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lsu_unit refactoring to reduce critical path

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This commit is contained in:
Blaise Tine
2020-07-10 11:23:34 -07:00
parent bca36e213e
commit 77c3b2d45f
9 changed files with 124 additions and 123 deletions
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39
hw/rtl/VX_exec_unit.v
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@@ -15,18 +15,18 @@ module VX_exec_unit (
output wire delay
);
wire[`NUM_THREADS-1:0][31:0] in_a_reg_data;
wire[`NUM_THREADS-1:0][31:0] in_b_reg_data;
wire[4:0] in_alu_op;
wire in_rs2_src;
wire[31:0] in_itype_immed;
wire [`NUM_THREADS-1:0][31:0] in_a_reg_data;
wire [`NUM_THREADS-1:0][31:0] in_b_reg_data;
wire [4:0] in_alu_op;
wire in_rs2_src;
wire [31:0] in_itype_immed;
`DEBUG_BEGIN
wire[2:0] in_branch_type;
wire [2:0] in_branch_type;
`DEBUG_END
wire[19:0] in_upper_immed;
wire in_jal;
wire[31:0] in_jal_offset;
wire[31:0] in_curr_PC;
wire [19:0] in_upper_immed;
wire in_jal;
wire [31:0] in_jal_offset;
wire [31:0] in_curr_PC;
assign in_a_reg_data = exec_unit_req_if.a_reg_data;
assign in_b_reg_data = exec_unit_req_if.b_reg_data;
@@ -39,12 +39,12 @@ module VX_exec_unit (
assign in_jal_offset = exec_unit_req_if.jal_offset;
assign in_curr_PC = exec_unit_req_if.curr_PC;
wire[`NUM_THREADS-1:0][31:0] alu_result;
wire[`NUM_THREADS-1:0] alu_stall;
wire [`NUM_THREADS-1:0][31:0] alu_result;
wire [`NUM_THREADS-1:0] alu_stall;
genvar i;
generate
for (i = 0; i < `NUM_THREADS; i++) begin : alu_defs
for (i = 0; i < `NUM_THREADS; i++) begin
VX_alu_unit alu_unit (
.clk (clk),
.reset (reset),
@@ -65,20 +65,17 @@ module VX_exec_unit (
assign delay = no_slot_exec || internal_stall;
`DEBUG_BEGIN
wire [$clog2(`NUM_THREADS)-1:0] jal_branch_use_index;
wire jal_branch_found_valid;
`DEBUG_END
VX_priority_encoder #(
.N(`NUM_THREADS)
) choose_alu_result (
.data_in (exec_unit_req_if.valid),
.data_out (jal_branch_use_index),
.valid_out (jal_branch_found_valid)
.data_in (exec_unit_req_if.valid),
.data_out (jal_branch_use_index),
`UNUSED_PIN (valid_out)
);
wire[31:0] branch_use_alu_result = alu_result[jal_branch_use_index];
wire [31:0] branch_use_alu_result = alu_result[jal_branch_use_index];
reg temp_branch_dir;
always @(*)
@@ -95,7 +92,7 @@ module VX_exec_unit (
endcase // in_branch_type
end
wire[`NUM_THREADS-1:0][31:0] duplicate_PC_data;
wire [`NUM_THREADS-1:0][31:0] duplicate_PC_data;
generate
for (i = 0; i < `NUM_THREADS; i++) begin