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fetch optimization

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This commit is contained in:
Blaise Tine 2021-08-07 12:57:14 -07:00
parent 7ae5da914e
commit b5af2065ee
2 changed files with 22 additions and 15 deletions
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35
hw/rtl/VX_warp_sched.v
View file

@ -34,19 +34,21 @@ module VX_warp_sched #(
// Lock warp until instruction decode to resolve branches
reg [`NUM_WARPS-1:0] fetch_lock;
reg [`NUM_THREADS-1:0] thread_masks [`NUM_WARPS-1:0];
reg [31:0] warp_pcs [`NUM_WARPS-1:0];
reg [`NUM_WARPS-1:0][`NUM_THREADS-1:0] thread_masks;
reg [`NUM_WARPS-1:0][31:0] warp_pcs, warp_next_pcs;
// barriers
reg [`NUM_WARPS-1:0] barrier_stall_mask [`NUM_BARRIERS-1:0]; // warps waiting on barrier
reg [`NUM_BARRIERS-1:0][`NUM_WARPS-1:0] barrier_stall_mask; // warps waiting on barrier
wire reached_barrier_limit; // the expected number of warps reached the barrier
// wspawn
reg [31:0] use_wspawn_pc;
reg [`NUM_WARPS-1:0] use_wspawn;
reg [`NW_BITS-1:0] scheduled_warp;
reg [`NW_BITS-1:0] schedule_warp;
wire warp_scheduled;
wire ifetch_req_fire = ifetch_req_if.valid && ifetch_req_if.ready;
wire ifetch_rsp_fire = ifetch_rsp_if.valid && ifetch_rsp_if.ready;
wire tmc_active = (warp_ctl_if.tmc.tmask != 0);
@ -67,7 +69,7 @@ module VX_warp_sched #(
schedule_table_n[warp_ctl_if.wid] = tmc_active;
end
if (warp_scheduled) begin // remove scheduled warp (round-robin)
schedule_table_n[scheduled_warp] = 0;
schedule_table_n[schedule_warp] = 0;
end
end
@ -115,9 +117,9 @@ module VX_warp_sched #(
end
end
if (use_wspawn[scheduled_warp] && warp_scheduled) begin
use_wspawn[scheduled_warp] <= 0;
thread_masks[scheduled_warp] <= 1;
if (use_wspawn[schedule_warp] && warp_scheduled) begin
use_wspawn[schedule_warp] <= 0;
thread_masks[schedule_warp] <= 1;
end
// Stalling the scheduling of warps
@ -135,11 +137,16 @@ module VX_warp_sched #(
// Lock warp until instruction decode to resolve branches
if (warp_scheduled) begin
fetch_lock[scheduled_warp] <= 1;
fetch_lock[schedule_warp] <= 1;
end
if (ifetch_req_fire) begin
warp_next_pcs[ifetch_req_if.wid] <= ifetch_req_if.PC + 4;
end
if (ifetch_rsp_fire) begin
fetch_lock[ifetch_rsp_if.wid] <= 0;
warp_pcs[ifetch_rsp_if.wid] <= ifetch_rsp_if.PC + 4;
warp_pcs[ifetch_rsp_if.wid] <= warp_next_pcs[ifetch_rsp_if.wid];
end
// join handling
@ -224,13 +231,13 @@ module VX_warp_sched #(
schedule_valid = 0;
thread_mask = 'x;
warp_pc = 'x;
scheduled_warp = 'x;
schedule_warp = 'x;
for (integer i = 0; i < `NUM_WARPS; ++i) begin
if (schedule_ready[i]) begin
schedule_valid = 1;
thread_mask = use_wspawn[i] ? `NUM_THREADS'(1) : thread_masks[i];
warp_pc = use_wspawn[i] ? use_wspawn_pc : warp_pcs[i];
scheduled_warp = `NW_BITS'(i);
schedule_warp = `NW_BITS'(i);
break;
end
end
@ -247,7 +254,7 @@ module VX_warp_sched #(
.clk (clk),
.reset (reset),
.enable (!stall_out),
.data_in ({warp_scheduled, thread_mask, warp_pc, scheduled_warp}),
.data_in ({schedule_valid, thread_mask, warp_pc, schedule_warp}),
.data_out ({ifetch_req_if.valid, ifetch_req_if.tmask, ifetch_req_if.PC, ifetch_req_if.wid})
);
@ -257,7 +264,7 @@ module VX_warp_sched #(
`SCOPE_ASSIGN (wsched_active_warps, active_warps);
`SCOPE_ASSIGN (wsched_schedule_table, schedule_table);
`SCOPE_ASSIGN (wsched_schedule_ready, schedule_ready);
`SCOPE_ASSIGN (wsched_warp_to_schedule, scheduled_warp);
`SCOPE_ASSIGN (wsched_warp_to_schedule, schedule_warp);
`SCOPE_ASSIGN (wsched_warp_pc, warp_pc);
endmodule

2
hw/rtl/interfaces/VX_fetch_to_csr_if.v
View file

@ -5,7 +5,7 @@
interface VX_fetch_to_csr_if ();
wire [`NUM_THREADS-1:0] thread_masks [`NUM_WARPS-1:0];
wire [`NUM_WARPS-1:0][`NUM_THREADS-1:0] thread_masks;
endinterface