github-mirrors/cva5
1
0
Fork 0
mirror of https://github.com/openhwgroup/cva5.git synced 2025-04-20 12:07:53 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

fowarding path performance fix

Browse source
This commit is contained in:
Eric Matthews 2019-08-23 22:22:09 -07:00
parent b3d39d0ebf
commit a8d7872c45
1 changed files with 11 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

18
core/register_file.sv
View file

@ -1,5 +1,5 @@
/*
* Copyright © 2017, 2018 Eric Matthews, Lesley Shannon
* Copyright © 2017-2019 Eric Matthews, Lesley Shannon
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -44,7 +44,8 @@ module register_file(
logic in_use_match;
instruction_id_t in_use_by_id;
instruction_id_t rs1_id;
instruction_id_t rs2_id;
//////////////////////////////////////////
//Assign zero to r0 and initialize all registers to zero
initial begin
@ -76,16 +77,19 @@ module register_file(
end
assign in_use_by_id = in_use_by[rf_wb.rd_addr];
assign in_use_match = ({3'b011, in_use_by_id} == {gc_supress_writeback, rf_wb.rd_nzero, rf_wb.valid_write, rf_wb.id});
assign rs1_id = in_use_by[rf_decode.rs1_addr];
assign rs2_id = in_use_by[rf_decode.rs2_addr];
assign in_use_match = ~gc_supress_writeback && rf_wb.rd_nzero && rf_wb.valid_write && (rf_wb.id == in_use_by_id);
assign rs1_feedforward = ({4'b0111, in_use_by_id, rf_decode.rs1_addr} == {gc_supress_writeback, rf_wb.rd_nzero, rf_decode.uses_rs1, rf_wb.valid_write, rf_wb.id, rf_wb.rd_addr});
assign rs2_feedforward = ({4'b0111, in_use_by_id, rf_decode.rs2_addr} == {gc_supress_writeback, rf_wb.rd_nzero, rf_decode.uses_rs2, rf_wb.valid_write, rf_wb.id, rf_wb.rd_addr});
assign rs1_feedforward = rs1_inuse && (rs1_id == rf_wb.id) && rf_wb.valid_write;
assign rs2_feedforward = rs2_inuse && (rs2_id == rf_wb.id) && rf_wb.valid_write;
assign rf_decode.rs1_data = rs1_feedforward ? rf_wb.rd_data : register[rf_decode.rs1_addr];
assign rf_decode.rs2_data = rs2_feedforward ? rf_wb.rd_data : register[rf_decode.rs2_addr];
assign rf_decode.rs1_conflict = rs1_inuse & ~rs1_feedforward;
assign rf_decode.rs2_conflict = rs2_inuse & ~rs2_feedforward;
assign rf_decode.rs1_conflict = rf_decode.uses_rs1 & rs1_inuse & ~rs1_feedforward;
assign rf_decode.rs2_conflict = rf_decode.uses_rs2 & rs2_inuse & ~rs2_feedforward;
////////////////////////////////////////////////////
//Assertions