package vexiiriscv

import spinal.core._
import spinal.lib._
import spinal.lib.bus.misc.SizeMapping
import spinal.lib.bus.tilelink.{M2sTransfers, SizeRange}
import spinal.lib.cpu.riscv.debug.DebugTransportModuleParameter
import spinal.lib.misc.plugin.Hostable
import spinal.lib.system.tag.{PmaRegion, PmaRegionImpl}
import spinal.lib.tools.binarySystem.BytesToLiteral
import vexiiriscv._
import vexiiriscv.decode.DecoderPlugin
import vexiiriscv.execute._
import vexiiriscv.execute.cfu.{CfuBusParameter, CfuPlugin, CfuPluginEncoding}
import vexiiriscv.execute.fpu.{FpuAddSharedParam, FpuMulParam}
import vexiiriscv.execute.lsu._
import vexiiriscv.fetch.{FetchCachelessAxi4Plugin, FetchCachelessPlugin, FetchCachelessWishbonePlugin, FetchL1Axi4Plugin, FetchL1Plugin, FetchL1WishbonePlugin, PrefetcherNextLinePlugin}
import vexiiriscv.memory.{MmuPortParameter, MmuSpec, MmuStorageLevel, MmuStorageParameter, PmpParam, PmpPlugin, PmpPortParameter, ShadowMmuPlugin, TranslatedDBusAccessPlugin}
import vexiiriscv.misc._
import vexiiriscv.prediction.{LearnCmd, LearnPlugin}
import vexiiriscv.riscv.{FloatRegFile, IntRegFile}
import vexiiriscv.schedule.DispatchPlugin
import vexiiriscv.test.WhiteboxerPlugin

import java.security.MessageDigest
import scala.collection.mutable.ArrayBuffer
import scala.util.Random
import vexiiriscv.fetch.FetchCachelessTimingParameter
import vexiiriscv.fetch.FetchL1TimingParameter


object FetchBusEnum extends Enumeration {
  type Bus = Value
  val native, axi4, wishbone = Value
}
object LsuBusEnum extends Enumeration {
  type Bus = Value
  val native, axi4, wishbone = Value
}
object LsuL1BusEnum extends Enumeration {
  type Bus = Value
  val native, axi4, wishbone = Value
}

object ParamSimple{
  def addOptionRegion(parser: scopt.OptionParser[Unit], regions : ArrayBuffer[PmaRegion]): Unit = {
    import parser._
    opt[Map[String, String]]("region").unbounded() action { (v, c) =>
      regions += PmaRegionImpl(
        mapping = SizeMapping(BigInt(v("base"), 16), BigInt(v("size"), 16)),
        transfers = M2sTransfers.all,
        isMain = v("main") == "1",
        isExecutable = v("exe") == "1"
      )
    } text ("Specify a memory region, for instance : --region base=80000000,size=80000000,main=1,exe=1 --region base=10000000,size=10000000,main=0,exe=0")
  }

  val defaultPma = List[PmaRegion](
    new PmaRegionImpl(
      mapping = SizeMapping(0x80000000l, 0x80000000l),
      isMain = true,
      isExecutable = true,
      transfers = M2sTransfers(
        get = SizeRange.all,
        putFull = SizeRange.all
      )
    ),
    new PmaRegionImpl(
      mapping = SizeMapping(0x10000000l, 0x10000000l),
      isMain = false,
      isExecutable = true,
      transfers = M2sTransfers(
        get = SizeRange.all,
        putFull = SizeRange.all
      )
    )
  )

  def setPma(plugins : scala.collection.Seq[Hostable], regions : scala.collection.Seq[PmaRegion] = defaultPma) = {
    val array = ArrayBuffer(regions.toSeq :_*)
    plugins.foreach {
      case p: FetchCachelessPlugin => p.regions.load(array)
      case p: LsuCachelessPlugin => p.regions.load(array)
      case p: FetchL1Plugin => p.regions.load(array)
      case p: LsuPlugin => p.ioRegions.load(array)
      case p: LsuL1Plugin => p.regions.load(array)
      case _ =>
    }
    plugins
  }
}


/**
 * ParamSimple is a data class which can be used to generate a collection of properly configured plugins for VexiiRiscv.
 * - you create an instance of ParamSimple
 * - you configure it
 * - you ask it to provide the list of VexiiRiscv plugins
 * - you instanciate VexiiRiscv with that list of plugin
 * - Thenthen you should get a functional VexiiRiscv.
 */
class ParamSimple() {
  var xlen = 32
  var extension = ExtensionManager(Set("zicsr", "zifencei"))
  var withAlignerBuffer = false
  var withDispatcherBuffer = false
  var hartCount = 1
  var disableMmu = false
  var asidWidth = 0
  var physicalWidth = 32
  var resetVector = 0x80000000l
  var decoders = 1
  var lanes = 1
  var decoderAt = 1
  var dispatcherAt = 1
  var regFileSync = true
  var regFileDualPortRam = true
  var regFileRegBasedRam = false
  var withGShare = false
  var withBtb = false
  var withRas = false
  var withLateAlu = false
  var storeRs2Late = false
  var withRvcbmLlc = false
  var withTesterPlugin = false
  var gshareBanks = 1
  var btbDualPortRam = true
  var fpuIgnoreSubnormal = false
  var fpuWbAt = 2
  var fpuMulParam = FpuMulParam()
  var fpuAddSharedParam = FpuAddSharedParam()
  var withWhiteboxerOutputs = false
  var privParam = PrivilegedParam.base
  var lsuForkAt = 0
  var lsuPmaAt = 0
  var withHartIdInput = false
  var relaxedBranch = false
  var relaxedShift = false
  var relaxedSrc = true
  var relaxedBtb = false
  var relaxedBtbHit = false
  var relaxedDiv = false
  var relaxedMulInputs = false
  var allowBypassFrom = 100 //100 => disabled
  var additionalPerformanceCounters = 0
  var fetchL1Enable = false
  var fetchL1Sets = 64
  var fetchL1Ways = 1
  var fetchL1ReducedBank = false
  var fetchMemDataWidthMin = 32
  var fetchL1RefillCount = 1
  var fetchL1Prefetch = "none"
  var fetchL1TagsReadAsync = false
  var fetchBus = FetchBusEnum.native
  var lsuBus = LsuBusEnum.native
  var lsuL1Bus = LsuL1BusEnum.native
  var lsuSoftwarePrefetch = false
  var lsuHardwarePrefetch = "none"
  var lsuStoreBufferSlots = 0
  var lsuStoreBufferOps = 0
  var lsuL1Enable = false
  var lsuL1Sets = 64
  var lsuL1Ways = 1
  var lsuL1RefillCount = 1
  var lsuL1WritebackCount = 1
  var lsuL1Coherency = false
  var lsuL1TagsReadAsync = false
  var lsuMemDataWidthMin = 32
  var withLsuBypass = false
  var withIterativeShift = false
  var divRadix = 2
  var divImpl = ""
  var divArea = true
  var fetchForkAt = 0
  var btbSets = 512
  var btbHashWidth = 16
  var embeddedJtagTap = false
  var embeddedJtagInstruction = false
  var embeddedJtagCd: ClockDomain = null
  var embeddedJtagNoTapCd: ClockDomain = null
  var bootMemClear = false
  var mulKeepSrc = false
  var withCfu = false
  var gshareBytes = 4 KiB
  var recordHtinst = false
  val prefetcherRptParam = new PrefetcherRptParam()

  var fetchTsp = MmuStorageParameter(
    levels = List(
      MmuStorageLevel(
        id = 0,
        ways = 2,
        sets = 32
      ),
      MmuStorageLevel(
        id = 1,
        ways = 1,
        sets = 32
      )
    ),
    priority = 0
  )

  var pmpParam = new PmpParam(
    pmpSize = 0,
    granularity = 4096,
    withTor = true,
    withNapot = true
  )

  var fetchNoL1PmpParam = new PmpPortParameter(
    napotMatchAt = 0,
    napotHitsAt = 1,
    torCmpAt = 0,
    torHitsAt = 1,
    hitsAt = 1,
    rspAt = 1
  )

  var lsuNoL1PmpParam = new PmpPortParameter(
    napotMatchAt = 0,
    napotHitsAt = 0,
    torCmpAt = 0,
    torHitsAt = 0,
    hitsAt = 0,
    rspAt = 0
  )

  var fetchL1PmpParam = new PmpPortParameter(
    napotMatchAt = 1,
    napotHitsAt = 1,
    torCmpAt = 1,
    torHitsAt = 2,
    hitsAt = 2,
    rspAt = 2
  )

  var lsuL1PmpParam = new PmpPortParameter(
    napotMatchAt = 1,
    napotHitsAt = 1,
    torCmpAt = 1,
    torHitsAt = 2,
    hitsAt = 2,
    rspAt = 2
  )

  var lsuTsp = MmuStorageParameter(
    levels = List(
      MmuStorageLevel(
        id = 0,
        ways = 3,
        sets = 32
      ),
      MmuStorageLevel(
        id = 1,
        ways = 1,
        sets = 32
      )
    ),
    priority = 1
  )

  var fetchTpp = MmuPortParameter(
    readAt = 1,
    hitsAt = 1,
    ctrlAt = 1,
    rspAt = 1
  )

  var lsuTpp = MmuPortParameter(
    readAt = 0,
    hitsAt = 0,
    ctrlAt = 1,
    rspAt = 1
  )

  def fetchCachelessTiming = FetchCachelessTimingParameter(
    addressAt = 0,
    pmaAt     = 0,
    forkAt    = fetchForkAt,
    joinAt    = fetchForkAt+1 //You can for instance allow the external memory to have more latency by changing this
  )
  def fetchCachelessHypervisorTiming = FetchCachelessTimingParameter(
    addressAt = 0,
    pmaAt     = 1,
    forkAt    = fetchForkAt+1,
    joinAt    = fetchForkAt+2 //You can for instance allow the external memory to have more latency by changing this
  )

  def fetchL1Timing = FetchL1TimingParameter(
    readAt      = 0,
    hitsAt      = 1,
    hitAt       = 1,
    bankMuxesAt = 1,
    bankMuxAt   = 2,
    ctrlAt      = 2
  )
  def fetchL1HypervisorTiming = FetchL1TimingParameter(
    readAt      = 0,
    hitsAt      = 2,
    hitAt       = 2,
    bankMuxesAt = 2,
    bankMuxAt   = 3,
    ctrlAt      = 3
  )

  def lsuCachelessTiming = LsuCachelessTimingParameter(
    addressAt = 0,
    triggerAt = 0,
    pmaAt     = lsuPmaAt,
    forkAt    = lsuForkAt+0,
    joinAt    = lsuForkAt+1,
    wbAt      = 2 //TODO
  )
  def lsuCachelessHypervisorTiming = LsuCachelessTimingParameter(
    addressAt = 0,
    triggerAt = 1,
    pmaAt     = lsuPmaAt+1,
    forkAt    = lsuForkAt+1,
    joinAt    = lsuForkAt+2,
    wbAt      = 3 //TODO
  )

  def lsuTiming = LsuTimingParameter(
    addressAt = 0,
    pmaAt = 1,
    triggerAt = 1,
    ctrlAt = 2,
    wbAt = 2,
    addressLength = 1
  )
  def lsuHypervisorTiming = LsuTimingParameter(
    addressAt = 0,
    pmaAt = 2,
    triggerAt = 2,
    ctrlAt = 3,
    wbAt = 3,
    addressLength = 2
  )

  def lsuL1Timing = LsuL1TimingParameter(
    bankReadAt = 0,
    wayReadAt = 0,
    hitsAt = 1,
    hitAt = 2,
    bankMuxesAt = 1,
    bankMuxAt = 2,
    ctrlAt = 2
  )
  def lsuL1HypervisorTiming = LsuL1TimingParameter(
    bankReadAt = 0,
    wayReadAt = 0,
    hitsAt = 2,
    hitAt = 3,
    bankMuxesAt = 2,
    bankMuxAt = 3,
    ctrlAt = 3
  )

  def alignerPluginFetchAt = fetchL1Enable.mux(2, 1+fetchForkAt) + extension.withRvh.toInt
  def fetchMemDataWidth = 32*decoders max fetchMemDataWidthMin
  def lsuMemDataWidth = xlen max lsuMemDataWidthMin max extension.withRvd.mux(64, 0)
  def memDataWidth = List(fetchMemDataWidth, lsuMemDataWidth).max

  //  Debug modifiers
  val debugParam = sys.env.getOrElse("VEXIIRISCV_DEBUG_PARAM", "0").toInt.toBoolean
  if(debugParam) {
    additionalPerformanceCounters = 4
    regFileSync = false
    allowBypassFrom = 0

    withGShare = true
    withBtb = true
    withRas = true
    //    relaxedBranch = true  // !!
//    relaxedBtb = true     // !!
    fetchL1Enable = true
    fetchL1Sets = 64
    fetchL1Ways = 4
    fetchL1ReducedBank = true
    fetchMemDataWidthMin = 64
    fetchL1RefillCount = 3
    fetchL1Prefetch = "nl"
    lsuL1Enable = true
    lsuMemDataWidthMin = 64
    lsuL1Sets = 64
    lsuL1Ways = 4
    lsuL1RefillCount = 8
    lsuL1WritebackCount = 8
    lsuL1Coherency = true
//    lsuStoreBufferSlots = 2
//    lsuStoreBufferOps = 32
    lsuStoreBufferSlots = 4
    lsuStoreBufferOps = 32
    withLsuBypass = true
//    lsuSoftwarePrefetch = true
    lsuHardwarePrefetch = "rpt"

    //    lsuForkAt = 1
    divArea = false
    divRadix = 2
//    decoders = 2
//    lanes = 2
//    storeRs2Late = true
//    withLateAlu = true
    withDispatcherBuffer = true
    withAlignerBuffer = true
//    fpuIgnoreSubnormal = true
//    fpuFmaFullAccuracy = false

    privParam.withSupervisor = true
    privParam.withUser = true
    xlen = 64
    addISA("m", "a", "f", "d", "c", "s", "u", "zihpm", "zicntr")
//    physicalWidth = 38


    privParam.withDebug = true
    privParam.debugTriggers = 4
    privParam.debugTriggersLsu = true
    embeddedJtagTap = true


//    decoders = 2
//    lanes = 2
//    regFileSync = false
//    withGShare = true
//    withBtb = true
//    withRas = true
////    withMul = false
////    withDiv = false
//    withLateAlu = true
//    allowBypassFrom = 0
//    relaxedBranch = false
//    relaxedShift = false
//    relaxedSrc = true
//    additionalPerformanceCounters = 4
//    privParam.withSupervisor = true
//    privParam.withUser = true
//    withMmu = true
//    withRva = true
//    withRvc = false
//    withAlignerBuffer = withRvc
//    withFetchL1 = false
//    withLsuL1 = false
//    xlen = 32
//    fetchL1Sets = 64
//    fetchL1Ways = 4
//    lsuL1Sets = 64
//    lsuL1Ways = 4
//    withLsuBypass = true
//    divImpl = ""
//    divRadix = 2
//    divArea = true
//    lsuForkAt = 1
  }


  // Define a few utilities to mutate the ParamSimple
  def withRvm(): Unit = {
    addISA("m")
  }
  def withBranchPredicton(): Unit = {
    withBtb = true
    withGShare = true
    withRas = true
  }
  def withCaches(): Unit = {
    fetchL1Enable = true
    fetchL1Sets = 64
    fetchL1Ways = 2

    lsuL1Enable = true
    lsuL1Sets = 64
    lsuL1Ways = 2

    withLsuBypass = true
  }
  def withLinux(): Unit = {
    addISA("s", "u")
    privParam.withSupervisor = true
    privParam.withUser = true;
  }
  def withMmuSyncRead(): Unit = {
    fetchTsp = MmuStorageParameter(
      levels = List(
        MmuStorageLevel(
          id = 0,
          ways = 2,
          sets = 64
        ),
        MmuStorageLevel(
          id = 1,
          ways = 1,
          sets = 64
        )
      ),
      priority = 0
    )

    lsuTsp = MmuStorageParameter(
      levels = List(
        MmuStorageLevel(
          id = 0,
          ways = 2,
          sets = 64
        ),
        MmuStorageLevel(
          id = 1,
          ways = 1,
          sets = 64
        )
      ),
      priority = 1
    )

    fetchTpp = MmuPortParameter(
      readAt = 1,
      hitsAt = 1,
      ctrlAt = 1,
      rspAt = 1
    )

    lsuTpp = MmuPortParameter(
      readAt = 1,
      hitsAt = 1,
      ctrlAt = 1,
      rspAt = 1
    )
  }

  // Hash code used the regression test to generate a unique workspace folder per config
  override def hashCode() = {
    var hash = 0
    val md = new StringBuilder()
    var rand = new Random(0)
    for(f <- this.getClass.getDeclaredFields){
      val o = f.get(this)
      if(o != null) o.asInstanceOf[Any] match {
        case e: Boolean => md ++= s" $e"
        case e: Int => md ++= s" $e"
        case e: Long => md ++= s" $e"
        case e: BigInt => md ++= s" $e"
        case e: String => md ++= s" $e"
        case e: ExtensionManager => md ++= s" ${e.getIsaStr(includeIgnored = true)}"
        case e : Product => md ++= s" $e"
        case e: Set[_] => md ++= s" ${e.map(_.toString).toSeq.sorted.mkString(" ")}"
        case e => {
          if(e.getClass.getName == "scala.Enumeration$Val"){
            md ++= s" ${e.toString}"
          } else {
            println(s"$e")
            ???
          }
        };
      }
    }
    Math.abs(md.toString.hashCode())
  }

  def addISA(exts: String*): Unit = extension.add(exts :_*)
  def removeISA(exts: String*): Unit = extension.remove(exts :_*)
  def checkISA(exts: String*) = extension.check(exts :_*)

  def withRvZknAes = checkISA("zkne") || checkISA("zknd")

  def withMmu = extension.withSupervisor && !disableMmu

  def fixIsaParams() = {
    if(privParam.imsicInterrupts > 0) {
      addISA("smaia")
      if(extension.withSupervisor) addISA("ssaia")
    }
    if(!withMmu) removeISA("svade")
    extension.finialize(xlen)
    println(s"ISA extensions: ${extension.getIsaNameArray().mkString(", ")}")

    if(extension.withSupervisor) privParam.withSupervisor = true
    if(extension.withHypervisor) privParam.withHypervisor = true
    if(extension.withUser) privParam.withUser = true
    if(extension.withSstc) privParam.withSSTC = true
    if(extension.withRdTime) privParam.withRdTime = true
    if(extension.withSsaia) privParam.withSsaia = true
    if(extension.withRvc) withAlignerBuffer = true
  }

  // Generate a human readable name from most of the supported configuration
  def getName() : String = {
    def opt(that : Boolean, v : String) = that.mux(v, "")
    val isa = s"rv${xlen}${extension.getIsaStr()}"
    val r = new ArrayBuffer[String]()
    r += isa
    r += s"d${decoders}At${decoderAt}"
    r += s"l${lanes}"
    r += s"disAt${dispatcherAt}"
    r += regFileSync.mux("rfs","rfa") + regFileDualPortRam.mux("Dp","Mem")
    if (fetchL1Enable) r += s"fl1xW${lsuL1Ways}xS${lsuL1Sets}Dwm$fetchMemDataWidth${fetchL1ReducedBank.mux("Rb", "")}" else r += s"fclF${fetchForkAt}dw${fetchMemDataWidth}"
    if (lsuL1Enable) r += s"lsul1xW${lsuL1Ways}xS${lsuL1Sets}${withLsuBypass.mux("xBp","")}Sb${lsuStoreBufferSlots}w${lsuStoreBufferOps}dw${lsuMemDataWidth}rc${lsuL1RefillCount}wc${lsuL1WritebackCount}${lsuL1Coherency.mux("Co", "")}" else r += s"lsuP${lsuPmaAt}F${lsuForkAt}dw$lsuMemDataWidth"
    if(allowBypassFrom < 100) r += s"bp$allowBypassFrom"
    if (withBtb) r += s"btbS${btbSets}H${btbHashWidth}${if(relaxedBtb)"R" else ""}"
    if (withRas) r += "ras"
    if (withGShare) r += "gshare"
    if (withLateAlu) r += "la"
    if (withAlignerBuffer) r += "ab"
    if (withDispatcherBuffer) r += "db"
    if (relaxedBranch) r += "rbra"
    if (relaxedShift) r += "rsft"
    if (relaxedSrc) r += "rsrc"
    if (extension.withPerformanceCounters) r += s"pc$additionalPerformanceCounters"
    if (withMmu) r += s"asid$asidWidth"
    if (withIterativeShift) r += "isft"
    if (extension.withDiv) r += s"d${divRadix}${divImpl}${if(divArea)"Area" else ""}"
    if (privParam.withImsic) r += s"if${privParam.imsicInterrupts}gf${privParam.guestExternalInterruptFiles}"
    if (privParam.withDebug) r += s"pdbg"
    if (privParam.withExternalInterrupt) r += "nei"
    if (embeddedJtagTap) r += s"jtagt"
    if (embeddedJtagInstruction) r += s"jtagi"
    r.mkString("_")
  }

  // Initialize a scopt command line argument parser to take control of this SimpleParam
  def addOptions(parser: scopt.OptionParser[Unit]) = {
    import parser._
    opt[Int]("xlen") action { (v, c) => xlen = v }
    opt[Int]("decoders") action { (v, c) => decoders = v }
    opt[Int]("lanes") action { (v, c) => lanes = v }
    opt[Int]("decoder-at") action { (v, c) => decoderAt = v }
    opt[Int]("dispatcher-at") action { (v, c) => dispatcherAt = v }
    opt[Long]("reset-vector").unbounded() action { (v, c) => resetVector = v }
    opt[Unit]("relaxed-div") action { (v, c) => relaxedDiv = true }
    opt[Unit]("relaxed-mul-inputs") action { (v, c) => relaxedMulInputs = true }
    opt[Unit]("relaxed-branch") action { (v, c) => relaxedBranch = true }
    opt[Unit]("relaxed-shift") action { (v, c) => relaxedShift = true }
    opt[Unit]("relaxed-src") action { (v, c) => relaxedSrc = true }
    opt[Unit]("relaxed-btb") action { (v, c) => relaxedBtb = true }
    opt[Unit]("relaxed-btb-hit") action { (v, c) => relaxedBtbHit = true }
    opt[Unit]("stressed-btb") action { (v, c) => relaxedBtb = false }
    opt[Unit]("stressed-div") action { (v, c) => relaxedDiv = false }
    opt[Unit]("stressed-branch") action { (v, c) => relaxedBranch = false }
    opt[Unit]("stressed-shift") action { (v, c) => relaxedShift = false }
    opt[Unit]("stressed-src") action { (v, c) => relaxedSrc = false }
    opt[Unit]("stressed-fpu") action { (v, c) =>
      fpuMulParam.expAt = 0
      fpuMulParam.normAt = 2
      fpuMulParam.packAt = 2
      fpuAddSharedParam.preShiftStage = 0
      fpuAddSharedParam.shifterStage = 0
      fpuAddSharedParam.mathStage = 1
      fpuAddSharedParam.normStage = 2
      fpuAddSharedParam.packAt = 2
      fpuWbAt = 1
    }
    opt[Seq[String]]("with-isa").unbounded() action { (v, c) => addISA(v: _*) }
    opt[Seq[String]]("without-isa").unbounded() action { (v, c) => removeISA(v: _*) }
    opt[Unit]("with-rvm") action { (v, c) => addISA("m") }
    opt[Unit]("with-rve") action { (v, c) => addISA("e") }
    opt[Unit]("with-rva") action { (v, c) => addISA("a") }
    opt[Unit]("with-rvf") action { (v, c) => addISA("f") }
    opt[Unit]("with-rvd") action { (v, c) => addISA("f", "d") }
    opt[Unit]("with-rvc") action { (v, c) => addISA("c") }
    opt[Unit]("with-rvZb") action { (v, c) => addISA("zba", "zbb", "zbc", "zbs") }
    opt[Unit]("with-rvZba") action { (v, c) => addISA("zba") }
    opt[Unit]("with-rvZbb") action { (v, c) => addISA("zbb") }
    opt[Unit]("with-rvZbc") action { (v, c) => addISA("zbc") }
    opt[Unit]("with-rvZbs") action { (v, c) => addISA("zbs") }
    opt[Unit]("with-rvZcbm") action { (v, c) => addISA("zicbom"); }
    opt[Unit]("with-rvZcbm-llc") action { (v, c) => addISA("zicbom"); withRvcbmLlc = true }
    opt[Unit]("with-rvZknAes") action { (v, c) => addISA("zkne", "zknd") }
    opt[Unit]("with-sxaia") action { (v, c) => addISA("smaia", "ssaia") }
    opt[Int]("imsic-interrupt-number") action { (v, c) => privParam.imsicInterrupts = v }
    opt[Int]("guest-external-interrupt-file-number") action { (v, c) => privParam.guestExternalInterruptFiles = v }
    opt[Unit]("without-external-interrupt") action { (v, c) => privParam.withExternalInterrupt = false }
    opt[Unit]("with-whiteboxer-outputs") action { (v, c) => withWhiteboxerOutputs = true }
    opt[Unit]("with-hart-id-input") action { (v, c) => withHartIdInput = true }
    opt[Unit]("with-hart-id-input-defaulted") action { (v, c) => privParam.withHartIdInputDefaulted = true }
    opt[Unit]("fma-reduced-accuracy") action { (v, c) => fpuMulParam.fmaFullAccuracy = false }
    opt[Unit]("fpu-ignore-subnormal") action { (v, c) => fpuIgnoreSubnormal = true }
    opt[Unit]("with-aligner-buffer").unbounded() action { (v, c) => withAlignerBuffer = true }
    opt[Unit]("with-dispatcher-buffer") action { (v, c) => withDispatcherBuffer = true }
    opt[Unit]("with-hypervisor") action { (v, c) => addISA("h", "s", "u") }
    opt[Unit]("with-supervisor") action { (v, c) => addISA("s", "u") }
    opt[Unit]("with-user") action { (v, c) => addISA("u") }
    opt[Unit]("without-mmu") action { (v, c) => disableMmu = true }
    opt[Unit]("without-mul") action { (v, c) => removeISA("m", "zmmul") }
    opt[Unit]("without-div") action { (v, c) => if(checkISA("m")) {removeISA("m"); addISA("zmmul")} }
    opt[Unit]("with-tester-plugin") action { (v, c) => withTesterPlugin = true }
    opt[Unit]("with-mul").unbounded() action { (v, c) => addISA("zmmul") }
    opt[Unit]("with-div").unbounded() action { (v, c) => addISA("m") }
    opt[Unit]("with-gshare") action { (v, c) => withGShare = true }
    opt[Unit]("with-btb") action { (v, c) => withBtb = true }
    opt[Unit]("with-ras") action { (v, c) => withRas = true }
    opt[Unit]("without-ras") action { (v, c) => withRas = false }
    opt[Int]("gshare-banks") action { (v, c) => gshareBanks = v }
    opt[Unit]("btb-single-port-ram") action { (v, c) => btbDualPortRam = false }
    opt[Unit]("with-late-alu") action { (v, c) => withLateAlu = true; allowBypassFrom = 0; storeRs2Late = true }
    opt[Unit]("with-store-rs2-late") action { (v, c) => storeRs2Late = true }
    opt[Unit]("without-late-alu") action { (v, c) => withLateAlu = false; storeRs2Late = false }
    opt[Int]("btb-sets") action { (v, c) => btbSets = v }
    opt[Int]("btb-hash-width") action { (v, c) => btbHashWidth = v }
    opt[Unit]("regfile-async") action { (v, c) => regFileSync = false }
    opt[Unit]("regfile-sync") action { (v, c) => regFileSync = true }
    opt[Unit]("regfile-dual-ports") action { (v, c) => regFileDualPortRam = true }
    opt[Unit]("regfile-infer-ports") action { (v, c) => regFileDualPortRam = false }
    opt[Unit]("regfile-reg-based") action { (v, c) => regFileRegBasedRam = true; regFileDualPortRam = false}
    opt[Int]("allow-bypass-from") action { (v, c) => allowBypassFrom = v }
    opt[Unit]("with-indirect-csr") action { (v, c) => addISA("smcsrind", "sscsrind") }
    opt[Int]("performance-counters").unbounded() action { (v, c) => addISA("zicntr", "zihpm"); additionalPerformanceCounters = v }
    opt[Unit]("without-performance-scountovf").unbounded() action { (v, c) => removeISA("sscofpmf") }
    opt[Unit]("with-fetch-l1").unbounded() action { (v, c) => fetchL1Enable = true }
    opt[Unit]("with-lsu-l1") action { (v, c) => lsuL1Enable = true }
    opt[Unit]("fetch-axi4") action { (v, c) => fetchBus = FetchBusEnum.axi4 }
    opt[Unit]("fetch-wishbone") action { (v, c) => fetchBus = FetchBusEnum.wishbone }
    opt[Unit]("lsu-axi4") action { (v, c) => lsuBus = LsuBusEnum.axi4 }
    opt[Unit]("lsu-wishbone") action { (v, c) => lsuBus = LsuBusEnum.wishbone }
    opt[Unit]("lsu-l1-axi4") action { (v, c) => lsuL1Bus = LsuL1BusEnum.axi4 }
    opt[Unit]("lsu-l1-wishbone") action { (v, c) => lsuL1Bus = LsuL1BusEnum.wishbone }
    opt[Unit]("fetch-l1") action { (v, c) => fetchL1Enable = true }
    opt[Unit]("lsu-l1") action { (v, c) => lsuL1Enable = true }
    opt[Int]("fetch-l1-sets").unbounded() action { (v, c) => fetchL1Sets = v }
    opt[Int]("fetch-l1-ways").unbounded() action { (v, c) => fetchL1Ways = v }
    opt[Int]("fetch-l1-refill-count").unbounded() action { (v, c) => fetchL1RefillCount = v }
    opt[Unit]("fetch-l1-tags-read-async") action { (v, c) =>  fetchL1TagsReadAsync = true }
    opt[String]("fetch-l1-hardware-prefetch") action { (v, c) => fetchL1Prefetch = v }
    opt[Int]("fetch-l1-mem-data-width-min").unbounded() action { (v, c) => fetchMemDataWidthMin = v }
    opt[Unit]("fetch-reduced-bank") action { (v, c) => fetchL1ReducedBank = true }
    opt[Int]("lsu-l1-sets").unbounded() action { (v, c) => lsuL1Sets = v }
    opt[Int]("lsu-l1-ways").unbounded() action { (v, c) => lsuL1Ways = v }
    opt[Int]("lsu-l1-store-buffer-slots") action { (v, c) => lsuStoreBufferSlots = v }
    opt[Int]("lsu-l1-store-buffer-ops") action { (v, c) => lsuStoreBufferOps = v }
    opt[Unit]("lsu-l1-tags-read-async") action { (v, c) =>  lsuL1TagsReadAsync = true }
    opt[String]("lsu-hardware-prefetch") action { (v, c) => lsuHardwarePrefetch = v }
    opt[Unit]("lsu-software-prefetch") action { (v, c) => lsuSoftwarePrefetch = true }
    opt[Int]("lsu-rpt-block-ahead-max") action { (v, c) => prefetcherRptParam.blockAheadMax = v }
    opt[Int]("lsu-l1-refill-count") action { (v, c) => lsuL1RefillCount = v }
    opt[Int]("lsu-l1-writeback-count") action { (v, c) => lsuL1WritebackCount = v }
    opt[Int]("lsu-l1-mem-data-width-min").unbounded() action { (v, c) => lsuMemDataWidthMin = v }
    opt[Unit]("lsu-l1-coherency") action { (v, c) => lsuL1Coherency = true}
    opt[Unit]("with-lsu-bypass") action { (v, c) => withLsuBypass = true }
    opt[Unit]("without-lsu-bypass") action { (v, c) => withLsuBypass = false }
    opt[Unit]("with-iterative-shift") action { (v, c) => withIterativeShift = true }
    opt[Int]("div-radix") action { (v, c) => divRadix = v }
    opt[String]("div-impl") action { (v, c) => divImpl = v }
    opt[Unit]("div-ipc") action { (v, c) => divArea = false }
    opt[Int]("fetch-fork-at") action { (v, c) => fetchForkAt = v }
    opt[Int]("lsu-fork-at") action { (v, c) => lsuForkAt = v }
    opt[Int]("lsu-pma-at") action { (v, c) => lsuPmaAt = v }
    opt[Unit]("debug-privileged") action { (v, c) => privParam.withDebug = true }
    opt[Int] ("debug-triggers") action { (v, c) => privParam.debugTriggers = v }
    opt[Unit]("debug-triggers-lsu") action { (v, c) => privParam.debugTriggersLsu = true }
    opt[Unit]("debug-jtag-tap") action { (v, c) => embeddedJtagTap = true; privParam.withDebug = true }
    opt[Unit]("debug-jtag-instruction") action { (v, c) => embeddedJtagInstruction = true; privParam.withDebug = true }
    opt[Unit]("with-boot-mem-init") action { (v, c) => bootMemClear = true }
    opt[Int]("physical-width") action { (v, c) => physicalWidth = v }
    opt[Unit]("mul-keep-src") action { (v, c) => mulKeepSrc = true }
    opt[Unit]("mmu-sync-read") action { (v, c) => withMmuSyncRead() }
    opt[Int]("pmp-size") action { (v, c) => pmpParam.pmpSize = v }
    opt[Int]("pmp-granularity") action { (v, c) => pmpParam.granularity = v }
    opt[Unit]("pmp-tor-disable") action { (v, c) => pmpParam.withTor = false }
    opt[Unit]("with-rdtime") action { (v, c) => addISA("zicntr") }
    opt[Unit]("with-sstc") action { (v, c) => addISA("sstc") }
    opt[Unit]("with-cfu") action { (v, c) => withCfu = true }
    opt[Int]("asid-width") action{ (v,c) => asidWidth = v }
    opt[Int]("gshare-bytes") action{ (v,c) => gshareBytes = v }
    opt[Unit]("record-htinst") action{ (v, c) => recordHtinst = true }
    opt[Int]("injected-guest-interrupt-width") action { (v, c) => privParam.injectedInterruptWidth = v }
    opt[Unit]("dual-issue") action { (v, c) =>
      decoders = 2
      lanes = 2
    }
    opt[Unit]("max-ipc") action { (v, c) =>
      withBtb = true
      withGShare = true
      withRas = true
      allowBypassFrom = 0
      divRadix = 4
      withLateAlu = true
      if(lanes > 1) {
        withAlignerBuffer = true
        withDispatcherBuffer = true
      }
      lsuMemDataWidthMin = 64
      lsuL1Sets = 64
      lsuL1Ways = 4
      lsuL1RefillCount = 8
      lsuL1WritebackCount = 8
      lsuStoreBufferSlots = 4
      lsuStoreBufferOps = 32
      withLsuBypass = true
      lsuSoftwarePrefetch = true
      lsuHardwarePrefetch = "rpt"
    }
    checkConfig(c => {
      fixIsaParams()
      success
    })
  }

  // Generate the VexiiRiscv plugin list out of the current SimpleParam configuration
  def plugins(hartId : Int = 0) = pluginsArea(hartId).plugins
  def pluginsArea(hartId : Int = 0) = new Area {
    val plugins = ArrayBuffer[Hostable]()
    if(withLateAlu) assert(allowBypassFrom == 0)
    if(withMmu && lsuL1Enable) assert(lsuL1Sets <= 64, "MMU require not more than 64 sets in the LSU L1")
    if(withMmu && fetchL1Enable) assert(fetchL1Sets <= 64, "MMU require not more than 64 sets in the FETCH L1")

    val intWritebackAt = 2 + extension.withRvh.toInt //Alias for "trap at" as well

    plugins += new riscv.RiscvPlugin(xlen, hartCount, isa = extension.getIsaNameArray(includeIgnored = true).toSet)
    if (withMmu) plugins += new TranslatedDBusAccessPlugin()
    withMmu match {
      case false => plugins += new vexiiriscv.memory.StaticTranslationPlugin(physicalWidth)
      case true => plugins += new vexiiriscv.memory.MmuPlugin(
        spec = if (xlen == 32) MmuSpec.sv32 else MmuSpec.sv39,
        physicalWidth = physicalWidth,
        asidWidth = asidWidth,
        withGuestSfenceCheck = extension.withHypervisor
      )
    }
    (extension.withRvh && withMmu) match {
      case false => plugins += new vexiiriscv.memory.StaticTranslationPlugin(physicalWidth, 1)
      case true => plugins += new vexiiriscv.memory.ShadowMmuPlugin(
        spec = if (xlen == 32) MmuSpec.sv32 else MmuSpec.sv39,
        physicalWidth = physicalWidth,
        vmidWidth = 0 /* TODO */
      )
    }

    plugins += new PmpPlugin(pmpParam)

    plugins += new vexiiriscv.misc.PipelineBuilderPlugin()
    plugins += new schedule.ReschedulePlugin()

    // Branch prediction
    plugins += new LearnPlugin()
    if(withRas) assert(withBtb)
    if(withGShare) assert(withBtb)
    if(withBtb) {
      plugins += new prediction.BtbPlugin(
        sets = btbSets / decoders,
        chunks = decoders,
        dualPortRam = btbDualPortRam,
        rasDepth = if(withRas) 4 else 0,
        hashWidth = btbHashWidth,
        readAt = 0,
        hitAt = 1+relaxedBtbHit.toInt,
        jumpAt = 1+relaxedBtb.toInt,
        bootMemClear = bootMemClear
      )
    }
    if(withGShare) {
      plugins += new prediction.GSharePlugin (
        memBytes = gshareBytes,
        historyWidth = 12,
        readAt = 0,
        bootMemClear = bootMemClear,
        banksCount = gshareBanks
      )
      plugins += new prediction.HistoryPlugin()
    }
    def shifter(layer: LaneLayer, shiftAt: Int = 0, formatAt: Int = 0) = withIterativeShift match {
      case false => new BarrelShifterPlugin(layer, with_slli_uw=extension.withZba, shiftAt=shiftAt, formatAt=formatAt)
      case true => new IterativeShifterPlugin(layer, with_slli_uw=extension.withZba, shiftAt=shiftAt, formatAt=formatAt)
    }


    // Fetch
    plugins += new fetch.PcPlugin(resetVector)
    plugins += new fetch.FetchPipelinePlugin()
    if(!fetchL1Enable) {
      plugins += new fetch.FetchCachelessPlugin(
        timingParameter = extension.withRvh match {
          case true => fetchCachelessHypervisorTiming
          case false => fetchCachelessTiming
        },
        wordWidth = fetchMemDataWidth,
        pmpPortParameter = fetchNoL1PmpParam.offset(extension.withRvh.toInt),
        translationStorageParameter = fetchTsp,
        translationPortParameter = withMmu match {
          case false => null
          case true => MmuPortParameter(
            readAt = 0,
            hitsAt = 0,
            ctrlAt = 0,
            rspAt = 0
          )
        }
      )
      fetchBus match {
        case FetchBusEnum.native =>
        case FetchBusEnum.axi4 => plugins += new FetchCachelessAxi4Plugin()
        case FetchBusEnum.wishbone => plugins += new FetchCachelessWishbonePlugin()
      }
    }

    if(fetchL1Enable) {
      plugins += new fetch.FetchL1Plugin(
        lineSize = 64,
        setCount = fetchL1Sets,
        wayCount = fetchL1Ways,
        refillCount = fetchL1RefillCount,
        fetchDataWidth = 32*decoders,
        memDataWidth = fetchMemDataWidth,
        reducedBankWidth = fetchL1ReducedBank,
        hitsWithTranslationWays = true,
        tagsReadAsync = fetchL1TagsReadAsync,
        bootMemClear = bootMemClear,
        translationStorageParameter = fetchTsp,
        translationPortParameter = withMmu match {
          case false => null
          case true => fetchTpp
        },
        pmpPortParameter = fetchL1PmpParam.offset(extension.withRvh.toInt),
        timingParameter = extension.withRvh match {
          case true => fetchL1HypervisorTiming
          case false => fetchL1Timing
        }
      )

      fetchL1Prefetch match {
        case "none" =>
        case "nl" => {
          plugins += new fetch.PrefetcherNextLinePlugin(64)
          assert(fetchL1RefillCount > 1, "Fetch prefetch require fetchL1RefillCount > 1")
        }
      }


      fetchBus match {
        case FetchBusEnum.native =>
        case FetchBusEnum.axi4 => plugins += new FetchL1Axi4Plugin()
        case FetchBusEnum.wishbone => plugins += new FetchL1WishbonePlugin()
      }
    }
    plugins += new decode.DecodePipelinePlugin()
    plugins += new decode.AlignerPlugin(
      fetchAt = alignerPluginFetchAt,
      lanes = decoders,
      withBuffer = withAlignerBuffer
    )
    plugins += new decode.DecoderPlugin(
      decodeAt = decoderAt
    )
    plugins += new schedule.DispatchPlugin(
      dispatchAt = dispatcherAt,
      trapLayer = null,
      withBuffer = withDispatcherBuffer
    )

    plugins += new regfile.RegFilePlugin(
      spec = riscv.IntRegFile,
      physicalDepth = if(extension.withRve) 16 else 32,
      preferedWritePortForInit = "lane0",
      syncRead = regFileSync,
      dualPortRam = regFileDualPortRam,
      regBasedRam = regFileRegBasedRam,
      maskReadDuringWrite = false
    )

    def newExecuteLanePlugin(name : String) = new execute.ExecuteLanePlugin(
      name,
      rfReadAt = 0,
      decodeAt  = 0+regFileSync.toInt,
      executeAt = 0+regFileSync.toInt + 1,
      trapAt    = 0+regFileSync.toInt + 1 + intWritebackAt,
      withBypasses = allowBypassFrom == 0
    )
    plugins += new execute.ExecutePipelinePlugin()

    val lane0 = newExecuteLanePlugin("lane0")

    // Main execution pipeline
    val early0 = new LaneLayer("early0", lane0, priority = 0)
    plugins += lane0
    plugins += new SrcPlugin(early0, executeAt = 0, relaxedRs = relaxedSrc)
    plugins += new IntAluPlugin(early0, formatAt = 0)
    plugins += shifter(early0, formatAt = relaxedShift.toInt)
    plugins += new IntFormatPlugin(lane0)
    plugins += new BranchPlugin(layer=early0, aluAt=0, jumpAt=relaxedBranch.toInt, wbAt=0)
    if(withRvZknAes) plugins += new AesZknPlugin(layer = early0)
    if(withCfu) plugins += new CfuPlugin(
      layer = early0,
      forkAt = 0,
      joinAt = 2,
      allowZeroLatency = true,
      encodings = List(
        CfuPluginEncoding (
          instruction = M"-------------------------0001011",
          functionId = List(14 downto 12),
          input2Kind = CfuPlugin.Input2Kind.RS
        ),
        CfuPluginEncoding (
          instruction = M"-------------------------0101011",
          functionId = List(14 downto 12),
          input2Kind = CfuPlugin.Input2Kind.IMM_I
        )
      ),
      busParameter = CfuBusParameter(
        CFU_VERSION = 0,
        CFU_INTERFACE_ID_W = 0,
        CFU_FUNCTION_ID_W = 3,
        CFU_REORDER_ID_W = 0,
        CFU_REQ_RESP_ID_W = 0,
        CFU_INPUTS = 2,
        CFU_INPUT_DATA_W = xlen,
        CFU_OUTPUTS = 1,
        CFU_OUTPUT_DATA_W = xlen,
        CFU_FLOW_REQ_READY_ALWAYS = false,
        CFU_FLOW_RESP_READY_ALWAYS = false,
        CFU_WITH_STATUS = true,
        CFU_RAW_INSN_W = 32,
        CFU_CFU_ID_W = 4,
        CFU_STATE_INDEX_NUM = 5
      )
    )

    plugins ++= ZbPlugin.make(
      early0,
      zba = extension.withZba,
      zbb = extension.withZbb,
      zbc = extension.withZbc,
      zbs = extension.withZbs,
      executeAt=0,
      formatAt=0
    )

    lsuBus match {
      case LsuBusEnum.native =>
      case LsuBusEnum.axi4 => plugins += new LsuCachelessAxi4Plugin()
      case LsuBusEnum.wishbone => plugins += new LsuCachelessWishbonePlugin()
    }

    if(!lsuL1Enable) {
      plugins += new LsuCachelessPlugin(
        layer     = early0,
        withZaamo = extension.withZaamo,
        withZalrsc = extension.withZalrsc,
        withSpeculativeLoadFlush = true,
        timingParameter = extension.withRvh match {
          case true => lsuCachelessHypervisorTiming
          case false => lsuCachelessTiming
        },
        pmpPortParameter = lsuNoL1PmpParam.offset(extension.withRvh.toInt),
        translationStorageParameter = lsuTsp,
        translationPortParameter = withMmu match {
          case false => null
          case true => MmuPortParameter(
            readAt = 0,
            hitsAt = 0,
            ctrlAt = 0,
            rspAt = 0
          )
        }
      )
    }
    if(lsuL1Enable){
      val needLlc = extension.withZicbom && (withRvcbmLlc || lsuL1Coherency)
      plugins += new LsuPlugin(
        timingParameter = extension.withRvh match {
          case true => lsuHypervisorTiming
          case false => lsuTiming
        },
        layer = early0,
        withZaamo = extension.withZaamo,
        withZalrsc = extension.withZalrsc,
        storeRs2At = storeRs2Late.mux(2, 0),
        storeBufferSlots = lsuStoreBufferSlots,
        storeBufferOps = lsuStoreBufferOps,
        softwarePrefetch = lsuSoftwarePrefetch,
        withCbm = extension.withZicbom,
        withLlcFlush = needLlc,
        pmpPortParameter = lsuL1PmpParam.offset(extension.withRvh.toInt),
        translationStorageParameter = lsuTsp,
        translationPortParameter = withMmu match {
          case false => null
          case true => lsuTpp
        }
      )
      plugins += new LsuL1Plugin(
        lane           = lane0,
        memDataWidth   = lsuMemDataWidth,
        cpuDataWidth   = xlen max extension.withRvd.mux(64, 0),
        refillCount    = lsuL1RefillCount,
        writebackCount = lsuL1WritebackCount,
        setCount       = lsuL1Sets,
        wayCount       = lsuL1Ways,
        withBypass     = withLsuBypass,
        withCoherency  = lsuL1Coherency,
        withCbm        = extension.withZicbom && !needLlc,
        bootMemClear = bootMemClear,
        tagsReadAsync  = lsuL1TagsReadAsync,
        timingParameter = extension.withRvh match {
          case true => lsuL1HypervisorTiming
          case false => lsuL1Timing
        }
      )

      lsuHardwarePrefetch match {
        case "none" =>
        case "nl" => plugins += new lsu.PrefetcherNextLinePlugin
        case "rpt" => plugins += new lsu.PrefetcherRptPlugin(
          p = prefetcherRptParam,
          bootMemClear = bootMemClear
        )
      }
      lsuL1Bus match {
        case LsuL1BusEnum.native =>
        case LsuL1BusEnum.axi4 => plugins += new LsuL1Axi4Plugin()
        case LsuL1BusEnum.wishbone => plugins += new LsuL1WishbonePlugin()
      }
    }

    if(extension.withMul) {
      plugins += new MulPlugin(early0, keepMulSrc = mulKeepSrc, mulAt = relaxedMulInputs.toInt)
    }
    if(extension.withDiv) {
      plugins += new RsUnsignedPlugin("lane0")
      plugins += new DivPlugin(
        layer = early0,
        relaxedInputs = xlen == 64 || relaxedDiv,
        radix = divRadix,
        area  = divArea,
        impl = {
          def pasta(width: Int, radix: Int, area : Boolean) = new DivRadix2(width, lowArea = area)
          def vexii(width: Int, radix: Int, area: Boolean) = new DivRadix(width, radix)
          def default(width: Int, radix: Int, area: Boolean) = vexii(width, radix, area)
          divImpl match {
            case "" => default
            case "bitpasta" => pasta
            case "vexii" => vexii
          }
        }
      )
    }

    plugins += new CsrRamPlugin()
    if(extension.withPerformanceCounters) plugins += new PerformanceCounterPlugin(
      additionalCounterCount  = additionalPerformanceCounters,
      withSmcntrpmf           = extension.withSmcntrpmf,
      withScountovf           = extension.withSscofpmf,
      withShlcofideleg        = extension.withShlcofideleg
    )
    plugins += new CsrAccessPlugin(early0, writeBackKey =  if(lanes == 1) "lane0" else "lane1")
    if(extension.withIndirectCsr) plugins += new IndirectCsrPlugin(extension.withSscsrind, privParam.withHypervisor && extension.withSscsrind)
    if(privParam.withImsic) plugins += new ImsicPlugin(privParam)
    plugins += new PrivilegedPlugin(privParam, withHartIdInput.mux(null, hartId until hartId+hartCount))
    plugins += new TrapPlugin(trapAt = intWritebackAt, recordHtinst = recordHtinst)
    if(withTesterPlugin) plugins += new TesterPlugin()
    plugins += new EnvPlugin(early0, executeAt = 0)
    if(embeddedJtagTap || embeddedJtagInstruction) plugins += new EmbeddedRiscvJtag(
      p = DebugTransportModuleParameter(
        addressWidth = 7,
        version = 1,
        idle = 7
      ),
      withTunneling = false,
      withTap = embeddedJtagTap,
      debugCd = embeddedJtagCd,
      noTapCd = embeddedJtagNoTapCd
    )

    val lateAluAt = intWritebackAt

    // Late ALU in the main execution pipeline
    if(withLateAlu) {
      val late0 = new LaneLayer("late0", lane0, priority = -5)
      plugins += new SrcPlugin(late0, executeAt = lateAluAt, relaxedRs = relaxedSrc)
      plugins += new IntAluPlugin(late0, aluAt = lateAluAt, formatAt = lateAluAt)
      plugins += shifter(late0, shiftAt = lateAluAt, formatAt = lateAluAt)
      plugins += new BranchPlugin(late0, aluAt = lateAluAt, jumpAt = lateAluAt/*+relaxedBranch.toInt*/, wbAt = lateAluAt, withJalr = false)
      plugins ++= ZbPlugin.make(
        late0,
        zba = extension.withZba,
        zbb = extension.withZbb,
        zbc = extension.withZbc,
        zbs = extension.withZbs,
        executeAt=lateAluAt,
        formatAt=lateAluAt
      )
    }

    plugins += new WriteBackPlugin(lane0, IntRegFile, writeAt = withLateAlu.mux(lateAluAt, intWritebackAt), allowBypassFrom = allowBypassFrom)

    // Second execution pipeline (dual-issue configs)
    if(lanes >= 2) {
      val lane1 = newExecuteLanePlugin("lane1")
      val early1 = new LaneLayer("early1", lane1, priority = 10)
      plugins += lane1

      plugins += new SrcPlugin(early1, executeAt = 0, relaxedRs = relaxedSrc)
      plugins += new IntAluPlugin(early1, formatAt = 0)
      plugins += shifter(early1, formatAt = relaxedShift.toInt)
      plugins += new IntFormatPlugin(lane1)
      plugins += new BranchPlugin(early1, aluAt = 0, jumpAt = relaxedBranch.toInt, wbAt = 0)
      plugins ++= ZbPlugin.make(
        early1,
        zba = extension.withZba,
        zbb = extension.withZbb,
        zbc = extension.withZbc,
        zbs = extension.withZbs,
        executeAt=0,
        formatAt=0
      )

      // Late ALU in the Second execution pipeline
      if(withLateAlu) {
        val late1 = new LaneLayer("late1", lane1, priority = -3)
        plugins += new SrcPlugin(late1, executeAt = lateAluAt, relaxedRs = relaxedSrc)
        plugins += new IntAluPlugin(late1, aluAt = lateAluAt, formatAt = lateAluAt)
        plugins += shifter(late1, shiftAt = lateAluAt, formatAt = lateAluAt)
        plugins += new BranchPlugin(late1, aluAt = lateAluAt, jumpAt = lateAluAt/*+relaxedBranch.toInt*/, wbAt = lateAluAt, withJalr = false)
        plugins ++= ZbPlugin.make(
          late1,
          zba = extension.withZba,
          zbb = extension.withZbb,
          zbc = extension.withZbc,
          zbs = extension.withZbs,
          executeAt=lateAluAt,
          formatAt=lateAluAt
        )
      }
//      if (withMul) {
//        plugins += new MulPlugin(early1)
//      }
      plugins += new WriteBackPlugin(lane1, IntRegFile, writeAt = withLateAlu.mux(lateAluAt, intWritebackAt), allowBypassFrom = allowBypassFrom)
    }

    plugins.foreach {
      case p: DispatchPlugin => p.trapLayer = early0
      case _ =>
    }

    // FPU
    if (extension.withRvf || extension.withRvd) {
      plugins += new regfile.RegFilePlugin(
        spec = riscv.FloatRegFile,
        physicalDepth = 32,
        preferedWritePortForInit = "lane0",
        syncRead = regFileSync,
        dualPortRam = regFileDualPortRam,
        regBasedRam = regFileRegBasedRam,
        maskReadDuringWrite = false
      )
      plugins += new WriteBackPlugin(lane0, FloatRegFile, writeAt = 9, allowBypassFrom = allowBypassFrom.max(2)) //Max 2 to save area on not so important instructions
      plugins += new execute.fpu.FpuFlagsWritebackPlugin(lane0, pipTo = intWritebackAt)
      plugins += new execute.fpu.FpuCsrPlugin(List(lane0), intWritebackAt)
      plugins += new execute.fpu.FpuUnpackerPlugin(early0, ignoreSubnormal = fpuIgnoreSubnormal)
      plugins += new execute.fpu.FpuAddSharedPlugin(lane0, p = fpuAddSharedParam)
      plugins += new execute.fpu.FpuAddPlugin(early0)
      plugins += new execute.fpu.FpuMulPlugin(early0, p = fpuMulParam)
      plugins += new execute.fpu.FpuSqrtPlugin(early0)
      plugins += new execute.fpu.FpuClassPlugin(early0)
      plugins += new execute.fpu.FpuCmpPlugin(early0)
      plugins += new execute.fpu.FpuF2iPlugin(early0)
      plugins += new execute.fpu.FpuMvPlugin(early0, floatWbAt = 2)
      if(extension.withRvd) plugins += new execute.fpu.FpuXxPlugin(early0)
      plugins += new execute.fpu.FpuDivPlugin(early0)
      plugins += new execute.fpu.FpuPackerPlugin(lane0, ignoreSubnormal = fpuIgnoreSubnormal, wbAt = fpuWbAt)
    }

    plugins += new WhiteboxerPlugin(
      withOutputs = withWhiteboxerOutputs
    )
  }
}

/*
jump at 0 :       dhrystone coremark   embench
1l btb gshare ras => 1.64     3.26      1.04
       + late alu => 1.72     3.54      1.10
2l btb gshare ras => 1.92     3.93      1.34
       + late alu => 2.09     4.39
    + 4b late alu => 2.24     4.55      1.47
    + aligner buf => 2.29     4.70      1.50
    + ali/dis buf => 2.46     4.80      1.59

cached
0.98 1l la rbtb Geometric mean
1.00 1l Geometric mean
1.07 1l la Geometric mean
1.39 2l Geometric mean
1.55 2l la Geometric mean



jump at 1
1l btb gshare ras => 1.64 dhrystone 3.21 coremark 1.03 embench
2l btb gshare ras => 1.91 dhrystone 3.83 coremark 1.32 embench

 coremark 2l => Branch : 523630 47815   9.1%

btb ras gshare at 1 :
vexii_1i ->
Artix 7 -> 90 Mhz 1619 LUT 1038 FF
Artix 7 -> 166 Mhz 2423 LUT 1091 FF
vexii_2i ->
Artix 7 -> 90 Mhz 2658 LUT 1314 FF
Artix 7 -> 134 Mhz 3136 LUT 1370 FF

btb ras gshare at 2 :
vexii_1i ->
Artix 7 -> 90 Mhz 1554 LUT 1045 FF
Artix 7 -> 196 Mhz 1705 LUT 1045 FF
vexii_2i -> embench 1.21
Artix 7 -> 90 Mhz 2808 LUT 1349 FF
Artix 7 -> 137 Mhz 2949 LUT 1352 FF

  -mtune=sifive-7-series
1.51
3.11

1.51
3.20

dual issue, btb, no gshare =>

1.74 Dhrystone/MHz
3.66 Coremark/MHz
aha-mont64           1.41
crc32                1.00
cubic                0.60
edn                  1.08
huffbench            1.46
matmult-int          1.01
md5sum               1.82
minver               0.81
nbody                1.01
nettle-aes           1.53
nettle-sha256        1.61
nsichneu             0.79
picojpeg             1.14
primecount           1.46
qrduino              1.41
sglib-combined       1.21
slre                 1.54
st                   1.21
statemate            1.96
tarfind              2.05
ud                   1.15
wikisort             1.78
---------           -----
Geometric mean       1.26


vexii_1i ->
Artix 7 -> 90 Mhz 1466 LUT 907 FF
Artix 7 -> 189 Mhz 1946 LUT 960 FF
vexii_2i ->
Artix 7 -> 90 Mhz 2596 LUT 1153 FF
Artix 7 -> 135 Mhz 3136 LUT 1207 FF

vexii_1i ->
Artix 7 -> 90 Mhz 1054 LUT 737 FF
Artix 7 -> 193 Mhz 1498 LUT 789 FF
vexii_2i ->
Artix 7 -> 90 Mhz 2271 LUT 980 FF
Artix 7 -> 133 Mhz 2777 LUT 1033 FF




lane micro op spec
- For each impl
  - readRsFrom
  - rd bypass from (executeId)
  - completion at (probe)
  - mayFlushUpTo
  - dontFlushFrom
 */
