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 def ModeNaCl   : SubtargetFeature<"nacl-mode", "InNaClMode", "true",
  27                                   "Native client mode">;
  28
  29 //===----------------------------------------------------------------------===//
  30 // ARM Subtarget features.
  31 //
  32
  33 def FeatureVFP2 : SubtargetFeature<"vfp2", "HasVFPv2", "true",
  34                                    "Enable VFP2 instructions">;
  35 def FeatureVFP3 : SubtargetFeature<"vfp3", "HasVFPv3", "true",
  36                                    "Enable VFP3 instructions",
  37                                    [FeatureVFP2]>;
  38 def FeatureNEON : SubtargetFeature<"neon", "HasNEON", "true",
  39                                    "Enable NEON instructions",
  40                                    [FeatureVFP3]>;
  41 def FeatureThumb2 : SubtargetFeature<"thumb2", "HasThumb2", "true",
  42                                      "Enable Thumb2 instructions">;
  43 def FeatureNoARM  : SubtargetFeature<"noarm", "NoARM", "true",
  44                                      "Does not support ARM mode execution">;
  45 def FeatureFP16   : SubtargetFeature<"fp16", "HasFP16", "true",
  46                                      "Enable half-precision floating point">;
  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 FeatureT2XtPk : SubtargetFeature<"t2xtpk", "HasT2ExtractPack", "true",
  52                                  "Enable Thumb2 extract and pack instructions">;
  53 def FeatureDB     : SubtargetFeature<"db", "HasDataBarrier", "true",
  54                                    "Has data barrier (dmb / dsb) instructions">;
  55 def FeatureSlowFPBrcc : SubtargetFeature<"slow-fp-brcc", "SlowFPBrcc", "true",
  56                                          "FP compare + branch is slow">;
  57 def FeatureVFPOnlySP : SubtargetFeature<"fp-only-sp", "FPOnlySP", "true",
  58                           "Floating point unit supports single precision only">;
  59
  60 // Some processors have FP multiply-accumulate instructions that don't
  61 // play nicely with other VFP / NEON instructions, and it's generally better
  62 // to just not use them.
  63 def FeatureHasSlowFPVMLx : SubtargetFeature<"slowfpvmlx", "SlowFPVMLx", "true",
  64                                          "Disable VFP / NEON MAC instructions">;
  65
  66 // Cortex-A8 / A9 Advanced SIMD has multiplier accumulator forwarding.
  67 def FeatureVMLxForwarding : SubtargetFeature<"vmlx-forwarding",
  68                                        "HasVMLxForwarding", "true",
  69                                        "Has multiplier accumulator forwarding">;
  70
  71 // Some processors benefit from using NEON instructions for scalar
  72 // single-precision FP operations.
  73 def FeatureNEONForFP : SubtargetFeature<"neonfp", "UseNEONForSinglePrecisionFP",
  74                                         "true",
  75                                         "Use NEON for single precision FP">;
  76
  77 // Disable 32-bit to 16-bit narrowing for experimentation.
  78 def FeaturePref32BitThumb : SubtargetFeature<"32bit", "Pref32BitThumb", "true",
  79                                              "Prefer 32-bit Thumb instrs">;
  80
  81 /// Some instructions update CPSR partially, which can add false dependency for
  82 /// out-of-order implementation, e.g. Cortex-A9, unless each individual bit is
  83 /// mapped to a separate physical register. Avoid partial CPSR update for these
  84 /// processors.
  85 def FeatureAvoidPartialCPSR : SubtargetFeature<"avoid-partial-cpsr",
  86                                                "AvoidCPSRPartialUpdate", "true",
  87                                  "Avoid CPSR partial update for OOO execution">;
  88
  89 /// Some M architectures don't have the DSP extension (v7E-M vs. v7M)
  90 def FeatureDSPThumb2 : SubtargetFeature<"t2dsp", "Thumb2DSP", "true",
  91                                  "Supports v7 DSP instructions in Thumb2">;
  92
  93 // Multiprocessing extension.
  94 def FeatureMP : SubtargetFeature<"mp", "HasMPExtension", "true",
  95                                  "Supports Multiprocessing extension">;
  96
  97 // ARM ISAs.
  98 def HasV4TOps   : SubtargetFeature<"v4t", "HasV4TOps", "true",
  99                                    "Support ARM v4T instructions">;
 100 def HasV5TOps   : SubtargetFeature<"v5t", "HasV5TOps", "true",
 101                                    "Support ARM v5T instructions",
 102                                    [HasV4TOps]>;
 103 def HasV5TEOps  : SubtargetFeature<"v5te", "HasV5TEOps", "true",
 104                              "Support ARM v5TE, v5TEj, and v5TExp instructions",
 105                                    [HasV5TOps]>;
 106 def HasV6Ops    : SubtargetFeature<"v6", "HasV6Ops", "true",
 107                                    "Support ARM v6 instructions",
 108                                    [HasV5TEOps]>;
 109 def HasV6T2Ops  : SubtargetFeature<"v6t2", "HasV6T2Ops", "true",
 110                                    "Support ARM v6t2 instructions",
 111                                    [HasV6Ops, FeatureThumb2, FeatureDSPThumb2]>;
 112 def HasV7Ops    : SubtargetFeature<"v7", "HasV7Ops", "true",
 113                                    "Support ARM v7 instructions",
 114                                    [HasV6T2Ops]>;
 115
 116 //===----------------------------------------------------------------------===//
 117 // ARM Processors supported.
 118 //
 119
 120 include "ARMSchedule.td"
 121
 122 // ARM processor families.
 123 def ProcA8      : SubtargetFeature<"a8", "ARMProcFamily", "CortexA8",
 124                                    "Cortex-A8 ARM processors",
 125                                    [FeatureSlowFPBrcc, FeatureNEONForFP,
 126                                     FeatureHasSlowFPVMLx, FeatureVMLxForwarding,
 127                                     FeatureT2XtPk]>;
 128 def ProcA9      : SubtargetFeature<"a9", "ARMProcFamily", "CortexA9",
 129                                    "Cortex-A9 ARM processors",
 130                                    [FeatureVMLxForwarding,
 131                                     FeatureT2XtPk, FeatureFP16,
 132                                     FeatureAvoidPartialCPSR]>;
 133
 134 class ProcNoItin<string Name, list<SubtargetFeature> Features>
 135  : Processor<Name, GenericItineraries, Features>;
 136
 137 // V4 Processors.
 138 def : ProcNoItin<"generic",         []>;
 139 def : ProcNoItin<"arm8",            []>;
 140 def : ProcNoItin<"arm810",          []>;
 141 def : ProcNoItin<"strongarm",       []>;
 142 def : ProcNoItin<"strongarm110",    []>;
 143 def : ProcNoItin<"strongarm1100",   []>;
 144 def : ProcNoItin<"strongarm1110",   []>;
 145
 146 // V4T Processors.
 147 def : ProcNoItin<"arm7tdmi",        [HasV4TOps]>;
 148 def : ProcNoItin<"arm7tdmi-s",      [HasV4TOps]>;
 149 def : ProcNoItin<"arm710t",         [HasV4TOps]>;
 150 def : ProcNoItin<"arm720t",         [HasV4TOps]>;
 151 def : ProcNoItin<"arm9",            [HasV4TOps]>;
 152 def : ProcNoItin<"arm9tdmi",        [HasV4TOps]>;
 153 def : ProcNoItin<"arm920",          [HasV4TOps]>;
 154 def : ProcNoItin<"arm920t",         [HasV4TOps]>;
 155 def : ProcNoItin<"arm922t",         [HasV4TOps]>;
 156 def : ProcNoItin<"arm940t",         [HasV4TOps]>;
 157 def : ProcNoItin<"ep9312",          [HasV4TOps]>;
 158
 159 // V5T Processors.
 160 def : ProcNoItin<"arm10tdmi",       [HasV5TOps]>;
 161 def : ProcNoItin<"arm1020t",        [HasV5TOps]>;
 162
 163 // V5TE Processors.
 164 def : ProcNoItin<"arm9e",           [HasV5TEOps]>;
 165 def : ProcNoItin<"arm926ej-s",      [HasV5TEOps]>;
 166 def : ProcNoItin<"arm946e-s",       [HasV5TEOps]>;
 167 def : ProcNoItin<"arm966e-s",       [HasV5TEOps]>;
 168 def : ProcNoItin<"arm968e-s",       [HasV5TEOps]>;
 169 def : ProcNoItin<"arm10e",          [HasV5TEOps]>;
 170 def : ProcNoItin<"arm1020e",        [HasV5TEOps]>;
 171 def : ProcNoItin<"arm1022e",        [HasV5TEOps]>;
 172 def : ProcNoItin<"xscale",          [HasV5TEOps]>;
 173 def : ProcNoItin<"iwmmxt",          [HasV5TEOps]>;
 174
 175 // V6 Processors.
 176 def : Processor<"arm1136j-s",       ARMV6Itineraries, [HasV6Ops]>;
 177 def : Processor<"arm1136jf-s",      ARMV6Itineraries, [HasV6Ops, FeatureVFP2,
 178                                                        FeatureHasSlowFPVMLx]>;
 179 def : Processor<"arm1176jz-s",      ARMV6Itineraries, [HasV6Ops]>;
 180 def : Processor<"arm1176jzf-s",     ARMV6Itineraries, [HasV6Ops, FeatureVFP2,
 181                                                        FeatureHasSlowFPVMLx]>;
 182 def : Processor<"mpcorenovfp",      ARMV6Itineraries, [HasV6Ops]>;
 183 def : Processor<"mpcore",           ARMV6Itineraries, [HasV6Ops, FeatureVFP2,
 184                                                        FeatureHasSlowFPVMLx]>;
 185
 186 // V6M Processors.
 187 def : Processor<"cortex-m0",        ARMV6Itineraries, [HasV6Ops, FeatureNoARM,
 188                                                        FeatureDB]>;
 189
 190 // V6T2 Processors.
 191 def : Processor<"arm1156t2-s",      ARMV6Itineraries, [HasV6T2Ops]>;
 192 def : Processor<"arm1156t2f-s",     ARMV6Itineraries, [HasV6T2Ops, FeatureVFP2,
 193                                                        FeatureHasSlowFPVMLx]>;
 194
 195 // V7a Processors.
 196 def : Processor<"cortex-a8",        CortexA8Itineraries,
 197                                     [ProcA8, HasV7Ops, FeatureNEON, FeatureDB,
 198                                      FeatureDSPThumb2]>;
 199 def : Processor<"cortex-a9",        CortexA9Itineraries,
 200                                     [ProcA9, HasV7Ops, FeatureNEON, FeatureDB,
 201                                      FeatureDSPThumb2]>;
 202 def : Processor<"cortex-a9-mp",     CortexA9Itineraries,
 203                                     [ProcA9, HasV7Ops, FeatureNEON, FeatureDB,
 204                                      FeatureDSPThumb2, FeatureMP]>;
 205
 206 // V7M Processors.
 207 def : ProcNoItin<"cortex-m3",       [HasV7Ops,
 208                                      FeatureThumb2, FeatureNoARM, FeatureDB,
 209                                      FeatureHWDiv]>;
 210
 211 // V7EM Processors.
 212 def : ProcNoItin<"cortex-m4",       [HasV7Ops,
 213                                      FeatureThumb2, FeatureNoARM, FeatureDB,
 214                                      FeatureHWDiv, FeatureDSPThumb2,
 215                                      FeatureT2XtPk, FeatureVFP2,
 216                                      FeatureVFPOnlySP]>;
 217
 218 //===----------------------------------------------------------------------===//
 219 // Register File Description
 220 //===----------------------------------------------------------------------===//
 221
 222 include "ARMRegisterInfo.td"
 223
 224 include "ARMCallingConv.td"
 225
 226 //===----------------------------------------------------------------------===//
 227 // Instruction Descriptions
 228 //===----------------------------------------------------------------------===//
 229
 230 include "ARMInstrInfo.td"
 231
 232 def ARMInstrInfo : InstrInfo;
 233
 234
 235 //===----------------------------------------------------------------------===//
 236 // Assembly printer
 237 //===----------------------------------------------------------------------===//
 238 // ARM Uses the MC printer for asm output, so make sure the TableGen
 239 // AsmWriter bits get associated with the correct class.
 240 def ARMAsmWriter : AsmWriter {
 241   string AsmWriterClassName  = "InstPrinter";
 242   bit isMCAsmWriter = 1;
 243 }
 244
 245 //===----------------------------------------------------------------------===//
 246 // Declare the target which we are implementing
 247 //===----------------------------------------------------------------------===//
 248
 249 def ARM : Target {
 250   // Pull in Instruction Info:
 251   let InstructionSet = ARMInstrInfo;
 252
 253   let AssemblyWriters = [ARMAsmWriter];
 254 }