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pipeline refactoring: centralized issue buffer

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This commit is contained in:
Blaise Tine
2020-07-26 11:21:08 -04:00
parent 1f63f9da25
commit 7c86b68977
62 changed files with 923 additions and 820 deletions
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57
hw/rtl/VX_fpu_unit.v
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@@ -14,7 +14,7 @@ module VX_fpu_unit #(
VX_fpu_from_csr_if fpu_from_csr_if,
// outputs
VX_commit_fp_if fpu_commit_if,
VX_commit_if fpu_commit_if,
VX_fpu_to_csr_if fpu_to_csr_if
);
localparam FOP_BITS = fpnew_pkg::OP_BITS;
@@ -98,6 +98,8 @@ module VX_fpu_unit #(
assign fpu_operands = {fpu_req_if.rs3_data, fpu_req_if.rs2_data, fpu_req_if.rs1_data};
`DISABLE_TRACING
fpnew_top #(
.Features (FPU_FEATURES),
.Implementation (FPU_IMPLEMENTATION),
@@ -125,47 +127,28 @@ module VX_fpu_unit #(
`UNUSED_PIN (busy_o)
);
wire req_push = fpu_req_if.valid && fpu_req_if.ready;
wire req_pop = fpu_out_valid && fpu_out_ready;
wire req_full;
`ENABLE_TRACING
wire [`NUM_THREADS-1:0] rsp_valid;
wire [`NW_BITS-1:0] rsp_warp_num;
wire [31:0] rsp_curr_PC;
wire rsp_wb;
wire [`NR_BITS-1:0] rsp_rd;
wire rsp_rd_is_fp;
reg [`NW_BITS-1:0] rsp_warp_num_buf [`ISSUEQ_SIZE];
VX_index_queue #(
.DATAW (`NUM_THREADS + `NW_BITS + 32 + 1 + `NR_BITS + 1),
.SIZE (`FPURQ_SIZE)
) fpu_req_queue (
.clk (clk),
.reset (reset),
.write_data ({fpu_req_if.valid, fpu_req_if.warp_num, fpu_req_if.curr_PC, fpu_req_if.wb, fpu_req_if.rd, fpu_req_if.rd_is_fp}),
.write_addr (fpu_in_tag),
.push (req_push),
.full (req_full),
.pop (req_pop),
.read_addr (fpu_out_tag),
.read_data ({rsp_valid, rsp_warp_num, rsp_curr_PC, rsp_wb, rsp_rd, rsp_rd_is_fp}),
`UNUSED_PIN (empty)
);
assign fpu_in_valid = fpu_req_if.valid;
assign fpu_in_tag = fpu_req_if.issue_tag;
assign fpu_in_valid = (| fpu_req_if.valid) && ~req_full;
assign fpu_req_if.ready = fpu_in_ready && ~req_full;
always @(posedge clk) begin
if (fpu_req_if.valid && fpu_req_if.ready) begin
rsp_warp_num_buf[fpu_in_tag] <= fpu_req_if.warp_num;
end
end
assign fpu_commit_if.valid = rsp_valid & {`NUM_THREADS{fpu_out_valid}};
assign fpu_commit_if.warp_num = rsp_warp_num;
assign fpu_commit_if.curr_PC = rsp_curr_PC;
assign fpu_commit_if.data = fpu_result;
assign fpu_commit_if.wb = rsp_wb;
assign fpu_commit_if.rd = rsp_rd;
assign fpu_commit_if.rd_is_fp = rsp_rd_is_fp;
assign fpu_out_ready = fpu_commit_if.ready;
assign fpu_req_if.ready = fpu_in_ready;
assign fpu_to_csr_if.valid = fpu_out_valid;
assign fpu_to_csr_if.warp_num = rsp_warp_num;
assign fpu_commit_if.valid = fpu_out_valid;
assign fpu_commit_if.issue_tag = fpu_out_tag;
assign fpu_commit_if.data = fpu_result;
assign fpu_out_ready = fpu_commit_if.ready;
assign fpu_to_csr_if.valid = fpu_out_valid && fpu_req_if.ready;
assign fpu_to_csr_if.warp_num = rsp_warp_num_buf[fpu_out_tag];
assign fpu_to_csr_if.fflags_NV = fpu_status.NV;
assign fpu_to_csr_if.fflags_DZ = fpu_status.DZ;
assign fpu_to_csr_if.fflags_OF = fpu_status.OF;