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optimize warp_sched

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This commit is contained in:
Blaise Tine
2020-08-24 05:36:00 -07:00
parent 9e2d430239
commit df25bae456
6 changed files with 19 additions and 50 deletions
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30
hw/rtl/VX_warp_sched.v
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@@ -52,10 +52,7 @@ module VX_warp_sched #(
&& warp_ctl_if.tmc.valid
&& (0 == warp_ctl_if.tmc.thread_mask)) begin
schedule_table_n[warp_ctl_if.wid] = 0;
end
if (wstall_if.wstall) begin
schedule_table_n[wstall_if.wid] = 0;
end
end
if (scheduled_warp) begin // remove scheduled warp (round-robin)
schedule_table_n[warp_to_schedule] = 0;
end
@@ -103,7 +100,7 @@ module VX_warp_sched #(
if (0 == warp_ctl_if.tmc.thread_mask) begin
active_warps[warp_ctl_if.wid] <= 0;
end
end else if (join_if.is_join && !didnt_split) begin
end else if (join_if.valid && !didnt_split) begin
if (!join_fall) begin
warp_pcs[join_if.wid] <= join_pc;
end
@@ -125,15 +122,10 @@ module VX_warp_sched #(
end
// Stalling the scheduling of warps
if (wstall_if.wstall) begin
if (wstall_if.valid) begin
stalled_warps[wstall_if.wid] <= 1;
end
// Advance PC
if (scheduled_warp) begin
warp_pcs[warp_to_schedule] <= warp_pc + 4;
end
// Branch
if (branch_ctl_if.valid) begin
if (branch_ctl_if.taken) begin
@@ -148,6 +140,7 @@ module VX_warp_sched #(
end
if (ifetch_rsp_fire) begin
fetch_lock[ifetch_rsp_if.wid] <= 0;
warp_pcs[ifetch_rsp_if.wid] <= ifetch_rsp_if.curr_PC + 4;
end
// reset 'schedule_table' when it goes to zero
@@ -191,8 +184,7 @@ module VX_warp_sched #(
&& warp_ctl_if.split.diverged
&& (i == warp_ctl_if.wid);
wire pop = join_if.is_join
&& (i == join_if.wid);
wire pop = join_if.valid && (i == join_if.wid);
VX_ipdom_stack #(
.WIDTH(1+32+`NUM_THREADS),
@@ -232,17 +224,9 @@ module VX_warp_sched #(
end
end
wire stall_out = ~ifetch_req_if.ready && ifetch_req_if.valid;
wire branch_hazard = branch_ctl_if.valid
&& branch_ctl_if.taken
&& (branch_ctl_if.wid == warp_to_schedule);
wire stall_out = ~ifetch_req_if.ready && ifetch_req_if.valid;
wire wstall_this_cycle = wstall_if.wstall && (wstall_if.wid == warp_to_schedule);
wire stall = stall_out || wstall_this_cycle || branch_hazard || join_if.is_join;
assign scheduled_warp = schedule_valid && ~stall;
assign scheduled_warp = schedule_valid && ~stall_out;
VX_generic_register #(
.N(1 + `NUM_THREADS + 32 + `NW_BITS)