1246 lines
57 KiB
Systemverilog
1246 lines
57 KiB
Systemverilog
//********************************************************************************
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// SPDX-License-Identifier: Apache-2.0
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// Copyright 2019 Western Digital Corporation or its affiliates.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//********************************************************************************
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//********************************************************************************
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// Function: Instruction aligner
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//********************************************************************************
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module ifu_aln_ctl
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import swerv_types::*;
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(
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input logic active_clk,
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input logic iccm_rd_ecc_single_err, // This fetch has a single ICCM ecc error.
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input logic iccm_rd_ecc_double_err, // This fetch has a double ICCM ecc error.
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input logic ic_rd_parity_final_err, // for tag parity errors
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input logic ifu_icache_fetch_f2,
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input logic ic_access_fault_f2, // Instruction access fault for the current fetch.
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input logic [`RV_BHT_GHR_RANGE] ifu_bp_fghr_f2, // fetch GHR
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input logic [31:1] ifu_bp_btb_target_f2, // predicted RET target
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input logic [11:0] ifu_bp_poffset_f2, // predicted target offset
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input logic [7:0] ifu_bp_hist0_f2, // history counters for all 4 potential branches, bit 1, right justified
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input logic [7:0] ifu_bp_hist1_f2, // history counters for all 4 potential branches, bit 1, right justified
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input logic [7:0] ifu_bp_pc4_f2, // pc4 indication, right justified
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`ifdef RV_BTB_48
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input logic [7:0][1:0] ifu_bp_way_f2, // way indication, right justified
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`else
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input logic [7:0] ifu_bp_way_f2, // way indication, right justified
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`endif
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input logic [7:0] ifu_bp_valid_f2, // branch valid, right justified
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input logic [7:0] ifu_bp_ret_f2, // predicted ret indication, right justified
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input logic exu_flush_final, // Flush from the pipeline.
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input logic dec_ib3_valid_d, // valids for top 2 instruction buffers at decode
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input logic dec_ib2_valid_d,
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input logic dec_ib0_valid_eff_d, // effective valid taking decode into account
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input logic dec_ib1_valid_eff_d,
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input logic [127:0] ifu_fetch_data, // fetch data in memory format - not right justified
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input icache_err_pkt_t ic_error_f2, // based on configuration: either parity or ecc
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input logic [7:0] ifu_fetch_val, // valids on a 2B boundary, right justified
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input logic [31:1] ifu_fetch_pc, // starting pc of fetch
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input logic rst_l,
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input logic clk,
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input logic dec_tlu_core_ecc_disable, // disable ecc checking and flagging
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output logic ifu_i0_valid, // Instruction 0 is valid
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output logic ifu_i1_valid, // Instruction 1 is valid
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output logic ifu_i0_icaf, // Instruction 0 has access fault
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output logic ifu_i1_icaf, // Instruction 1 has access fault
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output logic ifu_i0_icaf_f1, // Instruction 0 has access fault on second fetch group
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output logic ifu_i1_icaf_f1, // Instruction 1 has access fault on second fetch group
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output logic ifu_i0_perr, // Instruction 0 has parity error
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output logic ifu_i1_perr, // Instruction 1 has parity error
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output logic ifu_i0_sbecc, // Instruction 0 has single bit ecc error
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output logic ifu_i1_sbecc, // Instruction 1 has single bit ecc error
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output logic ifu_i0_dbecc, // Instruction 0 has double bit ecc error
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output logic ifu_i1_dbecc, // Instruction 1 has double bit ecc error
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output logic [31:0] ifu_i0_instr, // Instruction 0
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output logic [31:0] ifu_i1_instr, // Instruction 1
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output logic [31:1] ifu_i0_pc, // Instruction 0 PC
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output logic [31:1] ifu_i1_pc, // Instruction 1 PC
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output logic ifu_i0_pc4,
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output logic ifu_i1_pc4,
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output logic ifu_fb_consume1, // Consumed one buffer. To fetch control fetch for buffer mass balance
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output logic ifu_fb_consume2, // Consumed two buffers.To fetch control fetch for buffer mass balance
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output logic [15:0] ifu_illegal_inst, // Illegal Instruction.
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output br_pkt_t i0_brp, // Branch packet for I0.
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output br_pkt_t i1_brp, // Branch packet for I1.
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output logic [1:0] ifu_pmu_instr_aligned, // number of inst aligned this cycle
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output logic ifu_pmu_align_stall, // aligner stalled this cycle
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output logic [16:2] ifu_icache_error_index, // Icache Error address index
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output logic ifu_icache_error_val, // Icache error valid
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output logic ifu_icache_sb_error_val,
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output logic [15:0] ifu_i0_cinst, // 16b compress inst for i0
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output logic [15:0] ifu_i1_cinst, // 16b compress inst for i1
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input logic scan_mode
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);
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`include "global.h"
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logic ifvalid;
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logic shift_f1_f0, shift_f2_f0, shift_f2_f1;
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logic fetch_to_f0, fetch_to_f1, fetch_to_f2;
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logic [7:0] f2val_in, f2val;
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logic [7:0] f1val_in, f1val;
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logic [7:0] f0val_in, f0val;
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logic [7:0] sf1val, sf0val;
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logic [31:1] f2pc_in, f2pc;
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logic [31:1] f1pc_in, f1pc;
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logic [31:1] f0pc_in, f0pc;
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logic [31:1] sf1pc, sf0pc;
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logic [63:0] aligndata;
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logic first4B, first2B;
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logic second4B, second2B;
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logic third4B, third2B;
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logic [31:0] uncompress0, uncompress1, uncompress2;
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logic ibuffer_room1_more;
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logic ibuffer_room2_more;
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logic i0_shift, i1_shift;
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logic shift_2B, shift_4B, shift_6B, shift_8B;
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logic f1_shift_2B, f1_shift_4B, f1_shift_6B;
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logic f2_valid, sf1_valid, sf0_valid;
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logic [31:0] ifirst, isecond, ithird;
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logic [31:1] f0pc_plus1, f0pc_plus2, f0pc_plus3, f0pc_plus4;
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logic [31:1] f1pc_plus1, f1pc_plus2, f1pc_plus3;
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logic [3:0] alignval;
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logic [31:1] firstpc, secondpc, thirdpc, fourthpc;
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logic [11:0] f1poffset;
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logic [11:0] f0poffset;
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logic [`RV_BHT_GHR_RANGE] f1fghr;
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logic [`RV_BHT_GHR_RANGE] f0fghr;
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logic [7:0] f1hist1;
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logic [7:0] f0hist1;
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logic [7:0] f1hist0;
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logic [7:0] f0hist0;
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logic [7:0] f1pc4;
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logic [7:0] f0pc4;
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logic [7:0] f1ret;
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logic [7:0] f0ret;
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`ifdef RV_BTB_48
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logic [7:0][1:0] f1way;
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logic [7:0][1:0] f0way;
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`else
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logic [7:0] f1way;
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logic [7:0] f0way;
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`endif
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logic [7:0] f1brend;
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logic [7:0] f0brend;
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logic [3:0] alignbrend;
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logic [3:0] alignpc4;
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`ifdef RV_ICACHE_ECC
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logic [19:0] alignecc;
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`else
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logic [3:0] alignparity;
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`endif
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logic [3:0] alignret;
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logic [3:0] alignway;
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logic [3:0] alignhist1;
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logic [3:0] alignhist0;
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logic [3:1] alignfromf1;
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logic i0_ends_f1, i1_ends_f1;
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logic i0_br_start_error, i1_br_start_error;
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logic [31:1] f1prett;
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logic [31:1] f0prett;
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logic f1dbecc;
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logic f0dbecc;
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logic f1sbecc;
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logic f0sbecc;
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logic f1perr;
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logic f0perr;
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logic f1icfetch;
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logic f0icfetch;
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logic f1icaf;
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logic f0icaf;
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logic [3:0] alignicfetch;
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logic [3:0] aligntagperr;
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logic [3:0] aligndataperr;
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logic [3:0] alignsbecc;
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logic [3:0] aligndbecc;
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logic [3:0] alignicaf;
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logic i0_brp_pc4, i1_brp_pc4;
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logic [`RV_BTB_ADDR_HI:`RV_BTB_ADDR_LO] firstpc_hash, secondpc_hash, thirdpc_hash, fourthpc_hash;
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logic i0_illegal, i1_illegal;
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logic shift_illegal;
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logic first_legal, second_legal, third_legal;
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logic [15:0] illegal_inst;
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logic illegal_inst_en;
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logic illegal_lockout_in, illegal_lockout;
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logic [3:0] alignfinalperr;
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logic f2_wr_en;
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assign f2_wr_en = fetch_to_f2;
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logic f0_shift_wr_en;
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assign f0_shift_wr_en = (fetch_to_f0 | shift_f2_f0 | shift_f1_f0 | shift_2B | shift_4B | shift_6B | shift_8B);
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logic f1_shift_wr_en;
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assign f1_shift_wr_en = (fetch_to_f1 | shift_f2_f1 | f1_shift_2B | f1_shift_4B | f1_shift_6B);
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logic [1:0] wrptr, wrptr_in;
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logic [1:0] rdptr, rdptr_in;
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logic [2:0] qwen;
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logic [127:0] q2,q1,q0;
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logic [2:0] first_offset, second_offset;
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logic [2:0] q2off_eff, q2off_in, q2off;
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logic [2:0] q1off_eff, q1off_in, q1off;
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logic [2:0] q0off_eff, q0off_in, q0off;
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logic f0_shift_2B, f0_shift_4B, f0_shift_6B, f0_shift_8B;
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logic [127:0] q0eff;
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logic [127:0] q0final;
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logic [2:0] q0ptr;
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logic [7:0] q0sel;
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logic [127:0] q1eff;
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logic [127:0] q1final;
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logic [2:0] q1ptr;
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logic [7:0] q1sel;
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logic [2:0] qren;
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logic consume_fb1, consume_fb0;
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logic [3:1] icaf_eff;
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`ifdef RV_ICACHE_ECC
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logic [39:0] q0ecc, q1ecc, q2ecc;
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logic [39:0] q0ecceff, q1ecceff;
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logic [39:0] q0eccfinal, q1eccfinal;
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`else
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logic [7:0] q0parity, q1parity, q2parity;
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logic [7:0] q0parityeff, q1parityeff;
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logic [7:0] q0parityfinal, q1parityfinal;
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`endif
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// new queue control logic
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assign wrptr_in[1:0] = (({2{wrptr[1:0]==2'b00 & ifvalid}} & 2'b01) |
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({2{wrptr[1:0]==2'b01 & ifvalid}} & 2'b10) |
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({2{wrptr[1:0]==2'b10 & ifvalid}} & 2'b00) |
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({2{~ifvalid}} & wrptr[1:0])) & ~{2{exu_flush_final}};
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rvdff #(2) wrpff (.*, .clk(active_clk), .din(wrptr_in[1:0]), .dout(wrptr[1:0]));
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assign rdptr_in[1:0] = (({2{rdptr[1:0]==2'b00 & ifu_fb_consume1}} & 2'b01) |
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({2{rdptr[1:0]==2'b01 & ifu_fb_consume1}} & 2'b10) |
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({2{rdptr[1:0]==2'b10 & ifu_fb_consume1}} & 2'b00) |
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({2{rdptr[1:0]==2'b00 & ifu_fb_consume2}} & 2'b10) |
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({2{rdptr[1:0]==2'b01 & ifu_fb_consume2}} & 2'b00) |
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({2{rdptr[1:0]==2'b10 & ifu_fb_consume2}} & 2'b01) |
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({2{~ifu_fb_consume1&~ifu_fb_consume2}} & rdptr[1:0])) & ~{2{exu_flush_final}};
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rvdff #(2) rdpff (.*, .clk(active_clk), .din(rdptr_in[1:0]), .dout(rdptr[1:0]));
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assign qren[2:0] = { rdptr[1:0]==2'b10,
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rdptr[1:0]==2'b01,
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rdptr[1:0]==2'b00
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};
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assign qwen[2:0] = { wrptr[1:0]==2'b10 & ifvalid,
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wrptr[1:0]==2'b01 & ifvalid,
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wrptr[1:0]==2'b00 & ifvalid
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};
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assign first_offset[2:0] = {f0_shift_8B, f0_shift_6B|f0_shift_4B, f0_shift_6B|f0_shift_2B };
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assign second_offset[2:0] = {1'b0, f1_shift_6B|f1_shift_4B, f1_shift_6B|f1_shift_2B };
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assign q2off_eff[2:0] = (rdptr[1:0]==2'd2) ? (q2off[2:0] + first_offset[2:0]) :
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(rdptr[1:0]==2'd1) ? (q2off[2:0] + second_offset[2:0]) :
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q2off[2:0];
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assign q2off_in[2:0] = (qwen[2]) ? ifu_fetch_pc[3:1] : q2off_eff[2:0];
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rvdff #(3) q2offsetff (.*, .clk(active_clk), .din(q2off_in[2:0]), .dout(q2off[2:0]));
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assign q1off_eff[2:0] = (rdptr[1:0]==2'd1) ? (q1off[2:0] + first_offset[2:0]) :
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(rdptr[1:0]==2'd0) ? (q1off[2:0] + second_offset[2:0]) :
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q1off[2:0];
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assign q1off_in[2:0] = (qwen[1]) ? ifu_fetch_pc[3:1] : q1off_eff[2:0];
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rvdff #(3) q1offsetff (.*, .clk(active_clk), .din(q1off_in[2:0]), .dout(q1off[2:0]));
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assign q0off_eff[2:0] = (rdptr[1:0]==2'd0) ? (q0off[2:0] + first_offset[2:0]) :
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(rdptr[1:0]==2'd2) ? (q0off[2:0] + second_offset[2:0]) :
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q0off[2:0];
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assign q0off_in[2:0] = (qwen[0]) ? ifu_fetch_pc[3:1] : q0off_eff[2:0];
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rvdff #(3) q0offsetff (.*, .clk(active_clk), .din(q0off_in[2:0]), .dout(q0off[2:0]));
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assign q0ptr[2:0] = (({3{rdptr[1:0]==2'b00}} & q0off[2:0]) |
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({3{rdptr[1:0]==2'b01}} & q1off[2:0]) |
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({3{rdptr[1:0]==2'b10}} & q2off[2:0]));
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assign q1ptr[2:0] = (({3{rdptr[1:0]==2'b00}} & q1off[2:0]) |
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({3{rdptr[1:0]==2'b01}} & q2off[2:0]) |
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({3{rdptr[1:0]==2'b10}} & q0off[2:0]));
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assign q0sel[7:0] = { q0ptr[2:0]==3'b111,
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q0ptr[2:0]==3'b110,
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q0ptr[2:0]==3'b101,
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q0ptr[2:0]==3'b100,
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q0ptr[2:0]==3'b011,
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q0ptr[2:0]==3'b010,
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q0ptr[2:0]==3'b001,
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q0ptr[2:0]==3'b000
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};
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assign q1sel[7:0] = { q1ptr[2:0]==3'b111,
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q1ptr[2:0]==3'b110,
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q1ptr[2:0]==3'b101,
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q1ptr[2:0]==3'b100,
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q1ptr[2:0]==3'b011,
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q1ptr[2:0]==3'b010,
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q1ptr[2:0]==3'b001,
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q1ptr[2:0]==3'b000
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};
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// end new queue control logic
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// misc data that is associated with each fetch buffer
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localparam MHI = 47+`RV_BHT_GHR_SIZE;
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localparam MSIZE = 48+`RV_BHT_GHR_SIZE;
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logic [MHI:0] misc_data_in, misc2, misc1, misc0;
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logic [MHI:0] misc1eff, misc0eff;
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assign misc_data_in[MHI:0] = { iccm_rd_ecc_double_err,
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iccm_rd_ecc_single_err,
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ifu_icache_fetch_f2,
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ic_rd_parity_final_err,
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ic_access_fault_f2,
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ifu_bp_btb_target_f2[31:1],
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ifu_bp_poffset_f2[11:0],
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ifu_bp_fghr_f2[`RV_BHT_GHR_RANGE]
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};
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rvdffe #(MSIZE) misc2ff (.*, .en(qwen[2]), .din(misc_data_in[MHI:0]), .dout(misc2[MHI:0]));
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rvdffe #(MSIZE) misc1ff (.*, .en(qwen[1]), .din(misc_data_in[MHI:0]), .dout(misc1[MHI:0]));
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rvdffe #(MSIZE) misc0ff (.*, .en(qwen[0]), .din(misc_data_in[MHI:0]), .dout(misc0[MHI:0]));
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assign {misc1eff[MHI:0],misc0eff[MHI:0]} = (({MSIZE*2{qren[0]}} & {misc1[MHI:0],misc0[MHI:0]}) |
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({MSIZE*2{qren[1]}} & {misc2[MHI:0],misc1[MHI:0]}) |
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({MSIZE*2{qren[2]}} & {misc0[MHI:0],misc2[MHI:0]}));
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assign { f1dbecc,
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f1sbecc,
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f1icfetch,
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f1perr,
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f1icaf,
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f1prett[31:1],
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f1poffset[11:0],
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f1fghr[`RV_BHT_GHR_RANGE]
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} = misc1eff[MHI:0];
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assign { f0dbecc,
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f0sbecc,
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f0icfetch,
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f0perr,
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|
f0icaf,
|
|
f0prett[31:1],
|
|
f0poffset[11:0],
|
|
f0fghr[`RV_BHT_GHR_RANGE]
|
|
} = misc0eff[MHI:0];
|
|
|
|
|
|
`ifdef RV_BTB_48
|
|
localparam BRDATA_SIZE=56;
|
|
localparam BRDATA_WIDTH = 7;
|
|
`else
|
|
localparam BRDATA_SIZE=48;
|
|
localparam BRDATA_WIDTH = 6;
|
|
`endif
|
|
logic [BRDATA_SIZE-1:0] brdata_in, brdata2, brdata1, brdata0;
|
|
logic [BRDATA_SIZE-1:0] brdata1eff, brdata0eff;
|
|
logic [BRDATA_SIZE-1:0] brdata1final, brdata0final;
|
|
assign brdata_in[BRDATA_SIZE-1:0] = {
|
|
ifu_bp_hist1_f2[7],ifu_bp_hist0_f2[7],ifu_bp_pc4_f2[7],ifu_bp_way_f2[7],ifu_bp_valid_f2[7],ifu_bp_ret_f2[7],
|
|
ifu_bp_hist1_f2[6],ifu_bp_hist0_f2[6],ifu_bp_pc4_f2[6],ifu_bp_way_f2[6],ifu_bp_valid_f2[6],ifu_bp_ret_f2[6],
|
|
ifu_bp_hist1_f2[5],ifu_bp_hist0_f2[5],ifu_bp_pc4_f2[5],ifu_bp_way_f2[5],ifu_bp_valid_f2[5],ifu_bp_ret_f2[5],
|
|
ifu_bp_hist1_f2[4],ifu_bp_hist0_f2[4],ifu_bp_pc4_f2[4],ifu_bp_way_f2[4],ifu_bp_valid_f2[4],ifu_bp_ret_f2[4],
|
|
ifu_bp_hist1_f2[3],ifu_bp_hist0_f2[3],ifu_bp_pc4_f2[3],ifu_bp_way_f2[3],ifu_bp_valid_f2[3],ifu_bp_ret_f2[3],
|
|
ifu_bp_hist1_f2[2],ifu_bp_hist0_f2[2],ifu_bp_pc4_f2[2],ifu_bp_way_f2[2],ifu_bp_valid_f2[2],ifu_bp_ret_f2[2],
|
|
ifu_bp_hist1_f2[1],ifu_bp_hist0_f2[1],ifu_bp_pc4_f2[1],ifu_bp_way_f2[1],ifu_bp_valid_f2[1],ifu_bp_ret_f2[1],
|
|
ifu_bp_hist1_f2[0],ifu_bp_hist0_f2[0],ifu_bp_pc4_f2[0],ifu_bp_way_f2[0],ifu_bp_valid_f2[0],ifu_bp_ret_f2[0]
|
|
};
|
|
//
|
|
rvdffe #(BRDATA_SIZE) brdata2ff (.*, .en(qwen[2]), .din(brdata_in[BRDATA_SIZE-1:0]), .dout(brdata2[BRDATA_SIZE-1:0]));
|
|
rvdffe #(BRDATA_SIZE) brdata1ff (.*, .en(qwen[1]), .din(brdata_in[BRDATA_SIZE-1:0]), .dout(brdata1[BRDATA_SIZE-1:0]));
|
|
rvdffe #(BRDATA_SIZE) brdata0ff (.*, .en(qwen[0]), .din(brdata_in[BRDATA_SIZE-1:0]), .dout(brdata0[BRDATA_SIZE-1:0]));
|
|
|
|
|
|
assign {brdata1eff[BRDATA_SIZE-1:0],brdata0eff[BRDATA_SIZE-1:0]} = (({BRDATA_SIZE*2{qren[0]}} & {brdata1[BRDATA_SIZE-1:0],brdata0[BRDATA_SIZE-1:0]}) |
|
|
({BRDATA_SIZE*2{qren[1]}} & {brdata2[BRDATA_SIZE-1:0],brdata1[BRDATA_SIZE-1:0]}) |
|
|
({BRDATA_SIZE*2{qren[2]}} & {brdata0[BRDATA_SIZE-1:0],brdata2[BRDATA_SIZE-1:0]}));
|
|
|
|
assign brdata0final[BRDATA_SIZE-1:0] = (({BRDATA_SIZE{q0sel[0]}} & { brdata0eff[8*6-1:0*6]}) |
|
|
({BRDATA_SIZE{q0sel[1]}} & {{1*BRDATA_WIDTH{1'b0}},brdata0eff[BRDATA_SIZE-1:1*BRDATA_WIDTH]}) |
|
|
({BRDATA_SIZE{q0sel[2]}} & {{2*BRDATA_WIDTH{1'b0}},brdata0eff[BRDATA_SIZE-1:2*BRDATA_WIDTH]}) |
|
|
({BRDATA_SIZE{q0sel[3]}} & {{3*BRDATA_WIDTH{1'b0}},brdata0eff[BRDATA_SIZE-1:3*BRDATA_WIDTH]}) |
|
|
({BRDATA_SIZE{q0sel[4]}} & {{4*BRDATA_WIDTH{1'b0}},brdata0eff[BRDATA_SIZE-1:4*BRDATA_WIDTH]}) |
|
|
({BRDATA_SIZE{q0sel[5]}} & {{5*BRDATA_WIDTH{1'b0}},brdata0eff[BRDATA_SIZE-1:5*BRDATA_WIDTH]}) |
|
|
({BRDATA_SIZE{q0sel[6]}} & {{6*BRDATA_WIDTH{1'b0}},brdata0eff[BRDATA_SIZE-1:6*BRDATA_WIDTH]}) |
|
|
({BRDATA_SIZE{q0sel[7]}} & {{7*BRDATA_WIDTH{1'b0}},brdata0eff[BRDATA_SIZE-1:7*BRDATA_WIDTH]}));
|
|
|
|
assign brdata1final[BRDATA_SIZE-1:0] = (({BRDATA_SIZE{q1sel[0]}} & { brdata1eff[8*6-1:0*6]}) |
|
|
({BRDATA_SIZE{q1sel[1]}} & {{1*BRDATA_WIDTH{1'b0}},brdata1eff[BRDATA_SIZE-1:1*BRDATA_WIDTH]}) |
|
|
({BRDATA_SIZE{q1sel[2]}} & {{2*BRDATA_WIDTH{1'b0}},brdata1eff[BRDATA_SIZE-1:2*BRDATA_WIDTH]}) |
|
|
({BRDATA_SIZE{q1sel[3]}} & {{3*BRDATA_WIDTH{1'b0}},brdata1eff[BRDATA_SIZE-1:3*BRDATA_WIDTH]}) |
|
|
({BRDATA_SIZE{q1sel[4]}} & {{4*BRDATA_WIDTH{1'b0}},brdata1eff[BRDATA_SIZE-1:4*BRDATA_WIDTH]}) |
|
|
({BRDATA_SIZE{q1sel[5]}} & {{5*BRDATA_WIDTH{1'b0}},brdata1eff[BRDATA_SIZE-1:5*BRDATA_WIDTH]}) |
|
|
({BRDATA_SIZE{q1sel[6]}} & {{6*BRDATA_WIDTH{1'b0}},brdata1eff[BRDATA_SIZE-1:6*BRDATA_WIDTH]}) |
|
|
({BRDATA_SIZE{q1sel[7]}} & {{7*BRDATA_WIDTH{1'b0}},brdata1eff[BRDATA_SIZE-1:7*BRDATA_WIDTH]}));
|
|
|
|
assign {
|
|
f0hist1[7],f0hist0[7],f0pc4[7],f0way[7],f0brend[7],f0ret[7],
|
|
f0hist1[6],f0hist0[6],f0pc4[6],f0way[6],f0brend[6],f0ret[6],
|
|
f0hist1[5],f0hist0[5],f0pc4[5],f0way[5],f0brend[5],f0ret[5],
|
|
f0hist1[4],f0hist0[4],f0pc4[4],f0way[4],f0brend[4],f0ret[4],
|
|
f0hist1[3],f0hist0[3],f0pc4[3],f0way[3],f0brend[3],f0ret[3],
|
|
f0hist1[2],f0hist0[2],f0pc4[2],f0way[2],f0brend[2],f0ret[2],
|
|
f0hist1[1],f0hist0[1],f0pc4[1],f0way[1],f0brend[1],f0ret[1],
|
|
f0hist1[0],f0hist0[0],f0pc4[0],f0way[0],f0brend[0],f0ret[0]
|
|
} = brdata0final[BRDATA_SIZE-1:0];
|
|
|
|
assign {
|
|
f1hist1[7],f1hist0[7],f1pc4[7],f1way[7],f1brend[7],f1ret[7],
|
|
f1hist1[6],f1hist0[6],f1pc4[6],f1way[6],f1brend[6],f1ret[6],
|
|
f1hist1[5],f1hist0[5],f1pc4[5],f1way[5],f1brend[5],f1ret[5],
|
|
f1hist1[4],f1hist0[4],f1pc4[4],f1way[4],f1brend[4],f1ret[4],
|
|
f1hist1[3],f1hist0[3],f1pc4[3],f1way[3],f1brend[3],f1ret[3],
|
|
f1hist1[2],f1hist0[2],f1pc4[2],f1way[2],f1brend[2],f1ret[2],
|
|
f1hist1[1],f1hist0[1],f1pc4[1],f1way[1],f1brend[1],f1ret[1],
|
|
f1hist1[0],f1hist0[0],f1pc4[0],f1way[0],f1brend[0],f1ret[0]
|
|
} = brdata1final[BRDATA_SIZE-1:0];
|
|
|
|
|
|
// possible states of { sf0_valid, sf1_valid, f2_valid }
|
|
|
|
// 000 if->f0
|
|
|
|
// 100 if->f1
|
|
|
|
// 101 illegal
|
|
|
|
// 010 f1->f0, if->f1
|
|
|
|
// 110 if->f2
|
|
|
|
// 001 if->f1, f2->f0
|
|
|
|
// 011 f1->f0, f2->f1, if->f2
|
|
|
|
// 111 !if, no shift
|
|
|
|
assign f2_valid = f2val[0];
|
|
|
|
assign sf1_valid = sf1val[0];
|
|
|
|
assign sf0_valid = sf0val[0];
|
|
|
|
// interface to fetch
|
|
|
|
assign consume_fb0 = ~sf0val[0] & f0val[0];
|
|
|
|
assign consume_fb1 = ~sf1val[0] & f1val[0];
|
|
|
|
assign ifu_fb_consume1 = consume_fb0 & ~consume_fb1 & ~exu_flush_final;
|
|
|
|
assign ifu_fb_consume2 = consume_fb0 & consume_fb1 & ~exu_flush_final;
|
|
|
|
assign ifvalid = ifu_fetch_val[0];
|
|
|
|
assign shift_f1_f0 = ~sf0_valid & sf1_valid;
|
|
|
|
assign shift_f2_f0 = ~sf0_valid & ~sf1_valid & f2_valid;
|
|
|
|
assign shift_f2_f1 = ~sf0_valid & sf1_valid & f2_valid;
|
|
|
|
assign fetch_to_f0 = ~sf0_valid & ~sf1_valid & ~f2_valid & ifvalid;
|
|
|
|
assign fetch_to_f1 = (~sf0_valid & ~sf1_valid & f2_valid & ifvalid) |
|
|
(~sf0_valid & sf1_valid & ~f2_valid & ifvalid) |
|
|
( sf0_valid & ~sf1_valid & ~f2_valid & ifvalid);
|
|
|
|
assign fetch_to_f2 = (~sf0_valid & sf1_valid & f2_valid & ifvalid) |
|
|
( sf0_valid & sf1_valid & ~f2_valid & ifvalid);
|
|
|
|
// f0 valid states
|
|
//
|
|
// 11111111
|
|
// 11111110
|
|
// 11111100
|
|
// 11111000
|
|
// 11110000
|
|
|
|
// 11100000
|
|
// 11000000
|
|
// 10000000
|
|
// 00000000
|
|
|
|
|
|
|
|
// make this two incrementors with some logic on the lower bits
|
|
|
|
assign f0pc_plus1[31:1] = f0pc[31:1] + 31'd1;
|
|
assign f0pc_plus2[31:1] = f0pc[31:1] + 31'd2;
|
|
assign f0pc_plus3[31:1] = f0pc[31:1] + 31'd3;
|
|
assign f0pc_plus4[31:1] = f0pc[31:1] + 31'd4;
|
|
|
|
assign f1pc_plus1[31:1] = f1pc[31:1] + 31'd1;
|
|
assign f1pc_plus2[31:1] = f1pc[31:1] + 31'd2;
|
|
assign f1pc_plus3[31:1] = f1pc[31:1] + 31'd3;
|
|
|
|
assign f2pc_in[31:1] = ifu_fetch_pc[31:1];
|
|
|
|
rvdffe #(31) f2pcff (.*, .en(f2_wr_en), .din(f2pc_in[31:1]), .dout(f2pc[31:1]));
|
|
|
|
assign sf1pc[31:1] = ({31{f1_shift_2B}} & (f1pc_plus1[31:1])) |
|
|
({31{f1_shift_4B}} & (f1pc_plus2[31:1])) |
|
|
({31{f1_shift_6B}} & (f1pc_plus3[31:1])) |
|
|
({31{~f1_shift_2B&~f1_shift_4B&~f1_shift_6B}} & f1pc[31:1]);
|
|
|
|
assign f1pc_in[31:1] = ({31{fetch_to_f1}} & ifu_fetch_pc[31:1]) |
|
|
({31{shift_f2_f1}} & f2pc[31:1]) |
|
|
({31{~fetch_to_f1&~shift_f2_f1}} & sf1pc[31:1]);
|
|
|
|
rvdffe #(31) f1pcff (.*, .en(f1_shift_wr_en), .din(f1pc_in[31:1]), .dout(f1pc[31:1]));
|
|
|
|
assign sf0pc[31:1] = ({31{shift_2B}} & (f0pc_plus1[31:1])) |
|
|
({31{shift_4B}} & (f0pc_plus2[31:1])) |
|
|
({31{shift_6B}} & (f0pc_plus3[31:1])) |
|
|
({31{shift_8B}} & (f0pc_plus4[31:1]));
|
|
|
|
assign f0pc_in[31:1] = ({31{fetch_to_f0}} & ifu_fetch_pc[31:1]) |
|
|
({31{shift_f2_f0}} & f2pc[31:1]) |
|
|
({31{shift_f1_f0}} & sf1pc[31:1]) |
|
|
({31{~fetch_to_f0&~shift_f2_f0&~shift_f1_f0}} & sf0pc[31:1]);
|
|
|
|
rvdffe #(31) f0pcff (.*, .en(f0_shift_wr_en), .din(f0pc_in[31:1]), .dout(f0pc[31:1]));
|
|
|
|
// on flush_final all valids go to 0
|
|
|
|
// no clock-gating on the valids
|
|
|
|
assign f2val_in[7:0] = (({8{fetch_to_f2}} & ifu_fetch_val[7:0]) |
|
|
({8{~fetch_to_f2&~shift_f2_f1&~shift_f2_f0}} & f2val[7:0])) & ~{8{exu_flush_final}};
|
|
|
|
rvdff #(8) f2valff (.*, .clk(active_clk), .din(f2val_in[7:0]), .dout(f2val[7:0]));
|
|
|
|
assign sf1val[7:0] = ({8{f1_shift_2B}} & {1'b0,f1val[7:1]}) |
|
|
({8{f1_shift_4B}} & {2'b0,f1val[7:2]}) |
|
|
({8{f1_shift_6B}} & {3'b0,f1val[7:3]}) |
|
|
({8{~f1_shift_2B&~f1_shift_4B&~f1_shift_6B}} & f1val[7:0]);
|
|
|
|
assign f1val_in[7:0] = (({8{fetch_to_f1}} & ifu_fetch_val[7:0]) |
|
|
({8{shift_f2_f1}} & f2val[7:0]) |
|
|
({8{~fetch_to_f1&~shift_f2_f1&~shift_f1_f0}} & sf1val[7:0])) & ~{8{exu_flush_final}};
|
|
|
|
rvdff #(8) f1valff (.*, .clk(active_clk), .din(f1val_in[7:0]), .dout(f1val[7:0]));
|
|
|
|
|
|
assign sf0val[7:0] = ({8{shift_2B}} & {1'b0,f0val[7:1]}) |
|
|
({8{shift_4B}} & {2'b0,f0val[7:2]}) |
|
|
({8{shift_6B}} & {3'b0,f0val[7:3]}) |
|
|
({8{shift_8B}} & {4'b0,f0val[7:4]}) |
|
|
({8{~shift_2B&~shift_4B&~shift_6B&~shift_8B}} & f0val[7:0]);
|
|
|
|
assign f0val_in[7:0] = (({8{fetch_to_f0}} & ifu_fetch_val[7:0]) |
|
|
({8{shift_f2_f0}} & f2val[7:0]) |
|
|
({8{shift_f1_f0}} & sf1val[7:0]) |
|
|
({8{~fetch_to_f0&~shift_f2_f0&~shift_f1_f0}} & sf0val[7:0])) & ~{8{exu_flush_final}};
|
|
|
|
rvdff #(8) f0valff (.*, .clk(active_clk), .din(f0val_in[7:0]), .dout(f0val[7:0]));
|
|
|
|
// parity
|
|
|
|
`ifdef RV_ICACHE_ECC
|
|
rvdffe #(40) q2eccff (.*, .en(qwen[2]), .din(ic_error_f2.ecc[39:0]), .dout(q2ecc[39:0]));
|
|
rvdffe #(40) q1eccff (.*, .en(qwen[1]), .din(ic_error_f2.ecc[39:0]), .dout(q1ecc[39:0]));
|
|
rvdffe #(40) q0eccff (.*, .en(qwen[0]), .din(ic_error_f2.ecc[39:0]), .dout(q0ecc[39:0]));
|
|
|
|
|
|
assign {q1ecceff[39:0],q0ecceff[39:0]} = (({80{qren[0]}} & {q1ecc[39:0],q0ecc[39:0]}) |
|
|
({80{qren[1]}} & {q2ecc[39:0],q1ecc[39:0]}) |
|
|
({80{qren[2]}} & {q0ecc[39:0],q2ecc[39:0]}));
|
|
|
|
assign q0eccfinal[39:0] = (({40{q0sel[0]}} & { q0ecceff[8*5-1:0*5]}) |
|
|
({40{q0sel[1]}} & { 5'b0,q0ecceff[8*5-1:1*5]}) |
|
|
({40{q0sel[2]}} & {10'b0,q0ecceff[8*5-1:2*5]}) |
|
|
({40{q0sel[3]}} & {15'b0,q0ecceff[8*5-1:3*5]}) |
|
|
({40{q0sel[4]}} & {20'b0,q0ecceff[8*5-1:4*5]}) |
|
|
({40{q0sel[5]}} & {25'b0,q0ecceff[8*5-1:5*5]}) |
|
|
({40{q0sel[6]}} & {30'b0,q0ecceff[8*5-1:6*5]}) |
|
|
({40{q0sel[7]}} & {35'b0,q0ecceff[8*5-1:7*5]}));
|
|
|
|
assign q1eccfinal[39:0] = (({40{q1sel[0]}} & { q1ecceff[8*5-1:0*5]}) |
|
|
({40{q1sel[1]}} & { 5'b0,q1ecceff[8*5-1:1*5]}) |
|
|
({40{q1sel[2]}} & {10'b0,q1ecceff[8*5-1:2*5]}) |
|
|
({40{q1sel[3]}} & {15'b0,q1ecceff[8*5-1:3*5]}) |
|
|
({40{q1sel[4]}} & {20'b0,q1ecceff[8*5-1:4*5]}) |
|
|
({40{q1sel[5]}} & {25'b0,q1ecceff[8*5-1:5*5]}) |
|
|
({40{q1sel[6]}} & {30'b0,q1ecceff[8*5-1:6*5]}) |
|
|
({40{q1sel[7]}} & {35'b0,q1ecceff[8*5-1:7*5]}));
|
|
|
|
`else
|
|
rvdffe #(8) q2parityff (.*, .en(qwen[2]), .din(ic_error_f2.parity[7:0]), .dout(q2parity[7:0]));
|
|
rvdffe #(8) q1parityff (.*, .en(qwen[1]), .din(ic_error_f2.parity[7:0]), .dout(q1parity[7:0]));
|
|
rvdffe #(8) q0parityff (.*, .en(qwen[0]), .din(ic_error_f2.parity[7:0]), .dout(q0parity[7:0]));
|
|
|
|
|
|
assign {q1parityeff[7:0],q0parityeff[7:0]} = (({16{qren[0]}} & {q1parity[7:0],q0parity[7:0]}) |
|
|
({16{qren[1]}} & {q2parity[7:0],q1parity[7:0]}) |
|
|
({16{qren[2]}} & {q0parity[7:0],q2parity[7:0]}));
|
|
|
|
assign q0parityfinal[7:0] = (({8{q0sel[0]}} & { q0parityeff[7:0]}) |
|
|
({8{q0sel[1]}} & {1'b0,q0parityeff[7:1]}) |
|
|
({8{q0sel[2]}} & {2'b0,q0parityeff[7:2]}) |
|
|
({8{q0sel[3]}} & {3'b0,q0parityeff[7:3]}) |
|
|
({8{q0sel[4]}} & {4'b0,q0parityeff[7:4]}) |
|
|
({8{q0sel[5]}} & {5'b0,q0parityeff[7:5]}) |
|
|
({8{q0sel[6]}} & {6'b0,q0parityeff[7:6]}) |
|
|
({8{q0sel[7]}} & {7'b0,q0parityeff[7]}));
|
|
|
|
assign q1parityfinal[7:0] = (({8{q1sel[0]}} & { q1parityeff[7:0]}) |
|
|
({8{q1sel[1]}} & {1'b0,q1parityeff[7:1]}) |
|
|
({8{q1sel[2]}} & {2'b0,q1parityeff[7:2]}) |
|
|
({8{q1sel[3]}} & {3'b0,q1parityeff[7:3]}) |
|
|
({8{q1sel[4]}} & {4'b0,q1parityeff[7:4]}) |
|
|
({8{q1sel[5]}} & {5'b0,q1parityeff[7:5]}) |
|
|
({8{q1sel[6]}} & {6'b0,q1parityeff[7:6]}) |
|
|
({8{q1sel[7]}} & {7'b0,q1parityeff[7]}));
|
|
`endif // !`ifdef RV_ICACHE_ECC
|
|
|
|
rvdffe #(128) q2ff (.*, .en(qwen[2]), .din(ifu_fetch_data[127:0]), .dout(q2[127:0]));
|
|
rvdffe #(128) q1ff (.*, .en(qwen[1]), .din(ifu_fetch_data[127:0]), .dout(q1[127:0]));
|
|
rvdffe #(128) q0ff (.*, .en(qwen[0]), .din(ifu_fetch_data[127:0]), .dout(q0[127:0]));
|
|
|
|
|
|
assign {q1eff[127:0],q0eff[127:0]} = (({256{qren[0]}} & {q1[127:0],q0[127:0]}) |
|
|
({256{qren[1]}} & {q2[127:0],q1[127:0]}) |
|
|
({256{qren[2]}} & {q0[127:0],q2[127:0]}));
|
|
|
|
assign q0final[127:0] = (({128{q0sel[0]}} & { q0eff[8*16-1:16*0]}) |
|
|
({128{q0sel[1]}} & {{16*1{1'b0}},q0eff[8*16-1:16*1]}) |
|
|
({128{q0sel[2]}} & {{16*2{1'b0}},q0eff[8*16-1:16*2]}) |
|
|
({128{q0sel[3]}} & {{16*3{1'b0}},q0eff[8*16-1:16*3]}) |
|
|
({128{q0sel[4]}} & {{16*4{1'b0}},q0eff[8*16-1:16*4]}) |
|
|
({128{q0sel[5]}} & {{16*5{1'b0}},q0eff[8*16-1:16*5]}) |
|
|
({128{q0sel[6]}} & {{16*6{1'b0}},q0eff[8*16-1:16*6]}) |
|
|
({128{q0sel[7]}} & {{16*7{1'b0}},q0eff[8*16-1:16*7]}));
|
|
|
|
assign q1final[127:0] = (({128{q1sel[0]}} & { q1eff[8*16-1:16*0]}) |
|
|
({128{q1sel[1]}} & {{16*1{1'b0}},q1eff[8*16-1:16*1]}) |
|
|
({128{q1sel[2]}} & {{16*2{1'b0}},q1eff[8*16-1:16*2]}) |
|
|
({128{q1sel[3]}} & {{16*3{1'b0}},q1eff[8*16-1:16*3]}) |
|
|
({128{q1sel[4]}} & {{16*4{1'b0}},q1eff[8*16-1:16*4]}) |
|
|
({128{q1sel[5]}} & {{16*5{1'b0}},q1eff[8*16-1:16*5]}) |
|
|
({128{q1sel[6]}} & {{16*6{1'b0}},q1eff[8*16-1:16*6]}) |
|
|
({128{q1sel[7]}} & {{16*7{1'b0}},q1eff[8*16-1:16*7]}));
|
|
|
|
|
|
assign aligndata[63:0] = ({64{(f0val[3])}} & {q0final[4*16-1:0]}) |
|
|
({64{(f0val[2]&~f0val[3])}} & {q1final[1*16-1:0],q0final[3*16-1:0]}) |
|
|
({64{(f0val[1]&~f0val[2])}} & {q1final[2*16-1:0],q0final[2*16-1:0]}) |
|
|
({64{(f0val[0]&~f0val[1])}} & {q1final[3*16-1:0],q0final[1*16-1:0]});
|
|
|
|
assign alignval[3:0] = ({4{(f0val[3])}} & 4'b1111) |
|
|
({4{(f0val[2]&~f0val[3])}} & {f1val[0],3'b111}) |
|
|
({4{(f0val[1]&~f0val[2])}} & {f1val[1:0],2'b11}) |
|
|
({4{(f0val[0]&~f0val[1])}} & {f1val[2:0],1'b1});
|
|
|
|
assign alignicaf[3:0] = ({4{(f0val[3])}} & {4{f0icaf}}) |
|
|
({4{(f0val[2]&~f0val[3])}} & {{1{f1icaf}},{3{f0icaf}}}) |
|
|
({4{(f0val[1]&~f0val[2])}} & {{2{f1icaf}},{2{f0icaf}}}) |
|
|
({4{(f0val[0]&~f0val[1])}} & {{3{f1icaf}},{1{f0icaf}}});
|
|
|
|
|
|
assign alignsbecc[3:0] = ({4{(f0val[3])}} & {4{f0sbecc}}) |
|
|
({4{(f0val[2]&~f0val[3])}} & {{1{f1sbecc}},{3{f0sbecc}}}) |
|
|
({4{(f0val[1]&~f0val[2])}} & {{2{f1sbecc}},{2{f0sbecc}}}) |
|
|
({4{(f0val[0]&~f0val[1])}} & {{3{f1sbecc}},{1{f0sbecc}}});
|
|
|
|
|
|
assign aligndbecc[3:0] = ({4{(f0val[3])}} & {4{f0dbecc}}) |
|
|
({4{(f0val[2]&~f0val[3])}} & {{1{f1dbecc}},{3{f0dbecc}}}) |
|
|
({4{(f0val[1]&~f0val[2])}} & {{2{f1dbecc}},{2{f0dbecc}}}) |
|
|
({4{(f0val[0]&~f0val[1])}} & {{3{f1dbecc}},{1{f0dbecc}}});
|
|
|
|
// for branch prediction
|
|
assign alignbrend[3:0] = ({4{(f0val[3])}} & f0brend[3:0]) |
|
|
({4{(f0val[2]&~f0val[3])}} & {f1brend[0],f0brend[2:0]}) |
|
|
({4{(f0val[1]&~f0val[2])}} & {f1brend[1:0],f0brend[1:0]}) |
|
|
({4{(f0val[0]&~f0val[1])}} & {f1brend[2:0],f0brend[0]});
|
|
|
|
assign alignpc4[3:0] = ({4{(f0val[3])}} & f0pc4[3:0]) |
|
|
({4{(f0val[2]&~f0val[3])}} & {f1pc4[0],f0pc4[2:0]}) |
|
|
({4{(f0val[1]&~f0val[2])}} & {f1pc4[1:0],f0pc4[1:0]}) |
|
|
({4{(f0val[0]&~f0val[1])}} & {f1pc4[2:0],f0pc4[0]});
|
|
|
|
`ifdef RV_ICACHE_ECC
|
|
assign alignecc[19:0] = ({20{(f0val[3])}} & q0eccfinal[19:0]) |
|
|
({20{(f0val[2]&~f0val[3])}} & {q1eccfinal[4:0], q0eccfinal[14:0]}) |
|
|
({20{(f0val[1]&~f0val[2])}} & {q1eccfinal[9:0], q0eccfinal[9:0]}) |
|
|
({20{(f0val[0]&~f0val[1])}} & {q1eccfinal[14:0],q0eccfinal[4:0]});
|
|
`else
|
|
assign alignparity[3:0] = ({4{(f0val[3])}} & q0parityfinal[3:0]) |
|
|
({4{(f0val[2]&~f0val[3])}} & {q1parityfinal[0], q0parityfinal[2:0]}) |
|
|
({4{(f0val[1]&~f0val[2])}} & {q1parityfinal[1:0],q0parityfinal[1:0]}) |
|
|
({4{(f0val[0]&~f0val[1])}} & {q1parityfinal[2:0],q0parityfinal[0]});
|
|
`endif
|
|
|
|
assign aligntagperr[3:0] = ({4{(f0val[3])}} & {4{f0perr}}) |
|
|
({4{(f0val[2]&~f0val[3])}} & {{1{f1perr}},{3{f0perr}}}) |
|
|
({4{(f0val[1]&~f0val[2])}} & {{2{f1perr}},{2{f0perr}}}) |
|
|
({4{(f0val[0]&~f0val[1])}} & {{3{f1perr}},{1{f0perr}}});
|
|
|
|
assign alignicfetch[3:0] = ({4{(f0val[3])}} & {4{f0icfetch}}) |
|
|
({4{(f0val[2]&~f0val[3])}} & {{1{f1icfetch}},{3{f0icfetch}}}) |
|
|
({4{(f0val[1]&~f0val[2])}} & {{2{f1icfetch}},{2{f0icfetch}}}) |
|
|
({4{(f0val[0]&~f0val[1])}} & {{3{f1icfetch}},{1{f0icfetch}}});
|
|
|
|
|
|
assign alignret[3:0] = ({4{(f0val[3])}} & f0ret[3:0]) |
|
|
({4{(f0val[2]&~f0val[3])}} & {f1ret[0],f0ret[2:0]}) |
|
|
({4{(f0val[1]&~f0val[2])}} & {f1ret[1:0],f0ret[1:0]}) |
|
|
({4{(f0val[0]&~f0val[1])}} & {f1ret[2:0],f0ret[0]});
|
|
|
|
`ifdef RV_BTB_48
|
|
|
|
logic [3:0] f0way_b0, f0way_b1, alignway_b0, alignway_b1;
|
|
logic [2:0] f1way_b0, f1way_b1;
|
|
assign f0way_b0[3:0] = {f0way[3][0], f0way[2][0], f0way[1][0], f0way[0][0]};
|
|
assign f0way_b1[3:0] = {f0way[3][1], f0way[2][1], f0way[1][1], f0way[0][1]};
|
|
assign f1way_b0[2:0] = {f1way[2][0], f1way[1][0], f1way[0][0]};
|
|
assign f1way_b1[2:0] = {f1way[2][1], f1way[1][1], f1way[0][1]};
|
|
|
|
assign alignway_b0[3:0] = ({4{(f0val[3])}} & f0way_b0[3:0]) |
|
|
({4{(f0val[2]&~f0val[3])}} & {f1way_b0[0], f0way_b0[2:0]}) |
|
|
({4{(f0val[1]&~f0val[2])}} & {f1way_b0[1:0],f0way_b0[1:0]}) |
|
|
({4{(f0val[0]&~f0val[1])}} & {f1way_b0[2:0],f0way_b0[0]});
|
|
assign alignway_b1[3:0] = ({4{(f0val[3])}} & f0way_b1[3:0]) |
|
|
({4{(f0val[2]&~f0val[3])}} & {f1way_b1[0], f0way_b1[2:0]}) |
|
|
({4{(f0val[1]&~f0val[2])}} & {f1way_b1[1:0],f0way_b1[1:0]}) |
|
|
({4{(f0val[0]&~f0val[1])}} & {f1way_b1[2:0],f0way_b1[0]});
|
|
`else
|
|
assign alignway[3:0] = ({4{(f0val[3])}} & f0way[3:0]) |
|
|
({4{(f0val[2]&~f0val[3])}} & {f1way[0],f0way[2:0]}) |
|
|
({4{(f0val[1]&~f0val[2])}} & {f1way[1:0],f0way[1:0]}) |
|
|
({4{(f0val[0]&~f0val[1])}} & {f1way[2:0],f0way[0]});
|
|
`endif
|
|
assign alignhist1[3:0] = ({4{(f0val[3])}} & f0hist1[3:0]) |
|
|
({4{(f0val[2]&~f0val[3])}} & {f1hist1[0],f0hist1[2:0]}) |
|
|
({4{(f0val[1]&~f0val[2])}} & {f1hist1[1:0],f0hist1[1:0]}) |
|
|
({4{(f0val[0]&~f0val[1])}} & {f1hist1[2:0],f0hist1[0]});
|
|
|
|
assign alignhist0[3:0] = ({4{(f0val[3])}} & f0hist0[3:0]) |
|
|
({4{(f0val[2]&~f0val[3])}} & {f1hist0[0],f0hist0[2:0]}) |
|
|
({4{(f0val[1]&~f0val[2])}} & {f1hist0[1:0],f0hist0[1:0]}) |
|
|
({4{(f0val[0]&~f0val[1])}} & {f1hist0[2:0],f0hist0[0]});
|
|
|
|
assign alignfromf1[3:1] = ({3{(f0val[3])}} & 3'b0) |
|
|
({3{(f0val[2]&~f0val[3])}} & {1'b1,2'b0}) |
|
|
({3{(f0val[1]&~f0val[2])}} & {2'b11,1'b0}) |
|
|
({3{(f0val[0]&~f0val[1])}} & {3'b111});
|
|
|
|
|
|
assign { secondpc[31:1],
|
|
thirdpc[31:1],
|
|
fourthpc[31:1] } = ({3*31{(f0val[3])}} & {f0pc_plus1[31:1], f0pc_plus2[31:1], f0pc_plus3[31:1]}) |
|
|
({3*31{(f0val[2]&~f0val[3])}} & {f0pc_plus1[31:1], f0pc_plus2[31:1], f1pc[31:1]}) |
|
|
({3*31{(f0val[1]&~f0val[2])}} & {f0pc_plus1[31:1], f1pc[31:1], f1pc_plus1[31:1]}) |
|
|
({3*31{(f0val[0]&~f0val[1])}} & {f1pc[31:1], f1pc_plus1[31:1], f1pc_plus2[31:1]});
|
|
|
|
|
|
assign ifu_i0_pc[31:1] = f0pc[31:1];
|
|
|
|
assign firstpc[31:1] = f0pc[31:1];
|
|
|
|
assign ifu_i1_pc[31:1] = (first2B) ? secondpc[31:1] : thirdpc[31:1];
|
|
|
|
|
|
assign ifu_i0_pc4 = first4B;
|
|
|
|
assign ifu_i1_pc4 = (first2B & second4B) |
|
|
(first4B & third4B);
|
|
|
|
// parity checking
|
|
|
|
`ifdef RV_ICACHE_ECC
|
|
|
|
logic [3:0] [31:0] ic_corrected_data_nc;
|
|
logic [3:0] [6:0] ic_corrected_ecc_nc;
|
|
logic [3:0] ic_single_ecc_error;
|
|
logic [3:0] ic_double_ecc_error;
|
|
logic [3:0] aligneccerr;
|
|
|
|
for (genvar i=0; i < 4 ; i++) begin : ic_ecc_error
|
|
rvecc_decode ecc_decode (
|
|
.en(~dec_tlu_core_ecc_disable),
|
|
.sed_ded(1'b1),
|
|
.din({16'b0, aligndata[16*(i+1)-1: (16*i)]}),
|
|
//.ecc_in({alignecc[(i*6)+5], 1'b0, alignecc[(i*6)+4:(i*6)]}),
|
|
.ecc_in({2'b0, alignecc[(i*5)+4:(i*5)]}),
|
|
.dout(ic_corrected_data_nc[i][31:0]),
|
|
.ecc_out(ic_corrected_ecc_nc[i][6:0]),
|
|
.single_ecc_error(ic_single_ecc_error[i]),
|
|
.double_ecc_error(ic_double_ecc_error[i]));
|
|
|
|
// or the sb and db error detects into 1 signal called aligndataperr[i] where i corresponds to 2B position
|
|
assign aligneccerr[i] = ic_single_ecc_error[i] | ic_double_ecc_error[i];
|
|
assign aligndataperr[i] = aligneccerr[i] ;
|
|
end // block: ic_ecc_error
|
|
|
|
`else // !`ifdef RV_ICACHE_ECC
|
|
|
|
for (genvar i=0; i<4 ; i++) begin : ic_par_error
|
|
rveven_paritycheck pchk (
|
|
.data_in(aligndata[16*(i+1)-1: 16*i]),
|
|
.parity_in(alignparity[i]),
|
|
.parity_err(aligndataperr[i])
|
|
);
|
|
end
|
|
|
|
`endif // !`ifdef RV_ICACHE_ECC
|
|
|
|
|
|
// logic for trace
|
|
assign ifu_i0_cinst[15:0] = aligndata[15:0];
|
|
assign ifu_i1_cinst[15:0] = (first4B) ? aligndata[47:32] : aligndata[31:16];
|
|
// end trace
|
|
|
|
// check on 16B boundaries
|
|
//
|
|
assign first4B = aligndata[16*0+1:16*0] == 2'b11;
|
|
assign first2B = ~first4B;
|
|
|
|
assign second4B = aligndata[16*1+1:16*1] == 2'b11;
|
|
assign second2B = ~second4B;
|
|
|
|
assign third4B = aligndata[16*2+1:16*2] == 2'b11;
|
|
assign third2B = ~third4B;
|
|
|
|
assign ifu_i0_valid = ((first4B & alignval[1]) |
|
|
(first2B & alignval[0])) & ~exu_flush_final;
|
|
|
|
assign ifu_i1_valid = ((first4B & third4B & alignval[3]) |
|
|
(first4B & third2B & alignval[2]) |
|
|
(first2B & second4B & alignval[2]) |
|
|
(first2B & second2B & alignval[1])) & ~exu_flush_final;
|
|
|
|
// inst access fault on any byte of inst results in access fault for the inst
|
|
assign ifu_i0_icaf = ((first4B & (|alignicaf[1:0])) |
|
|
(first2B & alignicaf[0])) & ~exu_flush_final;
|
|
|
|
|
|
|
|
assign icaf_eff[3:1] = alignicaf[3:1] | aligndbecc[3:1];
|
|
|
|
assign ifu_i0_icaf_f1 = first4B & icaf_eff[1] & alignfromf1[1];
|
|
|
|
assign ifu_i1_icaf = ((first4B & third4B & (|alignicaf[3:2])) |
|
|
(first4B & third2B & alignicaf[2]) |
|
|
(first2B & second4B & (|alignicaf[2:1])) |
|
|
(first2B & second2B & alignicaf[1])) & ~exu_flush_final;
|
|
|
|
assign ifu_i1_icaf_f1 = (first4B & third4B & icaf_eff[2] & alignfromf1[2]) |
|
|
(first4B & third4B & icaf_eff[3] & alignfromf1[3] & ~icaf_eff[2]) |
|
|
(first2B & second4B & icaf_eff[1] & alignfromf1[1]) |
|
|
(first2B & second4B & icaf_eff[2] & alignfromf1[2] & ~icaf_eff[1]);
|
|
|
|
// inst parity error on any byte of inst results in parity error for the inst
|
|
|
|
|
|
assign alignfinalperr[3:0] = (aligntagperr[3:0] | aligndataperr[3:0]) & alignicfetch[3:0];
|
|
|
|
assign ifu_i0_perr = ((first4B & (|alignfinalperr[1:0])) |
|
|
(first2B & alignfinalperr[0])) & ~exu_flush_final;
|
|
|
|
assign ifu_i1_perr = ((first4B & third4B & (|alignfinalperr[3:2])) |
|
|
(first4B & third2B & alignfinalperr[2]) |
|
|
(first2B & second4B & (|alignfinalperr[2:1])) |
|
|
(first2B & second2B & alignfinalperr[1])) & ~exu_flush_final;
|
|
|
|
assign ifu_i0_sbecc = ((first4B & (|alignsbecc[1:0])) |
|
|
(first2B & alignsbecc[0])) & ~exu_flush_final;
|
|
|
|
assign ifu_i1_sbecc = ((first4B & third4B & (|alignsbecc[3:2])) |
|
|
(first4B & third2B & alignsbecc[2]) |
|
|
(first2B & second4B & (|alignsbecc[2:1])) |
|
|
(first2B & second2B & alignsbecc[1])) & ~exu_flush_final;
|
|
|
|
assign ifu_i0_dbecc = ((first4B & (|aligndbecc[1:0])) |
|
|
(first2B & aligndbecc[0])) & ~exu_flush_final;
|
|
|
|
assign ifu_i1_dbecc = ((first4B & third4B & (|aligndbecc[3:2])) |
|
|
(first4B & third2B & aligndbecc[2]) |
|
|
(first2B & second4B & (|aligndbecc[2:1])) |
|
|
(first2B & second2B & aligndbecc[1])) & ~exu_flush_final;
|
|
|
|
// send index information to the icache on a parity or single-bit ecc error
|
|
// parity error is orthogonal to single-bit ecc error; icache vs iccm
|
|
|
|
logic [2:0] alignicerr;
|
|
|
|
assign alignicerr[2:0] = alignfinalperr[2:0] | alignsbecc[2:0];
|
|
|
|
assign ifu_icache_error_index[16:2] = (alignicerr[0]) ? firstpc[16:2] :
|
|
(alignicerr[1]) ? secondpc[16:2] :
|
|
(alignicerr[2]) ? thirdpc[16:2] :
|
|
fourthpc[16:2];
|
|
|
|
assign ifu_icache_error_val = (i0_shift & ifu_i0_perr) |
|
|
(i1_shift & ifu_i1_perr & ~ifu_i0_sbecc);
|
|
|
|
assign ifu_icache_sb_error_val = (i0_shift & ifu_i0_sbecc) |
|
|
(i1_shift & ifu_i1_sbecc & ~ifu_i0_perr);
|
|
|
|
`ifdef ASSERT_ON
|
|
assert_ifu_icache_parity_with_sbecc_error: assert #0 ($onehot0({ifu_icache_error_val,ifu_icache_sb_error_val}));
|
|
`endif
|
|
// big endian 4B instructions
|
|
|
|
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|
assign ifirst[31:0] = aligndata[2*16-1:0*16];
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|
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|
assign isecond[31:0] = aligndata[3*16-1:1*16];
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assign ithird[31:0] = aligndata[4*16-1:2*16];
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assign ifu_i0_instr[31:0] = ({32{first4B}} & ifirst[31:0]) |
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({32{first2B}} & uncompress0[31:0]);
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|
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assign ifu_i1_instr[31:0] = ({32{first4B & third4B}} & ithird[31:0]) |
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({32{first4B & third2B}} & uncompress2[31:0]) |
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({32{first2B & second4B}} & isecond[31:0]) |
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({32{first2B & second2B}} & uncompress1[31:0]);
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// if you detect br does not start on instruction boundary
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rvbtb_addr_hash firsthash(.pc(firstpc[31:1]), .hash(firstpc_hash[`RV_BTB_ADDR_HI:`RV_BTB_ADDR_LO]));
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rvbtb_addr_hash secondhash(.pc(secondpc[31:1]), .hash(secondpc_hash[`RV_BTB_ADDR_HI:`RV_BTB_ADDR_LO]));
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rvbtb_addr_hash thirdhash(.pc(thirdpc[31:1]), .hash(thirdpc_hash[`RV_BTB_ADDR_HI:`RV_BTB_ADDR_LO]));
|
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rvbtb_addr_hash fourthhash(.pc(fourthpc[31:1]), .hash(fourthpc_hash[`RV_BTB_ADDR_HI:`RV_BTB_ADDR_LO]));
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logic [`RV_BTB_BTAG_SIZE-1:0] firstbrtag_hash, secondbrtag_hash, thirdbrtag_hash, fourthbrtag_hash;
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rvbtb_tag_hash first_brhash(.pc(firstpc[31:1]), .hash(firstbrtag_hash[`RV_BTB_BTAG_SIZE-1:0]));
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rvbtb_tag_hash second_brhash(.pc(secondpc[31:1]), .hash(secondbrtag_hash[`RV_BTB_BTAG_SIZE-1:0]));
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rvbtb_tag_hash third_brhash(.pc(thirdpc[31:1]), .hash(thirdbrtag_hash[`RV_BTB_BTAG_SIZE-1:0]));
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rvbtb_tag_hash fourth_brhash(.pc(fourthpc[31:1]), .hash(fourthbrtag_hash[`RV_BTB_BTAG_SIZE-1:0]));
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// start_indexing - you want pc to be based on where the end of branch is prediction
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// normal indexing pc based that's incorrect now for pc4 cases it's pc4 + 2
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always_comb begin
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i0_brp = '0;
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i0_br_start_error = (first4B & alignval[1] & alignbrend[0]);
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i0_brp.valid = (first2B & alignbrend[0]) |
|
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(first4B & alignbrend[1]) |
|
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i0_br_start_error;
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i0_brp_pc4 = (first2B & alignpc4[0]) |
|
|
(first4B & alignpc4[1]);
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|
|
i0_brp.ret = (first2B & alignret[0]) |
|
|
(first4B & alignret[1]);
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|
|
|
`ifdef RV_BTB_48
|
|
i0_brp.way = (first2B | alignbrend[0]) ? {alignway_b1[0], alignway_b0[0]} : {alignway_b1[1], alignway_b0[1]};
|
|
`else
|
|
i0_brp.way = (first2B | alignbrend[0]) ? alignway[0] : alignway[1];
|
|
`endif
|
|
i0_brp.hist[1] = (first2B & alignhist1[0]) |
|
|
(first4B & alignhist1[1]);
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|
|
i0_brp.hist[0] = (first2B & alignhist0[0]) |
|
|
(first4B & alignhist0[1]);
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|
i0_ends_f1 = (first4B & alignfromf1[1]);
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|
|
i0_brp.toffset[11:0] = (i0_ends_f1) ? f1poffset[11:0] : f0poffset[11:0];
|
|
|
|
i0_brp.fghr[`RV_BHT_GHR_RANGE] = (i0_ends_f1) ? f1fghr[`RV_BHT_GHR_RANGE] : f0fghr[`RV_BHT_GHR_RANGE];
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|
|
|
i0_brp.prett[31:1] = (i0_ends_f1) ? f1prett[31:1] : f0prett[31:1];
|
|
|
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i0_brp.br_start_error = i0_br_start_error;
|
|
|
|
i0_brp.index[`RV_BTB_ADDR_HI:`RV_BTB_ADDR_LO] = (first2B | alignbrend[0]) ? firstpc_hash[`RV_BTB_ADDR_HI:`RV_BTB_ADDR_LO]:
|
|
secondpc_hash[`RV_BTB_ADDR_HI:`RV_BTB_ADDR_LO];
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|
|
|
i0_brp.btag[`RV_BTB_BTAG_SIZE-1:0] = (first2B | alignbrend[0]) ? firstbrtag_hash[`RV_BTB_BTAG_SIZE-1:0]:
|
|
secondbrtag_hash[`RV_BTB_BTAG_SIZE-1:0];
|
|
|
|
i0_brp.bank[1:0] = (first2B | alignbrend[0]) ? firstpc[3:2] :
|
|
secondpc[3:2];
|
|
|
|
|
|
i0_brp.br_error = (i0_brp.valid & i0_brp_pc4 & first2B) |
|
|
(i0_brp.valid & ~i0_brp_pc4 & first4B);
|
|
|
|
i1_brp = '0;
|
|
|
|
i1_br_start_error = (first2B & second4B & alignval[2] & alignbrend[1]) |
|
|
(first4B & third4B & alignval[3] & alignbrend[2]);
|
|
|
|
i1_brp.valid = (first4B & third2B & alignbrend[2]) |
|
|
(first4B & third4B & alignbrend[3]) |
|
|
(first2B & second2B & alignbrend[1]) |
|
|
(first2B & second4B & alignbrend[2]) |
|
|
i1_br_start_error;
|
|
|
|
i1_brp_pc4 = (first4B & third2B & alignpc4[2]) |
|
|
(first4B & third4B & alignpc4[3]) |
|
|
(first2B & second2B & alignpc4[1]) |
|
|
(first2B & second4B & alignpc4[2]);
|
|
|
|
i1_brp.ret = (first4B & third2B & alignret[2]) |
|
|
(first4B & third4B & alignret[3]) |
|
|
(first2B & second2B & alignret[1]) |
|
|
(first2B & second4B & alignret[2]);
|
|
`ifdef RV_BTB_48
|
|
i1_brp.way = ({2{first4B & third2B }} & {alignway_b1[2], alignway_b0[2]} ) |
|
|
({2{first4B & third4B & alignbrend[2] }} & {alignway_b1[2], alignway_b0[2]} ) |
|
|
({2{first4B & third4B & ~alignbrend[2] }} & {alignway_b1[3], alignway_b0[3]} ) |
|
|
({2{first2B & second2B }} & {alignway_b1[1], alignway_b0[1]} ) |
|
|
({2{first2B & second4B & alignbrend[1]}} & {alignway_b1[1], alignway_b0[1]} ) |
|
|
({2{first2B & second4B & ~alignbrend[1]}} & {alignway_b1[2], alignway_b0[2]} );
|
|
`else
|
|
i1_brp.way = (first4B & third2B & alignway[2] ) |
|
|
(first4B & third4B & alignbrend[2] & alignway[2] ) |
|
|
(first4B & third4B & ~alignbrend[2] & alignway[3] ) |
|
|
(first2B & second2B & alignway[1] ) |
|
|
(first2B & second4B & alignbrend[1] & alignway[1] ) |
|
|
(first2B & second4B & ~alignbrend[1] & alignway[2] );
|
|
`endif
|
|
i1_brp.hist[1] = (first4B & third2B & alignhist1[2]) |
|
|
(first4B & third4B & alignhist1[3]) |
|
|
(first2B & second2B & alignhist1[1]) |
|
|
(first2B & second4B & alignhist1[2]);
|
|
|
|
i1_brp.hist[0] = (first4B & third2B & alignhist0[2]) |
|
|
(first4B & third4B & alignhist0[3]) |
|
|
(first2B & second2B & alignhist0[1]) |
|
|
(first2B & second4B & alignhist0[2]);
|
|
|
|
i1_ends_f1 = (first4B & third2B & alignfromf1[2]) |
|
|
(first4B & third4B & alignfromf1[3]) |
|
|
(first2B & second2B & alignfromf1[1]) |
|
|
(first2B & second4B & alignfromf1[2]);
|
|
|
|
i1_brp.toffset[11:0] = (i1_ends_f1) ? f1poffset[11:0] : f0poffset[11:0];
|
|
|
|
i1_brp.fghr[`RV_BHT_GHR_RANGE] = (i1_ends_f1) ? f1fghr[`RV_BHT_GHR_RANGE] : f0fghr[`RV_BHT_GHR_RANGE];
|
|
|
|
i1_brp.prett[31:1] = (i1_ends_f1) ? f1prett[31:1] : f0prett[31:1];
|
|
|
|
i1_brp.br_start_error = i1_br_start_error;
|
|
|
|
`define RV_BTB_RANGE `RV_BTB_ADDR_HI-`RV_BTB_ADDR_LO+1
|
|
|
|
i1_brp.index[`RV_BTB_ADDR_HI:`RV_BTB_ADDR_LO] = ({`RV_BTB_RANGE{first4B & third2B }} & thirdpc_hash[`RV_BTB_ADDR_HI:`RV_BTB_ADDR_LO] ) |
|
|
({`RV_BTB_RANGE{first4B & third4B & alignbrend[2] }} & thirdpc_hash[`RV_BTB_ADDR_HI:`RV_BTB_ADDR_LO] ) |
|
|
({`RV_BTB_RANGE{first4B & third4B & ~alignbrend[2] }} & fourthpc_hash[`RV_BTB_ADDR_HI:`RV_BTB_ADDR_LO] ) |
|
|
({`RV_BTB_RANGE{first2B & second2B}} & secondpc_hash[`RV_BTB_ADDR_HI:`RV_BTB_ADDR_LO] ) |
|
|
({`RV_BTB_RANGE{first2B & second4B & alignbrend[1]}} & secondpc_hash[`RV_BTB_ADDR_HI:`RV_BTB_ADDR_LO] ) |
|
|
({`RV_BTB_RANGE{first2B & second4B & ~alignbrend[1]}} & thirdpc_hash[`RV_BTB_ADDR_HI:`RV_BTB_ADDR_LO] );
|
|
|
|
i1_brp.btag[`RV_BTB_BTAG_SIZE-1:0] = ({`RV_BTB_BTAG_SIZE{first4B & third2B }} & thirdbrtag_hash[`RV_BTB_BTAG_SIZE-1:0] ) |
|
|
({`RV_BTB_BTAG_SIZE{first4B & third4B & alignbrend[2] }} & thirdbrtag_hash[`RV_BTB_BTAG_SIZE-1:0] ) |
|
|
({`RV_BTB_BTAG_SIZE{first4B & third4B & ~alignbrend[2] }} & fourthbrtag_hash[`RV_BTB_BTAG_SIZE-1:0] ) |
|
|
({`RV_BTB_BTAG_SIZE{first2B & second2B}} & secondbrtag_hash[`RV_BTB_BTAG_SIZE-1:0] ) |
|
|
({`RV_BTB_BTAG_SIZE{first2B & second4B & alignbrend[1]}} & secondbrtag_hash[`RV_BTB_BTAG_SIZE-1:0] ) |
|
|
({`RV_BTB_BTAG_SIZE{first2B & second4B & ~alignbrend[1]}} & thirdbrtag_hash[`RV_BTB_BTAG_SIZE-1:0] );
|
|
|
|
i1_brp.bank[1:0] = ({2{first4B & third2B }} & thirdpc[3:2] ) |
|
|
({2{first4B & third4B & alignbrend[2] }} & thirdpc[3:2] ) |
|
|
({2{first4B & third4B & ~alignbrend[2] }} & fourthpc[3:2] ) |
|
|
({2{first2B & second2B}} & secondpc[3:2] ) |
|
|
({2{first2B & second4B & alignbrend[1]}} & secondpc[3:2] ) |
|
|
({2{first2B & second4B & ~alignbrend[1]}} & thirdpc[3:2] );
|
|
|
|
i1_brp.br_error = (i1_brp.valid & i1_brp_pc4 & first4B & third2B ) |
|
|
(i1_brp.valid & ~i1_brp_pc4 & first4B & third4B ) |
|
|
(i1_brp.valid & i1_brp_pc4 & first2B & second2B) |
|
|
(i1_brp.valid & ~i1_brp_pc4 & first2B & second4B);
|
|
end
|
|
|
|
// figure out 2B illegal insts
|
|
|
|
assign i0_illegal = (first2B & ~first_legal);
|
|
|
|
assign i1_illegal = (first2B & second2B & ~second_legal) |
|
|
(first4B & third2B & ~third_legal);
|
|
|
|
assign shift_illegal = (i0_shift & i0_illegal) |
|
|
(i1_shift & i1_illegal);
|
|
|
|
assign illegal_inst[15:0] = (first2B & ~first_legal) ? aligndata[1*16-1:0*16] :
|
|
((first2B & second2B & ~second_legal) ? aligndata[2*16-1:1*16] : aligndata[3*16-1:2*16]);
|
|
|
|
assign illegal_inst_en = shift_illegal & ~illegal_lockout;
|
|
|
|
rvdffe #(16) illegal_any_ff (.*, .en(illegal_inst_en), .din(illegal_inst[15:0]), .dout(ifu_illegal_inst[15:0]));
|
|
|
|
assign illegal_lockout_in = (shift_illegal | illegal_lockout) & ~exu_flush_final;
|
|
|
|
rvdff #(1) illegal_lockout_any_ff (.*, .clk(active_clk), .din(illegal_lockout_in), .dout(illegal_lockout));
|
|
|
|
|
|
// decompress
|
|
|
|
ifu_compress_ctl compress0 (.din(aligndata[16*1-1:0*16]), .dout(uncompress0[31:0]), .legal(first_legal) );
|
|
|
|
ifu_compress_ctl compress1 (.din(aligndata[16*2-1:1*16]), .dout(uncompress1[31:0]), .legal(second_legal) );
|
|
|
|
ifu_compress_ctl compress2 (.din(aligndata[16*3-1:2*16]), .dout(uncompress2[31:0]), .legal(third_legal) );
|
|
|
|
|
|
|
|
assign i0_shift = ifu_i0_valid & ibuffer_room1_more;
|
|
|
|
assign i1_shift = ifu_i1_valid & ibuffer_room2_more;
|
|
|
|
if (DEC_INSTBUF_DEPTH==4) begin
|
|
assign ibuffer_room1_more = ~dec_ib3_valid_d;
|
|
assign ibuffer_room2_more = ~dec_ib2_valid_d;
|
|
end
|
|
else begin
|
|
assign ibuffer_room1_more = ~dec_ib0_valid_eff_d | ~dec_ib1_valid_eff_d;
|
|
assign ibuffer_room2_more = ~dec_ib0_valid_eff_d & ~dec_ib1_valid_eff_d;
|
|
end
|
|
|
|
|
|
|
|
assign ifu_pmu_instr_aligned[1:0] = { i1_shift, i0_shift };
|
|
|
|
assign ifu_pmu_align_stall = ifu_i0_valid & ~ibuffer_room1_more;
|
|
|
|
// compute how many bytes are being shifted from f0
|
|
|
|
// assign shift_0B = ~i0_shift;
|
|
|
|
assign shift_2B = i0_shift & ~i1_shift & first2B;
|
|
|
|
|
|
assign shift_4B = (i0_shift & ~i1_shift & first4B) |
|
|
(i0_shift & i1_shift & first2B & second2B);
|
|
|
|
assign shift_6B = (i0_shift & i1_shift & first2B & second4B) |
|
|
(i0_shift & i1_shift & first4B & third2B);
|
|
|
|
assign shift_8B = i0_shift & i1_shift & first4B & third4B;
|
|
|
|
// exact equations for the queue logic
|
|
assign f0_shift_2B = (shift_2B & f0val[0]) |
|
|
((shift_4B | shift_6B | shift_8B) & f0val[0] & ~f0val[1]);
|
|
|
|
assign f0_shift_4B = (shift_4B & f0val[1]) |
|
|
((shift_6B & shift_8B) & f0val[1] & ~f0val[2]);
|
|
|
|
|
|
assign f0_shift_6B = (shift_6B & f0val[2]) |
|
|
(shift_8B & f0val[2] & ~f0val[3]);
|
|
|
|
assign f0_shift_8B = shift_8B & f0val[3];
|
|
|
|
|
|
|
|
// f0 valid states
|
|
//
|
|
// 11111111
|
|
// 11111110
|
|
// 11111100
|
|
// 11111000
|
|
// 11110000
|
|
|
|
// 11100000
|
|
// 11000000
|
|
// 10000000
|
|
// 00000000
|
|
|
|
// assign f1_shift_0B = shift_0B;
|
|
|
|
assign f1_shift_2B = (f0val[2] & ~f0val[3] & shift_8B) |
|
|
(f0val[1] & ~f0val[2] & shift_6B) |
|
|
(f0val[0] & ~f0val[1] & shift_4B);
|
|
|
|
assign f1_shift_4B = (f0val[1] & ~f0val[2] & shift_8B) |
|
|
(f0val[0] & ~f0val[1] & shift_6B);
|
|
|
|
assign f1_shift_6B = (f0val[0] & ~f0val[1] & shift_8B);
|
|
|
|
|
|
|
|
endmodule
|
|
|