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fixed FPU handshake, optimized writeback's critical path

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This commit is contained in:
Blaise Tine
2020-08-07 10:11:54 -07:00
parent ffd9515881
commit cd29362d10
26 changed files with 212 additions and 2368 deletions
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164
hw/rtl/VX_writeback.v
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@@ -18,113 +18,131 @@ module VX_writeback #(
// outputs
VX_wb_if writeback_if
);
reg [`ISSUEQ_SIZE-1:0] wb_valid_table, wb_valid_table_n;
reg [`ISSUEQ_SIZE-1:0][`NUM_THREADS-1:0][31:0] wb_data_table, wb_data_table_n;
reg [`ISSUEQ_SIZE-1:0][`NW_BITS-1:0] wb_warp_num_table, wb_warp_num_table_n;
reg [`ISSUEQ_SIZE-1:0][`NUM_THREADS-1:0] wb_thread_mask_table, wb_thread_mask_table_n;
reg [`ISSUEQ_SIZE-1:0][31:0] wb_curr_PC_table, wb_curr_PC_table_n;
reg [`ISSUEQ_SIZE-1:0][`NR_BITS-1:0] wb_rd_table, wb_rd_table_n;
reg [`NUM_THREADS-1:0][31:0] wb_data_table [`ISSUEQ_SIZE-1:0];
reg [`NW_BITS-1:0] wb_warp_num_table [`ISSUEQ_SIZE-1:0];
reg [`NUM_THREADS-1:0] wb_thread_mask_table [`ISSUEQ_SIZE-1:0];
reg [31:0] wb_curr_PC_table [`ISSUEQ_SIZE-1:0];
reg [`NR_BITS-1:0] wb_rd_table [`ISSUEQ_SIZE-1:0];
reg [`NUM_THREADS-1:0][31:0] wb_data, wb_data_n;
reg [`NW_BITS-1:0] wb_warp_num, wb_warp_num_n;
reg [`NUM_THREADS-1:0] wb_thread_mask, wb_thread_mask_n;
reg [31:0] wb_curr_PC, wb_curr_PC_n;
reg [`NR_BITS-1:0] wb_rd, wb_rd_n;
reg [`ISSUEQ_SIZE-1:0] wb_valid_table;
reg [`ISSUEQ_SIZE-1:0] wb_valid_table_n;
reg [`ISTAG_BITS-1:0] wb_index;
wire [`ISTAG_BITS-1:0] wb_index_n;
reg [`ISTAG_BITS-1:0] wb_index;
reg [`ISTAG_BITS-1:0] wb_index_n;
reg wb_valid;
wire wb_valid_n;
reg wb_valid_n;
always @(*) begin
wb_valid_table_n = wb_valid_table;
wb_valid_table_n = wb_valid_table;
wb_warp_num_table_n = wb_warp_num_table;
wb_thread_mask_table_n = wb_thread_mask_table;
wb_curr_PC_table_n = wb_curr_PC_table;
wb_rd_table_n = wb_rd_table;
wb_data_table_n = wb_data_table;
if (wb_valid) begin
wb_valid_table_n[wb_index] = 0;
end
if (alu_commit_if.valid) begin
wb_valid_table_n [alu_commit_if.issue_tag] = cmt_to_issue_if.alu_data.wb;
wb_valid_table_n [alu_commit_if.issue_tag] = cmt_to_issue_if.alu_data.wb;
wb_thread_mask_table_n [alu_commit_if.issue_tag] = cmt_to_issue_if.alu_data.thread_mask;
wb_data_table_n [alu_commit_if.issue_tag] = alu_commit_if.data;
wb_warp_num_table_n [alu_commit_if.issue_tag] = cmt_to_issue_if.alu_data.warp_num;
wb_curr_PC_table_n [alu_commit_if.issue_tag] = cmt_to_issue_if.alu_data.curr_PC;
wb_rd_table_n [alu_commit_if.issue_tag] = cmt_to_issue_if.alu_data.rd;
end
if (lsu_commit_if.valid) begin
wb_valid_table_n [lsu_commit_if.issue_tag] = cmt_to_issue_if.lsu_data.wb;
wb_valid_table_n [lsu_commit_if.issue_tag] = cmt_to_issue_if.lsu_data.wb;
wb_thread_mask_table_n [lsu_commit_if.issue_tag] = cmt_to_issue_if.lsu_data.thread_mask;
wb_data_table_n [lsu_commit_if.issue_tag] = lsu_commit_if.data;
wb_warp_num_table_n [lsu_commit_if.issue_tag] = cmt_to_issue_if.lsu_data.warp_num;
wb_curr_PC_table_n [lsu_commit_if.issue_tag] = cmt_to_issue_if.lsu_data.curr_PC;
wb_rd_table_n [lsu_commit_if.issue_tag] = cmt_to_issue_if.lsu_data.rd;
end
if (csr_commit_if.valid) begin
wb_valid_table_n [csr_commit_if.issue_tag] = cmt_to_issue_if.csr_data.wb;
wb_valid_table_n [csr_commit_if.issue_tag] = cmt_to_issue_if.csr_data.wb;
wb_thread_mask_table_n [csr_commit_if.issue_tag] = cmt_to_issue_if.csr_data.thread_mask;
wb_data_table_n [csr_commit_if.issue_tag] = csr_commit_if.data;
wb_warp_num_table_n [csr_commit_if.issue_tag] = cmt_to_issue_if.csr_data.warp_num;
wb_curr_PC_table_n [csr_commit_if.issue_tag] = cmt_to_issue_if.csr_data.curr_PC;
wb_rd_table_n [csr_commit_if.issue_tag] = cmt_to_issue_if.csr_data.rd;
end
if (mul_commit_if.valid) begin
wb_valid_table_n [mul_commit_if.issue_tag] = cmt_to_issue_if.mul_data.wb;
wb_valid_table_n [mul_commit_if.issue_tag] = cmt_to_issue_if.mul_data.wb;
wb_thread_mask_table_n [mul_commit_if.issue_tag] = cmt_to_issue_if.mul_data.thread_mask;
wb_data_table_n [mul_commit_if.issue_tag] = mul_commit_if.data;
wb_warp_num_table_n [mul_commit_if.issue_tag] = cmt_to_issue_if.mul_data.warp_num;
wb_curr_PC_table_n [mul_commit_if.issue_tag] = cmt_to_issue_if.mul_data.curr_PC;
wb_rd_table_n [mul_commit_if.issue_tag] = cmt_to_issue_if.mul_data.rd;
end
if (fpu_commit_if.valid) begin
wb_valid_table_n [fpu_commit_if.issue_tag] = cmt_to_issue_if.fpu_data.wb;
wb_valid_table_n [fpu_commit_if.issue_tag] = cmt_to_issue_if.fpu_data.wb;
wb_thread_mask_table_n [fpu_commit_if.issue_tag] = cmt_to_issue_if.fpu_data.thread_mask;
wb_data_table_n [fpu_commit_if.issue_tag] = fpu_commit_if.data;
wb_warp_num_table_n [fpu_commit_if.issue_tag] = cmt_to_issue_if.fpu_data.warp_num;
wb_curr_PC_table_n [fpu_commit_if.issue_tag] = cmt_to_issue_if.fpu_data.curr_PC;
wb_rd_table_n [fpu_commit_if.issue_tag] = cmt_to_issue_if.fpu_data.rd;
end
end
VX_priority_encoder #(
.N(`ISSUEQ_SIZE)
) wb_select (
.data_in (wb_valid_table_n),
.data_out (wb_index_n),
.valid_out (wb_valid_n)
);
integer i;
always @(*) begin
wb_index_n = 0;
wb_valid_n = 0;
for (i = `ISSUEQ_SIZE-1; i >= 0; i--) begin
if (wb_valid_table_n[i]) begin
wb_index_n = `ISTAG_BITS'(i);
wb_valid_n = 1;
wb_thread_mask_n= wb_thread_mask_table_n[i];
wb_warp_num_n = wb_warp_num_table_n[i];
wb_curr_PC_n = wb_curr_PC_table_n[i];
wb_rd_n = wb_rd_table_n[i];
wb_data_n = wb_data_table_n[i];
end
end
end
always @(posedge clk) begin
if (reset) begin
wb_valid_table <= 0;
wb_index <= 0;
wb_valid <= 0;
wb_index <= 0;
wb_valid <= 0;
end else begin
if (alu_commit_if.valid) begin
wb_data_table [alu_commit_if.issue_tag] <= alu_commit_if.data;
wb_warp_num_table [alu_commit_if.issue_tag] <= cmt_to_issue_if.alu_data.warp_num;
wb_thread_mask_table [alu_commit_if.issue_tag] <= cmt_to_issue_if.alu_data.thread_mask;
wb_curr_PC_table [alu_commit_if.issue_tag] <= cmt_to_issue_if.alu_data.curr_PC;
wb_rd_table [alu_commit_if.issue_tag] <= cmt_to_issue_if.alu_data.rd;
end
if (lsu_commit_if.valid) begin
wb_data_table [lsu_commit_if.issue_tag] <= lsu_commit_if.data;
wb_warp_num_table [lsu_commit_if.issue_tag] <= cmt_to_issue_if.lsu_data.warp_num;
wb_thread_mask_table [lsu_commit_if.issue_tag] <= cmt_to_issue_if.lsu_data.thread_mask;
wb_curr_PC_table [lsu_commit_if.issue_tag] <= cmt_to_issue_if.lsu_data.curr_PC;
wb_rd_table [lsu_commit_if.issue_tag] <= cmt_to_issue_if.lsu_data.rd;
end
if (csr_commit_if.valid) begin
wb_data_table [csr_commit_if.issue_tag] <= csr_commit_if.data;
wb_warp_num_table [csr_commit_if.issue_tag] <= cmt_to_issue_if.csr_data.warp_num;
wb_thread_mask_table [csr_commit_if.issue_tag] <= cmt_to_issue_if.csr_data.thread_mask;
wb_curr_PC_table [csr_commit_if.issue_tag] <= cmt_to_issue_if.csr_data.curr_PC;
wb_rd_table [csr_commit_if.issue_tag] <= cmt_to_issue_if.csr_data.rd;
end
if (mul_commit_if.valid) begin
wb_data_table [mul_commit_if.issue_tag] <= mul_commit_if.data;
wb_warp_num_table [mul_commit_if.issue_tag] <= cmt_to_issue_if.mul_data.warp_num;
wb_thread_mask_table [mul_commit_if.issue_tag] <= cmt_to_issue_if.mul_data.thread_mask;
wb_curr_PC_table [mul_commit_if.issue_tag] <= cmt_to_issue_if.mul_data.curr_PC;
wb_rd_table [mul_commit_if.issue_tag] <= cmt_to_issue_if.mul_data.rd;
end
wb_valid_table <= wb_valid_table_n;
wb_thread_mask_table <= wb_thread_mask_table_n;
wb_warp_num_table <= wb_warp_num_table_n;
wb_curr_PC_table <= wb_curr_PC_table_n;
wb_rd_table <= wb_rd_table_n;
wb_data_table <= wb_data_table_n;
if (fpu_commit_if.valid) begin
wb_data_table [fpu_commit_if.issue_tag] <= fpu_commit_if.data;
wb_warp_num_table [fpu_commit_if.issue_tag] <= cmt_to_issue_if.fpu_data.warp_num;
wb_thread_mask_table [fpu_commit_if.issue_tag] <= cmt_to_issue_if.fpu_data.thread_mask;
wb_curr_PC_table [fpu_commit_if.issue_tag] <= cmt_to_issue_if.fpu_data.curr_PC;
wb_rd_table [fpu_commit_if.issue_tag] <= cmt_to_issue_if.fpu_data.rd;
end
wb_valid_table <= wb_valid_table_n;
wb_index <= wb_index_n;
wb_valid <= wb_valid_n && writeback_if.ready;
wb_index <= wb_index_n;
wb_valid <= wb_valid_n && writeback_if.ready;
wb_thread_mask <= wb_thread_mask_n;
wb_warp_num <= wb_warp_num_n;
wb_curr_PC <= wb_curr_PC_n;
wb_rd <= wb_rd_n;
wb_data <= wb_data_n;
end
end
// writeback request
assign writeback_if.valid = wb_valid;
assign writeback_if.warp_num = wb_warp_num_table [wb_index];
assign writeback_if.thread_mask = wb_thread_mask_table [wb_index];
assign writeback_if.curr_PC = wb_curr_PC_table [wb_index];
assign writeback_if.rd = wb_rd_table [wb_index];
assign writeback_if.data = wb_data_table [wb_index];
assign writeback_if.thread_mask = wb_thread_mask;
assign writeback_if.warp_num = wb_warp_num;
assign writeback_if.curr_PC = wb_curr_PC;
assign writeback_if.rd = wb_rd;
assign writeback_if.data = wb_data;
// commit back-pressure
assign alu_commit_if.ready = 1'b1;