//===-- PPCScheduleP9.td - PPC P9 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 itinerary class data for the POWER9 processor.
//
//===----------------------------------------------------------------------===//
def P9Model : SchedMachineModel {
// The maximum number of instructions to be issued at the same time.
// While a value of 8 is technically correct since 8 instructions can be
// fetched from the instruction cache. However, only 6 instructions may be
// actually dispatched at a time.
let IssueWidth = 8;
// Load latency is 4 or 5 cycles depending on the load. This latency assumes
// that we have a cache hit. For a cache miss the load latency will be more.
// There are two instructions (lxvl, lxvll) that have a latency of 6 cycles.
// However it is not worth bumping this value up to 6 when the vast majority
// of instructions are 4 or 5 cycles.
let LoadLatency = 5;
// A total of 16 cycles to recover from a branch mispredict.
let MispredictPenalty = 16;
// Try to make sure we have at least 10 dispatch groups in a loop.
// A dispatch group is 6 instructions.
let LoopMicroOpBufferSize = 60;
// As iops are dispatched to a slice, they are held in an independent slice
// issue queue until all register sources and other dependencies have been
// resolved and they can be issued. Each of four execution slices has an
// 11-entry iop issue queue.
let MicroOpBufferSize = 44;
let CompleteModel = 1;
// Do not support SPE (Signal Processing Engine) or prefixed instructions on
// Power 9, or MMA, or paired vector mem ops, or PC relative mem ops, or
// instructions introduced after ISA 3.0.
let UnsupportedFeatures = [HasSPE, PrefixInstrs, MMA,
PairedVectorMemops, IsBookE,
PCRelativeMemops, IsISA3_1, IsISAFuture];
}
let SchedModel = P9Model in {
// ***************** Processor Resources *****************
// Dispatcher slots:
// x0, x1, x2, and x3 are the dedicated slice dispatch ports, where each
// corresponds to one of the four execution slices.
def DISPx02 : ProcResource<2>;
def DISPx13 : ProcResource<2>;
// The xa and xb ports can be used to send an iop to either of the two slices
// of the superslice, but are restricted to iops with only two primary sources.
def DISPxab : ProcResource<2>;
// b0 and b1 are dedicated dispatch ports into the branch slice.
def DISPb01 : ProcResource<2>;
// Any non BR dispatch ports
def DISP_NBR
: ProcResGroup<[ DISPx02, DISPx13, DISPxab]>;
def DISP_SS : ProcResGroup<[ DISPx02, DISPx13]>;
// Issue Ports
// An instruction can go down one of two issue queues.
// Address Generation (AGEN) mainly for loads and stores.
// Execution (EXEC) for most other instructions.
// Some instructions cannot be run on just any issue queue and may require an
// Even or an Odd queue. The EXECE represents the even queues and the EXECO
// represents the odd queues.
def IP_AGEN : ProcResource<4>;
def IP_EXEC : ProcResource<4>;
def IP_EXECE : ProcResource<2> {
//Even Exec Ports
let Super = IP_EXEC;
}
def IP_EXECO : ProcResource<2> {
//Odd Exec Ports
let Super = IP_EXEC;
}
// Pipeline Groups
// Four ALU (Fixed Point Arithmetic) units in total. Two even, two Odd.
def ALU : ProcResource<4>;
def ALUE : ProcResource<2> {
//Even ALU pipelines
let Super = ALU;
}
def ALUO : ProcResource<2> {
//Odd ALU pipelines
let Super = ALU;
}
// Two DIV (Fixed Point Divide) units.
def DIV : ProcResource<2>;
// Four DP (Floating Point) units in total. Two even, two Odd.
def DP : ProcResource<4>;
def DPE : ProcResource<2> {
//Even DP pipelines
let Super = DP;
}
def DPO : ProcResource<2> {
//Odd DP pipelines
let Super = DP;
}
// Four LS (Load or Store) units.
def LS : ProcResource<4>;
// Two PM (Permute) units.
def PM : ProcResource<2>;
// Only one DFU (Decimal Floating Point and Quad Precision) unit.
def DFU : ProcResource<1>;
// Only one Branch unit.
def BR : ProcResource<1> {
let BufferSize = 16;
}
// Only one CY (Crypto) unit.
def CY : ProcResource<1>;
// ***************** SchedWriteRes Definitions *****************
// Dispatcher
// Dispatch Rules: '-' or 'V'
// Vector ('V') - vector iops (128-bit operand) take only one decode and
// dispatch slot but are dispatched to both the even and odd slices of a
// superslice.
def DISP_1C : SchedWriteRes<[DISP_NBR]> {
let NumMicroOps = 0;
let Latency = 1;
}
// Dispatch Rules: 'E'
// Even slice ('E')- certain operations must be sent only to an even slice.
// Also consumes odd dispatch slice slot of the same superslice at dispatch
def DISP_EVEN_1C : SchedWriteRes<[ DISPx02, DISPx13 ]> {
let NumMicroOps = 0;
let Latency = 1;
}
// Dispatch Rules: 'P'
// Paired ('P') - certain cracked and expanded iops are paired such that they
// must dispatch together to the same superslice.
def DISP_PAIR_1C : SchedWriteRes<[ DISP_SS, DISP_SS]> {
let NumMicroOps = 0;
let Latency = 1;
}
// Tuple Restricted ('R') - certain iops preclude dispatching more than one
// operation per slice for the super- slice to which they are dispatched
def DISP_3SLOTS_1C : SchedWriteRes<[DISPx02, DISPx13, DISPxab]> {
let NumMicroOps = 0;
let Latency = 1;
}
// Each execution and branch slice can receive up to two iops per cycle
def DISP_BR_1C : SchedWriteRes<[ DISPxab ]> {
let NumMicroOps = 0;
let Latency = 1;
}
// Issue Ports
def IP_AGEN_1C : SchedWriteRes<[IP_AGEN]> {
let NumMicroOps = 0;
let Latency = 1;
}
def IP_EXEC_1C : SchedWriteRes<[IP_EXEC]> {
let NumMicroOps = 0;
let Latency = 1;
}
def IP_EXECE_1C : SchedWriteRes<[IP_EXECE]> {
let NumMicroOps = 0;
let Latency = 1;
}
def IP_EXECO_1C : SchedWriteRes<[IP_EXECO]> {
let NumMicroOps = 0;
let Latency = 1;
}
//Pipeline Groups
// ALU Units
// An ALU may take either 2 or 3 cycles to complete the operation.
// However, the ALU unit is only ever busy for 1 cycle at a time and may
// receive new instructions each cycle.
def P9_ALU_2C : SchedWriteRes<[ALU]> {
let Latency = 2;
}
def P9_ALUE_2C : SchedWriteRes<[ALUE]> {
let Latency = 2;
}
def P9_ALUO_2C : SchedWriteRes<[ALUO]> {
let Latency = 2;
}
def P9_ALU_3C : SchedWriteRes<[ALU]> {
let Latency = 3;
}
def P9_ALUE_3C : SchedWriteRes<[ALUE]> {
let Latency = 3;
}
def P9_ALUO_3C : SchedWriteRes<[ALUO]> {
let Latency = 3;
}
// DIV Unit
// A DIV unit may take from 5 to 40 cycles to complete.
// Some DIV operations may keep the unit busy for up to 8 cycles.
def P9_DIV_5C : SchedWriteRes<[DIV]> {
let Latency = 5;
}
def P9_DIV_12C : SchedWriteRes<[DIV]> {
let Latency = 12;
}
def P9_DIV_16C_8 : SchedWriteRes<[DIV]> {
let ReleaseAtCycles = [8];
let Latency = 16;
}
def P9_DIV_24C_8 : SchedWriteRes<[DIV]> {
let ReleaseAtCycles = [8];
let Latency = 24;
}
def P9_DIV_40C_8 : SchedWriteRes<[DIV]> {
let ReleaseAtCycles = [8];
let Latency = 40;
}
// DP Unit
// A DP unit may take from 2 to 36 cycles to complete.
// Some DP operations keep the unit busy for up to 10 cycles.
def P9_DP_5C : SchedWriteRes<[DP]> {
let Latency = 5;
}
def P9_DP_7C : SchedWriteRes<[DP]> {
let Latency = 7;
}
def P9_DPE_7C : SchedWriteRes<[DPE]> {
let Latency = 7;
}
def P9_DPO_7C : SchedWriteRes<[DPO]> {
let Latency = 7;
}
def P9_DP_22C_5 : SchedWriteRes<[DP]> {
let ReleaseAtCycles = [5];
let Latency = 22;
}
def P9_DPO_24C_8 : SchedWriteRes<[DPO]> {
let ReleaseAtCycles = [8];
let Latency = 24;
}
def P9_DPE_24C_8 : SchedWriteRes<[DPE]> {
let ReleaseAtCycles = [8];
let Latency = 24;
}
def P9_DP_26C_5 : SchedWriteRes<[DP]> {
let ReleaseAtCycles = [5];
let Latency = 22;
}
def P9_DPE_27C_10 : SchedWriteRes<[DP]> {
let ReleaseAtCycles = [10];
let Latency = 27;
}
def P9_DPO_27C_10 : SchedWriteRes<[DP]> {
let ReleaseAtCycles = [10];
let Latency = 27;
}
def P9_DP_33C_8 : SchedWriteRes<[DP]> {
let ReleaseAtCycles = [8];
let Latency = 33;
}
def P9_DPE_33C_8 : SchedWriteRes<[DPE]> {
let ReleaseAtCycles = [8];
let Latency = 33;
}
def P9_DPO_33C_8 : SchedWriteRes<[DPO]> {
let ReleaseAtCycles = [8];
let Latency = 33;
}
def P9_DP_36C_10 : SchedWriteRes<[DP]> {
let ReleaseAtCycles = [10];
let Latency = 36;
}
def P9_DPE_36C_10 : SchedWriteRes<[DP]> {
let ReleaseAtCycles = [10];
let Latency = 36;
}
def P9_DPO_36C_10 : SchedWriteRes<[DP]> {
let ReleaseAtCycles = [10];
let Latency = 36;
}
// PM Unit
// Three cycle permute operations.
def P9_PM_3C : SchedWriteRes<[PM]> {
let Latency = 3;
}
// Load and Store Units
// Loads can have 4, 5 or 6 cycles of latency.
// Stores are listed as having a single cycle of latency. This is not
// completely accurate since it takes more than 1 cycle to actually store
// the value. However, since the store does not produce a result it can be
// considered complete after one cycle.
def P9_LS_1C : SchedWriteRes<[LS]> {
let Latency = 1;
}
def P9_LS_4C : SchedWriteRes<[LS]> {
let Latency = 4;
}
def P9_LS_5C : SchedWriteRes<[LS]> {
let Latency = 5;
}
def P9_LS_6C : SchedWriteRes<[LS]> {
let Latency = 6;
}
// DFU Unit
// Some of the most expensive ops use the DFU.
// Can take from 12 cycles to 76 cycles to obtain a result.
// The unit may be busy for up to 62 cycles.
def P9_DFU_12C : SchedWriteRes<[DFU]> {
let Latency = 12;
}
def P9_DFU_23C : SchedWriteRes<[DFU]> {
let Latency = 23;
let ReleaseAtCycles = [11];
}
def P9_DFU_24C : SchedWriteRes<[DFU]> {
let Latency = 24;
let ReleaseAtCycles = [12];
}
def P9_DFU_37C : SchedWriteRes<[DFU]> {
let Latency = 37;
let ReleaseAtCycles = [25];
}
def P9_DFU_58C : SchedWriteRes<[DFU]> {
let Latency = 58;
let ReleaseAtCycles = [44];
}
def P9_DFU_76C : SchedWriteRes<[DFU]> {
let Latency = 76;
let ReleaseAtCycles = [62];
}
// 2 or 5 cycle latencies for the branch unit.
def P9_BR_2C : SchedWriteRes<[BR]> {
let Latency = 2;
}
def P9_BR_5C : SchedWriteRes<[BR]> {
let Latency = 5;
}
// 6 cycle latency for the crypto unit
def P9_CY_6C : SchedWriteRes<[CY]> {
let Latency = 6;
}
// ***************** WriteSeq Definitions *****************
// These are combinations of the resources listed above.
// The idea is that some cracked instructions cannot be done in parallel and
// so the latencies for their resources must be added.
def P9_LoadAndALUOp_6C : WriteSequence<[P9_LS_4C, P9_ALU_2C]>;
def P9_LoadAndALUOp_7C : WriteSequence<[P9_LS_5C, P9_ALU_2C]>;
def P9_LoadAndALU2Op_7C : WriteSequence<[P9_LS_4C, P9_ALU_3C]>;
def P9_LoadAndALU2Op_8C : WriteSequence<[P9_LS_5C, P9_ALU_3C]>;
def P9_LoadAndPMOp_8C : WriteSequence<[P9_LS_5C, P9_PM_3C]>;
def P9_IntDivAndALUOp_18C_8 : WriteSequence<[P9_DIV_16C_8, P9_ALU_2C]>;
def P9_IntDivAndALUOp_26C_8 : WriteSequence<[P9_DIV_24C_8, P9_ALU_2C]>;
def P9_IntDivAndALUOp_42C_8 : WriteSequence<[P9_DIV_40C_8, P9_ALU_2C]>;
def P9_StoreAndALUOp_3C : WriteSequence<[P9_LS_1C, P9_ALU_2C]>;
def P9_ALUOpAndALUOp_4C : WriteSequence<[P9_ALU_2C, P9_ALU_2C]>;
def P9_ALU2OpAndALU2Op_6C : WriteSequence<[P9_ALU_3C, P9_ALU_3C]>;
def P9_ALUOpAndALUOpAndALUOp_6C :
WriteSequence<[P9_ALU_2C, P9_ALU_2C, P9_ALU_2C]>;
def P9_DPOpAndALUOp_7C : WriteSequence<[P9_DP_5C, P9_ALU_2C]>;
def P9_DPOpAndALU2Op_10C : WriteSequence<[P9_DP_7C, P9_ALU_3C]>;
def P9_DPOpAndALU2Op_25C_5 : WriteSequence<[P9_DP_22C_5, P9_ALU_3C]>;
def P9_DPOpAndALU2Op_29C_5 : WriteSequence<[P9_DP_26C_5, P9_ALU_3C]>;
def P9_DPOpAndALU2Op_36C_8 : WriteSequence<[P9_DP_33C_8, P9_ALU_3C]>;
def P9_DPOpAndALU2Op_39C_10 : WriteSequence<[P9_DP_36C_10, P9_ALU_3C]>;
def P9_BROpAndALUOp_7C : WriteSequence<[P9_BR_5C, P9_ALU_2C]>;
// Include the resource requirements of individual instructions.
include "P9InstrResources.td"
}
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