296 lines
15 KiB
TableGen
296 lines
15 KiB
TableGen
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//==- AArch64SchedA53.td - Cortex-A53 Scheduling Definitions -*- tablegen -*-=//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the itinerary class data for the ARM Cortex A53 processors.
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//
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//===----------------------------------------------------------------------===//
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// ===---------------------------------------------------------------------===//
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// The following definitions describe the simpler per-operand machine model.
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// This works with MachineScheduler. See MCSchedule.h for details.
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// Cortex-A53 machine model for scheduling and other instruction cost heuristics.
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def CortexA53Model : SchedMachineModel {
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let MicroOpBufferSize = 0; // Explicitly set to zero since A53 is in-order.
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let IssueWidth = 2; // 2 micro-ops are dispatched per cycle.
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let LoadLatency = 3; // Optimistic load latency assuming bypass.
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// This is overriden by OperandCycles if the
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// Itineraries are queried instead.
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let MispredictPenalty = 9; // Based on "Cortex-A53 Software Optimisation
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// Specification - Instruction Timings"
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// v 1.0 Spreadsheet
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let CompleteModel = 1;
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list<Predicate> UnsupportedFeatures = !listconcat(SVEUnsupported.F,
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PAUnsupported.F);
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}
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//===----------------------------------------------------------------------===//
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// Define each kind of processor resource and number available.
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// Modeling each pipeline as a ProcResource using the BufferSize = 0 since
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// Cortex-A53 is in-order.
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def A53UnitALU : ProcResource<2> { let BufferSize = 0; } // Int ALU
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def A53UnitMAC : ProcResource<1> { let BufferSize = 0; } // Int MAC
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def A53UnitDiv : ProcResource<1> { let BufferSize = 0; } // Int Division
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def A53UnitLdSt : ProcResource<1> { let BufferSize = 0; } // Load/Store
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def A53UnitB : ProcResource<1> { let BufferSize = 0; } // Branch
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def A53UnitFPALU : ProcResource<1> { let BufferSize = 0; } // FP ALU
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def A53UnitFPMDS : ProcResource<1> { let BufferSize = 0; } // FP Mult/Div/Sqrt
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//===----------------------------------------------------------------------===//
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// Subtarget-specific SchedWrite types which both map the ProcResources and
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// set the latency.
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let SchedModel = CortexA53Model in {
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// ALU - Despite having a full latency of 4, most of the ALU instructions can
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// forward a cycle earlier and then two cycles earlier in the case of a
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// shift-only instruction. These latencies will be incorrect when the
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// result cannot be forwarded, but modeling isn't rocket surgery.
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def : WriteRes<WriteImm, [A53UnitALU]> { let Latency = 3; }
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def : WriteRes<WriteI, [A53UnitALU]> { let Latency = 3; }
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def : WriteRes<WriteISReg, [A53UnitALU]> { let Latency = 3; }
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def : WriteRes<WriteIEReg, [A53UnitALU]> { let Latency = 3; }
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def : WriteRes<WriteIS, [A53UnitALU]> { let Latency = 2; }
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def : WriteRes<WriteExtr, [A53UnitALU]> { let Latency = 3; }
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// MAC
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def : WriteRes<WriteIM32, [A53UnitMAC]> { let Latency = 4; }
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def : WriteRes<WriteIM64, [A53UnitMAC]> { let Latency = 4; }
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// Div
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def : WriteRes<WriteID32, [A53UnitDiv]> { let Latency = 4; }
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def : WriteRes<WriteID64, [A53UnitDiv]> { let Latency = 4; }
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// Load
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def : WriteRes<WriteLD, [A53UnitLdSt]> { let Latency = 4; }
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def : WriteRes<WriteLDIdx, [A53UnitLdSt]> { let Latency = 4; }
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def : WriteRes<WriteLDHi, [A53UnitLdSt]> { let Latency = 4; }
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// Vector Load - Vector loads take 1-5 cycles to issue. For the WriteVecLd
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// below, choosing the median of 3 which makes the latency 6.
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// May model this more carefully in the future. The remaining
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// A53WriteVLD# types represent the 1-5 cycle issues explicitly.
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def : WriteRes<WriteVLD, [A53UnitLdSt]> { let Latency = 6;
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let ResourceCycles = [3]; }
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def A53WriteVLD1 : SchedWriteRes<[A53UnitLdSt]> { let Latency = 4; }
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def A53WriteVLD2 : SchedWriteRes<[A53UnitLdSt]> { let Latency = 5;
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let ResourceCycles = [2]; }
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def A53WriteVLD3 : SchedWriteRes<[A53UnitLdSt]> { let Latency = 6;
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let ResourceCycles = [3]; }
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def A53WriteVLD4 : SchedWriteRes<[A53UnitLdSt]> { let Latency = 7;
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let ResourceCycles = [4]; }
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def A53WriteVLD5 : SchedWriteRes<[A53UnitLdSt]> { let Latency = 8;
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let ResourceCycles = [5]; }
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// Pre/Post Indexing - Performed as part of address generation which is already
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// accounted for in the WriteST* latencies below
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def : WriteRes<WriteAdr, []> { let Latency = 0; }
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// Store
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def : WriteRes<WriteST, [A53UnitLdSt]> { let Latency = 4; }
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def : WriteRes<WriteSTP, [A53UnitLdSt]> { let Latency = 4; }
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def : WriteRes<WriteSTIdx, [A53UnitLdSt]> { let Latency = 4; }
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def : WriteRes<WriteSTX, [A53UnitLdSt]> { let Latency = 4; }
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// Vector Store - Similar to vector loads, can take 1-3 cycles to issue.
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def : WriteRes<WriteVST, [A53UnitLdSt]> { let Latency = 5;
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let ResourceCycles = [2];}
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def A53WriteVST1 : SchedWriteRes<[A53UnitLdSt]> { let Latency = 4; }
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def A53WriteVST2 : SchedWriteRes<[A53UnitLdSt]> { let Latency = 5;
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let ResourceCycles = [2]; }
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def A53WriteVST3 : SchedWriteRes<[A53UnitLdSt]> { let Latency = 6;
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let ResourceCycles = [3]; }
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def : WriteRes<WriteAtomic, []> { let Unsupported = 1; }
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// Branch
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def : WriteRes<WriteBr, [A53UnitB]>;
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def : WriteRes<WriteBrReg, [A53UnitB]>;
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def : WriteRes<WriteSys, [A53UnitB]>;
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def : WriteRes<WriteBarrier, [A53UnitB]>;
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def : WriteRes<WriteHint, [A53UnitB]>;
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// FP ALU
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def : WriteRes<WriteF, [A53UnitFPALU]> { let Latency = 6; }
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def : WriteRes<WriteFCmp, [A53UnitFPALU]> { let Latency = 6; }
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def : WriteRes<WriteFCvt, [A53UnitFPALU]> { let Latency = 6; }
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def : WriteRes<WriteFCopy, [A53UnitFPALU]> { let Latency = 6; }
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def : WriteRes<WriteFImm, [A53UnitFPALU]> { let Latency = 6; }
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def : WriteRes<WriteV, [A53UnitFPALU]> { let Latency = 6; }
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// FP Mul, Div, Sqrt
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def : WriteRes<WriteFMul, [A53UnitFPMDS]> { let Latency = 6; }
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def : WriteRes<WriteFDiv, [A53UnitFPMDS]> { let Latency = 33;
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let ResourceCycles = [29]; }
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def A53WriteFMAC : SchedWriteRes<[A53UnitFPMDS]> { let Latency = 10; }
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def A53WriteFDivSP : SchedWriteRes<[A53UnitFPMDS]> { let Latency = 18;
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let ResourceCycles = [14]; }
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def A53WriteFDivDP : SchedWriteRes<[A53UnitFPMDS]> { let Latency = 33;
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let ResourceCycles = [29]; }
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def A53WriteFSqrtSP : SchedWriteRes<[A53UnitFPMDS]> { let Latency = 17;
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let ResourceCycles = [13]; }
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def A53WriteFSqrtDP : SchedWriteRes<[A53UnitFPMDS]> { let Latency = 32;
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let ResourceCycles = [28]; }
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//===----------------------------------------------------------------------===//
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// Subtarget-specific SchedRead types.
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// No forwarding for these reads.
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def : ReadAdvance<ReadExtrHi, 0>;
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def : ReadAdvance<ReadAdrBase, 0>;
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def : ReadAdvance<ReadVLD, 0>;
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// ALU - Most operands in the ALU pipes are not needed for two cycles. Shiftable
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// operands are needed one cycle later if and only if they are to be
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// shifted. Otherwise, they too are needed two cycles later. This same
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// ReadAdvance applies to Extended registers as well, even though there is
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// a separate SchedPredicate for them.
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def : ReadAdvance<ReadI, 2, [WriteImm,WriteI,
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WriteISReg, WriteIEReg,WriteIS,
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WriteID32,WriteID64,
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WriteIM32,WriteIM64]>;
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def A53ReadShifted : SchedReadAdvance<1, [WriteImm,WriteI,
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WriteISReg, WriteIEReg,WriteIS,
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WriteID32,WriteID64,
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WriteIM32,WriteIM64]>;
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def A53ReadNotShifted : SchedReadAdvance<2, [WriteImm,WriteI,
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WriteISReg, WriteIEReg,WriteIS,
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WriteID32,WriteID64,
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WriteIM32,WriteIM64]>;
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def A53ReadISReg : SchedReadVariant<[
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SchedVar<RegShiftedPred, [A53ReadShifted]>,
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SchedVar<NoSchedPred, [A53ReadNotShifted]>]>;
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def : SchedAlias<ReadISReg, A53ReadISReg>;
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def A53ReadIEReg : SchedReadVariant<[
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SchedVar<RegExtendedPred, [A53ReadShifted]>,
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SchedVar<NoSchedPred, [A53ReadNotShifted]>]>;
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def : SchedAlias<ReadIEReg, A53ReadIEReg>;
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// MAC - Operands are generally needed one cycle later in the MAC pipe.
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// Accumulator operands are needed two cycles later.
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def : ReadAdvance<ReadIM, 1, [WriteImm,WriteI,
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WriteISReg, WriteIEReg,WriteIS,
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WriteID32,WriteID64,
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WriteIM32,WriteIM64]>;
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def : ReadAdvance<ReadIMA, 2, [WriteImm,WriteI,
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WriteISReg, WriteIEReg,WriteIS,
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WriteID32,WriteID64,
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WriteIM32,WriteIM64]>;
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// Div
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def : ReadAdvance<ReadID, 1, [WriteImm,WriteI,
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WriteISReg, WriteIEReg,WriteIS,
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WriteID32,WriteID64,
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WriteIM32,WriteIM64]>;
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//===----------------------------------------------------------------------===//
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// Subtarget-specific InstRWs.
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//---
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// Miscellaneous
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//---
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def : InstRW<[WriteI], (instrs COPY)>;
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//---
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// Vector Loads
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//---
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def : InstRW<[A53WriteVLD1], (instregex "LD1i(8|16|32|64)$")>;
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def : InstRW<[A53WriteVLD1], (instregex "LD1Rv(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
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def : InstRW<[A53WriteVLD1], (instregex "LD1Onev(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
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def : InstRW<[A53WriteVLD2], (instregex "LD1Twov(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
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def : InstRW<[A53WriteVLD3], (instregex "LD1Threev(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
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def : InstRW<[A53WriteVLD4], (instregex "LD1Fourv(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
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def : InstRW<[A53WriteVLD1, WriteAdr], (instregex "LD1i(8|16|32|64)_POST$")>;
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def : InstRW<[A53WriteVLD1, WriteAdr], (instregex "LD1Rv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
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def : InstRW<[A53WriteVLD1, WriteAdr], (instregex "LD1Onev(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
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def : InstRW<[A53WriteVLD2, WriteAdr], (instregex "LD1Twov(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
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def : InstRW<[A53WriteVLD3, WriteAdr], (instregex "LD1Threev(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
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def : InstRW<[A53WriteVLD4, WriteAdr], (instregex "LD1Fourv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
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def : InstRW<[A53WriteVLD1], (instregex "LD2i(8|16|32|64)$")>;
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def : InstRW<[A53WriteVLD1], (instregex "LD2Rv(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
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def : InstRW<[A53WriteVLD2], (instregex "LD2Twov(8b|4h|2s)$")>;
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def : InstRW<[A53WriteVLD4], (instregex "LD2Twov(16b|8h|4s|2d)$")>;
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def : InstRW<[A53WriteVLD1, WriteAdr], (instregex "LD2i(8|16|32|64)_POST$")>;
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def : InstRW<[A53WriteVLD1, WriteAdr], (instregex "LD2Rv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
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def : InstRW<[A53WriteVLD2, WriteAdr], (instregex "LD2Twov(8b|4h|2s)_POST$")>;
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def : InstRW<[A53WriteVLD4, WriteAdr], (instregex "LD2Twov(16b|8h|4s|2d)_POST$")>;
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def : InstRW<[A53WriteVLD2], (instregex "LD3i(8|16|32|64)$")>;
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def : InstRW<[A53WriteVLD2], (instregex "LD3Rv(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
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def : InstRW<[A53WriteVLD4], (instregex "LD3Threev(8b|4h|2s|1d|16b|8h|4s)$")>;
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def : InstRW<[A53WriteVLD3], (instregex "LD3Threev2d$")>;
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def : InstRW<[A53WriteVLD2, WriteAdr], (instregex "LD3i(8|16|32|64)_POST$")>;
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def : InstRW<[A53WriteVLD2, WriteAdr], (instregex "LD3Rv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
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def : InstRW<[A53WriteVLD4, WriteAdr], (instregex "LD3Threev(8b|4h|2s|1d|16b|8h|4s)_POST$")>;
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def : InstRW<[A53WriteVLD3, WriteAdr], (instregex "LD3Threev2d_POST$")>;
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def : InstRW<[A53WriteVLD2], (instregex "LD4i(8|16|32|64)$")>;
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def : InstRW<[A53WriteVLD2], (instregex "LD4Rv(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
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def : InstRW<[A53WriteVLD5], (instregex "LD4Fourv(8b|4h|2s|1d|16b|8h|4s)$")>;
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def : InstRW<[A53WriteVLD4], (instregex "LD4Fourv(2d)$")>;
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def : InstRW<[A53WriteVLD2, WriteAdr], (instregex "LD4i(8|16|32|64)_POST$")>;
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def : InstRW<[A53WriteVLD2, WriteAdr], (instregex "LD4Rv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
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def : InstRW<[A53WriteVLD5, WriteAdr], (instregex "LD4Fourv(8b|4h|2s|1d|16b|8h|4s)_POST$")>;
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def : InstRW<[A53WriteVLD4, WriteAdr], (instregex "LD4Fourv(2d)_POST$")>;
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//---
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// Vector Stores
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//---
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def : InstRW<[A53WriteVST1], (instregex "ST1i(8|16|32|64)$")>;
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def : InstRW<[A53WriteVST1], (instregex "ST1Onev(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
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def : InstRW<[A53WriteVST1], (instregex "ST1Twov(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
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def : InstRW<[A53WriteVST2], (instregex "ST1Threev(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
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def : InstRW<[A53WriteVST2], (instregex "ST1Fourv(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
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def : InstRW<[A53WriteVST1, WriteAdr], (instregex "ST1i(8|16|32|64)_POST$")>;
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def : InstRW<[A53WriteVST1, WriteAdr], (instregex "ST1Onev(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
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def : InstRW<[A53WriteVST1, WriteAdr], (instregex "ST1Twov(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
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def : InstRW<[A53WriteVST2, WriteAdr], (instregex "ST1Threev(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
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def : InstRW<[A53WriteVST2, WriteAdr], (instregex "ST1Fourv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
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def : InstRW<[A53WriteVST1], (instregex "ST2i(8|16|32|64)$")>;
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def : InstRW<[A53WriteVST1], (instregex "ST2Twov(8b|4h|2s)$")>;
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def : InstRW<[A53WriteVST2], (instregex "ST2Twov(16b|8h|4s|2d)$")>;
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def : InstRW<[A53WriteVST1, WriteAdr], (instregex "ST2i(8|16|32|64)_POST$")>;
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def : InstRW<[A53WriteVST1, WriteAdr], (instregex "ST2Twov(8b|4h|2s)_POST$")>;
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def : InstRW<[A53WriteVST2, WriteAdr], (instregex "ST2Twov(16b|8h|4s|2d)_POST$")>;
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def : InstRW<[A53WriteVST2], (instregex "ST3i(8|16|32|64)$")>;
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def : InstRW<[A53WriteVST3], (instregex "ST3Threev(8b|4h|2s|1d|16b|8h|4s)$")>;
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def : InstRW<[A53WriteVST2], (instregex "ST3Threev(2d)$")>;
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def : InstRW<[A53WriteVST2, WriteAdr], (instregex "ST3i(8|16|32|64)_POST$")>;
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def : InstRW<[A53WriteVST3, WriteAdr], (instregex "ST3Threev(8b|4h|2s|1d|16b|8h|4s)_POST$")>;
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def : InstRW<[A53WriteVST2, WriteAdr], (instregex "ST3Threev(2d)_POST$")>;
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def : InstRW<[A53WriteVST2], (instregex "ST4i(8|16|32|64)$")>;
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def : InstRW<[A53WriteVST3], (instregex "ST4Fourv(8b|4h|2s|1d|16b|8h|4s)$")>;
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def : InstRW<[A53WriteVST2], (instregex "ST4Fourv(2d)$")>;
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def : InstRW<[A53WriteVST2, WriteAdr], (instregex "ST4i(8|16|32|64)_POST$")>;
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def : InstRW<[A53WriteVST3, WriteAdr], (instregex "ST4Fourv(8b|4h|2s|1d|16b|8h|4s)_POST$")>;
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def : InstRW<[A53WriteVST2, WriteAdr], (instregex "ST4Fourv(2d)_POST$")>;
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//---
|
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// Floating Point MAC, DIV, SQRT
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//---
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def : InstRW<[A53WriteFMAC], (instregex "^FN?M(ADD|SUB).*")>;
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def : InstRW<[A53WriteFMAC], (instregex "^FML(A|S).*")>;
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def : InstRW<[A53WriteFDivSP], (instrs FDIVSrr)>;
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def : InstRW<[A53WriteFDivDP], (instrs FDIVDrr)>;
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def : InstRW<[A53WriteFDivSP], (instregex "^FDIVv.*32$")>;
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def : InstRW<[A53WriteFDivDP], (instregex "^FDIVv.*64$")>;
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def : InstRW<[A53WriteFSqrtSP], (instregex "^.*SQRT.*32$")>;
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def : InstRW<[A53WriteFSqrtDP], (instregex "^.*SQRT.*64$")>;
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||
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}
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