xref: /XiangShan/src/main/scala/xiangshan/frontend/Composer.scala (revision ba246ba174197d0fcafebeadce5e992175ade3a4) 
1/***************************************************************************************
2* Copyright (c) 2020-2021 Institute of Computing Technology, Chinese Academy of Sciences
3* Copyright (c) 2020-2021 Peng Cheng Laboratory
4*
5* XiangShan is licensed under Mulan PSL v2.
6* You can use this software according to the terms and conditions of the Mulan PSL v2.
7* You may obtain a copy of Mulan PSL v2 at:
8*          http://license.coscl.org.cn/MulanPSL2
9*
10* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
11* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
12* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
13*
14* See the Mulan PSL v2 for more details.
15***************************************************************************************/
16
17package xiangshan.frontend
18
19import chipsalliance.rocketchip.config.Parameters
20import chisel3._
21import chisel3.util._
22import chisel3.experimental.chiselName
23import xiangshan._
24import utils._
25
26@chiselName
27class Composer(implicit p: Parameters) extends BasePredictor with HasBPUConst with HasPerfEvents {
28  val (components, resp) = getBPDComponents(io.in.bits.resp_in(0), p)
29  io.out.resp := resp
30
31  var metas = 0.U(1.W)
32  var meta_sz = 0
33  for (c <- components) {
34    c.io.in.valid            := io.in.valid
35    c.io.in.bits.s0_pc       := io.in.bits.s0_pc
36    c.io.in.bits.folded_hist := io.in.bits.folded_hist
37    c.io.in.bits.ghist       := io.in.bits.ghist
38
39    c.io.s0_fire := io.s0_fire
40    c.io.s1_fire := io.s1_fire
41    c.io.s2_fire := io.s2_fire
42    c.io.s3_fire := io.s3_fire
43
44    c.io.redirect := io.redirect
45
46    if (c.meta_size > 0) {
47      metas = (metas << c.meta_size) | c.io.out.last_stage_meta(c.meta_size-1,0)
48    }
49    meta_sz = meta_sz + c.meta_size
50  }
51  println(s"total meta size: $meta_sz\n\n")
52
53  io.in.ready := components.map(_.io.s1_ready).reduce(_ && _)
54
55  io.s1_ready := components.map(_.io.s1_ready).reduce(_ && _)
56  io.s2_ready := components.map(_.io.s2_ready).reduce(_ && _)
57
58  require(meta_sz < MaxMetaLength)
59  io.out.last_stage_meta := metas
60
61  var update_meta = io.update.bits.meta
62  for (c <- components.reverse) {
63    c.io.update := io.update
64    c.io.update.bits.meta := update_meta
65    update_meta = update_meta >> c.meta_size
66  }
67
68  def extractMeta(meta: UInt, idx: Int): UInt = {
69    var update_meta = meta
70    var metas: Seq[UInt] = Nil
71    for (c <- components.reverse) {
72      metas = metas :+ update_meta
73      update_meta = update_meta >> c.meta_size
74    }
75    metas(idx)
76  }
77
78  override def getFoldedHistoryInfo = Some(components.map(_.getFoldedHistoryInfo.getOrElse(Set())).reduce(_++_))
79
80  override val perfEvents = components.map(_.getPerfEvents).reduce(_++_)
81  generatePerfEvent()
82}
83