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synchronous reset network optimization: only reset register when required

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This commit is contained in:
Blaise Tine
2020-11-11 20:54:54 -08:00
parent ce95c40aee
commit fceb561cbd
8 changed files with 11 additions and 20 deletions
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2
hw/rtl/VX_gpr_bypass.v
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@@ -36,8 +36,6 @@ module VX_gpr_bypass #(
delayed_push <= 0;
use_buffer <= 0;
use_buffer2 <= 0;
buffer <= 0;
buffer2 <= 0;
end else begin
delayed_push <= push;
assert(!use_buffer2 || use_buffer);

3
hw/rtl/VX_gpr_stage.v
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@@ -61,8 +61,7 @@ module VX_gpr_stage #(
wire read_fire = gpr_req_if.valid && gpr_rsp_if.ready;
always @(posedge clk) begin
if (reset) begin
rs3_data <= 0;
if (reset) begin
read_rs3 <= 0;
end else begin
if (rs3_delay) begin

2
hw/rtl/VX_ibuffer.v
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@@ -20,7 +20,7 @@ module VX_ibuffer #(
localparam ADDRW = $clog2(SIZE);
localparam NWARPSW = $clog2(`NUM_WARPS+1);
reg [SIZEW-1:0] size_r [`NUM_WARPS-1:0];
reg [`NUM_WARPS-1:0][SIZEW-1:0] size_r;
wire [`NUM_WARPS-1:0] q_full;
wire [`NUM_WARPS-1:0][SIZEW-1:0] q_size;

16
hw/rtl/VX_instr_demux.v
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@@ -42,9 +42,9 @@ module VX_instr_demux (
.reset (reset),
.ready_in (alu_req_ready),
.valid_in (alu_req_valid),
.inst_in ({execute_if.wid, execute_if.tmask, execute_if.PC, next_PC, `ALU_BR_OP(execute_if.op_type), is_br_op, execute_if.imm, execute_if.rs1_is_PC, execute_if.rs2_is_imm, execute_if.rd, execute_if.wb, tid}),
.inst_in ({execute_if.wid, execute_if.tmask, execute_if.PC, next_PC, `ALU_BR_OP(execute_if.op_type), is_br_op, execute_if.imm, execute_if.rs1_is_PC, execute_if.rs2_is_imm, execute_if.rd, execute_if.wb, tid}),
.opds_in ({gpr_rsp_if.rs1_data, gpr_rsp_if.rs2_data}),
.data_out ({alu_req_if.wid, alu_req_if.tmask, alu_req_if.PC, alu_req_if.next_PC, alu_req_if.op_type, alu_req_if.is_br_op, alu_req_if.imm, alu_req_if.rs1_is_PC, alu_req_if.rs2_is_imm, alu_req_if.rd, alu_req_if.wb, alu_req_if.tid, alu_req_if.rs1_data, alu_req_if.rs2_data}),
.data_out ({alu_req_if.wid, alu_req_if.tmask, alu_req_if.PC, alu_req_if.next_PC, alu_req_if.op_type, alu_req_if.is_br_op, alu_req_if.imm, alu_req_if.rs1_is_PC, alu_req_if.rs2_is_imm, alu_req_if.rd, alu_req_if.wb, alu_req_if.tid, alu_req_if.rs1_data, alu_req_if.rs2_data}),
.ready_out (alu_req_if.ready),
.valid_out (alu_req_if.valid)
);
@@ -64,7 +64,7 @@ module VX_instr_demux (
.valid_in (lsu_req_valid),
.inst_in ({execute_if.wid, execute_if.tmask, execute_if.PC, `LSU_RW(execute_if.op_type), `LSU_BE(execute_if.op_type), execute_if.imm, execute_if.rd, execute_if.wb}),
.opds_in ({gpr_rsp_if.rs1_data, gpr_rsp_if.rs2_data}),
.data_out ({lsu_req_if.wid, lsu_req_if.tmask, lsu_req_if.PC, lsu_req_if.rw, lsu_req_if.byteen, lsu_req_if.offset, lsu_req_if.rd, lsu_req_if.wb, lsu_req_if.base_addr, lsu_req_if.store_data}),
.data_out ({lsu_req_if.wid, lsu_req_if.tmask, lsu_req_if.PC, lsu_req_if.rw, lsu_req_if.byteen, lsu_req_if.offset, lsu_req_if.rd, lsu_req_if.wb, lsu_req_if.base_addr, lsu_req_if.store_data}),
.ready_out (lsu_req_if.ready),
.valid_out (lsu_req_if.valid)
);
@@ -94,7 +94,7 @@ module VX_instr_demux (
.valid_in (csr_req_valid),
.inst_in ({execute_if.wid, execute_if.tmask, execute_if.PC, `CSR_OP(execute_if.op_type), execute_if.imm[`CSR_ADDR_BITS-1:0], execute_if.rd, execute_if.wb, 1'b0}),
.opds_in ({csr_req_mask}),
.data_out ({csr_req_if.wid, csr_req_if.tmask, csr_req_if.PC, csr_req_if.op_type, csr_req_if.csr_addr, csr_req_if.rd, csr_req_if.wb, csr_req_if.is_io, csr_req_if.csr_mask}),
.data_out ({csr_req_if.wid, csr_req_if.tmask, csr_req_if.PC, csr_req_if.op_type, csr_req_if.csr_addr, csr_req_if.rd, csr_req_if.wb, csr_req_if.is_io, csr_req_if.csr_mask}),
.ready_out (csr_req_if.ready),
.valid_out (csr_req_if.valid)
);
@@ -115,7 +115,7 @@ module VX_instr_demux (
.valid_in (mul_req_valid),
.inst_in ({execute_if.wid, execute_if.tmask, execute_if.PC, `MUL_OP(execute_if.op_type), execute_if.rd, execute_if.wb}),
.opds_in ({gpr_rsp_if.rs1_data, gpr_rsp_if.rs2_data}),
.data_out ({mul_req_if.wid, mul_req_if.tmask, mul_req_if.PC, mul_req_if.op_type, mul_req_if.rd, mul_req_if.wb, mul_req_if.rs1_data, mul_req_if.rs2_data}),
.data_out ({mul_req_if.wid, mul_req_if.tmask, mul_req_if.PC, mul_req_if.op_type, mul_req_if.rd, mul_req_if.wb, mul_req_if.rs1_data, mul_req_if.rs2_data}),
.ready_out (mul_req_if.ready),
.valid_out (mul_req_if.valid)
);
@@ -137,7 +137,7 @@ module VX_instr_demux (
.valid_in (fpu_req_valid),
.inst_in ({execute_if.wid, execute_if.tmask, execute_if.PC, `FPU_OP(execute_if.op_type), execute_if.op_mod, execute_if.rd, execute_if.wb}),
.opds_in ({gpr_rsp_if.rs1_data, gpr_rsp_if.rs2_data, gpr_rsp_if.rs3_data}),
.data_out ({fpu_req_if.wid, fpu_req_if.tmask, fpu_req_if.PC, fpu_req_if.op_type, fpu_req_if.op_mod, fpu_req_if.rd, fpu_req_if.wb, fpu_req_if.rs1_data, fpu_req_if.rs2_data, fpu_req_if.rs3_data}),
.data_out ({fpu_req_if.wid, fpu_req_if.tmask, fpu_req_if.PC, fpu_req_if.op_type, fpu_req_if.op_mod, fpu_req_if.rd, fpu_req_if.wb, fpu_req_if.rs1_data, fpu_req_if.rs2_data, fpu_req_if.rs3_data}),
.ready_out (fpu_req_if.ready),
.valid_out (fpu_req_if.valid)
);
@@ -156,9 +156,9 @@ module VX_instr_demux (
.reset (reset),
.ready_in (gpu_req_ready),
.valid_in (gpu_req_valid),
.inst_in ({execute_if.wid, execute_if.tmask, execute_if.PC, next_PC, `GPU_OP(execute_if.op_type), execute_if.rd, execute_if.wb}),
.inst_in ({execute_if.wid, execute_if.tmask, execute_if.PC, next_PC, `GPU_OP(execute_if.op_type), execute_if.rd, execute_if.wb}),
.opds_in ({gpr_rsp_if.rs1_data, gpr_rsp_if.rs2_data[0]}),
.data_out ({gpu_req_if.wid, gpu_req_if.tmask, gpu_req_if.PC, gpu_req_if.next_PC, gpu_req_if.op_type, gpu_req_if.rd, gpu_req_if.wb, gpu_req_if.rs1_data, gpu_req_if.rs2_data}),
.data_out ({gpu_req_if.wid, gpu_req_if.tmask, gpu_req_if.PC, gpu_req_if.next_PC, gpu_req_if.op_type, gpu_req_if.rd, gpu_req_if.wb, gpu_req_if.rs1_data, gpu_req_if.rs2_data}),
.ready_out (gpu_req_if.ready),
.valid_out (gpu_req_if.valid)
);

1
hw/rtl/cache/VX_cache.v vendored
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@@ -267,7 +267,6 @@ module VX_cache #(
wire [SNP_REQ_TAG_WIDTH-1:0] curr_bank_snp_rsp_tag;
wire curr_bank_snp_rsp_ready;
wire curr_bank_core_req_ready;
wire curr_bank_miss;
// Core Req

1
hw/rtl/libs/VX_bypass_buffer.v
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@@ -26,7 +26,6 @@ module VX_bypass_buffer #(
always @(posedge clk) begin
if (reset) begin
buffer_valid <= 0;
buffer <= 0;
end else begin
if (ready_out) begin
buffer_valid <= 0;

4
hw/rtl/libs/VX_skid_buffer.v
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@@ -21,10 +21,8 @@ module VX_skid_buffer #(
always @(posedge clk) begin
if (reset) begin
data_out_r <= 0;
buffer <= 0;
use_buffer <= 0;
valid_out_r <= 0;
use_buffer <= 0;
end else begin
if (ready_out) begin
use_buffer <= 0;