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scoreboard arbiter optimization

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This commit is contained in:
Blaise Tine 2024-07-09 14:22:08 -07:00
parent 2651632884
commit ed0c1a778f
1 changed files with 6 additions and 7 deletions
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13
hw/rtl/core/VX_scoreboard.sv
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@ -96,7 +96,7 @@ module VX_scoreboard import VX_gpu_pkg::*; #(
`endif
VX_ibuffer_if staging_if [PER_ISSUE_WARPS]();
wire [PER_ISSUE_WARPS-1:0][3:0] staging_opds_busy;
reg [PER_ISSUE_WARPS-1:0] operands_ready;
for (genvar i = 0; i < PER_ISSUE_WARPS; ++i) begin
VX_elastic_buffer #(
@ -241,6 +241,7 @@ module VX_scoreboard import VX_gpu_pkg::*; #(
end
end
operands_busy <= operands_busy_n;
operands_ready[i] <= ~(| operands_busy_n);
`ifdef PERF_ENABLE
if (staging_fire && staging_if[i].data.wb) begin
inuse_units[staging_if[i].data.rd] <= staging_if[i].data.ex_type;
@ -251,8 +252,6 @@ module VX_scoreboard import VX_gpu_pkg::*; #(
`endif
end
assign staging_opds_busy[i] = operands_busy;
`ifdef SIMULATION
reg [31:0] timeout_ctr;
@ -290,10 +289,9 @@ module VX_scoreboard import VX_gpu_pkg::*; #(
wire [PER_ISSUE_WARPS-1:0] arb_ready_in;
for (genvar i = 0; i < PER_ISSUE_WARPS; ++i) begin
wire operands_ready = ~(| staging_opds_busy[i]);
assign arb_valid_in[i] = staging_if[i].valid && operands_ready;
assign arb_valid_in[i] = staging_if[i].valid && operands_ready[i];
assign arb_data_in[i] = staging_if[i].data;
assign staging_if[i].ready = arb_ready_in[i] && operands_ready;
assign staging_if[i].ready = arb_ready_in[i] && operands_ready[i];
end
`RESET_RELAY (arb_reset, reset);
@ -302,7 +300,8 @@ module VX_scoreboard import VX_gpu_pkg::*; #(
.NUM_INPUTS (PER_ISSUE_WARPS),
.DATAW (DATAW),
.ARBITER ("R"),
.OUT_BUF (2)
.LUTRAM (1),
.OUT_BUF (4) // using 2-cycle EB for area reduction
) out_arb (
.clk (clk),
.reset (arb_reset),