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multiplier unit optimization - using fifo for metadata, shift register optimization

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This commit is contained in:
Blaise Tine
2020-12-26 11:23:21 -08:00
parent b459192dec
commit 33c431ed44
13 changed files with 171 additions and 76 deletions
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110
hw/rtl/VX_mul_unit.v
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@@ -19,47 +19,43 @@ module VX_mul_unit #(
wire [`NUM_THREADS-1:0][31:0] alu_in1 = mul_req_if.rs1_data;
wire [`NUM_THREADS-1:0][31:0] alu_in2 = mul_req_if.rs2_data;
wire [`NW_BITS-1:0] rsp_wid;
wire [`NUM_THREADS-1:0] rsp_tmask;
wire [31:0] rsp_PC;
wire [`NR_BITS-1:0] rsp_rd;
wire rsp_wb;
wire [MULQ_BITS-1:0] tag_in, tag_out;
wire valid_out, ready_out;
wire mulq_full;
wire mulq_push = mul_req_if.valid && mul_req_if.ready;
wire mulq_pop = valid_out && ready_out;
VX_index_buffer #(
.DATAW (`NW_BITS + `NUM_THREADS + 32 + `NR_BITS + 1),
.SIZE (`MULQ_SIZE),
.FASTRAM (1)
) req_metadata_buf (
.clk (clk),
.reset (reset),
.acquire_slot (mulq_push),
.write_addr (tag_in),
.read_addr (tag_out),
.release_addr (tag_out),
.write_data ({mul_req_if.wid, mul_req_if.tmask, mul_req_if.PC, mul_req_if.rd, mul_req_if.wb}),
.read_data ({rsp_wid, rsp_tmask, rsp_PC, rsp_rd, rsp_wb}),
.release_slot (mulq_pop),
.full (mulq_full)
);
wire valid_in = mul_req_if.valid && ~mulq_full;
wire ready_out;
///////////////////////////////////////////////////////////////////////////
wire [`NUM_THREADS-1:0][31:0] mul_result;
wire [MULQ_BITS-1:0] mul_tag;
wire is_mul_in = (alu_op == `MUL_MUL);
wire is_mul_out;
wire [`NW_BITS-1:0] mul_wid_out;
wire [`NUM_THREADS-1:0] mul_tmask_out;
wire [31:0] mul_PC_out;
wire [`NR_BITS-1:0] mul_rd_out;
wire mul_wb_out;
wire mul_valid_out;
wire mul_valid_in = valid_in && !is_div_op;
wire mul_valid_in = mul_req_if.valid && !is_div_op && ~mulq_full;
wire mul_ready_in = ready_out || ~mul_valid_out;
wire mulq_push = mul_valid_in && mul_ready_in;
wire mulq_pop = mul_valid_out && ready_out;
wire mulq_full;
wire is_mulh_in = (alu_op != `MUL_MUL);
wire is_mulh_out;
VX_generic_queue #(
.DATAW (`NW_BITS + `NUM_THREADS + 32 + `NR_BITS + 1 + 1),
.SIZE (`MULQ_SIZE),
.FASTRAM (1)
) mul_metadata (
.clk (clk),
.reset (reset),
.push (mulq_push),
.pop (mulq_pop),
.data_in ({mul_req_if.wid, mul_req_if.tmask, mul_req_if.PC, mul_req_if.rd, mul_req_if.wb, is_mulh_in}),
.data_out ({mul_wid_out, mul_tmask_out, mul_PC_out, mul_rd_out, mul_wb_out, is_mulh_out}),
.full (mulq_full),
`UNUSED_PIN (empty),
`UNUSED_PIN (size)
);
for (genvar i = 0; i < `NUM_THREADS; i++) begin
@@ -83,32 +79,36 @@ module VX_mul_unit #(
.result(mul_result_tmp)
);
assign mul_result[i] = is_mul_out ? mul_result_tmp[31:0] : mul_result_tmp[63:32];
assign mul_result[i] = is_mulh_out ? mul_result_tmp[63:32] : mul_result_tmp[31:0];
end
VX_shift_register #(
.DATAW(1 + MULQ_BITS + 1),
.DATAW(1),
.DEPTH(`LATENCY_IMUL)
) mul_shift_reg (
.clk(clk),
.reset(reset),
.enable(mul_ready_in),
.in({mul_valid_in, tag_in, is_mul_in}),
.out({mul_valid_out, mul_tag, is_mul_out})
.data_in(mul_valid_in),
.data_out(mul_valid_out)
);
///////////////////////////////////////////////////////////////////////////
wire [`NUM_THREADS-1:0][31:0] div_result_tmp, rem_result_tmp;
wire [`NUM_THREADS-1:0][31:0] div_result_tmp, rem_result_tmp;
wire [`NW_BITS-1:0] div_wid_out;
wire [`NUM_THREADS-1:0] div_tmask_out;
wire [31:0] div_PC_out;
wire [`NR_BITS-1:0] div_rd_out;
wire div_wb_out;
wire is_rem_op = (alu_op == `MUL_REM) || (alu_op == `MUL_REMU);
wire is_rem_op_in = (alu_op == `MUL_REM) || (alu_op == `MUL_REMU);
wire is_signed_div = (alu_op == `MUL_DIV) || (alu_op == `MUL_REM);
wire div_valid_in = valid_in && is_div_op;
wire div_valid_in = mul_req_if.valid && is_div_op;
wire div_ready_out = ready_out && ~mul_valid_out; // arbitration prioritizes MUL
wire div_ready_in;
wire div_valid_out;
wire is_rem_op_out;
wire [MULQ_BITS-1:0] div_tag;
VX_serial_div #(
.WIDTHN(32),
@@ -116,21 +116,21 @@ module VX_mul_unit #(
.WIDTHQ(32),
.WIDTHR(32),
.LANES(`NUM_THREADS),
.TAGW(MULQ_BITS + 1)
.TAGW(`NW_BITS + `NUM_THREADS + 32 + `NR_BITS + 1 + 1)
) divide (
.clk(clk),
.reset(reset),
.ready_in(div_ready_in),
.reset(reset),
.valid_in(div_valid_in),
.ready_in(div_ready_in),
.signed_mode(is_signed_div),
.tag_in({tag_in, is_rem_op}),
.tag_in({mul_req_if.wid, mul_req_if.tmask, mul_req_if.PC, mul_req_if.rd, mul_req_if.wb, is_rem_op_in}),
.numer(alu_in1),
.denom(alu_in2),
.quotient(div_result_tmp),
.remainder(rem_result_tmp),
.ready_out(div_ready_out),
.valid_out(div_valid_out),
.tag_out({div_tag, is_rem_op_out})
.tag_out({div_wid_out, div_tmask_out, div_PC_out, div_rd_out, div_wb_out, is_rem_op_out})
);
wire [`NUM_THREADS-1:0][31:0] div_result = is_rem_op_out ? rem_result_tmp : div_result_tmp;
@@ -140,9 +140,13 @@ module VX_mul_unit #(
wire stall_out = ~mul_commit_if.ready && mul_commit_if.valid;
assign ready_out = ~stall_out;
assign valid_out = mul_valid_out || div_valid_out;
assign tag_out = mul_valid_out ? mul_tag : div_tag;
wire [`NUM_THREADS-1:0][31:0] result = mul_valid_out ? mul_result : div_result;
wire rsp_valid = mul_valid_out || div_valid_out;
wire [`NW_BITS-1:0] rsp_wid = mul_valid_out ? mul_wid_out : div_wid_out;
wire [`NUM_THREADS-1:0] rsp_tmask = mul_valid_out ? mul_tmask_out : div_tmask_out;
wire [31:0] rsp_PC = mul_valid_out ? mul_PC_out : div_PC_out;
wire [`NR_BITS-1:0] rsp_rd = mul_valid_out ? mul_rd_out : div_rd_out;
wire rsp_wb = mul_valid_out ? mul_wb_out : div_wb_out;
wire [`NUM_THREADS-1:0][31:0] rsp_data = mul_valid_out ? mul_result : div_result;
VX_generic_register #(
.N(1 + `NW_BITS + `NUM_THREADS + 32 + `NR_BITS + 1 + (`NUM_THREADS * 32)),
@@ -152,11 +156,11 @@ module VX_mul_unit #(
.reset (reset),
.stall (stall_out),
.flush (1'b0),
.data_in ({valid_out, rsp_wid, rsp_tmask, rsp_PC, rsp_rd, rsp_wb, result}),
.data_in ({rsp_valid, rsp_wid, rsp_tmask, rsp_PC, rsp_rd, rsp_wb, rsp_data}),
.data_out ({mul_commit_if.valid, mul_commit_if.wid, mul_commit_if.tmask, mul_commit_if.PC, mul_commit_if.rd, mul_commit_if.wb, mul_commit_if.data})
);
// can accept new request?
assign mul_req_if.ready = (is_div_op ? div_ready_in : mul_ready_in) && ~mulq_full;
assign mul_req_if.ready = is_div_op ? div_ready_in : (mul_ready_in && ~mulq_full);
endmodule