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Remove two cycle load-use stall

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There's no need for it as we forward results from the writeback to the
execute stage.
This commit is contained in:
Graham Edgecombe 2017-12-05 21:12:37 +00:00
parent 9541f198c2
commit da26f86f25
2 changed files with 0 additions and 10 deletions
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4
rv32.sv
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@ -25,10 +25,6 @@ module rv32 (
.decode_rd_in(decode_rd), .decode_rd_in(decode_rd),
.decode_rd_writeback_in(decode_rd_writeback), .decode_rd_writeback_in(decode_rd_writeback),
.execute_mem_read_en_in(execute_mem_read_en),
.execute_rd_in(execute_rd),
.execute_rd_writeback_in(execute_rd_writeback),
.mem_branch_taken_in(mem_branch_taken), .mem_branch_taken_in(mem_branch_taken),
/* control out */ /* control out */

6
rv32_hazard.sv
View file

@ -10,10 +10,6 @@ module rv32_hazard (
input [4:0] decode_rd_in, input [4:0] decode_rd_in,
input decode_rd_writeback_in, input decode_rd_writeback_in,
input execute_mem_read_en_in,
input [4:0] execute_rd_in,
input execute_rd_writeback_in,
input mem_branch_taken_in, input mem_branch_taken_in,
/* control out */ /* control out */
@ -34,8 +30,6 @@ module rv32_hazard (
always_comb begin always_comb begin
if ((decode_rs1_in == decode_rd_in || decode_rs2_in == decode_rd_in) && |decode_rd_in && decode_mem_read_en_in && decode_rd_writeback_in) if ((decode_rs1_in == decode_rd_in || decode_rs2_in == decode_rd_in) && |decode_rd_in && decode_mem_read_en_in && decode_rd_writeback_in)
fetch_wait_for_mem_read = 1; fetch_wait_for_mem_read = 1;
else if ((decode_rs1_in == execute_rd_in || decode_rs2_in == execute_rd_in) && |execute_rd_in && execute_mem_read_en_in && execute_rd_writeback_in)
fetch_wait_for_mem_read = 1;
else else
fetch_wait_for_mem_read = 0; fetch_wait_for_mem_read = 0;
end end