1/*************************************************************************************** 2* Copyright (c) 2020-2021 Institute of Computing Technology, Chinese Academy of Sciences 3* 4* XiangShan is licensed under Mulan PSL v2. 5* You can use this software according to the terms and conditions of the Mulan PSL v2. 6* You may obtain a copy of Mulan PSL v2 at: 7* http://license.coscl.org.cn/MulanPSL2 8* 9* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, 10* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, 11* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE. 12* 13* See the Mulan PSL v2 for more details. 14***************************************************************************************/ 15 16package xiangshan.backend.decode.isa.predecode 17 18import chisel3.util._ 19import xiangshan.frontend.BrType 20 21object PreDecodeInst { 22 // def C_JAL = BitPat("b????????????????_?01_?_??_???_??_???_01") // RV32C 23 def C_J = BitPat("b????????????????_101_?_??_???_??_???_01") 24 def C_JALR = BitPat("b????????????????_100_?_??_???_00_000_10") //c.jalr & c.jr 25 def C_BRANCH = BitPat("b????????????????_11?_?_??_???_??_???_01") 26 def JAL = BitPat("b????????????????_???_?????_1101111") 27 def JALR = BitPat("b????????????????_000_?????_1100111") 28 def BRANCH = BitPat("b????????????????_???_?????_1100011") 29 30 31 val brTable = Array( 32 // C_JAL -> List(BrType.jal), 33 C_J -> List(BrType.jal), 34 C_JALR -> List(BrType.jalr), 35 C_BRANCH -> List(BrType.branch), 36 JAL -> List(BrType.jal), 37 JALR -> List(BrType.jalr), 38 BRANCH -> List(BrType.branch) 39 ) 40} 41