[llvm] 4b8ade8 - [AArch64] Cortex-A55 scheduler model
Sjoerd Meijer via llvm-commits
llvm-commits at lists.llvm.org
Mon Sep 21 02:55:17 PDT 2020
Author: Sjoerd Meijer
Date: 2020-09-21T10:54:32+01:00
New Revision: 4b8ade837e36b7f0181ce86fc23f33851d0fdd35
URL: https://github.com/llvm/llvm-project/commit/4b8ade837e36b7f0181ce86fc23f33851d0fdd35
DIFF: https://github.com/llvm/llvm-project/commit/4b8ade837e36b7f0181ce86fc23f33851d0fdd35.diff
LOG: [AArch64] Cortex-A55 scheduler model
This is an initial commit adding the A55 model, but it isn't used/enabled yet.
We will follow up on this to improve the model, then flip the switch.
The optimisation guide describing Cortex-A55 micro-architecture in more detail
can be found here:
https://static.docs.arm.com/epm128372/20/arm_cortex_a55_software_optimization_guide_v2.pdf
Original patch by Javed Absar.
Differential Revision: https://reviews.llvm.org/D46884
Added:
llvm/lib/Target/AArch64/AArch64SchedA55.td
Modified:
llvm/lib/Target/AArch64/AArch64.td
Removed:
################################################################################
diff --git a/llvm/lib/Target/AArch64/AArch64.td b/llvm/lib/Target/AArch64/AArch64.td
index 534af9686af0..4f4bd9bbd98f 100644
--- a/llvm/lib/Target/AArch64/AArch64.td
+++ b/llvm/lib/Target/AArch64/AArch64.td
@@ -998,7 +998,11 @@ def : ProcessorModel<"generic", NoSchedModel, [
def : ProcessorModel<"cortex-a35", CortexA53Model, [ProcA35]>;
def : ProcessorModel<"cortex-a34", CortexA53Model, [ProcA35]>;
def : ProcessorModel<"cortex-a53", CortexA53Model, [ProcA53]>;
+
+// FIXME: the A55 model (see AArch64SchedA55.td) needs some improvements, so
+// use the A53 model for now.
def : ProcessorModel<"cortex-a55", CortexA53Model, [ProcA55]>;
+
def : ProcessorModel<"cortex-a57", CortexA57Model, [ProcA57]>;
def : ProcessorModel<"cortex-a65", CortexA53Model, [ProcA65]>;
def : ProcessorModel<"cortex-a65ae", CortexA53Model, [ProcA65]>;
diff --git a/llvm/lib/Target/AArch64/AArch64SchedA55.td b/llvm/lib/Target/AArch64/AArch64SchedA55.td
new file mode 100644
index 000000000000..d75458b709bc
--- /dev/null
+++ b/llvm/lib/Target/AArch64/AArch64SchedA55.td
@@ -0,0 +1,332 @@
+//==- AArch64SchedCortexA55.td - ARM Cortex-A55 Scheduling Definitions -*- tablegen -*-=//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the machine model for the ARM Cortex-A55 processors.
+//
+//===----------------------------------------------------------------------===//
+
+// ===---------------------------------------------------------------------===//
+// The following definitions describe the per-operand machine model.
+// This works with MachineScheduler. See MCSchedModel.h for details.
+
+// Cortex-A55 machine model for scheduling and other instruction cost heuristics.
+def CortexA55Model : SchedMachineModel {
+ let MicroOpBufferSize = 0; // The Cortex-A55 is an in-order processor
+ let IssueWidth = 2; // It dual-issues under most circumstances
+ let LoadLatency = 4; // Cycles for loads to access the cache. The
+ // optimisation guide shows that most loads have
+ // a latency of 3, but some have a latency of 4
+ // or 5. Setting it 4 looked to be good trade-off.
+ let MispredictPenalty = 8; // A branch direction mispredict.
+ let PostRAScheduler = 1; // Enable PostRA scheduler pass.
+ let CompleteModel = 0; // Covers instructions applicable to Cortex-A55.
+
+ list<Predicate> UnsupportedFeatures = [HasSVE];
+
+ // FIXME: Remove when all errors have been fixed.
+ let FullInstRWOverlapCheck = 0;
+}
+
+//===----------------------------------------------------------------------===//
+// Define each kind of processor resource and number available.
+
+// Modeling each pipeline as a ProcResource using the BufferSize = 0 since the
+// Cortex-A55 is in-order.
+
+def CortexA55UnitALU : ProcResource<2> { let BufferSize = 0; } // Int ALU
+def CortexA55UnitMAC : ProcResource<1> { let BufferSize = 0; } // Int MAC, 64-bi wide
+def CortexA55UnitDiv : ProcResource<1> { let BufferSize = 0; } // Int Division, not pipelined
+def CortexA55UnitLd : ProcResource<1> { let BufferSize = 0; } // Load pipe
+def CortexA55UnitSt : ProcResource<1> { let BufferSize = 0; } // Store pipe
+def CortexA55UnitB : ProcResource<1> { let BufferSize = 0; } // Branch
+
+// The FP DIV/SQRT instructions execute totally
diff erently from the FP ALU
+// instructions, which can mostly be dual-issued; that's why for now we model
+// them with 2 resources.
+def CortexA55UnitFPALU : ProcResource<2> { let BufferSize = 0; } // FP ALU
+def CortexA55UnitFPMAC : ProcResource<2> { let BufferSize = 0; } // FP MAC
+def CortexA55UnitFPDIV : ProcResource<1> { let BufferSize = 0; } // FP Div/SQRT, 64/128
+
+//===----------------------------------------------------------------------===//
+// Subtarget-specific SchedWrite types
+
+let SchedModel = CortexA55Model in {
+
+// These latencies are modeled without taking into account forwarding paths
+// (the software optimisation guide lists latencies taking into account
+// typical forwarding paths).
+def : WriteRes<WriteImm, [CortexA55UnitALU]> { let Latency = 3; } // MOVN, MOVZ
+def : WriteRes<WriteI, [CortexA55UnitALU]> { let Latency = 3; } // ALU
+def : WriteRes<WriteISReg, [CortexA55UnitALU]> { let Latency = 3; } // ALU of Shifted-Reg
+def : WriteRes<WriteIEReg, [CortexA55UnitALU]> { let Latency = 3; } // ALU of Extended-Reg
+def : WriteRes<WriteExtr, [CortexA55UnitALU]> { let Latency = 3; } // EXTR from a reg pair
+def : WriteRes<WriteIS, [CortexA55UnitALU]> { let Latency = 3; } // Shift/Scale
+
+// MAC
+def : WriteRes<WriteIM32, [CortexA55UnitMAC]> { let Latency = 4; } // 32-bit Multiply
+def : WriteRes<WriteIM64, [CortexA55UnitMAC]> { let Latency = 4; } // 64-bit Multiply
+
+// Div
+def : WriteRes<WriteID32, [CortexA55UnitDiv]> {
+ let Latency = 8; let ResourceCycles = [8];
+}
+def : WriteRes<WriteID64, [CortexA55UnitDiv]> {
+ let Latency = 8; let ResourceCycles = [8];
+}
+
+// Load
+def : WriteRes<WriteLD, [CortexA55UnitLd]> { let Latency = 4; }
+def : WriteRes<WriteLDIdx, [CortexA55UnitLd]> { let Latency = 4; }
+def : WriteRes<WriteLDHi, [CortexA55UnitLd]> { let Latency = 5; }
+
+// Vector Load - Vector loads take 1-5 cycles to issue. For the WriteVecLd
+// below, choosing the median of 3 which makes the latency 6.
+// An extra cycle is needed to get the swizzling right.
+def : WriteRes<WriteVLD, [CortexA55UnitLd]> { let Latency = 6;
+ let ResourceCycles = [3]; }
+def CortexA55WriteVLD1 : SchedWriteRes<[CortexA55UnitLd]> { let Latency = 4; }
+def CortexA55WriteVLD2 : SchedWriteRes<[CortexA55UnitLd]> { let Latency = 5;
+ let ResourceCycles = [2]; }
+def CortexA55WriteVLD3 : SchedWriteRes<[CortexA55UnitLd]> { let Latency = 6;
+ let ResourceCycles = [3]; }
+def CortexA55WriteVLD4 : SchedWriteRes<[CortexA55UnitLd]> { let Latency = 7;
+ let ResourceCycles = [4]; }
+def CortexA55WriteVLD5 : SchedWriteRes<[CortexA55UnitLd]> { let Latency = 8;
+ let ResourceCycles = [5]; }
+def CortexA55WriteVLD6 : SchedWriteRes<[CortexA55UnitLd]> { let Latency = 9;
+ let ResourceCycles = [6]; }
+def CortexA55WriteVLD7 : SchedWriteRes<[CortexA55UnitLd]> { let Latency = 10;
+ let ResourceCycles = [7]; }
+def CortexA55WriteVLD8 : SchedWriteRes<[CortexA55UnitLd]> { let Latency = 11;
+ let ResourceCycles = [8]; }
+
+// Pre/Post Indexing - Performed as part of address generation
+def : WriteRes<WriteAdr, []> { let Latency = 0; }
+
+// Store
+def : WriteRes<WriteST, [CortexA55UnitSt]> { let Latency = 4; }
+def : WriteRes<WriteSTP, [CortexA55UnitSt]> { let Latency = 4; }
+def : WriteRes<WriteSTIdx, [CortexA55UnitSt]> { let Latency = 4; }
+def : WriteRes<WriteSTX, [CortexA55UnitSt]> { let Latency = 4; }
+
+// Vector Store - Similar to vector loads, can take 1-3 cycles to issue.
+def : WriteRes<WriteVST, [CortexA55UnitSt]> { let Latency = 5;
+ let ResourceCycles = [2];}
+def CortexA55WriteVST1 : SchedWriteRes<[CortexA55UnitSt]> { let Latency = 4; }
+def CortexA55WriteVST2 : SchedWriteRes<[CortexA55UnitSt]> { let Latency = 5;
+ let ResourceCycles = [2]; }
+def CortexA55WriteVST3 : SchedWriteRes<[CortexA55UnitSt]> { let Latency = 6;
+ let ResourceCycles = [3]; }
+def CortexA55WriteVST4 : SchedWriteRes<[CortexA55UnitSt]> { let Latency = 5;
+ let ResourceCycles = [4]; }
+
+def : WriteRes<WriteAtomic, []> { let Unsupported = 1; }
+
+// Branch
+def : WriteRes<WriteBr, [CortexA55UnitB]>;
+def : WriteRes<WriteBrReg, [CortexA55UnitB]>;
+def : WriteRes<WriteSys, [CortexA55UnitB]>;
+def : WriteRes<WriteBarrier, [CortexA55UnitB]>;
+def : WriteRes<WriteHint, [CortexA55UnitB]>;
+
+// FP ALU
+// As WriteF result is produced in F5 and it can be mostly forwarded
+// to consumer at F1, the effectively latency is set as 4.
+def : WriteRes<WriteF, [CortexA55UnitFPALU]> { let Latency = 4; }
+def : WriteRes<WriteFCmp, [CortexA55UnitFPALU]> { let Latency = 3; }
+def : WriteRes<WriteFCvt, [CortexA55UnitFPALU]> { let Latency = 4; }
+def : WriteRes<WriteFCopy, [CortexA55UnitFPALU]> { let Latency = 3; }
+def : WriteRes<WriteFImm, [CortexA55UnitFPALU]> { let Latency = 3; }
+def : WriteRes<WriteV, [CortexA55UnitFPALU]> { let Latency = 4; }
+
+// FP ALU specific new schedwrite definitions
+def CortexA55WriteFPALU_F3 : SchedWriteRes<[CortexA55UnitFPALU]> { let Latency = 3;}
+def CortexA55WriteFPALU_F4 : SchedWriteRes<[CortexA55UnitFPALU]> { let Latency = 4;}
+def CortexA55WriteFPALU_F5 : SchedWriteRes<[CortexA55UnitFPALU]> { let Latency = 5;}
+
+// FP Mul, Div, Sqrt. Div/Sqrt are not pipelined
+def : WriteRes<WriteFMul, [CortexA55UnitFPMAC]> { let Latency = 4; }
+def : WriteRes<WriteFDiv, [CortexA55UnitFPDIV]> { let Latency = 21;
+ let ResourceCycles = [29]; }
+def CortexA55WriteFMAC : SchedWriteRes<[CortexA55UnitFPMAC]> { let Latency = 4; }
+def CortexA55WriteFDivSP : SchedWriteRes<[CortexA55UnitFPDIV]> { let Latency = 18;
+ let ResourceCycles = [14]; }
+def CortexA55WriteFDivDP : SchedWriteRes<[CortexA55UnitFPDIV]> { let Latency = 33;
+ let ResourceCycles = [29]; }
+def CortexA55WriteFSqrtSP : SchedWriteRes<[CortexA55UnitFPDIV]> { let Latency = 17;
+ let ResourceCycles = [13]; }
+def CortexA55WriteFSqrtDP : SchedWriteRes<[CortexA55UnitFPDIV]> { let Latency = 32;
+ let ResourceCycles = [28]; }
+
+//===----------------------------------------------------------------------===//
+// Subtarget-specific SchedRead types.
+
+def : ReadAdvance<ReadVLD, 0>;
+def : ReadAdvance<ReadExtrHi, 1>;
+def : ReadAdvance<ReadAdrBase, 1>;
+
+// ALU - ALU input operands are generally needed in EX1. An operand produced in
+// in say EX2 can be forwarded for consumption to ALU in EX1, thereby
+// allowing back-to-back ALU operations such as add. If an operand requires
+// a shift, it will, however, be required in ISS stage.
+def : ReadAdvance<ReadI, 2, [WriteImm,WriteI,
+ WriteISReg, WriteIEReg,WriteIS,
+ WriteID32,WriteID64,
+ WriteIM32,WriteIM64]>;
+// Shifted operand
+def CortexA55ReadShifted : SchedReadAdvance<1, [WriteImm,WriteI,
+ WriteISReg, WriteIEReg,WriteIS,
+ WriteID32,WriteID64,
+ WriteIM32,WriteIM64]>;
+def CortexA55ReadNotShifted : SchedReadAdvance<2, [WriteImm,WriteI,
+ WriteISReg, WriteIEReg,WriteIS,
+ WriteID32,WriteID64,
+ WriteIM32,WriteIM64]>;
+def CortexA55ReadISReg : SchedReadVariant<[
+ SchedVar<RegShiftedPred, [CortexA55ReadShifted]>,
+ SchedVar<NoSchedPred, [CortexA55ReadNotShifted]>]>;
+def : SchedAlias<ReadISReg, CortexA55ReadISReg>;
+
+def CortexA55ReadIEReg : SchedReadVariant<[
+ SchedVar<RegExtendedPred, [CortexA55ReadShifted]>,
+ SchedVar<NoSchedPred, [CortexA55ReadNotShifted]>]>;
+def : SchedAlias<ReadIEReg, CortexA55ReadIEReg>;
+
+// MUL
+def : ReadAdvance<ReadIM, 1, [WriteImm,WriteI,
+ WriteISReg, WriteIEReg,WriteIS,
+ WriteID32,WriteID64,
+ WriteIM32,WriteIM64]>;
+def : ReadAdvance<ReadIMA, 2, [WriteImm,WriteI,
+ WriteISReg, WriteIEReg,WriteIS,
+ WriteID32,WriteID64,
+ WriteIM32,WriteIM64]>;
+
+// Div
+def : ReadAdvance<ReadID, 1, [WriteImm,WriteI,
+ WriteISReg, WriteIEReg,WriteIS,
+ WriteID32,WriteID64,
+ WriteIM32,WriteIM64]>;
+
+//===----------------------------------------------------------------------===//
+// Subtarget-specific InstRWs.
+
+//---
+// Miscellaneous
+//---
+def : InstRW<[CortexA55WriteVLD2,CortexA55WriteVLD1], (instregex "LDP.*")>;
+def : InstRW<[WriteI], (instrs COPY)>;
+//---
+// Vector Loads - 64-bit per cycle
+//---
+// 1-element structures
+def : InstRW<[CortexA55WriteVLD1], (instregex "LD1i(8|16|32|64)$")>; // single element
+def : InstRW<[CortexA55WriteVLD1], (instregex "LD1Rv(8b|4h|2s|1d|16b|8h|4s|2d)$")>; // replicate
+def : InstRW<[CortexA55WriteVLD1], (instregex "LD1Onev(8b|4h|2s|1d)$")>;
+def : InstRW<[CortexA55WriteVLD2], (instregex "LD1Onev(16b|8h|4s|2d)$")>;
+def : InstRW<[CortexA55WriteVLD2], (instregex "LD1Twov(8b|4h|2s|1d)$")>; // multiple structures
+def : InstRW<[CortexA55WriteVLD4], (instregex "LD1Twov(16b|8h|4s|2d)$")>;
+def : InstRW<[CortexA55WriteVLD3], (instregex "LD1Threev(8b|4h|2s|1d)$")>;
+def : InstRW<[CortexA55WriteVLD6], (instregex "LD1Threev(16b|8h|4s|2d)$")>;
+def : InstRW<[CortexA55WriteVLD4], (instregex "LD1Fourv(8b|4h|2s|1d)$")>;
+def : InstRW<[CortexA55WriteVLD8], (instregex "LD1Fourv(16b|8h|4s|2d)$")>;
+
+def : InstRW<[CortexA55WriteVLD1, WriteAdr], (instregex "LD1i(8|16|32|64)_POST$")>;
+def : InstRW<[CortexA55WriteVLD1, WriteAdr], (instregex "LD1Rv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
+def : InstRW<[CortexA55WriteVLD1, WriteAdr], (instregex "LD1Onev(8b|4h|2s|1d)_POST$")>;
+def : InstRW<[CortexA55WriteVLD2, WriteAdr], (instregex "LD1Onev(16b|8h|4s|2d)_POST$")>;
+def : InstRW<[CortexA55WriteVLD2, WriteAdr], (instregex "LD1Twov(8b|4h|2s|1d)_POST$")>;
+def : InstRW<[CortexA55WriteVLD4, WriteAdr], (instregex "LD1Twov(16b|8h|4s|2d)_POST$")>;
+def : InstRW<[CortexA55WriteVLD3, WriteAdr], (instregex "LD1Threev(8b|4h|2s|1d)_POST$")>;
+def : InstRW<[CortexA55WriteVLD6, WriteAdr], (instregex "LD1Threev(16b|8h|4s|2d)_POST$")>;
+def : InstRW<[CortexA55WriteVLD4, WriteAdr], (instregex "LD1Fourv(8b|4h|2s|1d)_POST$")>;
+def : InstRW<[CortexA55WriteVLD8, WriteAdr], (instregex "LD1Fourv(16b|8h|4s|2d)_POST$")>;
+
+// 2-element structures
+def : InstRW<[CortexA55WriteVLD2], (instregex "LD2i(8|16|32|64)$")>;
+def : InstRW<[CortexA55WriteVLD2], (instregex "LD2Rv(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
+def : InstRW<[CortexA55WriteVLD2], (instregex "LD2Twov(8b|4h|2s)$")>;
+def : InstRW<[CortexA55WriteVLD4], (instregex "LD2Twov(16b|8h|4s|2d)$")>;
+
+def : InstRW<[CortexA55WriteVLD2, WriteAdr], (instregex "LD2i(8|16|32|64)(_POST)?$")>;
+def : InstRW<[CortexA55WriteVLD2, WriteAdr], (instregex "LD2Rv(8b|4h|2s|1d|16b|8h|4s|2d)(_POST)?$")>;
+def : InstRW<[CortexA55WriteVLD2, WriteAdr], (instregex "LD2Twov(8b|4h|2s)(_POST)?$")>;
+def : InstRW<[CortexA55WriteVLD4, WriteAdr], (instregex "LD2Twov(16b|8h|4s|2d)(_POST)?$")>;
+
+// 3-element structures
+def : InstRW<[CortexA55WriteVLD2], (instregex "LD3i(8|16|32|64)$")>;
+def : InstRW<[CortexA55WriteVLD2], (instregex "LD3Rv(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
+def : InstRW<[CortexA55WriteVLD3], (instregex "LD3Threev(8b|4h|2s|1d)$")>;
+def : InstRW<[CortexA55WriteVLD6], (instregex "LD3Threev(16b|8h|4s|2d)$")>;
+
+def : InstRW<[CortexA55WriteVLD2, WriteAdr], (instregex "LD3i(8|16|32|64)_POST$")>;
+def : InstRW<[CortexA55WriteVLD2, WriteAdr], (instregex "LD3Rv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
+def : InstRW<[CortexA55WriteVLD3, WriteAdr], (instregex "LD3Threev(8b|4h|2s|1d)_POST$")>;
+def : InstRW<[CortexA55WriteVLD6, WriteAdr], (instregex "LD3Threev(16b|8h|4s|2d)_POST$")>;
+
+// 4-element structures
+def : InstRW<[CortexA55WriteVLD2], (instregex "LD4i(8|16|32|64)$")>; // load single 4-el structure to one lane of 4 regs.
+def : InstRW<[CortexA55WriteVLD2], (instregex "LD4Rv(8b|4h|2s|1d|16b|8h|4s|2d)$")>; // load single 4-el structure, replicate to all lanes of 4 regs.
+def : InstRW<[CortexA55WriteVLD4], (instregex "LD4Fourv(8b|4h|2s|1d)$")>; // load multiple 4-el structures to 4 regs.
+def : InstRW<[CortexA55WriteVLD8], (instregex "LD4Fourv(16b|8h|4s|2d)$")>;
+
+def : InstRW<[CortexA55WriteVLD2, WriteAdr], (instregex "LD4i(8|16|32|64)_POST$")>;
+def : InstRW<[CortexA55WriteVLD2, WriteAdr], (instregex "LD4Rv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
+def : InstRW<[CortexA55WriteVLD4, WriteAdr], (instregex "LD4Fourv(8b|4h|2s|1d)_POST$")>;
+def : InstRW<[CortexA55WriteVLD8, WriteAdr], (instregex "LD4Fourv(16b|8h|4s|2d)_POST$")>;
+
+//---
+// Vector Stores
+//---
+def : InstRW<[CortexA55WriteVST1], (instregex "ST1i(8|16|32|64)$")>;
+def : InstRW<[CortexA55WriteVST1], (instregex "ST1Onev(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
+def : InstRW<[CortexA55WriteVST1], (instregex "ST1Twov(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
+def : InstRW<[CortexA55WriteVST2], (instregex "ST1Threev(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
+def : InstRW<[CortexA55WriteVST4], (instregex "ST1Fourv(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
+def : InstRW<[CortexA55WriteVST1, WriteAdr], (instregex "ST1i(8|16|32|64)_POST$")>;
+def : InstRW<[CortexA55WriteVST1, WriteAdr], (instregex "ST1Onev(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
+def : InstRW<[CortexA55WriteVST1, WriteAdr], (instregex "ST1Twov(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
+def : InstRW<[CortexA55WriteVST2, WriteAdr], (instregex "ST1Threev(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
+def : InstRW<[CortexA55WriteVST4, WriteAdr], (instregex "ST1Fourv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
+
+def : InstRW<[CortexA55WriteVST2], (instregex "ST2i(8|16|32|64)$")>;
+def : InstRW<[CortexA55WriteVST2], (instregex "ST2Twov(8b|4h|2s)$")>;
+def : InstRW<[CortexA55WriteVST4], (instregex "ST2Twov(16b|8h|4s|2d)$")>;
+def : InstRW<[CortexA55WriteVST2, WriteAdr], (instregex "ST2i(8|16|32|64)_POST$")>;
+def : InstRW<[CortexA55WriteVST2, WriteAdr], (instregex "ST2Twov(8b|4h|2s)_POST$")>;
+def : InstRW<[CortexA55WriteVST4, WriteAdr], (instregex "ST2Twov(16b|8h|4s|2d)_POST$")>;
+
+def : InstRW<[CortexA55WriteVST2], (instregex "ST3i(8|16|32|64)$")>;
+def : InstRW<[CortexA55WriteVST4], (instregex "ST3Threev(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
+def : InstRW<[CortexA55WriteVST2, WriteAdr], (instregex "ST3i(8|16|32|64)_POST$")>;
+def : InstRW<[CortexA55WriteVST4, WriteAdr], (instregex "ST3Threev(8b|4h|2s|1d|2d|16b|8h|4s|4d)_POST$")>;
+
+def : InstRW<[CortexA55WriteVST2], (instregex "ST4i(8|16|32|64)$")>;
+def : InstRW<[CortexA55WriteVST4], (instregex "ST4Fourv(8b|4h|2s|1d|16b|8h|4s|2d)$")>;
+def : InstRW<[CortexA55WriteVST2, WriteAdr], (instregex "ST4i(8|16|32|64)_POST$")>;
+def : InstRW<[CortexA55WriteVST4, WriteAdr], (instregex "ST4Fourv(8b|4h|2s|1d|16b|8h|4s|2d)_POST$")>;
+
+//---
+// Floating Point Conversions, MAC, DIV, SQRT
+//---
+def : InstRW<[CortexA55WriteFPALU_F3], (instregex "^FCVT[ALMNPZ][SU](S|U)?(W|X)")>;
+def : InstRW<[CortexA55WriteFPALU_F4], (instregex "^FCVT(X)?[ALMNPXZ](S|U|N)?v")>;
+
+def : InstRW<[CortexA55WriteFPALU_F4], (instregex "^(S|U)CVTF(S|U)(W|X)(H|S|D)")>;
+def : InstRW<[CortexA55WriteFPALU_F4], (instregex "^(S|U)CVTF(h|s|d)")>;
+def : InstRW<[CortexA55WriteFPALU_F4], (instregex "^(S|U)CVTFv")>;
+
+def : InstRW<[CortexA55WriteFMAC], (instregex "^FN?M(ADD|SUB).*")>;
+def : InstRW<[CortexA55WriteFMAC], (instregex "^FML(A|S).*")>;
+def : InstRW<[CortexA55WriteFDivSP], (instrs FDIVSrr)>;
+def : InstRW<[CortexA55WriteFDivDP], (instrs FDIVDrr)>;
+def : InstRW<[CortexA55WriteFDivSP], (instregex "^FDIVv.*32$")>;
+def : InstRW<[CortexA55WriteFDivDP], (instregex "^FDIVv.*64$")>;
+def : InstRW<[CortexA55WriteFSqrtSP], (instregex "^.*SQRT.*32$")>;
+def : InstRW<[CortexA55WriteFSqrtDP], (instregex "^.*SQRT.*64$")>;
+}
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