src/llvm/lib/Target/ARM/ARM.td

   1 //===-- ARM.td - Describe the ARM Target Machine -----------*- tablegen -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 //===----------------------------------------------------------------------===//
  14 // Target-independent interfaces which we are implementing
  15 //===----------------------------------------------------------------------===//
  16
  17 include "llvm/Target/Target.td"
  18
  19 //===----------------------------------------------------------------------===//
  20 // ARM Subtarget state.
  21 //
  22
  23 def ModeThumb  : SubtargetFeature<"thumb-mode", "InThumbMode", "true",
  24                                   "Thumb mode">;
  25
  26 //===----------------------------------------------------------------------===//
  27 // ARM Subtarget features.
  28 //
  29
  30 def FeatureVFP2 : SubtargetFeature<"vfp2", "HasVFPv2", "true",
  31                                    "Enable VFP2 instructions">;
  32 def FeatureVFP3 : SubtargetFeature<"vfp3", "HasVFPv3", "true",
  33                                    "Enable VFP3 instructions",
  34                                    [FeatureVFP2]>;
  35 def FeatureNEON : SubtargetFeature<"neon", "HasNEON", "true",
  36                                    "Enable NEON instructions",
  37                                    [FeatureVFP3]>;
  38 def FeatureThumb2 : SubtargetFeature<"thumb2", "HasThumb2", "true",
  39                                      "Enable Thumb2 instructions">;
  40 def FeatureNoARM  : SubtargetFeature<"noarm", "NoARM", "true",
  41                                      "Does not support ARM mode execution">;
  42 def FeatureFP16   : SubtargetFeature<"fp16", "HasFP16", "true",
  43                                      "Enable half-precision floating point">;
  44 def FeatureVFP4   : SubtargetFeature<"vfp4", "HasVFPv4", "true",
  45                                      "Enable VFP4 instructions",
  46                                      [FeatureVFP3, FeatureFP16]>;
  47 def FeatureD16    : SubtargetFeature<"d16", "HasD16", "true",
  48                                      "Restrict VFP3 to 16 double registers">;
  49 def FeatureHWDiv  : SubtargetFeature<"hwdiv", "HasHardwareDivide", "true",
  50                                      "Enable divide instructions">;
  51 def FeatureHWDivARM  : SubtargetFeature<"hwdiv-arm",
  52                                         "HasHardwareDivideInARM", "true",
  53                                       "Enable divide instructions in ARM mode">;
  54 def FeatureT2XtPk : SubtargetFeature<"t2xtpk", "HasT2ExtractPack", "true",
  55                                  "Enable Thumb2 extract and pack instructions">;
  56 def FeatureDB     : SubtargetFeature<"db", "HasDataBarrier", "true",
  57                                    "Has data barrier (dmb / dsb) instructions">;
  58 def FeatureSlowFPBrcc : SubtargetFeature<"slow-fp-brcc", "SlowFPBrcc", "true",
  59                                          "FP compare + branch is slow">;
  60 def FeatureVFPOnlySP : SubtargetFeature<"fp-only-sp", "FPOnlySP", "true",
  61                           "Floating point unit supports single precision only">;
  62
  63 // Some processors have FP multiply-accumulate instructions that don't
  64 // play nicely with other VFP / NEON instructions, and it's generally better
  65 // to just not use them.
  66 def FeatureHasSlowFPVMLx : SubtargetFeature<"slowfpvmlx", "SlowFPVMLx", "true",
  67                                          "Disable VFP / NEON MAC instructions">;
  68
  69 // Cortex-A8 / A9 Advanced SIMD has multiplier accumulator forwarding.
  70 def FeatureVMLxForwarding : SubtargetFeature<"vmlx-forwarding",
  71                                        "HasVMLxForwarding", "true",
  72                                        "Has multiplier accumulator forwarding">;
  73
  74 // Some processors benefit from using NEON instructions for scalar
  75 // single-precision FP operations.
  76 def FeatureNEONForFP : SubtargetFeature<"neonfp", "UseNEONForSinglePrecisionFP",
  77                                         "true",
  78                                         "Use NEON for single precision FP">;
  79
  80 // Disable 32-bit to 16-bit narrowing for experimentation.
  81 def FeaturePref32BitThumb : SubtargetFeature<"32bit", "Pref32BitThumb", "true",
  82                                              "Prefer 32-bit Thumb instrs">;
  83
  84 /// Some instructions update CPSR partially, which can add false dependency for
  85 /// out-of-order implementation, e.g. Cortex-A9, unless each individual bit is
  86 /// mapped to a separate physical register. Avoid partial CPSR update for these
  87 /// processors.
  88 def FeatureAvoidPartialCPSR : SubtargetFeature<"avoid-partial-cpsr",
  89                                                "AvoidCPSRPartialUpdate", "true",
  90                                  "Avoid CPSR partial update for OOO execution">;
  91
  92 // Some processors perform return stack prediction. CodeGen should avoid issue
  93 // "normal" call instructions to callees which do not return.
  94 def FeatureHasRAS : SubtargetFeature<"ras", "HasRAS", "true",
  95                                      "Has return address stack">;
  96
  97 /// Some M architectures don't have the DSP extension (v7E-M vs. v7M)
  98 def FeatureDSPThumb2 : SubtargetFeature<"t2dsp", "Thumb2DSP", "true",
  99                                  "Supports v7 DSP instructions in Thumb2">;
 100
 101 // Multiprocessing extension.
 102 def FeatureMP : SubtargetFeature<"mp", "HasMPExtension", "true",
 103                                  "Supports Multiprocessing extension">;
 104
 105 // M-series ISA?
 106 def FeatureMClass : SubtargetFeature<"mclass", "IsMClass", "true",
 107                                      "Is microcontroller profile ('M' series)">;
 108
 109 // ARM ISAs.
 110 def HasV4TOps   : SubtargetFeature<"v4t", "HasV4TOps", "true",
 111                                    "Support ARM v4T instructions">;
 112 def HasV5TOps   : SubtargetFeature<"v5t", "HasV5TOps", "true",
 113                                    "Support ARM v5T instructions",
 114                                    [HasV4TOps]>;
 115 def HasV5TEOps  : SubtargetFeature<"v5te", "HasV5TEOps", "true",
 116                              "Support ARM v5TE, v5TEj, and v5TExp instructions",
 117                                    [HasV5TOps]>;
 118 def HasV6Ops    : SubtargetFeature<"v6", "HasV6Ops", "true",
 119                                    "Support ARM v6 instructions",
 120                                    [HasV5TEOps]>;
 121 def HasV6T2Ops  : SubtargetFeature<"v6t2", "HasV6T2Ops", "true",
 122                                    "Support ARM v6t2 instructions",
 123                                    [HasV6Ops, FeatureThumb2]>;
 124 def HasV7Ops    : SubtargetFeature<"v7", "HasV7Ops", "true",
 125                                    "Support ARM v7 instructions",
 126                                    [HasV6T2Ops]>;
 127
 128 //===----------------------------------------------------------------------===//
 129 // ARM Processors supported.
 130 //
 131
 132 include "ARMSchedule.td"
 133
 134 // ARM processor families.
 135 def ProcA8      : SubtargetFeature<"a8", "ARMProcFamily", "CortexA8",
 136                                    "Cortex-A8 ARM processors",
 137                                    [FeatureSlowFPBrcc, FeatureNEONForFP,
 138                                     FeatureHasSlowFPVMLx, FeatureVMLxForwarding,
 139                                     FeatureT2XtPk]>;
 140 def ProcA9      : SubtargetFeature<"a9", "ARMProcFamily", "CortexA9",
 141                                    "Cortex-A9 ARM processors",
 142                                    [FeatureVMLxForwarding,
 143                                     FeatureT2XtPk, FeatureFP16,
 144                                     FeatureAvoidPartialCPSR]>;
 145 def ProcSwift   : SubtargetFeature<"swift", "ARMProcFamily", "Swift",
 146                                    "Swift ARM processors",
 147                                    [FeatureNEONForFP, FeatureT2XtPk,
 148                                     FeatureVFP4, FeatureMP, FeatureHWDiv,
 149                                     FeatureHWDivARM, FeatureAvoidPartialCPSR,
 150                                     FeatureHasSlowFPVMLx]>;
 151
 152 // FIXME: It has not been determined if A15 has these features.
 153 def ProcA15      : SubtargetFeature<"a15", "ARMProcFamily", "CortexA15",
 154                                    "Cortex-A15 ARM processors",
 155                                    [FeatureT2XtPk, FeatureFP16,
 156                                     FeatureAvoidPartialCPSR]>;
 157
 158 class ProcNoItin<string Name, list<SubtargetFeature> Features>
 159  : Processor<Name, NoItineraries, Features>;
 160
 161 // V4 Processors.
 162 def : ProcNoItin<"generic",         []>;
 163 def : ProcNoItin<"arm8",            []>;
 164 def : ProcNoItin<"arm810",          []>;
 165 def : ProcNoItin<"strongarm",       []>;
 166 def : ProcNoItin<"strongarm110",    []>;
 167 def : ProcNoItin<"strongarm1100",   []>;
 168 def : ProcNoItin<"strongarm1110",   []>;
 169
 170 // V4T Processors.
 171 def : ProcNoItin<"arm7tdmi",        [HasV4TOps]>;
 172 def : ProcNoItin<"arm7tdmi-s",      [HasV4TOps]>;
 173 def : ProcNoItin<"arm710t",         [HasV4TOps]>;
 174 def : ProcNoItin<"arm720t",         [HasV4TOps]>;
 175 def : ProcNoItin<"arm9",            [HasV4TOps]>;
 176 def : ProcNoItin<"arm9tdmi",        [HasV4TOps]>;
 177 def : ProcNoItin<"arm920",          [HasV4TOps]>;
 178 def : ProcNoItin<"arm920t",         [HasV4TOps]>;
 179 def : ProcNoItin<"arm922t",         [HasV4TOps]>;
 180 def : ProcNoItin<"arm940t",         [HasV4TOps]>;
 181 def : ProcNoItin<"ep9312",          [HasV4TOps]>;
 182
 183 // V5T Processors.
 184 def : ProcNoItin<"arm10tdmi",       [HasV5TOps]>;
 185 def : ProcNoItin<"arm1020t",        [HasV5TOps]>;
 186
 187 // V5TE Processors.
 188 def : ProcNoItin<"arm9e",           [HasV5TEOps]>;
 189 def : ProcNoItin<"arm926ej-s",      [HasV5TEOps]>;
 190 def : ProcNoItin<"arm946e-s",       [HasV5TEOps]>;
 191 def : ProcNoItin<"arm966e-s",       [HasV5TEOps]>;
 192 def : ProcNoItin<"arm968e-s",       [HasV5TEOps]>;
 193 def : ProcNoItin<"arm10e",          [HasV5TEOps]>;
 194 def : ProcNoItin<"arm1020e",        [HasV5TEOps]>;
 195 def : ProcNoItin<"arm1022e",        [HasV5TEOps]>;
 196 def : ProcNoItin<"xscale",          [HasV5TEOps]>;
 197 def : ProcNoItin<"iwmmxt",          [HasV5TEOps]>;
 198
 199 // V6 Processors.
 200 def : Processor<"arm1136j-s",       ARMV6Itineraries, [HasV6Ops]>;
 201 def : Processor<"arm1136jf-s",      ARMV6Itineraries, [HasV6Ops, FeatureVFP2,
 202                                                        FeatureHasSlowFPVMLx]>;
 203 def : Processor<"arm1176jz-s",      ARMV6Itineraries, [HasV6Ops]>;
 204 def : Processor<"arm1176jzf-s",     ARMV6Itineraries, [HasV6Ops, FeatureVFP2,
 205                                                        FeatureHasSlowFPVMLx]>;
 206 def : Processor<"mpcorenovfp",      ARMV6Itineraries, [HasV6Ops]>;
 207 def : Processor<"mpcore",           ARMV6Itineraries, [HasV6Ops, FeatureVFP2,
 208                                                        FeatureHasSlowFPVMLx]>;
 209
 210 // V6M Processors.
 211 def : Processor<"cortex-m0",        ARMV6Itineraries, [HasV6Ops, FeatureNoARM,
 212                                                        FeatureDB, FeatureMClass]>;
 213
 214 // V6T2 Processors.
 215 def : Processor<"arm1156t2-s",      ARMV6Itineraries, [HasV6T2Ops,
 216                                                        FeatureDSPThumb2]>;
 217 def : Processor<"arm1156t2f-s",     ARMV6Itineraries, [HasV6T2Ops, FeatureVFP2,
 218                                                        FeatureHasSlowFPVMLx,
 219                                                        FeatureDSPThumb2]>;
 220
 221 // V7a Processors.
 222 def : ProcessorModel<"cortex-a8",   CortexA8Model,
 223                                     [ProcA8, HasV7Ops, FeatureNEON, FeatureDB,
 224                                      FeatureDSPThumb2, FeatureHasRAS]>;
 225 def : ProcessorModel<"cortex-a9",   CortexA9Model,
 226                                     [ProcA9, HasV7Ops, FeatureNEON, FeatureDB,
 227                                      FeatureDSPThumb2, FeatureHasRAS]>;
 228 def : ProcessorModel<"cortex-a9-mp", CortexA9Model,
 229                                     [ProcA9, HasV7Ops, FeatureNEON, FeatureDB,
 230                                      FeatureDSPThumb2, FeatureMP,
 231                                      FeatureHasRAS]>;
 232 // FIXME: A15 has currently the same ProcessorModel as A9.
 233 def : ProcessorModel<"cortex-a15",   CortexA9Model,
 234                                     [ProcA15, HasV7Ops, FeatureNEON, FeatureDB,
 235                                      FeatureDSPThumb2, FeatureHasRAS]>;
 236
 237 // V7M Processors.
 238 def : ProcNoItin<"cortex-m3",       [HasV7Ops,
 239                                      FeatureThumb2, FeatureNoARM, FeatureDB,
 240                                      FeatureHWDiv, FeatureMClass]>;
 241
 242 // V7EM Processors.
 243 def : ProcNoItin<"cortex-m4",       [HasV7Ops,
 244                                      FeatureThumb2, FeatureNoARM, FeatureDB,
 245                                      FeatureHWDiv, FeatureDSPThumb2,
 246                                      FeatureT2XtPk, FeatureVFP4,
 247                                      FeatureVFPOnlySP, FeatureMClass]>;
 248
 249 // Swift uArch Processors.
 250 def : ProcessorModel<"swift",       SwiftModel,
 251                                     [ProcSwift, HasV7Ops, FeatureNEON,
 252                                      FeatureDB, FeatureDSPThumb2,
 253                                      FeatureHasRAS]>;
 254
 255 //===----------------------------------------------------------------------===//
 256 // Register File Description
 257 //===----------------------------------------------------------------------===//
 258
 259 include "ARMRegisterInfo.td"
 260
 261 include "ARMCallingConv.td"
 262
 263 //===----------------------------------------------------------------------===//
 264 // Instruction Descriptions
 265 //===----------------------------------------------------------------------===//
 266
 267 include "ARMInstrInfo.td"
 268
 269 def ARMInstrInfo : InstrInfo;
 270
 271
 272 //===----------------------------------------------------------------------===//
 273 // Assembly printer
 274 //===----------------------------------------------------------------------===//
 275 // ARM Uses the MC printer for asm output, so make sure the TableGen
 276 // AsmWriter bits get associated with the correct class.
 277 def ARMAsmWriter : AsmWriter {
 278   string AsmWriterClassName  = "InstPrinter";
 279   bit isMCAsmWriter = 1;
 280 }
 281
 282 //===----------------------------------------------------------------------===//
 283 // Declare the target which we are implementing
 284 //===----------------------------------------------------------------------===//
 285
 286 def ARM : Target {
 287   // Pull in Instruction Info:
 288   let InstructionSet = ARMInstrInfo;
 289
 290   let AssemblyWriters = [ARMAsmWriter];
 291 }