1//==- AArch64SchedA53.td - Cortex-A53 Scheduling Definitions -*- tablegen -*-=// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This file defines the itinerary class data for the ARM Cortex A53 processors. 10// 11//===----------------------------------------------------------------------===// 12 13// ===---------------------------------------------------------------------===// 14// The following definitions describe the simpler per-operand machine model. 15// This works with MachineScheduler. See MCSchedule.h for details. 16 17// Cortex-A53 machine model for scheduling and other instruction cost heuristics. 18def CortexA53Model : SchedMachineModel { 19 let MicroOpBufferSize = 0; // Explicitly set to zero since A53 is in-order. 20 let IssueWidth = 2; // 2 micro-ops are dispatched per cycle. 21 let LoadLatency = 3; // Optimistic load latency assuming bypass. 22 // This is overriden by OperandCycles if the 23 // Itineraries are queried instead. 24 let MispredictPenalty = 9; // Based on "Cortex-A53 Software Optimisation 25 // Specification - Instruction Timings" 26 // v 1.0 Spreadsheet 27 let CompleteModel = 1; 28 29 list<Predicate> UnsupportedFeatures = SVEUnsupported.F; 30} 31 32 33//===----------------------------------------------------------------------===// 34// Define each kind of processor resource and number available. 35 36// Modeling each pipeline as a ProcResource using the BufferSize = 0 since 37// Cortex-A53 is in-order. 38 39def A53UnitALU : ProcResource<2> { let BufferSize = 0; } // Int ALU 40def A53UnitMAC : ProcResource<1> { let BufferSize = 0; } // Int MAC 41def A53UnitDiv : ProcResource<1> { let BufferSize = 0; } // Int Division 42def A53UnitLdSt : ProcResource<1> { let BufferSize = 0; } // Load/Store 43def A53UnitB : ProcResource<1> { let BufferSize = 0; } // Branch 44def A53UnitFPALU : ProcResource<1> { let BufferSize = 0; } // FP ALU 45def A53UnitFPMDS : ProcResource<1> { let BufferSize = 0; } // FP Mult/Div/Sqrt 46 47 48//===----------------------------------------------------------------------===// 49// Subtarget-specific SchedWrite types which both map the ProcResources and 50// set the latency. 51 52let SchedModel = CortexA53Model in { 53 54// ALU - Despite having a full latency of 4, most of the ALU instructions can 55// forward a cycle earlier and then two cycles earlier in the case of a 56// shift-only instruction. These latencies will be incorrect when the 57// result cannot be forwarded, but modeling isn't rocket surgery. 58def : WriteRes<WriteImm, [A53UnitALU]> { let Latency = 3; } 59def : WriteRes<WriteI, [A53UnitALU]> { let Latency = 3; } 60def : WriteRes<WriteISReg, [A53UnitALU]> { let Latency = 3; } 61def : WriteRes<WriteIEReg, [A53UnitALU]> { let Latency = 3; } 62def : WriteRes<WriteIS, [A53UnitALU]> { let Latency = 2; } 63def : WriteRes<WriteExtr, [A53UnitALU]> { let Latency = 3; } 64 65// MAC 66def : WriteRes<WriteIM32, [A53UnitMAC]> { let Latency = 4; } 67def : WriteRes<WriteIM64, [A53UnitMAC]> { let Latency = 4; } 68 69// Div 70def : WriteRes<WriteID32, [A53UnitDiv]> { let Latency = 4; } 71def : WriteRes<WriteID64, [A53UnitDiv]> { let Latency = 4; } 72 73// Load 74def : WriteRes<WriteLD, [A53UnitLdSt]> { let Latency = 4; } 75def : WriteRes<WriteLDIdx, [A53UnitLdSt]> { let Latency = 4; } 76def : WriteRes<WriteLDHi, [A53UnitLdSt]> { let Latency = 4; } 77 78// Vector Load - Vector loads take 1-5 cycles to issue. For the WriteVecLd 79// below, choosing the median of 3 which makes the latency 6. 80// May model this more carefully in the future. The remaining 81// A53WriteVLD# types represent the 1-5 cycle issues explicitly. 82def : WriteRes<WriteVLD, [A53UnitLdSt]> { let Latency = 6; 83 let ResourceCycles = [3]; } 84def A53WriteVLD1 : SchedWriteRes<[A53UnitLdSt]> { let Latency = 4; } 85def A53WriteVLD2 : SchedWriteRes<[A53UnitLdSt]> { let Latency = 5; 86 let ResourceCycles = [2]; } 87def A53WriteVLD3 : SchedWriteRes<[A53UnitLdSt]> { let Latency = 6; 88 let ResourceCycles = [3]; } 89def A53WriteVLD4 : SchedWriteRes<[A53UnitLdSt]> { let Latency = 7; 90 let ResourceCycles = [4]; } 91def A53WriteVLD5 : SchedWriteRes<[A53UnitLdSt]> { let Latency = 8; 92 let ResourceCycles = [5]; } 93 94// Pre/Post Indexing - Performed as part of address generation which is already 95// accounted for in the WriteST* latencies below 96def : WriteRes<WriteAdr, []> { let Latency = 0; } 97 98// Store 99def : WriteRes<WriteST, [A53UnitLdSt]> { let Latency = 4; } 100def : WriteRes<WriteSTP, [A53UnitLdSt]> { let Latency = 4; } 101def : WriteRes<WriteSTIdx, [A53UnitLdSt]> { let Latency = 4; } 102def : WriteRes<WriteSTX, [A53UnitLdSt]> { let Latency = 4; } 103 104// Vector Store - Similar to vector loads, can take 1-3 cycles to issue. 105def : WriteRes<WriteVST, [A53UnitLdSt]> { let Latency = 5; 106 let ResourceCycles = [2];} 107def A53WriteVST1 : SchedWriteRes<[A53UnitLdSt]> { let Latency = 4; } 108def A53WriteVST2 : SchedWriteRes<[A53UnitLdSt]> { let Latency = 5; 109 let ResourceCycles = [2]; } 110def A53WriteVST3 : SchedWriteRes<[A53UnitLdSt]> { let Latency = 6; 111 let ResourceCycles = [3]; } 112 113def : WriteRes<WriteAtomic, []> { let Unsupported = 1; } 114 115// Branch 116def : WriteRes<WriteBr, [A53UnitB]>; 117def : WriteRes<WriteBrReg, [A53UnitB]>; 118def : WriteRes<WriteSys, [A53UnitB]>; 119def : WriteRes<WriteBarrier, [A53UnitB]>; 120def : WriteRes<WriteHint, [A53UnitB]>; 121 122// FP ALU 123def : WriteRes<WriteF, [A53UnitFPALU]> { let Latency = 6; } 124def : WriteRes<WriteFCmp, [A53UnitFPALU]> { let Latency = 6; } 125def : WriteRes<WriteFCvt, [A53UnitFPALU]> { let Latency = 6; } 126def : WriteRes<WriteFCopy, [A53UnitFPALU]> { let Latency = 6; } 127def : WriteRes<WriteFImm, [A53UnitFPALU]> { let Latency = 6; } 128def : WriteRes<WriteV, [A53UnitFPALU]> { let Latency = 6; } 129 130// FP Mul, Div, Sqrt 131def : WriteRes<WriteFMul, [A53UnitFPMDS]> { let Latency = 6; } 132def : WriteRes<WriteFDiv, [A53UnitFPMDS]> { let Latency = 33; 133 let ResourceCycles = [29]; } 134def A53WriteFMAC : SchedWriteRes<[A53UnitFPMDS]> { let Latency = 10; } 135def A53WriteFDivSP : SchedWriteRes<[A53UnitFPMDS]> { let Latency = 18; 136 let ResourceCycles = [14]; } 137def A53WriteFDivDP : SchedWriteRes<[A53UnitFPMDS]> { let Latency = 33; 138 let ResourceCycles = [29]; } 139def A53WriteFSqrtSP : SchedWriteRes<[A53UnitFPMDS]> { let Latency = 17; 140 let ResourceCycles = [13]; } 141def A53WriteFSqrtDP : SchedWriteRes<[A53UnitFPMDS]> { let Latency = 32; 142 let ResourceCycles = [28]; } 143 144//===----------------------------------------------------------------------===// 145// Subtarget-specific SchedRead types. 146 147// No forwarding for these reads. 148def : ReadAdvance<ReadExtrHi, 0>; 149def : ReadAdvance<ReadAdrBase, 0>; 150def : ReadAdvance<ReadVLD, 0>; 151 152// ALU - Most operands in the ALU pipes are not needed for two cycles. Shiftable 153// operands are needed one cycle later if and only if they are to be 154// shifted. Otherwise, they too are needed two cycles later. This same 155// ReadAdvance applies to Extended registers as well, even though there is 156// a separate SchedPredicate for them. 157def : ReadAdvance<ReadI, 2, [WriteImm,WriteI, 158 WriteISReg, WriteIEReg,WriteIS, 159 WriteID32,WriteID64, 160 WriteIM32,WriteIM64]>; 161def A53ReadShifted : SchedReadAdvance<1, [WriteImm,WriteI, 162 WriteISReg, WriteIEReg,WriteIS, 163 WriteID32,WriteID64, 164 WriteIM32,WriteIM64]>; 165def A53ReadNotShifted : SchedReadAdvance<2, [WriteImm,WriteI, 166 WriteISReg, WriteIEReg,WriteIS, 167 WriteID32,WriteID64, 168 WriteIM32,WriteIM64]>; 169def A53ReadISReg : SchedReadVariant<[ 170 SchedVar<RegShiftedPred, [A53ReadShifted]>, 171 SchedVar<NoSchedPred, [A53ReadNotShifted]>]>; 172def : SchedAlias<ReadISReg, A53ReadISReg>; 173 174def A53ReadIEReg : SchedReadVariant<[ 175 SchedVar<RegExtendedPred, [A53ReadShifted]>, 176 SchedVar<NoSchedPred, [A53ReadNotShifted]>]>; 177def : SchedAlias<ReadIEReg, A53ReadIEReg>; 178 179// MAC - Operands are generally needed one cycle later in the MAC pipe. 180// Accumulator operands are needed two cycles later. 181def : ReadAdvance<ReadIM, 1, [WriteImm,WriteI, 182 WriteISReg, WriteIEReg,WriteIS, 183 WriteID32,WriteID64, 184 WriteIM32,WriteIM64]>; 185def : ReadAdvance<ReadIMA, 2, [WriteImm,WriteI, 186 WriteISReg, WriteIEReg,WriteIS, 187 WriteID32,WriteID64, 188 WriteIM32,WriteIM64]>; 189 190// Div 191def : ReadAdvance<ReadID, 1, [WriteImm,WriteI, 192 WriteISReg, WriteIEReg,WriteIS, 193 WriteID32,WriteID64, 194 WriteIM32,WriteIM64]>; 195 196//===----------------------------------------------------------------------===// 197// Subtarget-specific InstRWs. 198 199//--- 200// Miscellaneous 201//--- 202def : InstRW<[WriteI], (instrs COPY)>; 203 204//--- 205// Vector Loads 206//--- 207def : InstRW<[A53WriteVLD1], (instregex "LD1i(8|16|32|64)$")>; 208def : InstRW<[A53WriteVLD1], (instregex "LD1Rv(8b|4h|2s|1d|16b|8h|4s|2d)$")>; 209def : InstRW<[A53WriteVLD1], (instregex "LD1Onev(8b|4h|2s|1d|16b|8h|4s|2d)$")>; 210def : InstRW<[A53WriteVLD2], (instregex "LD1Twov(8b|4h|2s|1d|16b|8h|4s|2d)$")>; 211def : InstRW<[A53WriteVLD3], (instregex "LD1Threev(8b|4h|2s|1d|16b|8h|4s|2d)$")>; 212def : InstRW<[A53WriteVLD4], (instregex "LD1Fourv(8b|4h|2s|1d|16b|8h|4s|2d)$")>; 213def : InstRW<[A53WriteVLD1, WriteAdr], (instregex "LD1i(8|16|32|64)_POST$")>; 214def : InstRW<[A53WriteVLD1, WriteAdr], (instregex "LD1Rv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>; 215def : InstRW<[A53WriteVLD1, WriteAdr], (instregex "LD1Onev(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>; 216def : InstRW<[A53WriteVLD2, WriteAdr], (instregex "LD1Twov(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>; 217def : InstRW<[A53WriteVLD3, WriteAdr], (instregex "LD1Threev(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>; 218def : InstRW<[A53WriteVLD4, WriteAdr], (instregex "LD1Fourv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>; 219 220def : InstRW<[A53WriteVLD1], (instregex "LD2i(8|16|32|64)$")>; 221def : InstRW<[A53WriteVLD1], (instregex "LD2Rv(8b|4h|2s|1d|16b|8h|4s|2d)$")>; 222def : InstRW<[A53WriteVLD2], (instregex "LD2Twov(8b|4h|2s)$")>; 223def : InstRW<[A53WriteVLD4], (instregex "LD2Twov(16b|8h|4s|2d)$")>; 224def : InstRW<[A53WriteVLD1, WriteAdr], (instregex "LD2i(8|16|32|64)_POST$")>; 225def : InstRW<[A53WriteVLD1, WriteAdr], (instregex "LD2Rv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>; 226def : InstRW<[A53WriteVLD2, WriteAdr], (instregex "LD2Twov(8b|4h|2s)_POST$")>; 227def : InstRW<[A53WriteVLD4, WriteAdr], (instregex "LD2Twov(16b|8h|4s|2d)_POST$")>; 228 229def : InstRW<[A53WriteVLD2], (instregex "LD3i(8|16|32|64)$")>; 230def : InstRW<[A53WriteVLD2], (instregex "LD3Rv(8b|4h|2s|1d|16b|8h|4s|2d)$")>; 231def : InstRW<[A53WriteVLD4], (instregex "LD3Threev(8b|4h|2s|1d|16b|8h|4s)$")>; 232def : InstRW<[A53WriteVLD3], (instregex "LD3Threev2d$")>; 233def : InstRW<[A53WriteVLD2, WriteAdr], (instregex "LD3i(8|16|32|64)_POST$")>; 234def : InstRW<[A53WriteVLD2, WriteAdr], (instregex "LD3Rv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>; 235def : InstRW<[A53WriteVLD4, WriteAdr], (instregex "LD3Threev(8b|4h|2s|1d|16b|8h|4s)_POST$")>; 236def : InstRW<[A53WriteVLD3, WriteAdr], (instregex "LD3Threev2d_POST$")>; 237 238def : InstRW<[A53WriteVLD2], (instregex "LD4i(8|16|32|64)$")>; 239def : InstRW<[A53WriteVLD2], (instregex "LD4Rv(8b|4h|2s|1d|16b|8h|4s|2d)$")>; 240def : InstRW<[A53WriteVLD5], (instregex "LD4Fourv(8b|4h|2s|1d|16b|8h|4s)$")>; 241def : InstRW<[A53WriteVLD4], (instregex "LD4Fourv(2d)$")>; 242def : InstRW<[A53WriteVLD2, WriteAdr], (instregex "LD4i(8|16|32|64)_POST$")>; 243def : InstRW<[A53WriteVLD2, WriteAdr], (instregex "LD4Rv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>; 244def : InstRW<[A53WriteVLD5, WriteAdr], (instregex "LD4Fourv(8b|4h|2s|1d|16b|8h|4s)_POST$")>; 245def : InstRW<[A53WriteVLD4, WriteAdr], (instregex "LD4Fourv(2d)_POST$")>; 246 247//--- 248// Vector Stores 249//--- 250def : InstRW<[A53WriteVST1], (instregex "ST1i(8|16|32|64)$")>; 251def : InstRW<[A53WriteVST1], (instregex "ST1Onev(8b|4h|2s|1d|16b|8h|4s|2d)$")>; 252def : InstRW<[A53WriteVST1], (instregex "ST1Twov(8b|4h|2s|1d|16b|8h|4s|2d)$")>; 253def : InstRW<[A53WriteVST2], (instregex "ST1Threev(8b|4h|2s|1d|16b|8h|4s|2d)$")>; 254def : InstRW<[A53WriteVST2], (instregex "ST1Fourv(8b|4h|2s|1d|16b|8h|4s|2d)$")>; 255def : InstRW<[A53WriteVST1, WriteAdr], (instregex "ST1i(8|16|32|64)_POST$")>; 256def : InstRW<[A53WriteVST1, WriteAdr], (instregex "ST1Onev(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>; 257def : InstRW<[A53WriteVST1, WriteAdr], (instregex "ST1Twov(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>; 258def : InstRW<[A53WriteVST2, WriteAdr], (instregex "ST1Threev(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>; 259def : InstRW<[A53WriteVST2, WriteAdr], (instregex "ST1Fourv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>; 260 261def : InstRW<[A53WriteVST1], (instregex "ST2i(8|16|32|64)$")>; 262def : InstRW<[A53WriteVST1], (instregex "ST2Twov(8b|4h|2s)$")>; 263def : InstRW<[A53WriteVST2], (instregex "ST2Twov(16b|8h|4s|2d)$")>; 264def : InstRW<[A53WriteVST1, WriteAdr], (instregex "ST2i(8|16|32|64)_POST$")>; 265def : InstRW<[A53WriteVST1, WriteAdr], (instregex "ST2Twov(8b|4h|2s)_POST$")>; 266def : InstRW<[A53WriteVST2, WriteAdr], (instregex "ST2Twov(16b|8h|4s|2d)_POST$")>; 267 268def : InstRW<[A53WriteVST2], (instregex "ST3i(8|16|32|64)$")>; 269def : InstRW<[A53WriteVST3], (instregex "ST3Threev(8b|4h|2s|1d|16b|8h|4s)$")>; 270def : InstRW<[A53WriteVST2], (instregex "ST3Threev(2d)$")>; 271def : InstRW<[A53WriteVST2, WriteAdr], (instregex "ST3i(8|16|32|64)_POST$")>; 272def : InstRW<[A53WriteVST3, WriteAdr], (instregex "ST3Threev(8b|4h|2s|1d|16b|8h|4s)_POST$")>; 273def : InstRW<[A53WriteVST2, WriteAdr], (instregex "ST3Threev(2d)_POST$")>; 274 275def : InstRW<[A53WriteVST2], (instregex "ST4i(8|16|32|64)$")>; 276def : InstRW<[A53WriteVST3], (instregex "ST4Fourv(8b|4h|2s|1d|16b|8h|4s)$")>; 277def : InstRW<[A53WriteVST2], (instregex "ST4Fourv(2d)$")>; 278def : InstRW<[A53WriteVST2, WriteAdr], (instregex "ST4i(8|16|32|64)_POST$")>; 279def : InstRW<[A53WriteVST3, WriteAdr], (instregex "ST4Fourv(8b|4h|2s|1d|16b|8h|4s)_POST$")>; 280def : InstRW<[A53WriteVST2, WriteAdr], (instregex "ST4Fourv(2d)_POST$")>; 281 282//--- 283// Floating Point MAC, DIV, SQRT 284//--- 285def : InstRW<[A53WriteFMAC], (instregex "^FN?M(ADD|SUB).*")>; 286def : InstRW<[A53WriteFMAC], (instregex "^FML(A|S).*")>; 287def : InstRW<[A53WriteFDivSP], (instrs FDIVSrr)>; 288def : InstRW<[A53WriteFDivDP], (instrs FDIVDrr)>; 289def : InstRW<[A53WriteFDivSP], (instregex "^FDIVv.*32$")>; 290def : InstRW<[A53WriteFDivDP], (instregex "^FDIVv.*64$")>; 291def : InstRW<[A53WriteFSqrtSP], (instregex "^.*SQRT.*32$")>; 292def : InstRW<[A53WriteFSqrtDP], (instregex "^.*SQRT.*64$")>; 293 294} 295