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critical path optimizations

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This commit is contained in:
Blaise Tine
2021-06-23 01:51:23 -07:00
parent b8fd2308e1
commit a3a7239b4d
4 changed files with 287 additions and 60 deletions
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37
hw/rtl/VX_ibuffer.v
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@@ -97,6 +97,7 @@ module VX_ibuffer #(
reg [DATAW-1:0] deq_instr, deq_instr_n;
reg [NWARPSW-1:0] num_warps;
// calculate valid table
always @(*) begin
valid_table_n = valid_table;
if (deq_fire) begin
@@ -113,11 +114,10 @@ module VX_ibuffer #(
deq_valid_n = 1;
deq_wid_n = 'x;
deq_instr_n = 'x;
for (integer i = 0; i < `NUM_WARPS; i++) begin
for (integer i = `NUM_WARPS-1; i >= 0; --i) begin
if (schedule_table[i]) begin
deq_wid_n = `NW_BITS'(i);
deq_wid_n = `NW_BITS'(i);
deq_instr_n = q_data_out[i];
break;
end
end
end else if (1 == num_warps && !(deq_fire && q_alm_empty[deq_wid])) begin
@@ -130,16 +130,16 @@ module VX_ibuffer #(
deq_instr_n = q_data_in;
end
end
// do round-robin with multiple active warps
// do round-robin scheduling with multiple active warps
always @(*) begin
schedule_table_n = schedule_table;
for (integer i = 0; i < `NUM_WARPS; i++) begin
if (schedule_table[i]) begin
schedule_table_n[i] = 0;
break;
end
if (1 == $countones(schedule_table)
|| (num_warps < 2)) begin
schedule_table_n = valid_table_n;
end else begin
schedule_table_n = schedule_table;
end
schedule_table_n[deq_wid_n] = 0;
end
wire warp_added = enq_fire && q_empty[ibuf_enq_if.wid];
@@ -148,21 +148,12 @@ module VX_ibuffer #(
always @(posedge clk) begin
if (reset) begin
valid_table <= 0;
schedule_table <= 0;
deq_valid <= 0;
num_warps <= 0;
end else begin
valid_table <= valid_table_n;
if (0 == (| schedule_table_n)
|| (num_warps < 2)) begin
schedule_table <= valid_table_n;
schedule_table[deq_wid_n] <= 0;
end else begin
schedule_table <= schedule_table_n;
end
deq_valid <= deq_valid_n;
valid_table <= valid_table_n;
deq_valid <= deq_valid_n;
schedule_table <= schedule_table_n;
if (warp_added && !warp_removed) begin
num_warps <= num_warps + NWARPSW'(1);