xref: /XiangShan/src/main/scala/xiangshan/frontend/Composer.scala (revision 57bb43b5f11c3f1e89ac52f232fe73056b35d9bd) 
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.s2_redirect := io.s2_redirect
45    c.io.s3_redirect := io.s3_redirect
46
47    c.io.redirect := io.redirect
48    c.io.ctrl := DelayN(io.ctrl, 1)
49
50    if (c.meta_size > 0) {
51      metas = (metas << c.meta_size) | c.io.out.last_stage_meta(c.meta_size-1,0)
52    }
53    meta_sz = meta_sz + c.meta_size
54  }
55  println(s"total meta size: $meta_sz\n\n")
56
57  io.in.ready := components.map(_.io.s1_ready).reduce(_ && _)
58
59  io.s1_ready := components.map(_.io.s1_ready).reduce(_ && _)
60  io.s2_ready := components.map(_.io.s2_ready).reduce(_ && _)
61
62  require(meta_sz < MaxMetaLength)
63  io.out.last_stage_meta := metas
64
65  var update_meta = io.update.bits.meta
66  for (c <- components.reverse) {
67    c.io.update := io.update
68    c.io.update.bits.meta := update_meta
69    update_meta = update_meta >> c.meta_size
70  }
71
72  def extractMeta(meta: UInt, idx: Int): UInt = {
73    var update_meta = meta
74    var metas: Seq[UInt] = Nil
75    for (c <- components.reverse) {
76      metas = metas :+ update_meta
77      update_meta = update_meta >> c.meta_size
78    }
79    metas(idx)
80  }
81
82  override def getFoldedHistoryInfo = Some(components.map(_.getFoldedHistoryInfo.getOrElse(Set())).reduce(_++_))
83
84  override val perfEvents = components.map(_.getPerfEvents).reduce(_++_)
85  generatePerfEvent()
86}
87