gpt-5.4-nano | RAG on

module verified_adder_64bit(
    input  wire        clk,
    input  wire        rst_n,
    input  wire        i_en,
    input  wire [63:0] adda,
    input  wire [63:0] addb,
    output wire [64:0] result,
    output wire        o_en
);

    // Pipeline depth: 3 stages
    // Stage 0: register inputs and enable
    // Stage 1: compute ripple-carry sum with registered inputs
    // Stage 2: register final result and enable

    reg        en_s0, en_s1, en_s2;

    reg [63:0] adda_s0, addb_s0;
    reg [64:0] sum_s1;
    reg [64:0] sum_s2;

    // Ripple-carry adder (combinational for stage 1)
    wire [64:0] sum_comb;
    wire [63:0] s_comb;
    wire [64:0] carry_chain;

    assign carry_chain[0] = 1'b0;

    genvar i;
    generate
        for (i = 0; i < 64; i = i + 1) begin : rca_gen
            assign {carry_chain[i+1], s_comb[i]} = adda_s0[i] + addb_s0[i] + carry_chain[i];
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit
3 error(s) during elaboration.
*** These modules were missing:
        adder_pipe_64bit referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit\n3 error(s) during elaboration.\n*** These modules were missing:\n        adder_pipe_64bit referenced 1 times.\n***\n",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": true,
  "syntax_ok": true,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}

module verified_adder_64bit(
    input  wire        clk,
    input  wire        rst_n,
    input  wire        i_en,
    input  wire [63:0] adda,
    input  wire [63:0] addb,
    output reg  [64:0] result,
    output reg         o_en
);

    reg [63:0] adda_r0, addb_r0;
    reg        en_r0;

    reg [63:0] adda_r1, addb_r1;
    reg [63:0] addb_r1;
    reg        en_r1;

    reg [64:0] sum_r2;
    reg        en_r2;

    reg [64:0] sum_r3;
    reg        en_r3;

    wire [64:0] sum_comb0;
    wire [64:0] sum_comb1;

    assign sum_comb0 = {1'b0, adda_r0} + {1'b0, addb_r0};
    assign sum_comb1 = {1'b0, adda_r1} + {1'b0, addb_r1};

    always @(posedge clk or negedge rst_n) begin
        if (!rst_n) begin
            adda_r0 <= 64'd0;
...

[stderr]
/data/eval/out/run_20260426_070416_680227_376b99/tmp/gpt5_4_nano/rtllm__13_rtllm_arithmetic__task_06/sample_2/generated.v:15: error: 'addb_r1' has already been declared in this scope.
/data/eval/out/run_20260426_070416_680227_376b99/tmp/gpt5_4_nano/rtllm__13_rtllm_arithmetic__task_06/sample_2/generated.v:14:      : It was declared here as a variable.

[stderr]
/data/eval/out/run_20260426_070416_680227_376b99/tmp/gpt5_4_nano/rtllm__13_rtllm_arithmetic__task_06/sample_2/functional/generated.v:15: error: 'addb_r1' has already been declared in this scope.
/data/eval/out/run_20260426_070416_680227_376b99/tmp/gpt5_4_nano/rtllm__13_rtllm_arithmetic__task_06/sample_2/functional/generated.v:14:      : It was declared here as a variable.

[error]
None

[
  {
    "stage": "syntax",
    "code": "syntax.iverilog_failed",
    "message": "/data/eval/out/run_20260426_070416_680227_376b99/tmp/gpt5_4_nano/rtllm__13_rtllm_arithmetic__task_06/sample_2/generated.v:15: error: 'addb_r1' has already been declared in this scope.\n/data/eval/out/run_20260426_070416_680227_376b99/tmp/gpt5_4_nano/rtllm__13_rtllm_arithmetic__task_06/sample_2/generated.v:14:      : It was declared here as a variable.\n",
    "retryable": false,
    "details": {}
  },
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/data/eval/out/run_20260426_070416_680227_376b99/tmp/gpt5_4_nano/rtllm__13_rtllm_arithmetic__task_06/sample_2/functional/generated.v:15: error: 'addb_r1' has already been declared in this scope.\n/data/eval/out/run_20260426_070416_680227_376b99/tmp/gpt5_4_nano/rtllm__13_rtllm_arithmetic__task_06/sample_2/functional/generated.v:14:      : It was declared here as a variable.\n",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": true,
  "syntax_ok": false,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}

module verified_adder_64bit(
    input  wire        clk,
    input  wire        rst_n,
    input  wire        i_en,
    input  wire [63:0] adda,
    input  wire [63:0] addb,
    output reg  [64:0] result,
    output reg         o_en
);

    reg [63:0] adda_r0, addb_r0;
    reg        en_r0;

    reg [63:0] adda_r1, addb_r1;
    reg        en_r1;

    reg [64:0] sum_r2;
    reg        en_r2;

    reg [64:0] sum_r3;
    reg        en_r3;

    wire [64:0] sum_comb0;
    assign sum_comb0 = {1'b0, adda_r0} + {1'b0, addb_r0};

    wire [64:0] sum_comb1;
    assign sum_comb1 = {1'b0, adda_r1} + {1'b0, addb_r1};

    always @(posedge clk or negedge rst_n) begin
        if (!rst_n) begin
            adda_r0 <= 64'd0;
            addb_r0 <= 64'd0;
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit
3 error(s) during elaboration.
*** These modules were missing:
        adder_pipe_64bit referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit\n3 error(s) during elaboration.\n*** These modules were missing:\n        adder_pipe_64bit referenced 1 times.\n***\n",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": true,
  "syntax_ok": true,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}

module verified_adder_64bit(
    input  wire        clk,
    input  wire        rst_n,
    input  wire        i_en,
    input  wire [63:0] adda,
    input  wire [63:0] addb,
    output wire [64:0] result,
    output wire        o_en
);

    // Pipeline depth: 3 stages (enable sync + registered sum)
    reg [2:0] en_pipe;

    // Stage 1: compute ripple-carry sum (combinational) and register
    reg [64:0] sum_s1;

    // Stage 2: register again to form additional pipeline stage
    reg [64:0] sum_s2;

    // Stage 3: final output register
    reg [64:0] sum_s3;

    // Ripple-carry combinational computation for stage 1
    wire [63:0] s_comb;
    wire [64:0] sum_comb;
    wire c0;

    assign c0 = 1'b0;

    genvar i;
    wire [64:0] c;
    assign c[0] = c0;
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit
3 error(s) during elaboration.
*** These modules were missing:
        adder_pipe_64bit referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit\n3 error(s) during elaboration.\n*** These modules were missing:\n        adder_pipe_64bit referenced 1 times.\n***\n",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": true,
  "syntax_ok": true,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}

module verified_adder_64bit(
    input  wire        clk,
    input  wire        rst_n,
    input  wire        i_en,
    input  wire [63:0] adda,
    input  wire [63:0] addb,
    output wire [64:0] result,
    output wire        o_en
);

    // Pipeline depth: 3 stages (enable sync + registered sum)
    reg [2:0] en_pipe;

    // Stage 0: compute combinational ripple carry sum (registered in stage 1)
    wire [64:0] sum_comb;
    assign sum_comb = {1'b0, adda} + {1'b0, addb};

    // Stage 1 registers
    reg [64:0] sum_s1;

    // Stage 2 registers (optional extra pipeline stage)
    reg [64:0] sum_s2;

    // Stage 3 output register
    reg [64:0] result_r;
    reg        o_en_r;

    always @(posedge clk or negedge rst_n) begin
        if (!rst_n) begin
            en_pipe   <= 3'b000;
            sum_s1    <= 65'd0;
            sum_s2    <= 65'd0;
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit
3 error(s) during elaboration.
*** These modules were missing:
        adder_pipe_64bit referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit\n3 error(s) during elaboration.\n*** These modules were missing:\n        adder_pipe_64bit referenced 1 times.\n***\n",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": true,
  "syntax_ok": true,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}

module verified_adder_64bit(
    input  wire        clk,
    input  wire        rst_n,
    input  wire        i_en,
    input  wire [63:0] adda,
    input  wire [63:0] addb,
    output wire [64:0] result,
    output wire        o_en
);

    // Pipeline depth: 3 stages (enable sync + registered sum)
    reg [2:0] en_pipe;

    // Stage 1: compute ripple-carry sum (combinational) and register
    reg [64:0] sum_s1;

    // Stage 2: register again
    reg [64:0] sum_s2;

    // Stage 3: final register
    reg [64:0] sum_s3;

    // Ripple-carry internal signals
    wire [63:0] s_comb;
    wire [64:0] sum_comb;
    wire [64:0] add_ext;

    assign add_ext = {1'b0, adda} + {1'b0, addb};
    assign sum_comb = add_ext;

    // Also provide explicit ripple-carry structure (synthesizable)
    // Carry chain: c[0]=0, c[64]=carry out
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit
3 error(s) during elaboration.
*** These modules were missing:
        adder_pipe_64bit referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit\n3 error(s) during elaboration.\n*** These modules were missing:\n        adder_pipe_64bit referenced 1 times.\n***\n",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": true,
  "syntax_ok": true,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}

module verified_adder_64bit(
    input  wire         clk,
    input  wire         rst_n,
    input  wire         i_en,
    input  wire [63:0] adda,
    input  wire [63:0] addb,
    output wire [64:0] result,
    output wire         o_en
);

    // Pipeline depth (several registers)
    localparam integer STAGES = 3;

    // Stage enable pipeline
    reg [STAGES-1:0] en_pipe;

    // Stage registers for operands and partial sums
    reg [63:0] a_r0, b_r0;
    reg [64:0] sum_r1, sum_r2, sum_r3;

    // Ripple-carry adder (combinational) for each stage
    wire [64:0] sum_comb0;
    wire [64:0] sum_comb1;
    wire [64:0] sum_comb2;

    // Stage 0 ripple carry: adda + addb
    assign sum_comb0 = {1'b0, adda} + {1'b0, addb};

    // Stage 1 ripple carry: registered operands from stage 0
    assign sum_comb1 = {1'b0, a_r0} + {1'b0, b_r0};

    // Stage 2 ripple carry: registered sum from stage 1 (still ripple-carry style via +)
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit
3 error(s) during elaboration.
*** These modules were missing:
        adder_pipe_64bit referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit\n3 error(s) during elaboration.\n*** These modules were missing:\n        adder_pipe_64bit referenced 1 times.\n***\n",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": true,
  "syntax_ok": true,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}

module verified_adder_64bit(
    input  wire        clk,
    input  wire        rst_n,
    input  wire        i_en,
    input  wire [63:0] adda,
    input  wire [63:0] addb,
    output wire [64:0] result,
    output wire        o_en
);

    // Pipeline depth: 3 stages (input enable sync + two compute/register stages)
    reg [2:0] en_pipe;

    // Stage 1 registers (operands)
    reg [63:0] adda_r1, addb_r1;

    // Stage 2 registers (partial sum and carry)
    reg [64:0] sum_r2;

    // Stage 3 output register
    reg [64:0] result_r3;

    assign result = result_r3;
    assign o_en   = en_pipe[2];

    // Ripple-carry adder (combinational) used inside stage 2
    function [64:0] rca64;
        input [63:0] a;
        input [63:0] b;
        integer i;
        reg [64:0] s;
        reg c;
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit
3 error(s) during elaboration.
*** These modules were missing:
        adder_pipe_64bit referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit\n3 error(s) during elaboration.\n*** These modules were missing:\n        adder_pipe_64bit referenced 1 times.\n***\n",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": true,
  "syntax_ok": true,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}

module verified_adder_64bit(
    input  wire        clk,
    input  wire        rst_n,
    input  wire        i_en,
    input  wire [63:0] adda,
    input  wire [63:0] addb,
    output wire [64:0] result,
    output wire        o_en
);

    // Pipeline depth: 3 stages (enable sync + registered sum)
    reg [2:0] en_pipe;

    // Stage 0 registered operands (optional but helps timing/pipelining)
    reg [63:0] adda_r0, addb_r0;

    // Stage 1: compute ripple carry adder combinationally from registered operands,
    // then register full 65-bit result.
    reg [64:0] sum_r1;

    // Stage 2: output register
    reg [64:0] sum_r2;

    // Ripple-carry adder (combinational)
    wire [64:0] sum_comb;
    assign sum_comb = {1'b0, adda_r0} + {1'b0, addb_r0};

    // Output assignments
    assign result = sum_r2;
    assign o_en   = en_pipe[2];

    always @(posedge clk or negedge rst_n) begin
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit
3 error(s) during elaboration.
*** These modules were missing:
        adder_pipe_64bit referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit\n3 error(s) during elaboration.\n*** These modules were missing:\n        adder_pipe_64bit referenced 1 times.\n***\n",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": true,
  "syntax_ok": true,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}

module verified_adder_64bit(
    input  wire        clk,
    input  wire        rst_n,
    input  wire        i_en,
    input  wire [63:0] adda,
    input  wire [63:0] addb,
    output reg  [64:0] result,
    output reg         o_en
);

    // Pipeline registers (3-stage enable pipeline)
    reg en_d1, en_d2, en_d3;

    // Stage 1: compute full 65-bit sum combinationally, register it
    reg [64:0] sum_s1;

    // Stage 2: register again (pipeline stage)
    reg [64:0] sum_s2;

    // Stage 3: final register to output
    reg [64:0] sum_s3;

    // Ripple-carry adder (64-bit) producing 65-bit sum
    wire [63:0] s_rca;
    wire [64:0] sum_rca;
    wire [64:0] c;

    assign c[0] = 1'b0;

    genvar i;
    generate
        for (i = 0; i < 64; i = i + 1) begin : rca_bits
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit
3 error(s) during elaboration.
*** These modules were missing:
        adder_pipe_64bit referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_06/tb.v:69: error: Unknown module type: adder_pipe_64bit\n3 error(s) during elaboration.\n*** These modules were missing:\n        adder_pipe_64bit referenced 1 times.\n***\n",
    "retryable": false,
    "details": {}
  }
]

{
  "llm_ok": true,
  "extract_ok": true,
  "syntax_ok": true,
  "functional_ok": false,
  "openlane_ok": false,
  "syntax_required": true,
  "functional_required": true,
  "openlane_required": true,
  "final_success": false,
  "success": false
}