xref: /XiangShan/src/main/scala/xiangshan/mem/Bundles.scala (revision 638f3d8429609e2b12910be9517567bfe619e90e)

/***************************************************************************************
* Copyright (c) 2024 Beijing Institute of Open Source Chip (BOSC)
* Copyright (c) 2020-2024 Institute of Computing Technology, Chinese Academy of Sciences
* Copyright (c) 2020-2021 Peng Cheng Laboratory
*
* XiangShan is licensed under Mulan PSL v2.
* You can use this software according to the terms and conditions of the Mulan PSL v2.
* You may obtain a copy of Mulan PSL v2 at:
*          http://license.coscl.org.cn/MulanPSL2
*
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
*
* See the Mulan PSL v2 for more details.
***************************************************************************************/

package xiangshan.mem


import org.chipsalliance.cde.config.Parameters
import chisel3._
import chisel3.util._
import utility._
import utils._
import xiangshan._
import xiangshan.backend.Bundles._
import xiangshan.backend.rob.RobPtr
import xiangshan.backend.fu.FenceToSbuffer
import xiangshan.backend.fu.vector.Bundles._
import xiangshan.backend.Bundles._
import xiangshan.mem.prefetch.PrefetchReqBundle
import xiangshan.cache._
import xiangshan.cache.wpu.ReplayCarry
import xiangshan.cache.mmu._
import math._

object Bundles {

  class LsPipelineBundle(implicit p: Parameters) extends XSBundle
    with HasDCacheParameters
    with HasVLSUParameters {
    val uop = new DynInst
    val vaddr = UInt(VAddrBits.W)
    // For exception vaddr generate
    val fullva = UInt(XLEN.W)
    val vaNeedExt = Bool()
    val isHyper = Bool()
    val paddr = UInt(PAddrBits.W)
    val gpaddr = UInt(XLEN.W)
    val isForVSnonLeafPTE = Bool()
    // val func = UInt(6.W)
    val mask = UInt((VLEN/8).W)
    val data = UInt((VLEN+1).W)
    val wlineflag = Bool() // store write the whole cache line

    val miss = Bool()
    val tlbMiss = Bool()
    val ptwBack = Bool()
    val af = Bool()
    val nc = Bool()
    val mmio = Bool()
    val memBackTypeMM = Bool() // 1: main memory, 0: IO
    val atomic = Bool()
    val hasException = Bool()

    val forwardMask = Vec(VLEN/8, Bool())
    val forwardData = Vec(VLEN/8, UInt(8.W))

    // prefetch
    val isPrefetch = Bool()
    val isHWPrefetch = Bool()
    def isSWPrefetch = isPrefetch && !isHWPrefetch

    // misalignBuffer
    val isFrmMisAlignBuf = Bool()

    // vector
    val isvec = Bool()
    val isLastElem = Bool()
    val is128bit = Bool()
    val uop_unit_stride_fof = Bool()
    val usSecondInv = Bool()
    val elemIdx = UInt(elemIdxBits.W)
    val alignedType = UInt(alignTypeBits.W)
    val mbIndex = UInt(max(vlmBindexBits, vsmBindexBits).W)
    // val rob_idx_valid = Vec(2,Bool())
    // val inner_idx = Vec(2,UInt(3.W))
    // val rob_idx = Vec(2,new RobPtr)
    val reg_offset = UInt(vOffsetBits.W)
    val elemIdxInsideVd = UInt(elemIdxBits.W)
    // val offset = Vec(2,UInt(4.W))
    val vecActive = Bool() // 1: vector active element or scala mem operation, 0: vector not active element
    val is_first_ele = Bool()
    val vecBaseVaddr = UInt(VAddrBits.W)
    val vecVaddrOffset = UInt(VAddrBits.W)
    val vecTriggerMask = UInt((VLEN/8).W)
    // val flowPtr = new VlflowPtr() // VLFlowQueue ptr
    // val sflowPtr = new VsFlowPtr() // VSFlowQueue ptr

    // For debug usage
    val isFirstIssue = Bool()
    val hasROBEntry = Bool()

    // For load replay
    val isLoadReplay = Bool()
    val isFastPath = Bool()
    val isFastReplay = Bool()
    val replayCarry = new ReplayCarry(nWays)

    // For dcache miss load
    val mshrid = UInt(log2Up(cfg.nMissEntries).W)
    val handledByMSHR = Bool()
    val replacementUpdated = Bool()
    val missDbUpdated = Bool()

    val forward_tlDchannel = Bool()
    val dcacheRequireReplay = Bool()
    val delayedLoadError = Bool()
    val lateKill = Bool()
    val feedbacked = Bool()
    val ldCancel = ValidUndirectioned(UInt(log2Ceil(LoadPipelineWidth).W))
    // loadQueueReplay index.
    val schedIndex = UInt(log2Up(LoadQueueReplaySize).W)
    // hardware prefetch and fast replay no need to query tlb
    val tlbNoQuery = Bool()

    // misalign
    val isMisalign          = Bool()
    val isFinalSplit        = Bool()
    val misalignWith16Byte  = Bool()
    val misalignNeedWakeUp  = Bool()
    val updateAddrValid     = Bool()
  }

  class LdPrefetchTrainBundle(implicit p: Parameters) extends LsPipelineBundle {
    val meta_prefetch = UInt(L1PfSourceBits.W)
    val meta_access = Bool()

    def fromLsPipelineBundle(input: LsPipelineBundle, latch: Boolean = false, enable: Bool = true.B) = {
      if (latch) vaddr := RegEnable(input.vaddr, enable) else vaddr := input.vaddr
      if (latch) fullva := RegEnable(input.fullva, enable) else fullva := input.fullva
      if (latch) vaNeedExt := RegEnable(input.vaNeedExt, enable) else vaNeedExt := input.vaNeedExt
      if (latch) isHyper := RegEnable(input.isHyper, enable) else isHyper := input.isHyper
      if (latch) paddr := RegEnable(input.paddr, enable) else paddr := input.paddr
      if (latch) gpaddr := RegEnable(input.gpaddr, enable) else gpaddr := input.gpaddr
      if (latch) isForVSnonLeafPTE := RegEnable(input.isForVSnonLeafPTE, enable) else isForVSnonLeafPTE := input.isForVSnonLeafPTE
      if (latch) mask := RegEnable(input.mask, enable) else mask := input.mask
      if (latch) data := RegEnable(input.data, enable) else data := input.data
      if (latch) uop := RegEnable(input.uop, enable) else uop := input.uop
      if (latch) wlineflag := RegEnable(input.wlineflag, enable) else wlineflag := input.wlineflag
      if (latch) miss := RegEnable(input.miss, enable) else miss := input.miss
      if (latch) tlbMiss := RegEnable(input.tlbMiss, enable) else tlbMiss := input.tlbMiss
      if (latch) ptwBack := RegEnable(input.ptwBack, enable) else ptwBack := input.ptwBack
      if (latch) af := RegEnable(input.af, enable) else af := input.af
      if (latch) nc := RegEnable(input.nc, enable) else nc := input.nc
      if (latch) mmio := RegEnable(input.mmio, enable) else mmio := input.mmio
      if (latch) memBackTypeMM := RegEnable(input.memBackTypeMM, enable) else memBackTypeMM := input.memBackTypeMM
      if (latch) forwardMask := RegEnable(input.forwardMask, enable) else forwardMask := input.forwardMask
      if (latch) forwardData := RegEnable(input.forwardData, enable) else forwardData := input.forwardData
      if (latch) isPrefetch := RegEnable(input.isPrefetch, enable) else isPrefetch := input.isPrefetch
      if (latch) isHWPrefetch := RegEnable(input.isHWPrefetch, enable) else isHWPrefetch := input.isHWPrefetch
      if (latch) isFrmMisAlignBuf := RegEnable(input.isFrmMisAlignBuf, enable) else isFrmMisAlignBuf := input.isFrmMisAlignBuf
      if (latch) isFirstIssue := RegEnable(input.isFirstIssue, enable) else isFirstIssue := input.isFirstIssue
      if (latch) hasROBEntry := RegEnable(input.hasROBEntry, enable) else hasROBEntry := input.hasROBEntry
      if (latch) dcacheRequireReplay := RegEnable(input.dcacheRequireReplay, enable) else dcacheRequireReplay := input.dcacheRequireReplay
      if (latch) schedIndex := RegEnable(input.schedIndex, enable) else schedIndex := input.schedIndex
      if (latch) tlbNoQuery := RegEnable(input.tlbNoQuery, enable) else tlbNoQuery := input.tlbNoQuery
      if (latch) isvec               := RegEnable(input.isvec, enable)               else isvec               := input.isvec
      if (latch) isLastElem          := RegEnable(input.isLastElem, enable)          else isLastElem          := input.isLastElem
      if (latch) is128bit            := RegEnable(input.is128bit, enable)            else is128bit            := input.is128bit
      if (latch) vecActive           := RegEnable(input.vecActive, enable)           else vecActive           := input.vecActive
      if (latch) is_first_ele        := RegEnable(input.is_first_ele, enable)        else is_first_ele        := input.is_first_ele
      if (latch) uop_unit_stride_fof := RegEnable(input.uop_unit_stride_fof, enable) else uop_unit_stride_fof := input.uop_unit_stride_fof
      if (latch) usSecondInv         := RegEnable(input.usSecondInv, enable)         else usSecondInv         := input.usSecondInv
      if (latch) reg_offset          := RegEnable(input.reg_offset, enable)          else reg_offset          := input.reg_offset
      if (latch) elemIdx             := RegEnable(input.elemIdx, enable)             else elemIdx             := input.elemIdx
      if (latch) alignedType         := RegEnable(input.alignedType, enable)         else alignedType         := input.alignedType
      if (latch) mbIndex             := RegEnable(input.mbIndex, enable)             else mbIndex             := input.mbIndex
      if (latch) elemIdxInsideVd     := RegEnable(input.elemIdxInsideVd, enable)     else elemIdxInsideVd     := input.elemIdxInsideVd
      if (latch) vecBaseVaddr        := RegEnable(input.vecBaseVaddr, enable)        else vecBaseVaddr        := input.vecBaseVaddr
      if (latch) vecVaddrOffset      := RegEnable(input.vecVaddrOffset, enable)      else vecVaddrOffset      := input.vecVaddrOffset
      if (latch) vecTriggerMask      := RegEnable(input.vecTriggerMask, enable)      else vecTriggerMask      := input.vecTriggerMask
      // if (latch) flowPtr             := RegEnable(input.flowPtr, enable)             else flowPtr             := input.flowPtr
      // if (latch) sflowPtr            := RegEnable(input.sflowPtr, enable)            else sflowPtr            := input.sflowPtr

      meta_prefetch := DontCare
      meta_access := DontCare
      forward_tlDchannel := DontCare
      mshrid := DontCare
      replayCarry := DontCare
      atomic := DontCare
      isLoadReplay := DontCare
      isFastPath := DontCare
      isFastReplay := DontCare
      handledByMSHR := DontCare
      replacementUpdated := DontCare
      missDbUpdated := DontCare
      delayedLoadError := DontCare
      lateKill := DontCare
      feedbacked := DontCare
      ldCancel := DontCare
    }

    def asPrefetchReqBundle(): PrefetchReqBundle = {
      val res = Wire(new PrefetchReqBundle)
      res.vaddr       := this.vaddr
      res.paddr       := this.paddr
      res.pc          := this.uop.pc
      res.miss        := this.miss
      res.pfHitStream := isFromStream(this.meta_prefetch)

      res
    }
  }

  class StPrefetchTrainBundle(implicit p: Parameters) extends LdPrefetchTrainBundle {}

  class LqWriteBundle(implicit p: Parameters) extends LsPipelineBundle {
    // load inst replay informations
    val rep_info = new LoadToLsqReplayIO
    val nc_with_data = Bool() // nc access with data
    // queue entry data, except flag bits, will be updated if writeQueue is true,
    // valid bit in LqWriteBundle will be ignored
    val data_wen_dup = Vec(6, Bool()) // dirty reg dup


    def fromLsPipelineBundle(input: LsPipelineBundle, latch: Boolean = false, enable: Bool = true.B) = {
      if(latch) vaddr := RegEnable(input.vaddr, enable) else vaddr := input.vaddr
      if(latch) fullva := RegEnable(input.fullva, enable) else fullva := input.fullva
      if(latch) vaNeedExt := RegEnable(input.vaNeedExt, enable) else vaNeedExt := input.vaNeedExt
      if(latch) isHyper := RegEnable(input.isHyper, enable) else isHyper := input.isHyper
      if(latch) paddr := RegEnable(input.paddr, enable) else paddr := input.paddr
      if(latch) gpaddr := RegEnable(input.gpaddr, enable) else gpaddr := input.gpaddr
      if(latch) isForVSnonLeafPTE := RegEnable(input.isForVSnonLeafPTE, enable) else isForVSnonLeafPTE := input.isForVSnonLeafPTE
      if(latch) mask := RegEnable(input.mask, enable) else mask := input.mask
      if(latch) data := RegEnable(input.data, enable) else data := input.data
      if(latch) uop := RegEnable(input.uop, enable) else uop := input.uop
      if(latch) wlineflag := RegEnable(input.wlineflag, enable) else wlineflag := input.wlineflag
      if(latch) miss := RegEnable(input.miss, enable) else miss := input.miss
      if(latch) tlbMiss := RegEnable(input.tlbMiss, enable) else tlbMiss := input.tlbMiss
      if(latch) ptwBack := RegEnable(input.ptwBack, enable) else ptwBack := input.ptwBack
      if(latch) mmio := RegEnable(input.mmio, enable) else mmio := input.mmio
      if(latch) atomic := RegEnable(input.atomic, enable) else atomic := input.atomic
      if(latch) forwardMask := RegEnable(input.forwardMask, enable) else forwardMask := input.forwardMask
      if(latch) forwardData := RegEnable(input.forwardData, enable) else forwardData := input.forwardData
      if(latch) isPrefetch := RegEnable(input.isPrefetch, enable) else isPrefetch := input.isPrefetch
      if(latch) isHWPrefetch := RegEnable(input.isHWPrefetch, enable) else isHWPrefetch := input.isHWPrefetch
      if(latch) isFrmMisAlignBuf := RegEnable(input.isFrmMisAlignBuf, enable) else isFrmMisAlignBuf := input.isFrmMisAlignBuf
      if(latch) isFirstIssue := RegEnable(input.isFirstIssue, enable) else isFirstIssue := input.isFirstIssue
      if(latch) hasROBEntry := RegEnable(input.hasROBEntry, enable) else hasROBEntry := input.hasROBEntry
      if(latch) isLoadReplay := RegEnable(input.isLoadReplay, enable) else isLoadReplay := input.isLoadReplay
      if(latch) isFastPath := RegEnable(input.isFastPath, enable) else isFastPath := input.isFastPath
      if(latch) isFastReplay := RegEnable(input.isFastReplay, enable) else isFastReplay := input.isFastReplay
      if(latch) mshrid := RegEnable(input.mshrid, enable) else mshrid := input.mshrid
      if(latch) forward_tlDchannel := RegEnable(input.forward_tlDchannel, enable) else forward_tlDchannel := input.forward_tlDchannel
      if(latch) replayCarry := RegEnable(input.replayCarry, enable) else replayCarry := input.replayCarry
      if(latch) dcacheRequireReplay := RegEnable(input.dcacheRequireReplay, enable) else dcacheRequireReplay := input.dcacheRequireReplay
      if(latch) schedIndex := RegEnable(input.schedIndex, enable) else schedIndex := input.schedIndex
      if(latch) handledByMSHR := RegEnable(input.handledByMSHR, enable) else handledByMSHR := input.handledByMSHR
      if(latch) replacementUpdated := RegEnable(input.replacementUpdated, enable) else replacementUpdated := input.replacementUpdated
      if(latch) missDbUpdated := RegEnable(input.missDbUpdated, enable) else missDbUpdated := input.missDbUpdated
      if(latch) delayedLoadError := RegEnable(input.delayedLoadError, enable) else delayedLoadError := input.delayedLoadError
      if(latch) lateKill := RegEnable(input.lateKill, enable) else lateKill := input.lateKill
      if(latch) feedbacked := RegEnable(input.feedbacked, enable) else feedbacked := input.feedbacked
      if(latch) isvec               := RegEnable(input.isvec, enable)               else isvec               := input.isvec
      if(latch) is128bit            := RegEnable(input.is128bit, enable)            else is128bit            := input.is128bit
      if(latch) vecActive           := RegEnable(input.vecActive, enable)           else vecActive           := input.vecActive
      if(latch) uop_unit_stride_fof := RegEnable(input.uop_unit_stride_fof, enable) else uop_unit_stride_fof := input.uop_unit_stride_fof
      if(latch) reg_offset          := RegEnable(input.reg_offset, enable)          else reg_offset          := input.reg_offset
      if(latch) mbIndex             := RegEnable(input.mbIndex, enable)             else mbIndex             := input.mbIndex
      if(latch) elemIdxInsideVd     := RegEnable(input.elemIdxInsideVd, enable)     else elemIdxInsideVd     := input.elemIdxInsideVd

      rep_info := DontCare
      data_wen_dup := DontCare
    }
  }

  class SqWriteBundle(implicit p: Parameters) extends LsPipelineBundle {
    val need_rep = Bool()
  }

  class LoadForwardQueryIO(implicit p: Parameters) extends XSBundle {
    val vaddr = Output(UInt(VAddrBits.W))
    val paddr = Output(UInt(PAddrBits.W))
    val mask = Output(UInt((VLEN/8).W))
    val uop = Output(new DynInst) // for replay
    val pc = Output(UInt(VAddrBits.W)) //for debug
    val valid = Output(Bool())

    val forwardMaskFast = Input(Vec((VLEN/8), Bool())) // resp to load_s1
    val forwardMask = Input(Vec((VLEN/8), Bool())) // resp to load_s2
    val forwardData = Input(Vec((VLEN/8), UInt(8.W))) // resp to load_s2

    // val lqIdx = Output(UInt(LoadQueueIdxWidth.W))
    val sqIdx = Output(new SqPtr)

    // dataInvalid suggests store to load forward found forward should happen,
    // but data is not available for now. If dataInvalid, load inst should
    // be replayed from RS. Feedback type should be RSFeedbackType.dataInvalid
    val dataInvalid = Input(Bool()) // Addr match, but data is not valid for now

    // matchInvalid suggests in store to load forward logic, paddr cam result does
    // to equal to vaddr cam result. If matchInvalid, a microarchitectural exception
    // should be raised to flush SQ and committed sbuffer.
    val matchInvalid = Input(Bool()) // resp to load_s2

    // addrInvalid suggests store to load forward found forward should happen,
    // but address (SSID) is not available for now. If addrInvalid, load inst should
    // be replayed from RS. Feedback type should be RSFeedbackType.addrInvalid
    val addrInvalid = Input(Bool())
  }

  // LoadForwardQueryIO used in load pipeline
  //
  // Difference between PipeLoadForwardQueryIO and LoadForwardQueryIO:
  // PipeIO use predecoded sqIdxMask for better forward timing
  class PipeLoadForwardQueryIO(implicit p: Parameters) extends LoadForwardQueryIO {
    // val sqIdx = Output(new SqPtr) // for debug, should not be used in pipeline for timing reasons
    // sqIdxMask is calcuated in earlier stage for better timing
    val sqIdxMask = Output(UInt(StoreQueueSize.W))

    // dataInvalid: addr match, but data is not valid for now
    val dataInvalidFast = Input(Bool()) // resp to load_s1
    // val dataInvalid = Input(Bool()) // resp to load_s2
    val dataInvalidSqIdx = Input(new SqPtr) // resp to load_s2, sqIdx
    val addrInvalidSqIdx = Input(new SqPtr) // resp to load_s2, sqIdx
  }

  // Query load queue for ld-ld violation
  //
  // Req should be send in load_s1
  // Resp will be generated 1 cycle later
  //
  // Note that query req may be !ready, as dcache is releasing a block
  // If it happens, a replay from rs is needed.
  class LoadNukeQueryReq(implicit p: Parameters) extends XSBundle { // provide lqIdx
    val uop = new DynInst
    // mask: load's data mask.
    val mask = UInt((VLEN/8).W)

    // paddr: load's paddr.
    val paddr      = UInt(PAddrBits.W)
    // dataInvalid: load data is invalid.
    val data_valid = Bool()
    // nc: is NC access
    val is_nc = Bool()
  }

  class LoadNukeQueryResp(implicit p: Parameters) extends XSBundle {
    // rep_frm_fetch: ld-ld violation check success, replay from fetch.
    val rep_frm_fetch = Bool()
  }

  class LoadNukeQueryIO(implicit p: Parameters) extends XSBundle {
    val req    = Decoupled(new LoadNukeQueryReq)
    val resp   = Flipped(Valid(new LoadNukeQueryResp))
    val revoke = Output(Bool())
  }

  class StoreNukeQueryIO(implicit p: Parameters) extends XSBundle {
    //  robIdx: Requestor's (a store instruction) rob index for match logic.
    val robIdx = new RobPtr

    //  paddr: requestor's (a store instruction) physical address for match logic.
    val paddr  = UInt(PAddrBits.W)

    //  mask: requestor's (a store instruction) data width mask for match logic.
    val mask = UInt((VLEN/8).W)

    // matchLine: if store is vector 128-bits, load unit need to compare 128-bits vaddr.
    val matchLine = Bool()
  }

  class StoreMaBufToSqControlIO(implicit p: Parameters) extends XSBundle {
    // from storeMisalignBuffer to storeQueue, control it's sbuffer write
    val toStoreQueue = Output(new XSBundle {
      // This entry is a cross page
      val crossPageWithHit = Bool()
      val crossPageCanDeq  = Bool()
      // High page Paddr
      val paddr = UInt(PAddrBits.W)

      val withSameUop = Bool()
    })
    // from storeQueue to storeMisalignBuffer, provide detail info of this store
    val toStoreMisalignBuffer = Input(new XSBundle {
      val sqPtr = new SqPtr
      val doDeq = Bool()

      val uop = new DynInst()
    })
  }

  class StoreMaBufToVecStoreMergeBufferIO(implicit p: Parameters)  extends VLSUBundle{
    val mbIndex = Output(UInt(vsmBindexBits.W))
    val flush   = Output(Bool())
  }

  // Store byte valid mask write bundle
  //
  // Store byte valid mask write to SQ takes 2 cycles
  class StoreMaskBundle(implicit p: Parameters) extends XSBundle {
    val sqIdx = new SqPtr
    val mask = UInt((VLEN/8).W)
  }

  class LoadDataFromDcacheBundle(implicit p: Parameters) extends DCacheBundle {
    // old dcache: optimize data sram read fanout
    // val bankedDcacheData = Vec(DCacheBanks, UInt(64.W))
    // val bank_oh = UInt(DCacheBanks.W)

    // new dcache
    val respDcacheData = UInt(VLEN.W)
    val forwardMask = Vec(VLEN/8, Bool())
    val forwardData = Vec(VLEN/8, UInt(8.W))
    val uop = new DynInst // for data selection, only fwen and fuOpType are used
    val addrOffset = UInt(4.W) // for data selection

    // forward tilelink D channel
    val forward_D = Bool()
    val forwardData_D = Vec(VLEN/8, UInt(8.W))

    // forward mshr data
    val forward_mshr = Bool()
    val forwardData_mshr = Vec(VLEN/8, UInt(8.W))

    val forward_result_valid = Bool()

    def mergeTLData(): UInt = {
      // merge TL D or MSHR data at load s2
      val dcache_data = respDcacheData
      val use_D = forward_D && forward_result_valid
      val use_mshr = forward_mshr && forward_result_valid
      Mux(
        use_D || use_mshr,
        Mux(
          use_D,
          forwardData_D.asUInt,
          forwardData_mshr.asUInt
        ),
        dcache_data
      )
    }

    def mergeLsqFwdData(dcacheData: UInt): UInt = {
      // merge dcache and lsq forward data at load s3
      val rdataVec = VecInit((0 until VLEN / 8).map(j =>
        Mux(forwardMask(j), forwardData(j), dcacheData(8*(j+1)-1, 8*j))
      ))
      rdataVec.asUInt
    }
  }

  // Load writeback data from load queue (refill)
  class LoadDataFromLQBundle(implicit p: Parameters) extends XSBundle {
    val lqData = UInt(64.W) // load queue has merged data
    val uop = new DynInst // for data selection, only fwen and fuOpType are used
    val addrOffset = UInt(3.W) // for data selection

    def mergedData(): UInt = {
      lqData
    }
  }

  // Bundle for load / store wait waking up
  class MemWaitUpdateReq(implicit p: Parameters) extends XSBundle {
    val robIdx = Vec(backendParams.StaExuCnt, ValidIO(new RobPtr))
    val sqIdx = Vec(backendParams.StdCnt, ValidIO(new SqPtr))
  }

}