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 chisel3._ 20import org.chipsalliance.cde.config.Parameters 21import utility._ 22 23class Composer(implicit p: Parameters) extends BasePredictor with HasBPUConst with HasPerfEvents { 24 val (components, resp) = getBPDComponents(io.in.bits.resp_in(0), p) 25 io.out := resp 26 // shorter path for s1 pred 27 val all_fast_pred = components.filter(_.is_fast_pred) 28 require(all_fast_pred.length <= 1) 29 if (all_fast_pred.length == 1) { 30 val fast_pred = all_fast_pred(0) 31 println("[composer] bypassing output of fast pred: " + fast_pred.name) 32 io.out.s1 := fast_pred.io.out.s1 33 } 34 35 var metas = 0.U(1.W) 36 var meta_sz = 0 37 for (c <- components) { 38 c.io.reset_vector := io.reset_vector 39 c.io.in.valid := io.in.valid 40 c.io.in.bits.s0_pc := io.in.bits.s0_pc 41 c.io.in.bits.folded_hist := io.in.bits.folded_hist 42 c.io.in.bits.s1_folded_hist := io.in.bits.s1_folded_hist 43 c.io.in.bits.ghist := io.in.bits.ghist 44 45 c.io.s0_fire := io.s0_fire 46 c.io.s1_fire := io.s1_fire 47 c.io.s2_fire := io.s2_fire 48 c.io.s3_fire := io.s3_fire 49 50 c.io.s2_redirect := io.s2_redirect 51 c.io.s3_redirect := io.s3_redirect 52 53 c.io.redirect := io.redirect 54 c.io.ctrl := DelayN(io.ctrl, 1) 55 c.io.redirectFromIFU := io.redirectFromIFU 56 57 if (c.meta_size > 0) { 58 metas = (metas << c.meta_size) | c.io.out.last_stage_meta(c.meta_size - 1, 0) 59 } 60 meta_sz = meta_sz + c.meta_size 61 } 62 println(s"total meta size: $meta_sz\n\n") 63 64 io.in.ready := components.map(_.io.s1_ready).reduce(_ && _) 65 66 io.s1_ready := components.map(_.io.s1_ready).reduce(_ && _) 67 io.s2_ready := components.map(_.io.s2_ready).reduce(_ && _) 68 69 require(meta_sz <= MaxMetaLength) 70 io.out.last_stage_meta := metas 71 72 var update_meta = io.update.bits.meta 73 for (c <- components.reverse) { 74 c.io.update := io.update 75 c.io.update.bits.meta := update_meta 76 update_meta = update_meta >> c.meta_size 77 } 78 79 def extractMeta(meta: UInt, idx: Int): UInt = { 80 var update_meta = meta 81 var metas: Seq[UInt] = Nil 82 for (c <- components.reverse) { 83 metas = metas :+ update_meta 84 update_meta = update_meta >> c.meta_size 85 } 86 metas(idx) 87 } 88 89 override def getFoldedHistoryInfo = Some(components.map(_.getFoldedHistoryInfo.getOrElse(Set())).reduce(_ ++ _)) 90 91 override val perfEvents = components.map(_.getPerfEvents).reduce(_ ++ _) 92 generatePerfEvent() 93} 94