# Copyright (c) 2012 The Regents of The University of Michigan
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from m5.objects import *

# Simple ALU Instructions have a latency of 1
class O3_ARM_v7a_Simple_Int(FUDesc):
    opList = [OpDesc(opClass="IntAlu", opLat=1)]
    count = 2


# Complex ALU instructions have a variable latencies
class O3_ARM_v7a_Complex_Int(FUDesc):
    opList = [
        OpDesc(opClass="IntMult", opLat=3, pipelined=True),
        OpDesc(opClass="IntDiv", opLat=12, pipelined=False),
        OpDesc(opClass="IprAccess", opLat=3, pipelined=True),
    ]
    count = 1


# Floating point and SIMD instructions
class O3_ARM_v7a_FP(FUDesc):
    opList = [
        OpDesc(opClass="SimdAdd", opLat=4),
        OpDesc(opClass="SimdAddAcc", opLat=4),
        OpDesc(opClass="SimdAlu", opLat=4),
        OpDesc(opClass="SimdCmp", opLat=4),
        OpDesc(opClass="SimdCvt", opLat=3),
        OpDesc(opClass="SimdMisc", opLat=3),
        OpDesc(opClass="SimdMult", opLat=5),
        OpDesc(opClass="SimdMultAcc", opLat=5),
        OpDesc(opClass="SimdShift", opLat=3),
        OpDesc(opClass="SimdShiftAcc", opLat=3),
        OpDesc(opClass="SimdSqrt", opLat=9),
        OpDesc(opClass="SimdFloatAdd", opLat=5),
        OpDesc(opClass="SimdFloatAlu", opLat=5),
        OpDesc(opClass="SimdFloatCmp", opLat=3),
        OpDesc(opClass="SimdFloatCvt", opLat=3),
        OpDesc(opClass="SimdFloatDiv", opLat=3),
        OpDesc(opClass="SimdFloatMisc", opLat=3),
        OpDesc(opClass="SimdFloatMult", opLat=3),
        OpDesc(opClass="SimdFloatMultAcc", opLat=5),
        OpDesc(opClass="SimdFloatSqrt", opLat=9),
        OpDesc(opClass="FloatAdd", opLat=5),
        OpDesc(opClass="FloatCmp", opLat=5),
        OpDesc(opClass="FloatCvt", opLat=5),
        OpDesc(opClass="FloatDiv", opLat=9, pipelined=False),
        OpDesc(opClass="FloatSqrt", opLat=33, pipelined=False),
        OpDesc(opClass="FloatMult", opLat=4),
        OpDesc(opClass="FloatMultAcc", opLat=5),
        OpDesc(opClass="FloatMisc", opLat=3),
    ]
    count = 2


# Load/Store Units
class O3_ARM_v7a_Load(FUDesc):
    opList = [
        OpDesc(opClass="MemRead", opLat=2),
        OpDesc(opClass="FloatMemRead", opLat=2),
    ]
    count = 1


class O3_ARM_v7a_Store(FUDesc):
    opList = [
        OpDesc(opClass="MemWrite", opLat=2),
        OpDesc(opClass="FloatMemWrite", opLat=2),
    ]
    count = 1


# Functional Units for this CPU
class O3_ARM_v7a_FUP(FUPool):
    FUList = [
        O3_ARM_v7a_Simple_Int(),
        O3_ARM_v7a_Complex_Int(),
        O3_ARM_v7a_Load(),
        O3_ARM_v7a_Store(),
        O3_ARM_v7a_FP(),
    ]


# Bi-Mode Branch Predictor
class O3_ARM_v7a_BP(BiModeBP):
    globalPredictorSize = 8192
    globalCtrBits = 2
    choicePredictorSize = 8192
    choiceCtrBits = 2
    BTBEntries = 2048
    BTBTagSize = 18
    RASSize = 16
    instShiftAmt = 2


class O3_ARM_v7a_3(ArmO3CPU):
    LQEntries = 16
    SQEntries = 16
    LSQDepCheckShift = 0
    LFSTSize = 1024
    SSITSize = 1024
    decodeToFetchDelay = 1
    renameToFetchDelay = 1
    iewToFetchDelay = 1
    commitToFetchDelay = 1
    renameToDecodeDelay = 1
    iewToDecodeDelay = 1
    commitToDecodeDelay = 1
    iewToRenameDelay = 1
    commitToRenameDelay = 1
    commitToIEWDelay = 1
    fetchWidth = 3
    fetchBufferSize = 16
    fetchToDecodeDelay = 3
    decodeWidth = 3
    decodeToRenameDelay = 2
    renameWidth = 3
    renameToIEWDelay = 1
    issueToExecuteDelay = 1
    dispatchWidth = 6
    issueWidth = 8
    wbWidth = 8
    fuPool = O3_ARM_v7a_FUP()
    iewToCommitDelay = 1
    renameToROBDelay = 1
    commitWidth = 8
    squashWidth = 8
    trapLatency = 13
    backComSize = 5
    forwardComSize = 5
    numPhysIntRegs = 128
    numPhysFloatRegs = 192
    numPhysVecRegs = 48
    numIQEntries = 32
    numROBEntries = 40

    switched_out = False
    branchPred = O3_ARM_v7a_BP()


# Instruction Cache
class O3_ARM_v7a_ICache(Cache):
    tag_latency = 1
    data_latency = 1
    response_latency = 1
    mshrs = 2
    tgts_per_mshr = 8
    size = "32kB"
    assoc = 2
    is_read_only = True
    # Writeback clean lines as well
    writeback_clean = True


# Data Cache
class O3_ARM_v7a_DCache(Cache):
    tag_latency = 2
    data_latency = 2
    response_latency = 2
    mshrs = 6
    tgts_per_mshr = 8
    size = "32kB"
    assoc = 2
    write_buffers = 16
    # Consider the L2 a victim cache also for clean lines
    writeback_clean = True


# L2 Cache
class O3_ARM_v7aL2(Cache):
    tag_latency = 12
    data_latency = 12
    response_latency = 12
    mshrs = 16
    tgts_per_mshr = 8
    size = "1MB"
    assoc = 16
    write_buffers = 8
    prefetch_on_access = True
    clusivity = "mostly_excl"
    # Simple stride prefetcher
    prefetcher = StridePrefetcher(degree=8, latency=1)
    tags = BaseSetAssoc()
    replacement_policy = RandomRP()