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 org.chipsalliance.cde.config.Parameters 20import chisel3._ 21import chisel3.util._ 22import xiangshan._ 23import utils._ 24import utility._ 25 26class Composer(implicit p: Parameters) extends BasePredictor with HasBPUConst with HasPerfEvents { 27 val (components, resp) = getBPDComponents(io.in.bits.resp_in(0), p) 28 io.out := resp 29 // shorter path for s1 pred 30 val all_fast_pred = components.filter(_.is_fast_pred) 31 require(all_fast_pred.length <= 1) 32 if (all_fast_pred.length == 1) { 33 val fast_pred = all_fast_pred(0) 34 println("[composer] bypassing output of fast pred: " + fast_pred.name) 35 io.out.s1 := fast_pred.io.out.s1 36 } 37 38 var metas = 0.U(1.W) 39 var meta_sz = 0 40 for (c <- components) { 41 c.io.reset_vector := io.reset_vector 42 c.io.in.valid := io.in.valid 43 c.io.in.bits.s0_pc := io.in.bits.s0_pc 44 c.io.in.bits.folded_hist := io.in.bits.folded_hist 45 c.io.in.bits.ghist := io.in.bits.ghist 46 47 c.io.s0_fire := io.s0_fire 48 c.io.s1_fire := io.s1_fire 49 c.io.s2_fire := io.s2_fire 50 c.io.s3_fire := io.s3_fire 51 52 c.io.s2_redirect := io.s2_redirect 53 c.io.s3_redirect := io.s3_redirect 54 55 c.io.redirect := io.redirect 56 c.io.ctrl := DelayN(io.ctrl, 1) 57 58 if (c.meta_size > 0) { 59 metas = (metas << c.meta_size) | c.io.out.last_stage_meta(c.meta_size-1,0) 60 } 61 meta_sz = meta_sz + c.meta_size 62 } 63 println(s"total meta size: $meta_sz\n\n") 64 65 66 io.in.ready := components.map(_.io.s1_ready).reduce(_ && _) 67 68 io.s1_ready := components.map(_.io.s1_ready).reduce(_ && _) 69 io.s2_ready := components.map(_.io.s2_ready).reduce(_ && _) 70 71 require(meta_sz < MaxMetaLength) 72 io.out.last_stage_meta := metas 73 74 var update_meta = io.update.bits.meta 75 for (c <- components.reverse) { 76 c.io.update := io.update 77 c.io.update.bits.meta := update_meta 78 update_meta = update_meta >> c.meta_size 79 } 80 81 def extractMeta(meta: UInt, idx: Int): UInt = { 82 var update_meta = meta 83 var metas: Seq[UInt] = Nil 84 for (c <- components.reverse) { 85 metas = metas :+ update_meta 86 update_meta = update_meta >> c.meta_size 87 } 88 metas(idx) 89 } 90 91 override def getFoldedHistoryInfo = Some(components.map(_.getFoldedHistoryInfo.getOrElse(Set())).reduce(_++_)) 92 93 override val perfEvents = components.map(_.getPerfEvents).reduce(_++_) 94 generatePerfEvent() 95} 96