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 30 // shorter path for s1 pred 31 val all_fast_pred = components.filter(_.is_fast_pred) 32 require(all_fast_pred.length <= 1) 33 if (all_fast_pred.length == 1) { 34 val fast_pred = all_fast_pred(0) 35 println("[composer] bypassing output of fast pred: " + fast_pred.name) 36 io.out.s1 := fast_pred.io.out.s1 37 } 38 39 var metas = 0.U(1.W) 40 var meta_sz = 0 41 for (c <- components) { 42 c.io.reset_vector := io.reset_vector 43 c.io.in.valid := io.in.valid 44 c.io.in.bits.s0_pc := io.in.bits.s0_pc 45 c.io.in.bits.folded_hist := io.in.bits.folded_hist 46 c.io.in.bits.ghist := io.in.bits.ghist 47 48 c.io.s0_fire := io.s0_fire 49 c.io.s1_fire := io.s1_fire 50 c.io.s2_fire := io.s2_fire 51 c.io.s3_fire := io.s3_fire 52 53 c.io.s2_redirect := io.s2_redirect 54 c.io.s3_redirect := io.s3_redirect 55 56 c.io.redirect := io.redirect 57 c.io.ctrl := DelayN(io.ctrl, 1) 58 59 if (c.meta_size > 0) { 60 metas = (metas << c.meta_size) | c.io.out.last_stage_meta(c.meta_size-1,0) 61 } 62 meta_sz = meta_sz + c.meta_size 63 } 64 println(s"total meta size: $meta_sz\n\n") 65 66 67 io.in.ready := components.map(_.io.s1_ready).reduce(_ && _) 68 69 io.s1_ready := components.map(_.io.s1_ready).reduce(_ && _) 70 io.s2_ready := components.map(_.io.s2_ready).reduce(_ && _) 71 72 require(meta_sz < MaxMetaLength) 73 io.out.last_stage_meta := metas 74 75 var update_meta = io.update.bits.meta 76 for (c <- components.reverse) { 77 c.io.update := io.update 78 c.io.update.bits.meta := update_meta 79 update_meta = update_meta >> c.meta_size 80 } 81 82 def extractMeta(meta: UInt, idx: Int): UInt = { 83 var update_meta = meta 84 var metas: Seq[UInt] = Nil 85 for (c <- components.reverse) { 86 metas = metas :+ update_meta 87 update_meta = update_meta >> c.meta_size 88 } 89 metas(idx) 90 } 91 92 override def getFoldedHistoryInfo = Some(components.map(_.getFoldedHistoryInfo.getOrElse(Set())).reduce(_++_)) 93 94 override val perfEvents = components.map(_.getPerfEvents).reduce(_++_) 95 generatePerfEvent() 96} 97