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minor optimization

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This commit is contained in:
Blaise Tine
2021-02-18 16:03:16 -08:00
parent 31b3e380dc
commit 143319d557
2 changed files with 50 additions and 38 deletions
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63
hw/rtl/VX_ibuffer.v
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@@ -15,14 +15,13 @@ module VX_ibuffer #(
);
localparam DATAW = `NUM_THREADS + 32 + `EX_BITS + `OP_BITS + `FRM_BITS + 1 + (`NR_BITS * 4) + 32 + 1 + 1 + `NUM_REGS;
localparam SIZE = `IBUF_SIZE;
localparam ADDRW = $clog2(SIZE);
localparam ADDRW = $clog2(SIZE+1);
localparam NWARPSW = $clog2(`NUM_WARPS+1);
reg [`NUM_WARPS-1:0][ADDRW-1:0] used_r;
reg [`NUM_WARPS-1:0] full_r, empty_r, sizeMany_r;
reg [`NUM_WARPS-1:0] full_r, empty_r, alm_empty_r;
wire [`NUM_WARPS-1:0] q_full, q_empty;
wire [`NUM_WARPS-1:0] q_sizeMany;
wire [`NUM_WARPS-1:0] q_full, q_empty, q_alm_empty;
wire [DATAW-1:0] q_data_in;
wire [`NUM_WARPS-1:0][DATAW-1:0] q_data_prev;
reg [`NUM_WARPS-1:0][DATAW-1:0] q_data_out;
@@ -35,10 +34,10 @@ module VX_ibuffer #(
wire writing = enq_fire && (i == ibuf_enq_if.wid);
wire reading = deq_fire && (i == ibuf_deq_if.wid);
wire is_slot0 = (0 == used_r[i]) || ((1 == used_r[i]) && reading);
wire is_slot0 = empty_r[i] || (alm_empty_r[i] && reading);
wire push = writing && !is_slot0;
wire pop = reading && sizeMany_r[i];
wire pop = reading && !alm_empty_r[i];
VX_fifo_queue #(
.DATAW (DATAW),
@@ -60,25 +59,25 @@ module VX_ibuffer #(
always @(posedge clk) begin
if (reset) begin
used_r[i] <= 0;
full_r[i] <= 0;
empty_r[i] <= 1;
sizeMany_r[i] <= 0;
used_r[i] <= 0;
full_r[i] <= 0;
empty_r[i] <= 1;
alm_empty_r[i] <= 1;
end else begin
if (writing) begin
if (!reading) begin
empty_r[i] <= 0;
if (used_r[i] == ADDRW'(SIZE-1))
full_r[i] <= 1;
if (used_r[i] == 1)
sizeMany_r[i] <= 1;
alm_empty_r[i] <= 0;
if (used_r[i] == ADDRW'(SIZE))
full_r[i] <= 1;
end
end else if (reading) begin
full_r[i] <= 0;
if (used_r[i] == ADDRW'(1))
empty_r[i] <= 1;
if (used_r[i] == ADDRW'(2))
sizeMany_r[i] <= 0;
alm_empty_r[i] <= 1;
end
used_r[i] <= used_r[i] + ADDRW'($signed(2'(writing) - 2'(reading)));
end
@@ -91,29 +90,29 @@ module VX_ibuffer #(
end
end
assign q_full[i] = full_r[i];
assign q_empty[i] = empty_r[i];
assign q_sizeMany[i] = sizeMany_r[i];
assign q_full[i] = full_r[i];
assign q_empty[i] = empty_r[i];
assign q_alm_empty[i] = alm_empty_r[i];
end
///////////////////////////////////////////////////////////////////////////
reg [`NUM_WARPS-1:0] valid_table, valid_table_n;
reg [`NUM_WARPS-1:0] schedule_table, schedule_table_n;
reg [NWARPSW-1:0] num_warps;
reg [`NW_BITS-1:0] deq_wid, deq_wid_n;
reg deq_valid, deq_valid_n;
reg [DATAW-1:0] deq_instr, deq_instr_n;
reg [NWARPSW-1:0] num_warps;
always @(*) begin
valid_table_n = valid_table;
if (deq_fire) begin
valid_table_n[deq_wid] = q_sizeMany[deq_wid];
valid_table_n[deq_wid] = !q_alm_empty[deq_wid];
end
if (enq_fire) begin
valid_table_n[ibuf_enq_if.wid] = 1;
end
end
end
// schedule the next instruction to issue
// do round-robin when multiple warps are active
@@ -121,19 +120,20 @@ module VX_ibuffer #(
deq_valid_n = 0;
deq_wid_n = 'x;
deq_instr_n = 'x;
schedule_table_n = schedule_table;
schedule_table_n = 'x;
if (0 == num_warps) begin
if ((0 == num_warps)
|| (1 == num_warps && deq_fire && q_alm_empty[deq_wid])) begin
deq_valid_n = enq_fire;
deq_wid_n = ibuf_enq_if.wid;
deq_instr_n = q_data_in;
end else if ((1 == num_warps) || freeze) begin
deq_valid_n = (!deq_fire || q_sizeMany[deq_wid]) || enq_fire;
deq_wid_n = (!deq_fire || q_sizeMany[deq_wid]) ? deq_wid : ibuf_enq_if.wid;
deq_instr_n = deq_fire ? (q_sizeMany[deq_wid] ? q_data_prev[deq_wid] : q_data_in) : q_data_out[deq_wid];
deq_valid_n = 1;
deq_wid_n = deq_wid;
deq_instr_n = deq_fire ? q_data_prev[deq_wid] : q_data_out[deq_wid];
end else begin
deq_valid_n = (| schedule_table);
schedule_table_n = schedule_table;
for (integer i = 0; i < `NUM_WARPS; i++) begin
if (schedule_table[i]) begin
deq_wid_n = `NW_BITS'(i);
@@ -146,7 +146,7 @@ module VX_ibuffer #(
end
wire warp_added = enq_fire && q_empty[ibuf_enq_if.wid];
wire warp_removed = deq_fire && ~(enq_fire && ibuf_enq_if.wid == deq_wid) && ~q_sizeMany[deq_wid];
wire warp_removed = deq_fire && ~(enq_fire && ibuf_enq_if.wid == deq_wid) && q_alm_empty[deq_wid];
always @(posedge clk) begin
if (reset) begin
@@ -157,11 +157,12 @@ module VX_ibuffer #(
end else begin
valid_table <= valid_table_n;
if ((| schedule_table_n)) begin
schedule_table <= schedule_table_n;
end else begin
if (0 == (| schedule_table_n)
|| (num_warps < 2)) begin
schedule_table <= valid_table_n;
schedule_table[deq_wid_n] <= 0;
schedule_table[deq_wid_n] <= 0;
end else begin
schedule_table <= schedule_table_n;
end
deq_valid <= deq_valid_n;