarget->hasStdExtZbc()">,
                             AssemblerPredicate<(all_of FeatureExtZbc),
                             "'Zbc' (Carry-Less 'B' Instructions)">;

def FeatureExtZbe
    : SubtargetFeature<"experimental-zbe", "HasStdExtZbe", "true",
                       "'Zbe' (Extract-Deposit 'B' Instructions)">;
def HasStdExtZbe : Predicate<"Subtarget->hasStdExtZbe()">,
                             AssemblerPredicate<(all_of FeatureExtZbe),
                             "'Zbe' (Extract-Deposit 'B' Instructions)">;

def FeatureExtZbf
    : SubtargetFeature<"experimental-zbf", "HasStdExtZbf", "true",
                       "'Zbf' (Bit-Field 'B' Instructions)">;
def HasStdExtZbf : Predicate<"Subtarget->hasStdExtZbf()">,
                             AssemblerPredicate<(all_of FeatureExtZbf),
                             "'Zbf' (Bit-Field 'B' Instructions)">;

def FeatureExtZbm
    : SubtargetFeature<"experimental-zbm", "HasStdExtZbm", "true",
                       "'Zbm' (Matrix 'B' Instructions)">;
def HasStdExtZbm : Predicate<"Subtarget->hasStdExtZbm()">,
                             AssemblerPredicate<(all_of FeatureExtZbm),
                             "'Zbm' (Matrix 'B' Instructions)">;

def FeatureExtZbp
    : SubtargetFeature<"experimental-zbp", "HasStdExtZbp", "true",
                       "'Zbp' (Permutation 'B' Instructions)">;
def HasStdExtZbp : Predicate<"Subtarget->hasStdExtZbp()">,
                             AssemblerPredicate<(all_of FeatureExtZbp),
                             "'Zbp' (Permutation 'B' Instructions)">;

def FeatureExtZbr
    : SubtargetFeature<"experimental-zbr", "HasStdExtZbr", "true",
                       "'Zbr' (Polynomial Reduction 'B' Instructions)">;
def HasStdExtZbr : Predicate<"Subtarget->hasStdExtZbr()">,
                             AssemblerPredicate<(all_of FeatureExtZbr),
                             "'Zbr' (Polynomial Reduction 'B' Instructions)">;

def FeatureExtZbs
    : SubtargetFeature<"experimental-zbs", "HasStdExtZbs", "true",
                       "'Zbs' (Single-Bit 'B' Instructions)">;
def HasStdExtZbs : Predicate<"Subtarget->hasStdExtZbs()">,
                             AssemblerPredicate<(all_of FeatureExtZbs),
                             "'Zbs' (Single-Bit 'B' Instructions)">;

def FeatureExtZbt
    : SubtargetFeature<"experimental-zbt", "HasStdExtZbt", "true",
                       "'Zbt' (Ternary 'B' Instructions)">;
def HasStdExtZbt : Predicate<"Subtarget->hasStdExtZbt()">,
                             AssemblerPredicate<(all_of FeatureExtZbt),
                             "'Zbt' (Ternary 'B' Instructions)">;

// Some instructions belong to both the basic and the permutation
// subextensions. They should be enabled if either has been specified.
def HasStdExtZbbOrZbp
    : Predicate<"Subtarget->hasStdExtZbb() || Subtarget->hasStdExtZbp()">,
                AssemblerPredicate<(any_of FeatureExtZbb, FeatureExtZbp)>;

def FeatureExtZbproposedc
    : SubtargetFeature<"experimental-zbproposedc", "HasStdExtZbproposedc", "true",
                       "'Zbproposedc' (Proposed Compressed 'B' Instructions)">;
def HasStdExtZbproposedc : Predicate<"Subtarget->hasStdExtZbproposedc()">,
                           AssemblerPredicate<(all_of FeatureExtZbproposedc),
                           "'Zbproposedc' (Proposed Compressed 'B' Instructions)">;

def FeatureStdExtB
    : SubtargetFeature<"experimental-b", "HasStdExtB", "true",
                       "'B' (Bit Manipulation Instructions)",
                       [FeatureExtZbb,
                        FeatureExtZbc,
                        FeatureExtZbe,
                        FeatureExtZbf,
                        FeatureExtZbm,
                        FeatureExtZbp,
                        FeatureExtZbr,
                        FeatureExtZbs,
                        FeatureExtZbt]>;
def HasStdExtB : Predicate<"Subtarget->hasStdExtB()">,
                           AssemblerPredicate<(all_of FeatureStdExtB),
                           "'B' (Bit Manipulation Instructions)">;

def FeatureNoRVCHints
    : SubtargetFeature<"no-rvc-hints", "EnableRVCHintInstrs", "false",
                       "Disable RVC Hint Instructions.">;
def HasRVCHints : Predicate<"Subtarget->enableRVCHintInstrs()">,
                  AssemblerPredicate<(all_of(not FeatureNoRVCHints)),
                                     "RVC Hint Instructions">;

def FeatureStdExtV
    : SubtargetFeature<"experimental-v", "HasStdExtV", "true",
                       "'V' (Vector Instructions)",
                       [FeatureStdExtF]>;
def HasStdExtV : Predicate<"Subtarget->hasStdExtV()">,
                           AssemblerPredicate<(all_of FeatureStdExtV),
                           "'V' (Vector Instructions)">;

def Feature64Bit
    : SubtargetFeature<"64bit", "HasRV64", "true", "Implements RV64">;
def IsRV64 : Predicate<"Subtarget->is64Bit()">,
                       AssemblerPredicate<(all_of Feature64Bit),
                       "RV64I Base Instruction Set">;
def IsRV32 : Predicate<"!Subtarget->is64Bit()">,
                       AssemblerPredicate<(all_of (not Feature64Bit)),
                       "RV32I Base Instruction Set">;

def RV64           : HwMode<"+64bit">;
def RV32           : HwMode<"-64bit">;

def FeatureRV32E
    : SubtargetFeature<"e", "IsRV32E", "true",
                       "Implements RV32E (provides 16 rather than 32 GPRs)">;
def IsRV32E : Predicate<"Subtarget->isRV32E()">,
                        AssemblerPredicate<(all_of FeatureRV32E)>;

def FeatureRelax
    : SubtargetFeature<"relax", "EnableLinkerRelax", "true",
                       "Enable Linker relaxation.">;

foreach i = {1-31} in
    def FeatureReserveX#i :
        SubtargetFeature<"reserve-x"#i, "UserReservedRegister[RISCV::X"#i#"]",
                         "true", "Reserve X"#i>;

def FeatureSaveRestore : SubtargetFeature<"save-restore", "EnableSaveRestore",
                                          "true", "Enable save/restore.">;

//===----------------------------------------------------------------------===//
// Named operands for CSR instructions.
//===----------------------------------------------------------------------===//

include "RISCVSystemOperands.td"

//===----------------------------------------------------------------------===//
// Registers, calling conventions, instruction descriptions.
//===----------------------------------------------------------------------===//

include "RISCVSchedule.td"
include "RISCVRegisterInfo.td"
include "RISCVCallingConv.td"
include "RISCVInstrInfo.td"
include "RISCVRegisterBanks.td"
include "RISCVSchedRocket32.td"
include "RISCVSchedRocket64.td"

//===----------------------------------------------------------------------===//
// RISC-V processors supported.
//===----------------------------------------------------------------------===//

def : ProcessorModel<"generic-rv32", NoSchedModel, []>;

def : ProcessorModel<"generic-rv64", NoSchedModel, [Feature64Bit]>;

def : ProcessorModel<"rocket-rv32", Rocket32Model, []>;

def : ProcessorModel<"rocket-rv64", Rocket64Model, [Feature64Bit]>;

def : ProcessorModel<"sifive-e31", Rocket32Model, [FeatureStdExtM,
                                                   FeatureStdExtA,
                                                   FeatureStdExtC]>;

def : ProcessorModel<"sifive-u54", Rocket64Model, [Feature64Bit,
                                                   FeatureStdExtM,
                                                   FeatureStdExtA,
                                                   FeatureStdExtF,
                                                   FeatureStdExtD,
                                                   FeatureStdExtC]>;

//===----------------------------------------------------------------------===//
// Define the RISC-V target.
//===----------------------------------------------------------------------===//

def RISCVInstrInfo : InstrInfo {
  let guessInstructionProperties = 0;
}

def RISCVAsmParser : AsmParser {
  let ShouldEmitMatchRegisterAltName = 1;
  let AllowDuplicateRegisterNames = 1;
}

def RISCVAsmWriter : AsmWriter {
  int PassSubtarget = 1;
}

def RISCV : Target {
  let InstructionSet = RISCVInstrInfo;
  let AssemblyParsers = [RISCVAsmParser];
  let AssemblyWriters = [RISCVAsmWriter];
  let AllowRegisterRenaming = 1;
}