lib/Target/ARM/ARM.td

//===-- ARM.td - Describe the ARM Target Machine -----------*- tablegen -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//
//===----------------------------------------------------------------------===//

//===----------------------------------------------------------------------===//
// Target-independent interfaces which we are implementing
//===----------------------------------------------------------------------===//

include "llvm/Target/Target.td"

//===----------------------------------------------------------------------===//
// ARM Subtarget state.
//

def ModeThumb  : SubtargetFeature<"thumb-mode", "InThumbMode", "true",
                                  "Thumb mode">;

//===----------------------------------------------------------------------===//
// ARM Subtarget features.
//

def FeatureVFP2 : SubtargetFeature<"vfp2", "HasVFPv2", "true",
                                   "Enable VFP2 instructions">;
def FeatureVFP3 : SubtargetFeature<"vfp3", "HasVFPv3", "true",
                                   "Enable VFP3 instructions",
                                   [FeatureVFP2]>;
def FeatureVFP4 : SubtargetFeature<"vfp4", "HasVFPv4", "true",
                                   "Enable VFP4 instructions",
                                   [FeatureVFP3]>;
def FeatureNEON : SubtargetFeature<"neon", "HasNEON", "true",
                                   "Enable NEON instructions",
                                   [FeatureVFP3]>;
def FeatureNEONVFP4 : SubtargetFeature<"neon-vfpv4", "HasNEONVFPv4", "true",
                                       "Enable NEON-VFP4 instructions",
                                       [FeatureVFP4, FeatureNEON]>;
def FeatureThumb2 : SubtargetFeature<"thumb2", "HasThumb2", "true",
                                     "Enable Thumb2 instructions">;
def FeatureNoARM  : SubtargetFeature<"noarm", "NoARM", "true",
                                     "Does not support ARM mode execution">;
def FeatureFP16   : SubtargetFeature<"fp16", "HasFP16", "true",
                                     "Enable half-precision floating point">;
def FeatureD16    : SubtargetFeature<"d16", "HasD16", "true",
                                     "Restrict VFP3 to 16 double registers">;
def FeatureHWDiv  : SubtargetFeature<"hwdiv", "HasHardwareDivide", "true",
                                     "Enable divide instructions">;
def FeatureT2XtPk : SubtargetFeature<"t2xtpk", "HasT2ExtractPack", "true",
                                 "Enable Thumb2 extract and pack instructions">;
def FeatureDB     : SubtargetFeature<"db", "HasDataBarrier", "true",
                                   "Has data barrier (dmb / dsb) instructions">;
def FeatureSlowFPBrcc : SubtargetFeature<"slow-fp-brcc", "SlowFPBrcc", "true",
                                         "FP compare + branch is slow">;
def FeatureVFPOnlySP : SubtargetFeature<"fp-only-sp", "FPOnlySP", "true",
                          "Floating point unit supports single precision only">;

// Some processors have FP multiply-accumulate instructions that don't
// play nicely with other VFP / NEON instructions, and it's generally better
// to just not use them.
def FeatureHasSlowFPVMLx : SubtargetFeature<"slowfpvmlx", "SlowFPVMLx", "true",
                                         "Disable VFP / NEON MAC instructions">;

// Cortex-A8 / A9 Advanced SIMD has multiplier accumulator forwarding.
def FeatureVMLxForwarding : SubtargetFeature<"vmlx-forwarding",
                                       "HasVMLxForwarding", "true",
                                       "Has multiplier accumulator forwarding">;

// Some processors benefit from using NEON instructions for scalar
// single-precision FP operations.
def FeatureNEONForFP : SubtargetFeature<"neonfp", "UseNEONForSinglePrecisionFP",
                                        "true",
                                        "Use NEON for single precision FP">;

// Disable 32-bit to 16-bit narrowing for experimentation.
def FeaturePref32BitThumb : SubtargetFeature<"32bit", "Pref32BitThumb", "true",
                                             "Prefer 32-bit Thumb instrs">;

/// Some instructions update CPSR partially, which can add false dependency for
/// out-of-order implementation, e.g. Cortex-A9, unless each individual bit is
/// mapped to a separate physical register. Avoid partial CPSR update for these
/// processors.
def FeatureAvoidPartialCPSR : SubtargetFeature<"avoid-partial-cpsr",
                                               "AvoidCPSRPartialUpdate", "true",
                                 "Avoid CPSR partial update for OOO execution">;

// Some processors perform return stack prediction. CodeGen should avoid issue
// "normal" call instructions to callees which do not return.
def FeatureHasRAS : SubtargetFeature<"ras", "HasRAS", "true",
                                     "Has return address stack">;

/// Some M architectures don't have the DSP extension (v7E-M vs. v7M)
def FeatureDSPThumb2 : SubtargetFeature<"t2dsp", "Thumb2DSP", "true",
                                 "Supports v7 DSP instructions in Thumb2">;

// Multiprocessing extension.
def FeatureMP : SubtargetFeature<"mp", "HasMPExtension", "true",
                                 "Supports Multiprocessing extension">;

// M-series ISA?
def FeatureMClass : SubtargetFeature<"mclass", "IsMClass", "true",
                                     "Is microcontroller profile ('M' series)">;

// ARM ISAs.
def HasV4TOps   : SubtargetFeature<"v4t", "HasV4TOps", "true",
                                   "Support ARM v4T instructions">;
def HasV5TOps   : SubtargetFeature<"v5t", "HasV5TOps", "true",
                                   "Support ARM v5T instructions",
                                   [HasV4TOps]>;
def HasV5TEOps  : SubtargetFeature<"v5te", "HasV5TEOps", "true",
                             "Support ARM v5TE, v5TEj, and v5TExp instructions",
                                   [HasV5TOps]>;
def HasV6Ops    : SubtargetFeature<"v6", "HasV6Ops", "true",
                                   "Support ARM v6 instructions",
                                   [HasV5TEOps]>;
def HasV6T2Ops  : SubtargetFeature<"v6t2", "HasV6T2Ops", "true",
                                   "Support ARM v6t2 instructions",
                                   [HasV6Ops, FeatureThumb2]>;
def HasV7Ops    : SubtargetFeature<"v7", "HasV7Ops", "true",
                                   "Support ARM v7 instructions",
                                   [HasV6T2Ops]>;

//===----------------------------------------------------------------------===//
// ARM Processors supported.
//

include "ARMSchedule.td"

// ARM processor families.
def ProcA8      : SubtargetFeature<"a8", "ARMProcFamily", "CortexA8",
                                   "Cortex-A8 ARM processors",
                                   [FeatureSlowFPBrcc, FeatureNEONForFP,
                                    FeatureHasSlowFPVMLx, FeatureVMLxForwarding,
                                    FeatureT2XtPk]>;
def ProcA9      : SubtargetFeature<"a9", "ARMProcFamily", "CortexA9",
                                   "Cortex-A9 ARM processors",
                                   [FeatureVMLxForwarding,
                                    FeatureT2XtPk, FeatureFP16,
                                    FeatureAvoidPartialCPSR]>;

class ProcNoItin<string Name, list<SubtargetFeature> Features>
 : Processor<Name, GenericItineraries, Features>;

// V4 Processors.
def : ProcNoItin<"generic",         []>;
def : ProcNoItin<"arm8",            []>;
def : ProcNoItin<"arm810",          []>;
def : ProcNoItin<"strongarm",       []>;
def : ProcNoItin<"strongarm110",    []>;
def : ProcNoItin<"strongarm1100",   []>;
def : ProcNoItin<"strongarm1110",   []>;

// V4T Processors.
def : ProcNoItin<"arm7tdmi",        [HasV4TOps]>;
def : ProcNoItin<"arm7tdmi-s",      [HasV4TOps]>;
def : ProcNoItin<"arm710t",         [HasV4TOps]>;
def : ProcNoItin<"arm720t",         [HasV4TOps]>;
def : ProcNoItin<"arm9",            [HasV4TOps]>;
def : ProcNoItin<"arm9tdmi",        [HasV4TOps]>;
def : ProcNoItin<"arm920",          [HasV4TOps]>;
def : ProcNoItin<"arm920t",         [HasV4TOps]>;
def : ProcNoItin<"arm922t",         [HasV4TOps]>;
def : ProcNoItin<"arm940t",         [HasV4TOps]>;
def : ProcNoItin<"ep9312",          [HasV4TOps]>;

// V5T Processors.
def : ProcNoItin<"arm10tdmi",       [HasV5TOps]>;
def : ProcNoItin<"arm1020t",        [HasV5TOps]>;

// V5TE Processors.
def : ProcNoItin<"arm9e",           [HasV5TEOps]>;
def : ProcNoItin<"arm926ej-s",      [HasV5TEOps]>;
def : ProcNoItin<"arm946e-s",       [HasV5TEOps]>;
def : ProcNoItin<"arm966e-s",       [HasV5TEOps]>;
def : ProcNoItin<"arm968e-s",       [HasV5TEOps]>;
def : ProcNoItin<"arm10e",          [HasV5TEOps]>;
def : ProcNoItin<"arm1020e",        [HasV5TEOps]>;
def : ProcNoItin<"arm1022e",        [HasV5TEOps]>;
def : ProcNoItin<"xscale",          [HasV5TEOps]>;
def : ProcNoItin<"iwmmxt",          [HasV5TEOps]>;

// V6 Processors.
def : Processor<"arm1136j-s",       ARMV6Itineraries, [HasV6Ops]>;
def : Processor<"arm1136jf-s",      ARMV6Itineraries, [HasV6Ops, FeatureVFP2,
                                                       FeatureHasSlowFPVMLx]>;
def : Processor<"arm1176jz-s",      ARMV6Itineraries, [HasV6Ops]>;
def : Processor<"arm1176jzf-s",     ARMV6Itineraries, [HasV6Ops, FeatureVFP2,
                                                       FeatureHasSlowFPVMLx]>;
def : Processor<"mpcorenovfp",      ARMV6Itineraries, [HasV6Ops]>;
def : Processor<"mpcore",           ARMV6Itineraries, [HasV6Ops, FeatureVFP2,
                                                       FeatureHasSlowFPVMLx]>;

// V6M Processors.
def : Processor<"cortex-m0",        ARMV6Itineraries, [HasV6Ops, FeatureNoARM,
                                                       FeatureDB, FeatureMClass]>;

// V6T2 Processors.
def : Processor<"arm1156t2-s",      ARMV6Itineraries, [HasV6T2Ops,
                                                       FeatureDSPThumb2]>;
def : Processor<"arm1156t2f-s",     ARMV6Itineraries, [HasV6T2Ops, FeatureVFP2,
                                                       FeatureHasSlowFPVMLx,
                                                       FeatureDSPThumb2]>;

// V7a Processors.
def : Processor<"cortex-a8",        CortexA8Itineraries,
                                    [ProcA8, HasV7Ops, FeatureNEON, FeatureDB,
                                     FeatureDSPThumb2, FeatureHasRAS]>;
def : Processor<"cortex-a9",        CortexA9Itineraries,
                                    [ProcA9, HasV7Ops, FeatureNEON, FeatureDB,
                                     FeatureDSPThumb2, FeatureHasRAS]>;
def : Processor<"cortex-a9-mp",     CortexA9Itineraries,
                                    [ProcA9, HasV7Ops, FeatureNEON, FeatureDB,
                                     FeatureDSPThumb2, FeatureMP,
                                     FeatureHasRAS]>;

// V7M Processors.
def : ProcNoItin<"cortex-m3",       [HasV7Ops,
                                     FeatureThumb2, FeatureNoARM, FeatureDB,
                                     FeatureHWDiv, FeatureMClass]>;

// V7EM Processors.
def : ProcNoItin<"cortex-m4",       [HasV7Ops,
                                     FeatureThumb2, FeatureNoARM, FeatureDB,
                                     FeatureHWDiv, FeatureDSPThumb2,
                                     FeatureT2XtPk, FeatureVFP2,
                                     FeatureVFPOnlySP, FeatureMClass]>;

//===----------------------------------------------------------------------===//
// Register File Description
//===----------------------------------------------------------------------===//

include "ARMRegisterInfo.td"

include "ARMCallingConv.td"

//===----------------------------------------------------------------------===//
// Instruction Descriptions
//===----------------------------------------------------------------------===//

include "ARMInstrInfo.td"

def ARMInstrInfo : InstrInfo;


//===----------------------------------------------------------------------===//
// Assembly printer
//===----------------------------------------------------------------------===//
// ARM Uses the MC printer for asm output, so make sure the TableGen
// AsmWriter bits get associated with the correct class.
def ARMAsmWriter : AsmWriter {
  string AsmWriterClassName  = "InstPrinter";
  bit isMCAsmWriter = 1;
}

//===----------------------------------------------------------------------===//
// Declare the target which we are implementing
//===----------------------------------------------------------------------===//

def ARM : Target {
  // Pull in Instruction Info:
  let InstructionSet = ARMInstrInfo;

  let AssemblyWriters = [ARMAsmWriter];
}