gpt-5.4-nano | RAG on

module verified_radix2_div (
    input              clk,
    input              rst,
    input              sign,
    input      [7:0]  dividend,
    input      [7:0]  divisor,
    input              opn_valid,
    input              res_ready,
    output reg         res_valid,
    output reg [15:0] result
);

    reg        busy;
    reg [7:0]  divd_abs;
    reg [7:0]  divs_abs;
    reg [7:0]  sr;                 // remainder register (8-bit)
    reg [7:0]  q;                  // quotient register (8-bit)
    reg [8:0]  neg_divisor;        // two's complement of abs(divisor), 9-bit for safe subtract
    reg [3:0]  cnt;                // counts 0..8
    reg        start_cnt;

    wire [7:0] dividend_in = dividend;
    wire [7:0] divisor_in  = divisor;

    wire divd_is_neg = sign & dividend_in[7];
    wire divs_is_neg = sign & divisor_in[7];

    wire [7:0] divd_abs_w = divd_is_neg ? (~dividend_in + 8'd1) : dividend_in;
    wire [7:0] divs_abs_w = divs_is_neg ? (~divisor_in + 8'd1) : divisor_in;

    wire q_sign = divd_is_neg ^ divs_is_neg;
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div
3 error(s) during elaboration.
*** These modules were missing:
        radix2_div referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div\n3 error(s) during elaboration.\n*** These modules were missing:\n        radix2_div 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_radix2_div (
    input              clk,
    input              rst,
    input              sign,
    input      [7:0]  dividend,
    input      [7:0]  divisor,
    input              opn_valid,
    input              res_ready,
    output reg         res_valid,
    output reg [15:0] result
);

    reg        busy;
    reg [3:0]  cnt;          // counts 0..8
    reg        start_cnt;

    reg [15:0] SR;          // {remainder[7:0], quotient[7:0]} during algorithm
    reg [15:0] NEG_DIVISOR; // -abs(divisor) in 16-bit two's complement

    reg [7:0]  abs_dividend;
    reg [7:0]  abs_divisor;
    reg        neg_quot;     // quotient sign
    reg        neg_rem;      // remainder sign (same as dividend sign for signed division)

    wire [7:0] dividend_mag = (sign && dividend[7]) ? (~dividend + 8'd1) : dividend;
    wire [7:0] divisor_mag  = (sign && divisor[7])  ? (~divisor + 8'd1)  : divisor;

    // Division datapath: operate on remainder (upper 8 bits) and quotient (lower 8 bits)
    // SR update rule:
    //   rem' = rem - abs_divisor
    //   if rem' >= 0 => keep rem' and set next quotient bit to 1
    //   else          => keep old rem and set next quotient bit to 0
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div
3 error(s) during elaboration.
*** These modules were missing:
        radix2_div referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div\n3 error(s) during elaboration.\n*** These modules were missing:\n        radix2_div 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_radix2_div (
    input              clk,
    input              rst,
    input              sign,
    input      [7:0]  dividend,
    input      [7:0]  divisor,
    input              opn_valid,
    input              res_ready,
    output reg         res_valid,
    output reg [15:0] result
);

    // Internal state
    reg        busy;
    reg [3:0]  cnt;              // counts 1..8
    reg        start_cnt;

    reg [15:0] SR;               // [15:8]=remainder, [7:0]=quotient (shifted-in via algorithm)
    reg [15:0] NEG_DIVISOR;     // negative absolute divisor in 16-bit two's complement

    reg [7:0]  abs_dividend;
    reg [7:0]  abs_divisor;

    reg        q_neg;           // quotient sign
    reg        r_neg;           // remainder sign (same as dividend for signed division)

    wire [7:0] dividend_abs_u = (sign && dividend[7]) ? (~dividend + 8'd1) : dividend;
    wire [7:0] divisor_abs_u  = (sign && divisor[7])  ? (~divisor + 8'd1)  : divisor;

    // Division step wires
    wire [15:0] sub_val = SR - NEG_DIVISOR; // SR + abs_divisor (since NEG_DIVISOR is -abs_divisor)
    wire        carry_out = sub_val[15];     // use MSB as carry/borrow indicator per described mux behavior
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div
3 error(s) during elaboration.
*** These modules were missing:
        radix2_div referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div\n3 error(s) during elaboration.\n*** These modules were missing:\n        radix2_div 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_radix2_div (
    input              clk,
    input              rst,
    input              sign,
    input      [7:0]  dividend,
    input      [7:0]  divisor,
    input              opn_valid,
    input              res_ready,
    output reg         res_valid,
    output reg [15:0] result
);

    reg        busy;
    reg [3:0]  cnt;               // counts 0..8
    reg        start_cnt;

    reg [15:0] SR;                // {R[7:0], Q[7:0]} during algorithm
    reg [15:0] NEG_DIVISOR;      // -abs(divisor) in 16-bit signed form
    reg [7:0]  abs_dividend;
    reg [7:0]  abs_divisor;

    wire [7:0]  R_cur = SR[15:8];
    wire [7:0]  Q_cur = SR[7:0];

    // Subtraction: R - abs(divisor)
    wire [8:0] sub_ext = {1'b0, R_cur} + {1'b0, (~abs_divisor + 1'b1)}; // R + (-abs_divisor)
    wire       carry_out = sub_ext[8]; // 1 means no borrow => subtraction result >= 0

    // Next remainder/quotient update
    wire [7:0] R_next = carry_out ? sub_ext[7:0] : R_cur;
    wire [7:0] Q_next = {Q_cur[6:0], carry_out};
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div
3 error(s) during elaboration.
*** These modules were missing:
        radix2_div referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div\n3 error(s) during elaboration.\n*** These modules were missing:\n        radix2_div 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_radix2_div (
    input              clk,
    input              rst,
    input              sign,
    input      [7:0]  dividend,
    input      [7:0]  divisor,
    input              opn_valid,
    input              res_ready,
    output reg         res_valid,
    output reg [15:0] result
);

    reg        busy;
    reg [3:0]  cnt;              // counts 1..8
    reg        start_cnt;

    reg [15:0] SR;               // {R(8), Q(8)} during algorithm
    reg [15:0] NEG_DIVISOR;     // -abs(divisor) in 16-bit signed domain

    reg [7:0]  abs_dividend;
    reg [7:0]  abs_divisor;

    reg        neg_quot;         // quotient sign
    reg        neg_rem;          // remainder sign (same as dividend for signed division)

    wire [7:0]  dividend_mag = (sign && dividend[7]) ? (~dividend + 8'd1) : dividend;
    wire [7:0]  divisor_mag  = (sign && divisor[7])  ? (~divisor + 8'd1)  : divisor;

    // Division datapath step
    wire [15:0] sub_val = $signed(SR[15:8]) + $signed(NEG_DIVISOR[15:8]); // R + (-abs_divisor)
    wire        carry_out = (sub_val[15:8] == sub_val[15:8]); // placeholder to keep structure
    // For unsigned magnitude compare, carry_out should indicate sub_val >= 0.
...

[stderr]
/data/eval/out/run_20260426_070416_680227_376b99/tmp/gpt5_4_nano/rtllm__13_rtllm_arithmetic__task_10/sample_5/generated.v:90: syntax error
/data/eval/out/run_20260426_070416_680227_376b99/tmp/gpt5_4_nano/rtllm__13_rtllm_arithmetic__task_10/sample_5/generated.v:90: error: Malformed statement

[stderr]
/data/eval/out/run_20260426_070416_680227_376b99/tmp/gpt5_4_nano/rtllm__13_rtllm_arithmetic__task_10/sample_5/functional/generated.v:90: syntax error
/data/eval/out/run_20260426_070416_680227_376b99/tmp/gpt5_4_nano/rtllm__13_rtllm_arithmetic__task_10/sample_5/functional/generated.v:90: error: Malformed statement

[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_10/sample_5/generated.v:90: syntax error\n/data/eval/out/run_20260426_070416_680227_376b99/tmp/gpt5_4_nano/rtllm__13_rtllm_arithmetic__task_10/sample_5/generated.v:90: error: Malformed statement\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_10/sample_5/functional/generated.v:90: syntax error\n/data/eval/out/run_20260426_070416_680227_376b99/tmp/gpt5_4_nano/rtllm__13_rtllm_arithmetic__task_10/sample_5/functional/generated.v:90: error: Malformed statement\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_radix2_div (
    input              clk,
    input              rst,
    input              sign,
    input      [7:0]  dividend,
    input      [7:0]  divisor,
    input              opn_valid,
    input              res_ready,
    output reg         res_valid,
    output reg [15:0] result
);

    reg [7:0]  dividend_latched;
    reg [7:0]  divisor_latched;

    reg        neg_dividend;
    reg        neg_divisor;
    reg        neg_quotient;

    reg [8:0]  SR;              // {R[7:0], Q[0]} style: we will use SR[8:1] as remainder and SR[0] as quotient bit being shifted in
    reg [8:0]  NEG_DIVISOR;     // negative absolute divisor in 9-bit two's complement
    reg [3:0]  cnt;
    reg        start_cnt;

    reg [7:0]  abs_dividend;
    reg [7:0]  abs_divisor;

    wire [8:0] SR_rem = SR[8:1]; // current remainder (8 bits)
    wire [8:0] SR_ext = {1'b0, SR_rem}; // 9-bit for arithmetic

    // subtraction: rem - abs_divisor, but using NEG_DIVISOR = -abs_divisor
    wire [8:0] sub_sum = SR_ext + NEG_DIVISOR;
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div
3 error(s) during elaboration.
*** These modules were missing:
        radix2_div referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div\n3 error(s) during elaboration.\n*** These modules were missing:\n        radix2_div 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_radix2_div (
    input              clk,
    input              rst,
    input              sign,
    input      [7:0]  dividend,
    input      [7:0]  divisor,
    input              opn_valid,
    input              res_ready,
    output reg         res_valid,
    output reg [15:0] result
);

    reg        busy;
    reg [3:0]  cnt;
    reg        start_cnt;

    reg [15:0] SR;              // {remainder[7:0], quotient[7:0]} during operation
    reg [15:0] NEG_DIVISOR;    // -abs(divisor) in 16-bit signed form

    reg [7:0]  abs_dividend;
    reg [7:0]  abs_divisor;

    reg        div_zero;
    reg        neg_quot;        // quotient sign
    reg        neg_rem;         // remainder sign (same as dividend for signed division)

    wire [7:0] dividend_mag = (sign && dividend[7]) ? (~dividend + 8'd1) : dividend;
    wire [7:0] divisor_mag  = (sign && divisor[7])  ? (~divisor  + 8'd1) : divisor;

    // subtraction: SR[15:8] - abs(divisor)
    wire [8:0] sub_ext = {1'b0, SR[15:8]} - {1'b0, abs_divisor};
    wire       carry_out = ~sub_ext[8]; // carry_out==1 means subtraction did not underflow
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div
3 error(s) during elaboration.
*** These modules were missing:
        radix2_div referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div\n3 error(s) during elaboration.\n*** These modules were missing:\n        radix2_div 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_radix2_div (
    input              clk,
    input              rst,
    input              sign,
    input      [7:0]  dividend,
    input      [7:0]  divisor,
    input              opn_valid,
    input              res_ready,
    output reg         res_valid,
    output reg [15:0] result
);

    reg [7:0]  dvd_abs;
    reg [7:0]  dvs_abs;

    reg        dvd_neg;
    reg        dvs_neg;

    reg [15:0] SR;              // {remainder[7:0], quotient[7:0]}
    reg [15:0] NEG_DIVISOR;    // negative absolute divisor in 16-bit two's complement
    reg [3:0]  cnt;            // counts 1..8
    reg        start_cnt;

    reg        busy;
    reg [7:0]  q_mag;
    reg [7:0]  r_mag;

    wire [7:0]  dvd_in = dividend;
    wire [7:0]  dvs_in = divisor;

    wire        div_by_zero = (dvs_in == 8'd0);
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div
3 error(s) during elaboration.
*** These modules were missing:
        radix2_div referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div\n3 error(s) during elaboration.\n*** These modules were missing:\n        radix2_div 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_radix2_div (
    input              clk,
    input              rst,
    input              sign,
    input      [7:0]  dividend,
    input      [7:0]  divisor,
    input              opn_valid,
    input              res_ready,
    output reg         res_valid,
    output reg [15:0] result
);

    reg [7:0]  dividend_r;
    reg [7:0]  divisor_r;
    reg        sign_r;

    reg [8:0]  SR;              // {remainder[7:0], quotient_bit(0)}; remainder is SR[8:1], quotient is SR[0]
    reg [8:0]  NEG_DIVISOR;     // negated absolute divisor, 9-bit signed magnitude for subtraction
    reg [3:0]  cnt;
    reg        start_cnt;

    reg         busy;

    wire [7:0] abs_dividend;
    wire [7:0] abs_divisor;

    assign abs_dividend = (sign_r && dividend_r[7]) ? (~dividend_r + 8'd1) : dividend_r;
    assign abs_divisor  = (sign_r && divisor_r[7])  ? (~divisor_r  + 8'd1) : divisor_r;

    // For subtraction: SR[8:1] - abs_divisor, but implemented as SR[8:1] + NEG_DIVISOR
    // NEG_DIVISOR is 9-bit with abs_divisor in lower 8 bits and sign bit set for two's complement.
    // We'll compute NEG_DIVISOR from abs_divisor when starting.
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div
3 error(s) during elaboration.
*** These modules were missing:
        radix2_div referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div\n3 error(s) during elaboration.\n*** These modules were missing:\n        radix2_div 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_radix2_div (
    input              clk,
    input              rst,
    input              sign,
    input      [7:0]  dividend,
    input      [7:0]  divisor,
    input              opn_valid,
    input              res_ready,
    output reg         res_valid,
    output reg [15:0] result
);

    reg        busy;
    reg [3:0]  cnt;              // counts 1..8
    reg        start_cnt;

    reg [15:0] SR;               // {remainder[7:0], quotient[7:0]} during algorithm
    reg [15:0] NEG_DIVISOR;      // -abs(divisor) in 16-bit signed form

    reg [7:0]  abs_dividend;
    reg [7:0]  abs_divisor;
    reg        neg_quotient;
    reg        neg_remainder;

    wire [7:0]  div_abs_u = (divisor[7] && sign) ? (~divisor + 8'd1) : divisor;
    wire [7:0]  dvd_abs_u = (dividend[7] && sign) ? (~dividend + 8'd1) : dividend;

    wire [15:0] neg_divisor_calc = {8'd0, (~div_abs_u + 8'd1)}; // -abs(divisor) as 16-bit
    wire [15:0] sub_val = SR[15:8] + NEG_DIVISOR[15:8]; // remainder + (-abs(divisor)) => remainder - abs(divisor)
    wire        carry_out = (sub_val[15:8] == sub_val[7:0]) ? 1'b0 : 1'b0; // unused; keep simple

    // Proper carry-out for 8-bit subtraction: use 9-bit
...

[stderr]
/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div
3 error(s) during elaboration.
*** These modules were missing:
        radix2_div referenced 1 times.
***

[error]
None

[
  {
    "stage": "functional",
    "code": "functional.testbench_failed",
    "message": "/workspace/banchmarks/rtllm/13_rtllm_arithmetic/task_10/tb.v:14: error: Unknown module type: radix2_div\n3 error(s) during elaboration.\n*** These modules were missing:\n        radix2_div 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
}