wu-arch/vortex
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

cache req datapath optimizations

Browse Source
This commit is contained in:
Blaise Tine
2020-12-08 02:58:08 -08:00
parent 268ad15098
commit d5fa82f5e4
17 changed files with 393 additions and 410 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
hw/rtl/cache/VX_bank.v vendored
View File

@@ -264,7 +264,9 @@ module VX_bank #(
.full (creq_full)
);
reg [$clog2(MSHR_SIZE+1)-1:0] mshr_pending_size;
reg [$clog2(MSHR_SIZE+1)-1:0] mshr_pending_size;
wire [$clog2(MSHR_SIZE+1)-1:0] mshr_pending_size_n;
reg mshr_going_full;
wire mshr_pop;
wire mshr_valid_st0;
wire[`REQS_BITS-1:0] mshr_tid_st0;
@@ -346,14 +348,12 @@ module VX_bank #(
wire dreq_push_stall;
wire srsq_push_stall;
wire pipeline_stall;
wire is_mshr_miss_st2 = valid_st2 && is_mshr_st2 && (miss_st2 || force_miss_st2);
wire is_mshr_miss_st3 = valid_st3 && is_mshr_st3 && (miss_st3 || force_miss_st3);
wire creq_commit = valid_st1 && core_req_hit_st1 && !pipeline_stall;
wire mshr_going_full = (mshr_pending_size == MSHR_SIZE);
// determine which queue to pop next in piority order
wire mshr_pop_unqual = mshr_valid_st0;
wire drsq_pop_unqual = !mshr_pop_unqual && !drsq_empty;
@@ -367,13 +367,16 @@ module VX_bank #(
assign sreq_pop = sreq_pop_unqual && !pipeline_stall;
// MSHR pending size
assign mshr_pending_size_n = mshr_pending_size +
((creq_pop && !creq_commit) ? 1 : ((creq_commit && !creq_pop) ? -1 : 0));
always @(posedge clk) begin
if (reset) begin
mshr_pending_size <= 0;
mshr_going_full <= 0;
end else begin
mshr_pending_size <= mshr_pending_size +
((creq_pop && !creq_commit) ? 1 : ((creq_commit && !creq_pop) ? -1 : 0));
end
mshr_pending_size <= mshr_pending_size_n;
mshr_going_full <= (mshr_pending_size_n == MSHR_SIZE);
end
end
assign is_mshr_st0 = mshr_pop_unqual;
@@ -736,7 +739,7 @@ end
.enqueue_byteen_st3 (req_byteen_st3),
.enqueue_is_snp_st3 (is_snp_st3),
.enqueue_snp_inv_st3(snp_inv_st3),
.enqueue_mshr_st3 (is_mshr_st3),
.enqueue_is_mshr_st3(is_mshr_st3),
.enqueue_ready_st3 (mshr_init_ready_state_st3),
.enqueue_full (mshr_full),