raygentop → comb_mult_add_16_mode · 20260914-000233-ef78a2

benchadapt adaptation run · record at outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/20260914-000233-ef78a2

run id: 20260914-000233-ef78a2
started: 2026-09-14 00:02:33 -0700
finished: 2026-09-14 00:08:33 -0700
suite / design: vtr_demo / raygentop
target mode: comb_mult_add_16_mode
tier: needs restructuring (T2) — the region did not fit the mode as is
outcome: ACCEPTED — reviewer agent confirmed
editor attempts: 1 (editor calls against the one approved plan; record field iterations)
wall clock: 5m 59s (agents 5m 15s, VTR and other 45s) [359.5 s total; 'other' is synthesis-only checks and framework time between calls]
models per role: planner: anthropic/claude-opus-5
reviewer:plan: anthropic/claude-opus-5
editor: anthropic/claude-opus-5
reviewer:acceptance: anthropic/claude-opus-5
VPR arguments: channel width 300 · device koios_extra_small · seed 1 (from run.json)
repo commit: 6583c391b705 with uncommitted changes to tracked files
sandbox: bubblewrap (recorded per agent call, before the run-level field existed: every call in this run ran in its own mount namespace)
agent reads: none outside the agents' own working directories (paths each agent named outside its own working directory, computed from the tool events; its own scratch excluded)
prompt set: cea07cb25821 (sha256 over 6 templates in src/agents and 10 inline pieces; full value in run.json prompt_set)

exported 2026-09-14T18:11:53-07:00

Mode contract

recorded (outcome.json contract field)

Verbatim, as recorded with the run and sent to the agents.

Hard-block primitive to instantiate: `comb_mult_add_16`   (precision INT16)
  computes: out = ax*ay + bx
  input ports:  ax[16], ay[16], bx[32]
  output ports: result[64]
  arithmetic: the block's operands and result are signed two's complement. A design operand narrower than its port must be widened to the port width: zero-extended if the design treats it as unsigned, sign-extended if signed. An unsigned design operand as wide as its port has no exact representation on this block.
  timing: the block is combinational; `result` is valid in the same cycle the inputs are applied (no clock port).
  Wire EVERY operand of the fused region onto the input ports (name them exactly as above); drive the region's real consumer from the output port. Tie unused term ports to 0. Do not leave input ports unconnected.

Agent calls

4 call(s), in order

Call 1 · planner · anthropic/claude-opus-5 · ok in 10 · out 9137 · reasoning 0 · cache read 59784 · cache write 24628 · 132.3 s

prompt

You are the Planner. Choose the best region(s) in raygentop.v to adapt so hard-block mode
'comb_mult_add_16_mode' (Hard-block primitive to instantiate: comb_mult_add_16 (precision INT16)
computes: out = ax*ay + bx
input ports: ax[16], ay[16], bx[32]
output ports: result[64]
arithmetic: the block's operands and result are signed two's complement. A design operand narrower than its port must be widened to the port width: zero-extended if the design treats it as unsigned, sign-extended if signed. An unsigned design operand as wide as its port has no exact representation on this block.
timing: the block is combinational; result is valid in the same cycle the inputs are applied (no clock port).
Wire EVERY operand of the fused region onto the input ports (name them exactly as above); drive the region's real consumer from the output port. Tie unused term ports to 0. Do not leave input ports unconnected.) is exercised, then write a concrete plan. Do NOT edit files —
output the header + plan only.

Pick the most REPRESENTATIVE mapping — arithmetic a real designer of THIS workload would actually
map to 'comb_mult_add_16_mode', never fabricated computation. For a sum-of-products / MAC mode you must
find product terms that ALREADY feed a COMMON reduction (a shared sum/accumulator); products that
feed SEPARATE outputs (e.g. distinct systolic-array elements) must NOT be fused. An isolated scalar
multiply is NOT a representative sum-of-products target. If nothing representative exists, output
TIER: NONE.

Classify the tier of the change you propose (a datatype/algorithm variant, T3, is out of scope —
do not propose one):

T1: Direct replacement: no change to the computed function or surrounding structure; no datatype change.
T2: Local restructuring only; preserve the region's function, role, and live consumers; no new operation/datatype family.

Read the source. Output EXACTLY this header (uppercase keys), then the plan:

TIER: T1 | T2 | NONE
REGIONS: <comma-separated region id(s)> # one id for a direct swap; N ids for a fusion
SHARED_REDUCTION: <the signal/module the terms feed> # or NONE for a single region
MAPPING: <which operands map to which of the mode's ports>
PLAN: <how the module's live inputs/outputs and downstream consumers are preserved; any introduced
operations/datatypes (should be NONE for T1/T2); and the main risks>

Output rules: no preamble before the TIER line — read the source first, then write. You
are one step of an automated pipeline: a reviewer runs automatically on this plan, you
cannot invoke it, and no human reads your output, so do not end with a question or an
offer.

Read these files in this directory: raygentop.v

response

1 paragraph break restored by the export, where the recorder joined text blocks with no separator.

I'll read the source first.

TIER: T2
REGIONS: bilinearintrp.$mul$raygentop.v:2874$348, bilinearintrp.$mul$raygentop.v:2875$349, bilinearintrp.$mul$raygentop.v:2876$350, bilinearintrp.$mul$raygentop.v:2877$351, bilinearintrp.$mul$raygentop.v:2878$352, bilinearintrp.$mul$raygentop.v:2879$353, bilinearintrp.$mul$raygentop.v:2880$354, bilinearintrp.$mul$raygentop.v:2881$355, bilinearintrp.$mul$raygentop.v:2882$356
SHARED_REDUCTION: The three per-channel barycentric dot products in bilinearintrp (raygentop.v:2762): assign r = (i1r + i2r + i3r) (line 2884), assign g = (i1g + i2g + i3g) (2885), assign b = (i1b + i2b + i3b) (2886) — i.e. r/g/b, driving blr/blg/blb at the instantiation on line 2012. Each channel is one 3-term sum-of-products u*cu + v*cv + w*cw; the three channels are three separate reductions and are NOT fused with each other.
MAPPING: Nine comb_mult_add_16 instances, three chained per channel (chain carries the partial sum through bx; only the head of each chain has bx tied to 0). All design operands are unsigned and narrower than 16 bits, so every operand is zero-extended to the 16-bit port width.

Red chain:
- mar0: ax = {8'b0, ul_d} (8-bit ul, delayed), ay = {9'b0, rul_d} (7-bit rul, delayed), bx = 32'b0 → mar0_res (replaces mul $348, ul*rul).
- mar1: ax = {8'b0, vl_d}, ay = {9'b0, rvl_d}, bx = mar0_res[31:0] → mar1_res (replaces mul $349, vl*rvl, plus the first add of line 2884).
- mar2: ax = {8'b0, wl_d}, ay = {9'b0, rwl_d}, bx = mar1_res[31:0] → mar2_res (replaces mul $350, wl*rwl, plus the second add of line 2884).
- assign r = mar2_res[6:0];
Green chain (mag0/1/2): same ax operands ul_d/vl_d/wl_d; ay = {9'b0, gul_d} / {9'b0, gvl_d} / {9'b0, gwl_d}; bx = 0 / mag0_res[31:0] / mag1_res[31:0]; replaces muls $351/$352/$353 and the adds of line 2885; assign g = mag2_res[6:0];
Blue chain (mab0/1/2): ay = {9'b0, bul_d} / {9'b0, bvl_d} / {9'b0, bwl_d}; bx = 0 / mab0_res[31:0] / mab1_res[31:0]; replaces muls $354/$355/$356 and the adds of line 2886; assign b = mab2_res[6:0];

No comb_mult_add_16 input port is left unconnected; the only tied-to-zero ports are the bx of the three chain heads.

PLAN:

Retiming so the fused block sees the right operands. The hard block is combinational, but in the current RTL the products are registered (i1r <= ul*rul, lines 2874–2882, stage 2) and the 3-term reduction is combinational in stage 3 (lines 2884–2886). Multiply and add therefore live in different pipeline stages and cannot be fused as written. Fix by moving the pipeline register from the product side to the operand side, inside the same always @(posedge clk) block at line 2858:
- Delete the nine product registers i1r,i2r,i3r,i1g,i2g,i3g,i1b,i2b,i3b (reg[14:0] decls at lines 2799–2807).
- Add one-cycle delayed copies of the stage-1 operands: ul_d,vl_d,wl_d (reg[7:0]) and rul_d,rvl_d,rwl_d,gul_d,gvl_d,gwl_d,bul_d,bvl_d,bwl_d (reg[6:0]), assigned ul_d <= ul; rul_d <= rul; ... in the same always block. Keep all existing stage-1 assignments (wl <= 8'hFF - u - v, ul <= u, vl <= v, rul <= ru, …) untouched.
- Drive the nine hard blocks from the _d registers and the r/g/b assigns from the chain outputs.
  This is exactly latency-neutral: originally r at cycle N+1 = ul(N)*rul(N) + vl(N)*rvl(N) + wl(N)*rwl(N); after the change r at cycle N+1 = ul_d(N+1)*rul_d(N+1) + … = the same expression. Cycle count, port list, and the selectuv mux stage (lines 2819–2856) are unchanged.
Bit-exactness. ul/vl/wl are 8-bit unsigned, ru..bw are 7-bit unsigned; each product ≤ 255*127 = 32385 fits the existing 15-bit i1r-class regs with no truncation, so nothing is lost by summing at full precision inside the chain. Zero-extension to the signed 16-bit ports is exact (all values ≤ 255 < 2^15), the chain's partial sums are ≤ 3*32385 < 2^17 so bx/result[31:0] never saturates or wraps. The original RTL evaluates i1r+i2r+i3r at 15-bit width and truncates to the 7-bit output; taking result[6:0] yields the identical low 7 bits (both are the true sum mod 2^7), so blr/blg/blb and everything downstream of line 2012 are bit-identical every cycle.
Interface/consumer preservation. bilinearintrp's port list, port widths, clk, and the single instantiation at line 2012 are unchanged; r/g/b stay 7-bit wires. No module above bilinearintrp is touched. No reset exists on these registers today and none is added; X-propagation depth at power-up is unchanged (one register stage before the reduction, as before).
New operations/datatypes: NONE. No adders, shifters, saturation, rounding, or signed/unsigned reinterpretation are introduced — six existing 15-bit adds are absorbed into the bx ports and nine multiplies become the blocks' multipliers. Register count actually drops (135 bits of product registers → 87 bits of operand registers).
Why matmult (raygentop.v:335–343, regions $15–$23) is rejected: although am11..am13 do feed a common sum, the reduction at line 349 adds truncated slices am11[30:15] + am12[30:15] + am13[30:15], i.e. each product is right-shifted by 15 and clipped to 16 bits before the add. comb_mult_add_16 computes ax*ay + bx with no shift between the multiply and the add, so fusing there would change the arithmetic result (different truncation point / different overflow behaviour) and would require inserting new shift-truncate operations — outside T1/T2. The bilinear channels have no intermediate truncation and are the correct representative target.
Risks. (a) Combinational depth: three chained mult-adds per channel form a multiply→add→multiply→add→multiply→add path that is longer than the original single-multiply stage; if the hard block's delay is large this becomes the critical path of bilinearintrp. Mitigation if timing fails: shorten to two blocks per channel (block0 = vl_d*rvl_d + 0, block1 = wl_d*rwl_d + block0, with the ul_d*rul_d term kept as a registered product feeding nothing — but this abandons a fused term, so prefer the 3-chain and only fall back if the reviewer/timing demands it). (b) Nine 64-bit-output blocks for 7-bit results is area-inefficient but is the faithful mapping. (c) Must remember to remove the now-dead i1r..i3b declarations so no latent unconnected-register warnings or accidental readers remain. (d) The retiming must be applied to all three channels consistently, since ul/vl/wl delays are shared across r, g and b.

tool events 7 recorded, 0 error(s)

bash completed wc -l /work/raygentop.v

input

{
 "command": "wc -l /work/raygentop.v"
}

output

2978 /work/raygentop.v

bash completed sed -n '250,420p' /work/raygentop.v

input

{
 "command": "sed -n '250,420p' /work/raygentop.v"
}

output

    always @(state or trigger or count)
    begin
       case (state)
          0 :
                   begin
       				  output_xhdl0 = 1'b0 ; 
                      if (trigger == 1'b1)
                      begin
                         next_state = 1 ; 
                      end
                      else
                      begin
                         next_state = 0 ; 
                      end 
                         temp_count = 1 - 1 ; 
                   end
          1 :
                   begin
                      output_xhdl0 = 1'b1 ; 
                      if (count == 0)
                      begin
                         next_state = 2 ; 
                      end
                      else

                      begin

                         next_state = 1 ; 
                      end 
                         temp_count = count - 1 ; 
                   end
          2 :
                   begin
       				  output_xhdl0 = 1'b0 ; 
                      if (trigger == 1'b0)
                      begin
                         next_state = 0 ; 
                      end
                      else
                      begin
                         next_state = 2 ; 

                      end 
                   end
       endcase 
    end 
 endmodule

module matmult (Ax, Ay, Az, m11, m12, m13, m21, m22, m23, m31, m32, m33, Cx, Cy, Cz, clk);

    input[16 - 1:0] Ax; 
    input[16 - 1:0] Ay; 
    input[16 - 1:0] Az; 
    input[16 - 1:0] m11; 
    input[16 - 1:0] m12; 

    input[16 - 1:0] m13; 
    input[16 - 1:0] m21; 
    input[16 - 1:0] m22; 
    input[16 - 1:0] m23; 
    input[16 - 1:0] m31; 
    input[16 - 1:0] m32; 
    input[16 - 1:0] m33; 
    output[16 - 1:0] Cx; 
    reg[16 - 1:0] Cx;
    output[16 - 1:0] Cy; 
    reg[16 - 1:0] Cy;
    output[16 - 1:0] Cz; 

    reg[16 - 1:0] Cz;
    input clk; 

    reg[16 + 16 - 1:0] am11; 
    reg[16 + 16 - 1:0] am12; 
    reg[16 + 16 - 1:0] am13; 
    reg[16 + 16 - 1:0] am21; 
    reg[16 + 16 - 1:0] am22; 
    reg[16 + 16 - 1:0] am23; 
    reg[16 + 16 - 1:0] am31; 
    reg[16 + 16 - 1:0] am32; 
    reg[16 + 16 - 1:0] am33; 


    always @(posedge clk)
    begin
       am11 <= Ax * m11 ; 
       am12 <= Ay * m12 ; 
       am13 <= Az * m13 ; 
       am21 <= Ax * m21 ; 
       am22 <= Ay * m22 ; 
       am23 <= Az * m23 ; 
       am31 <= Ax * m31 ; 
       am32 <= Ay * m32 ; 
       am33 <= Az * m33 ; 

       //      Cx <= (am11 + am12 + am13) (`widthA+`widthB-2 downto `widthB-1);
       //      Cy <= (am21 + am22 + am23) (`widthA+`widthB-2 downto `widthB-1);
       //      Cz <= (am31 + am32 + am33) (`widthA+`widthB-2 downto `widthB-1);
       Cx <= (am11[16+16-2:16-1] + am12[16+16-2:16-1] + am13[16+16-2:16-1]) ; 
       Cy <= (am21[16+16-2:16-1] + am22[16+16-2:16-1] + am23[16+16-2:16-1]); 
       Cz <= (am31[16+16-2:16-1] + am32[16+16-2:16-1] + am33[16+16-2:16-1]) ;  
    end 
 endmodule

    
    

module rgconfigmemory (CfgAddr, CfgData, CfgData_Ready, want_CfgData, origx, origy, origz, m11, m12, m13, m21, m22, m23, m31, m32, m33, bkcolour, texinfo, globalreset, clk);


    input[3:0] CfgAddr; 
    input[27:0] CfgData; 
    input CfgData_Ready; 
    output want_CfgData; 
    reg want_CfgData;
    output[27:0] origx; 
    reg[27:0] origx;
    output[27:0] origy; 
    reg[27:0] origy;
    output[27:0] origz; 
    reg[27:0] origz;
    output[15:0] m11; 
    reg[15:0] m11;
    output[15:0] m12; 
    reg[15:0] m12;
    output[15:0] m13; 
    reg[15:0] m13;
    output[15:0] m21; 
    reg[15:0] m21;
    output[15:0] m22; 
    reg[15:0] m22;
    output[15:0] m23; 
    reg[15:0] m23;
    output[15:0] m31; 
    reg[15:0] m31;
    output[15:0] m32; 
    reg[15:0] m32;
    output[15:0] m33; 
    reg[15:0] m33;
    output[20:0] bkcolour; 
    reg[20:0] bkcolour;
    output[20:0] texinfo; 

    wire[20:0] texinfo;
    input globalreset; 
    input clk; 

    reg state; 
    reg next_state; 
    wire we; 

    reg[27:0] temp_origx;
    reg[27:0] temp_origy;
    reg[
…[truncated, 4525 chars total]

bash completed sed -n '2800,2930p' /work/raygentop.v

input

{
 "command": "sed -n '2800,2930p' /work/raygentop.v"
}

output

        reg[14:0] i2b; 
        reg[14:0] i3b; 
        reg[14:0] i1g; 
        reg[14:0] i2g; 
        reg[14:0] i3g; 
        reg[14:0] i1r; 
        reg[14:0] i2r; 
        reg[14:0] i3r; 
        reg[6:0] rul; 
        reg[6:0] rvl; 
        reg[6:0] rwl; 
        reg[6:0] gul; 
        reg[6:0] gvl; 
        reg[6:0] gwl; 
        reg[6:0] bul; 
        reg[6:0] bvl; 
        reg[6:0] bwl; 

        always @(selectuv or u01a or u01b or u01c or v01a or v01b or v01c or u10a or 
                 u10b or u10c or v10a or v10b or v10c)
        begin
           case (selectuv)
              3'b000 :
                       begin
                          u = u01a ; 
                          v = v01a ; 
                       end
              3'b001 :
                       begin
                          u = u01b ; 
						 v = v01b ; 
                       end
              3'b010 :
                       begin
                          u = u01c ; 
                          v = v01c ; 
                       end
              3'b100 :
                       begin
                          u = u10a ; 
                          v = v10a ; 
                       end
              3'b101 :
                       begin
                          u = u10b ; 
                          v = v10b ; 
                       end
              3'b110 :
                       begin
                          u = u10c ; 
                          v = v10c ; 
                       end
              default :
                       begin
                          u = 0;
                          v = 0;
                       end
           endcase 
        end 

        always @(posedge clk)
        begin
           wl <= 8'b11111111 - u - v ; 
           ul <= u ; 
           vl <= v ; 
           rul <= ru ; 
           rvl <= rv ; 
           rwl <= rw ; 
           gul <= gu ; 
           gvl <= gv ; 
           gwl <= gw ; 
           bul <= bu ; 
           bvl <= bv ; 
           bwl <= bw ; 
           i1r <= ul * rul ; 
           i2r <= vl * rvl ; 
           i3r <= wl * rwl ; 
           i1g <= ul * gul ; 
           i2g <= vl * gvl ; 
           i3g <= wl * gwl ; 
           i1b <= ul * bul ; 
           i2b <= vl * bvl ; 
           i3b <= wl * bwl ;  
        end 
        assign r = (i1r + i2r + i3r) ;
        assign g = (i1g + i2g + i3g) ;
        assign b = (i1b + i2b + i3b) ;
     endmodule



module fifo3 (datain, writeen, dataout, shiften, globalreset, clk);

    input[18 - 1:0] datain; 
    input writeen; 
    output[18 - 1:0] dataout; 
    wire[18 - 1:0] dataout;
    input shiften; 
    input globalreset; 
    input clk; 

    reg[18 - 1:0] data0; 
    reg[18 - 1:0] data1; 
    reg[18 - 1:0] data2; 

    reg[1:0] pos; 

    assign dataout = data0 ;

    always @(posedge clk)
    begin
       if (globalreset == 1'b1)
       begin
          pos <= 2'b00 ; 
          data0 <= 0 ; 
          data1 <= 0 ; 
          data2 <= 0 ; 
       end
       else
       begin
          if (writeen == 1'b1 & shiften == 1'b1)
          begin
             case (pos)
                2'b00 :
                         begin
                            data0 <= 0 ; 
                            data1 <= 0 ; 
                            data2 <= 0 ; 
                         end

                2'b01 :

bash completed awk 'NR>=2870 && NR<=2886 {printf "%d: %s\n", NR, $0}' /work/raygentop.v; echo ---; awk 'NR>=330 && …

input

{
 "command": "awk 'NR>=2870 && NR<=2886 {printf \"%d: %s\\n\", NR, $0}' /work/raygentop.v; echo ---; awk 'NR>=330 && NR<=346 {printf \"%d: %s\\n\", NR, $0}' /work/raygentop.v"
}

output

2870:            gwl <= gw ; 
2871:            bul <= bu ; 
2872:            bvl <= bv ; 
2873:            bwl <= bw ; 
2874:            i1r <= ul * rul ; 
2875:            i2r <= vl * rvl ; 
2876:            i3r <= wl * rwl ; 
2877:            i1g <= ul * gul ; 
2878:            i2g <= vl * gvl ; 
2879:            i3g <= wl * gwl ; 
2880:            i1b <= ul * bul ; 
2881:            i2b <= vl * bvl ; 
2882:            i3b <= wl * bwl ;  
2883:         end 
2884:         assign r = (i1r + i2r + i3r) ;
2885:         assign g = (i1g + i2g + i3g) ;
2886:         assign b = (i1b + i2b + i3b) ;
---
330:     reg[16 + 16 - 1:0] am33; 
331: 
332: 
333:     always @(posedge clk)
334:     begin
335:        am11 <= Ax * m11 ; 
336:        am12 <= Ay * m12 ; 
337:        am13 <= Az * m13 ; 
338:        am21 <= Ax * m21 ; 
339:        am22 <= Ay * m22 ; 
340:        am23 <= Az * m23 ; 
341:        am31 <= Ax * m31 ; 
342:        am32 <= Ay * m32 ; 
343:        am33 <= Az * m33 ; 
344: 
345:        //      Cx <= (am11 + am12 + am13) (`widthA+`widthB-2 downto `widthB-1);
346:        //      Cy <= (am21 + am22 + am23) (`widthA+`widthB-2 downto `widthB-1);

bash completed awk 'NR>=2760 && NR<=2800 {printf "%d: %s\n", NR, $0}' /work/raygentop.v

input

{
 "command": "awk 'NR>=2760 && NR<=2800 {printf \"%d: %s\\n\", NR, $0}' /work/raygentop.v"
}

output

2760:     end 
2761:  endmodule
2762:      module bilinearintrp (u01a, u01b, u01c, v01a, v01b, v01c, u10a, u10b, u10c, v10a, v10b, v10c, selectuv, ru, rv, rw, gu, gv, gw, bu, bv, bw, r, g, b, clk);
2763: 
2764:         input[7:0] u01a; 
2765:         input[7:0] u01b; 
2766:         input[7:0] u01c; 
2767:         input[7:0] v01a; 
2768:         input[7:0] v01b; 
2769:         input[7:0] v01c; 
2770:         input[7:0] u10a; 
2771:         input[7:0] u10b; 
2772:         input[7:0] u10c; 
2773:         input[7:0] v10a; 
2774:         input[7:0] v10b; 
2775:         input[7:0] v10c; 
2776:         input[2:0] selectuv; 
2777:         input[6:0] ru; 
2778:         input[6:0] rv; 
2779:         input[6:0] rw; 
2780:         input[6:0] gu; 
2781:         input[6:0] gv; 
2782:         input[6:0] gw; 
2783:         input[6:0] bu; 
2784:         input[6:0] bv; 
2785:         input[6:0] bw; 
2786:         output[6:0] r; 
2787:         wire[6:0] r;
2788:         output[6:0] g; 
2789:         wire[6:0] g;
2790:         output[6:0] b; 
2791:         wire[6:0] b;
2792:         input clk; 
2793: 
2794:         reg[7:0] u; 
2795:         reg[7:0] v; 
2796:         reg[7:0] ul; 
2797:         reg[7:0] vl; 
2798:         reg[7:0] wl; 
2799:         reg[14:0] i1b; 
2800:         reg[14:0] i2b;

bash completed grep -n "bilinearintrp\|matmult" /work/raygentop.v

input

{
 "command": "grep -n \"bilinearintrp\\|matmult\" /work/raygentop.v"
}

output

177:    matmult matmultinst(sramdatal[47:32], sramdatal[31:16], sramdatal[15:0], m11, m12, m13, m21, m22, m23, m31, m32, m33, dir[47:32], dir[31:16], dir[15:0], clk); 
298:module matmult (Ax, Ay, Az, m11, m12, m13, m21, m22, m23, m31, m32, m33, Cx, Cy, Cz, clk);
2012:    bilinearintrp bilinearimp (u01a, u01b, u01c, v01a, v01b, v01c, u10a, u10b, u10c, v10a, v10b, v10c, selectuv, shadedata[41:35], shadedata[62:56], shadedata[20:14], shadedata[34:28], shadedata[55:49], shadedata[13:7], shadedata[27:21], shadedata[48:42], shadedata[6:0], blr, blg, blb, clk); 
2762:     module bilinearintrp (u01a, u01b, u01c, v01a, v01b, v01c, u10a, u10b, u10c, v10a, v10b, v10c, selectuv, ru, rv, rw, gu, gv, gw, bu, bv, bw, r, g, b, clk);

bash completed awk 'NR>=1 && NR<=60 {printf "%d: %s\n", NR, $0}' /work/raygentop.v

input

{
 "command": "awk 'NR>=1 && NR<=60 {printf \"%d: %s\\n\", NR, $0}' /work/raygentop.v"
}

output

1:  module paj_raygentop_hierarchy_no_mem (rgwant_addr, rgwant_data, rgread_ready, rgaddr_ready, rgdata_ready, rgwant_read, rgdatain, rgdataout, rgaddrin, rgCont, rgStat, rgCfgData, rgwant_CfgData, rgCfgData_ready, tm3_sram_data_in, tm3_sram_data_out, tm3_sram_addr, tm3_sram_we, tm3_sram_oe, tm3_sram_adsp, clk, fbdata, fbdatavalid, fbnextscanline, raygroup01, raygroupvalid01, busy01, raygroup10, raygroupvalid10, busy10, globalreset, rgData, rgAddr, rgWE, rgAddrValid, rgDone, rgResultData, rgResultReady, rgResultSource);
2: 
3:     output rgwant_addr; 
4:     wire rgwant_addr;
5:     output rgwant_data; 
6:     wire rgwant_data;
7:     output rgread_ready; 
8:     wire rgread_ready;
9:     input rgaddr_ready; 
10:     input rgdata_ready; 
11: 
12:     input rgwant_read; 
13:     input[63:0] rgdatain; 
14:     output[63:0] rgdataout; 
15:     wire[63:0] rgdataout;
16:     input[17:0] rgaddrin; 
17:     input[31:0] rgCont; 
18:     output[31:0] rgStat; 
19:     wire[31:0] rgStat;
20:     input[31:0] rgCfgData; 
21:     output rgwant_CfgData; 
22:     wire rgwant_CfgData;
23:     input rgCfgData_ready; 
24: 
25:     input[63:0] tm3_sram_data_in; 
26:     wire[63:0] tm3_sram_data_in;
27:     output[63:0] tm3_sram_data_out; 
28:     wire[63:0] tm3_sram_data_out;
29:     wire[63:0] tm3_sram_data_xhdl0;
30:     output[18:0] tm3_sram_addr; 
31:     wire[18:0] tm3_sram_addr;
32:     output[7:0] tm3_sram_we; 
33:     wire[7:0] tm3_sram_we;
34:     output[1:0] tm3_sram_oe; 
35:     wire[1:0] tm3_sram_oe;
36:     output tm3_sram_adsp; 
37:     wire tm3_sram_adsp;
38:     input clk; 
39: 
40:     output[63:0] fbdata; 
41:     wire[63:0] fbdata;
42:     output fbdatavalid; 
43:     wire fbdatavalid;
44:     input fbnextscanline; 
45:     output[1:0] raygroup01; 
46:     wire[1:0] raygroup01;
47:     output raygroupvalid01; 
48:     wire raygroupvalid01;
49:     input busy01; 
50:     output[1:0] raygroup10; 
51:     wire[1:0] raygroup10;
52: 
53:     output raygroupvalid10; 
54:     wire raygroupvalid10;
55:     input busy10; 
56:     input globalreset; 
57:     output[31:0] rgData; 
58:     wire[31:0] rgData;
59:     output[3:0] rgAddr; 
60:     wire[3:0] rgAddr;

Call 2 · reviewer:plan · anthropic/claude-opus-5 · ok in 8 · out 3182 · reasoning 0 · cache read 54767 · cache write 8304 · 51.1 s

prompt

1 paragraph break restored by the export, where the recorder joined text blocks with no separator.

You are an INDEPENDENT, fair Reviewer. You did not write this plan. Judge it on merit.
Target mode: comb_mult_add_16_mode Tier: T2 Rule: Local restructuring only; preserve the region's function, role, and live consumers; no new operation/datatype family.
Regions the plan selects (9): bilinearintrp.$mul$raygentop.v:2874$348, bilinearintrp.$mul$raygentop.v:2875$349, bilinearintrp.$mul$raygentop.v:2876$350, bilinearintrp.$mul$raygentop.v:2877$351, bilinearintrp.$mul$raygentop.v:2878$352, bilinearintrp.$mul$raygentop.v:2879$353, bilinearintrp.$mul$raygentop.v:2880$354, bilinearintrp.$mul$raygentop.v:2881$355, bilinearintrp.$mul$raygentop.v:2882$356
(op 'multiply', datatype int8, consumers ['bilinearintrp']).
APPROVE the plan if it is correct and representative — a legitimate adaptation does not need to
be perfect, only sound. Do NOT demand rewrites for style, minor wording, or hypothetical concerns.
REVISE ONLY for a CONCRETE, specific violation you can name: (a) it changes the computed function
when the tier forbids it; (b) it introduces an operation/datatype absent from the design and not
admitted by the tier; (c) it fabricates terms to match a mode's n_terms (products that did not
exist / do not share a reduction); (d) it wires the mode to constants or a dead sink (mode island).
If none of these apply, APPROVE.
Your FIRST line must be exactly 'APPROVE' or 'REVISE', nothing else. If REVISE, the next lines
must name the specific violation (a/b/c/d) and what to change.
Output rules: no preamble before the verdict line — verify first, then write. Your
verdict is applied automatically and no human reads it, so do not end with a question
or an offer.

--- PLAN ---
I'll read the source first.

Red chain:
- mar0: ax = {8'b0, ul_d} (8-bit ul, delayed), ay = {9'b0, rul_d} (7-bit rul, delayed), bx = 32'b0 → mar0_res (replaces mul $348, ul*rul).
- mar1: ax = {8'b0, vl_d}, ay = {9'b0, rvl_d}, bx = mar0_res[31:0] → mar1_res (replaces mul $349, vl*rvl, plus the first add of line 2884).
- mar2: ax = {8'b0, wl_d}, ay = {9'b0, rwl_d}, bx = mar1_res[31:0] → mar2_res (replaces mul $350, wl*rwl, plus the second add of line 2884).
- assign r = mar2_res[6:0];
Green chain (mag0/1/2): same ax operands ul_d/vl_d/wl_d; ay = {9'b0, gul_d} / {9'b0, gvl_d} / {9'b0, gwl_d}; bx = 0 / mag0_res[31:0] / mag1_res[31:0]; replaces muls $351/$352/$353 and the adds of line 2885; assign g = mag2_res[6:0];
Blue chain (mab0/1/2): ay = {9'b0, bul_d} / {9'b0, bvl_d} / {9'b0, bwl_d}; bx = 0 / mab0_res[31:0] / mab1_res[31:0]; replaces muls $354/$355/$356 and the adds of line 2886; assign b = mab2_res[6:0];

No comb_mult_add_16 input port is left unconnected; the only tied-to-zero ports are the bx of the three chain heads.

PLAN:

Retiming so the fused block sees the right operands. The hard block is combinational, but in the current RTL the products are registered (i1r <= ul*rul, lines 2874–2882, stage 2) and the 3-term reduction is combinational in stage 3 (lines 2884–2886). Multiply and add therefore live in different pipeline stages and cannot be fused as written. Fix by moving the pipeline register from the product side to the operand side, inside the same always @(posedge clk) block at line 2858:
- Delete the nine product registers i1r,i2r,i3r,i1g,i2g,i3g,i1b,i2b,i3b (reg[14:0] decls at lines 2799–2807).
- Add one-cycle delayed copies of the stage-1 operands: ul_d,vl_d,wl_d (reg[7:0]) and rul_d,rvl_d,rwl_d,gul_d,gvl_d,gwl_d,bul_d,bvl_d,bwl_d (reg[6:0]), assigned ul_d <= ul; rul_d <= rul; ... in the same always block. Keep all existing stage-1 assignments (wl <= 8'hFF - u - v, ul <= u, vl <= v, rul <= ru, …) untouched.
- Drive the nine hard blocks from the _d registers and the r/g/b assigns from the chain outputs.
  This is exactly latency-neutral: originally r at cycle N+1 = ul(N)*rul(N) + vl(N)*rvl(N) + wl(N)*rwl(N); after the change r at cycle N+1 = ul_d(N+1)*rul_d(N+1) + … = the same expression. Cycle count, port list, and the selectuv mux stage (lines 2819–2856) are unchanged.
Bit-exactness. ul/vl/wl are 8-bit unsigned, ru..bw are 7-bit unsigned; each product ≤ 255*127 = 32385 fits the existing 15-bit i1r-class regs with no truncation, so nothing is lost by summing at full precision inside the chain. Zero-extension to the signed 16-bit ports is exact (all values ≤ 255 < 2^15), the chain's partial sums are ≤ 3*32385 < 2^17 so bx/result[31:0] never saturates or wraps. The original RTL evaluates i1r+i2r+i3r at 15-bit width and truncates to the 7-bit output; taking result[6:0] yields the identical low 7 bits (both are the true sum mod 2^7), so blr/blg/blb and everything downstream of line 2012 are bit-identical every cycle.
Interface/consumer preservation. bilinearintrp's port list, port widths, clk, and the single instantiation at line 2012 are unchanged; r/g/b stay 7-bit wires. No module above bilinearintrp is touched. No reset exists on these registers today and none is added; X-propagation depth at power-up is unchanged (one register stage before the reduction, as before).
New operations/datatypes: NONE. No adders, shifters, saturation, rounding, or signed/unsigned reinterpretation are introduced — six existing 15-bit adds are absorbed into the bx ports and nine multiplies become the blocks' multipliers. Register count actually drops (135 bits of product registers → 87 bits of operand registers).
Why matmult (raygentop.v:335–343, regions $15–$23) is rejected: although am11..am13 do feed a common sum, the reduction at line 349 adds truncated slices am11[30:15] + am12[30:15] + am13[30:15], i.e. each product is right-shifted by 15 and clipped to 16 bits before the add. comb_mult_add_16 computes ax*ay + bx with no shift between the multiply and the add, so fusing there would change the arithmetic result (different truncation point / different overflow behaviour) and would require inserting new shift-truncate operations — outside T1/T2. The bilinear channels have no intermediate truncation and are the correct representative target.
Risks. (a) Combinational depth: three chained mult-adds per channel form a multiply→add→multiply→add→multiply→add path that is longer than the original single-multiply stage; if the hard block's delay is large this becomes the critical path of bilinearintrp. Mitigation if timing fails: shorten to two blocks per channel (block0 = vl_d*rvl_d + 0, block1 = wl_d*rwl_d + block0, with the ul_d*rul_d term kept as a registered product feeding nothing — but this abandons a fused term, so prefer the 3-chain and only fall back if the reviewer/timing demands it). (b) Nine 64-bit-output blocks for 7-bit results is area-inefficient but is the faithful mapping. (c) Must remember to remove the now-dead i1r..i3b declarations so no latent unconnected-register warnings or accidental readers remain. (d) The retiming must be applied to all three channels consistently, since ul/vl/wl delays are shared across r, g and b.

Read these files in this directory: raygentop.v

response

APPROVE

Verification performed against /work/raygentop.v:

Regions exist and are as described. The nine multiplies are at lines 2874–2882 inside the always @(posedge clk) block of bilinearintrp (module at 2762): i1r <= ul*rul … i3b <= wl*bwl. Operand widths match the plan (ul/vl/wl are reg[7:0], rul..bwl are reg[6:0]), so {8'b0,ul_d} / {9'b0,rul_d} zero-extensions to 16 bits are exact.
(c) shared reduction is real, not fabricated. Lines 2884–2886 are assign r=(i1r+i2r+i3r), g=(i1g+i2g+i3g), b=(i1b+i2b+i3b) — three genuine 3-term sums-of-products. The plan correctly declines to fuse across channels and maps 9 existing products + 6 existing adds onto 9 blocks; nothing invented.
(a) function preserved. The retiming is latency-neutral: originally r after edge k+1 = ul_k*rul_k + vl_k*rvl_k + wl_k*rwl_k; with ul_d<=ul etc. the new combinational chain evaluates the same expression at the same cycle. Original assign r truncates a 15-bit (wrapping) sum to 7 bits; result[6:0] gives the same value mod 2^7. Products ≤ 255*127 = 32385 and partial sums < 2^17, so no saturation/wrap difference in the 32-bit accumulate path. Pipeline stage count (2 regs before the reduction) is unchanged.
(b) no new op/datatype family. Multiply and add both already exist in the region; only wire concatenation (constant zero-extension) is added, which is not an operation family.
(d) not a mode island. Chain outputs drive r/g/b, which drive blr/blg/blb at the sole instantiation on line 2012; blb/blg feed linearmap at line 2011. Only the three chain-head bx ports are tied to 0, which is the ordinary accumulator-init, not a constant-fed island.
matmult rejection is factually correct. Lines 348–350 reduce am11[30:15]+am12[30:15]+am13[30:15], i.e. a shift/truncate between multiply and add, which ax*ay+bx cannot reproduce without adding new operations — a valid T2 reason to prefer bilinearintrp.

The flagged combinational-depth/area issues are timing/QoR concerns, not tier violations, and the plan states them honestly with a fallback. No revision warranted.

tool events 3 recorded, 0 error(s)

bash completed ls /work

input

{
 "command": "ls /work"
}

output

raygentop.v

bash completed sed -n 2750,2900p /work/raygentop.v

input

{
 "command": "sed -n 2750,2900p /work/raygentop.v"
}

output

          3'b110 :
                   begin
                      addr <= start + ({13'b0000000000000, ul[6:2]}) + ({5'b00000, vl, 6'b000000}) ; 
                   end
          3'b111 :
                   begin
                      addr <= start + ({13'b0000000000000, ul[6:2]}) + ({4'b0000, vl, 7'b0000000}) ; 

                   end
       endcase  
    end 
 endmodule
     module bilinearintrp (u01a, u01b, u01c, v01a, v01b, v01c, u10a, u10b, u10c, v10a, v10b, v10c, selectuv, ru, rv, rw, gu, gv, gw, bu, bv, bw, r, g, b, clk);

        input[7:0] u01a; 
        input[7:0] u01b; 
        input[7:0] u01c; 
        input[7:0] v01a; 
        input[7:0] v01b; 
        input[7:0] v01c; 
        input[7:0] u10a; 
        input[7:0] u10b; 
        input[7:0] u10c; 
        input[7:0] v10a; 
        input[7:0] v10b; 
        input[7:0] v10c; 
        input[2:0] selectuv; 
        input[6:0] ru; 
        input[6:0] rv; 
        input[6:0] rw; 
        input[6:0] gu; 
        input[6:0] gv; 
        input[6:0] gw; 
        input[6:0] bu; 
        input[6:0] bv; 
        input[6:0] bw; 
        output[6:0] r; 
        wire[6:0] r;
        output[6:0] g; 
        wire[6:0] g;
        output[6:0] b; 
        wire[6:0] b;
        input clk; 

        reg[7:0] u; 
        reg[7:0] v; 
        reg[7:0] ul; 
        reg[7:0] vl; 
        reg[7:0] wl; 
        reg[14:0] i1b; 
        reg[14:0] i2b; 
        reg[14:0] i3b; 
        reg[14:0] i1g; 
        reg[14:0] i2g; 
        reg[14:0] i3g; 
        reg[14:0] i1r; 
        reg[14:0] i2r; 
        reg[14:0] i3r; 
        reg[6:0] rul; 
        reg[6:0] rvl; 
        reg[6:0] rwl; 
        reg[6:0] gul; 
        reg[6:0] gvl; 
        reg[6:0] gwl; 
        reg[6:0] bul; 
        reg[6:0] bvl; 
        reg[6:0] bwl; 

        always @(selectuv or u01a or u01b or u01c or v01a or v01b or v01c or u10a or 
                 u10b or u10c or v10a or v10b or v10c)
        begin
           case (selectuv)
              3'b000 :
                       begin
                          u = u01a ; 
                          v = v01a ; 
                       end
              3'b001 :
                       begin
                          u = u01b ; 
						 v = v01b ; 
                       end
              3'b010 :
                       begin
                          u = u01c ; 
                          v = v01c ; 
                       end
              3'b100 :
                       begin
                          u = u10a ; 
                          v = v10a ; 
                       end
              3'b101 :
                       begin
                          u = u10b ; 
                          v = v10b ; 
                       end
              3'b110 :
                       begin
                          u = u10c ; 
                          v = v10c ; 
                       end
              default :
                       begin
                          u = 0;
                          v = 0;
                       end
           endcase 
        end 

        always @(posedge clk)
        begin
           wl <= 8'b11111111 - u - v ; 
           ul <= u ; 
           vl <= v ; 
           rul <= ru ; 
           rvl <= rv ; 
           rwl <= rw ; 
           gul <= gu ; 
           gvl <= gv ; 
           gwl <= gw ; 
           bul <= bu ; 
           bvl <= bv ; 
           bwl <= bw ; 
           i1r <= ul * rul ; 
           i2r <= vl * rvl ; 
           i3r <= wl * rwl ; 
           i1g <= ul * gul ; 
           i2g <= vl * gvl ; 
           i3g <= wl * gwl ; 
           i1b <= ul * bul ; 
           i2b <= vl * bvl ; 
           i3b <= wl * bwl ;  
        end 
        assign r = (i1r + i2r + i3r) ;
        assign g = (i1g + i2g + i3g) ;
        assign b = (i1b + i2b + i3b) ;
     endmodule



module fifo3 (datain, writeen, dataout, shiften, globalreset, clk);

    input[18 - 1:0] datain; 
    input writeen; 
    output[18 - 1:0] dataout; 
    wire[18 - 1:0] dataout;
    
…[truncated, 4057 chars total]

bash completed grep -n "bilinearintrp\|comb_mult_add" /work/raygentop.v | head -50; echo ---; sed -n 325,360p /work…

input

{
 "command": "grep -n \"bilinearintrp\\|comb_mult_add\" /work/raygentop.v | head -50; echo ---; sed -n 325,360p /work/raygentop.v; echo ---; sed -n 2000,2020p /work/raygentop.v"
}

output

2012:    bilinearintrp bilinearimp (u01a, u01b, u01c, v01a, v01b, v01c, u10a, u10b, u10c, v10a, v10b, v10c, selectuv, shadedata[41:35], shadedata[62:56], shadedata[20:14], shadedata[34:28], shadedata[55:49], shadedata[13:7], shadedata[27:21], shadedata[48:42], shadedata[6:0], blr, blg, blb, clk); 
2762:     module bilinearintrp (u01a, u01b, u01c, v01a, v01b, v01c, u10a, u10b, u10c, v10a, v10b, v10c, selectuv, ru, rv, rw, gu, gv, gw, bu, bv, bw, r, g, b, clk);
---
    reg[16 + 16 - 1:0] am21; 
    reg[16 + 16 - 1:0] am22; 
    reg[16 + 16 - 1:0] am23; 
    reg[16 + 16 - 1:0] am31; 
    reg[16 + 16 - 1:0] am32; 
    reg[16 + 16 - 1:0] am33; 


    always @(posedge clk)
    begin
       am11 <= Ax * m11 ; 
       am12 <= Ay * m12 ; 
       am13 <= Az * m13 ; 
       am21 <= Ax * m21 ; 
       am22 <= Ay * m22 ; 
       am23 <= Az * m23 ; 
       am31 <= Ax * m31 ; 
       am32 <= Ay * m32 ; 
       am33 <= Az * m33 ; 

       //      Cx <= (am11 + am12 + am13) (`widthA+`widthB-2 downto `widthB-1);
       //      Cy <= (am21 + am22 + am23) (`widthA+`widthB-2 downto `widthB-1);
       //      Cz <= (am31 + am32 + am33) (`widthA+`widthB-2 downto `widthB-1);
       Cx <= (am11[16+16-2:16-1] + am12[16+16-2:16-1] + am13[16+16-2:16-1]) ; 
       Cy <= (am21[16+16-2:16-1] + am22[16+16-2:16-1] + am23[16+16-2:16-1]); 
       Cz <= (am31[16+16-2:16-1] + am32[16+16-2:16-1] + am33[16+16-2:16-1]) ;  
    end 
 endmodule

    
    

module rgconfigmemory (CfgAddr, CfgData, CfgData_Ready, want_CfgData, origx, origy, origz, m11, m12, m13, m21, m22, m23, m31, m32, m33, bkcolour, texinfo, globalreset, clk);


    input[3:0] CfgAddr; 
---

    reg temp_pending01; 
    reg temp_pending10; 
    reg temp_process01; 
    reg temp_texmap; 
    reg[20:0] temp_texinfol; 
    reg[20:0] temp_shadedataa; 
    reg[20:0] temp_shadedatab; 
    reg[20:0] temp_shadedatac; 

    col16to21 col16to21inst (texel, texelselect, texelr, texelg, texelb); 
    linearmap linearmapinst (blb, blg, texinfol[17:0], texeladdr, texelselect, texinfol[20:18], lmenable, clk); 
    bilinearintrp bilinearimp (u01a, u01b, u01c, v01a, v01b, v01c, u10a, u10b, u10c, v10a, v10b, v10c, selectuv, shadedata[41:35], shadedata[62:56], shadedata[20:14], shadedata[34:28], shadedata[55:49], shadedata[13:7], shadedata[27:21], shadedata[48:42], shadedata[6:0], blr, blg, blb, clk); 
    fifo3 fifo3insta (addr, as01, addrout01, shiften01, globalreset, clk); 
    fifo3 fifo3instb (addr, as10, addrout10, shiften10, globalreset, clk); 
    assign hita = (hit01a & process01) | (hit10a & ~process01) ;
    assign hitb = (hit01b & process01) | (hit10b & ~process01) ;
    assign hitc = (hit01c & process01) | (hit10c & ~process01) ;
    assign texaddr = shadedata[59:56] ;
    assign shiften01 = temp_shiften01;
    assign shiften10 = temp_shiften10;

Call 3 · editor · anthropic/claude-opus-5 · ok in 18 · out 4311 · reasoning 0 · cache read 176952 · cache write 17812 · 68.2 s

prompt

1 paragraph break restored by the export, where the recorder joined text blocks with no separator.

Edit raygentop.v in this directory. Local restructuring: re-express the region (e.g. a multiply array + adder tree as a fused sum-of-products) to reach the mode; preserve the region's function and role, keep the rest of the design unchanged, wire the mode's real consumers.

Goal: rewrite the RTL so the hard-block mode 'comb_mult_add_16_mode' is exercised in the packed netlist,
doing real work, while preserving the design's behaviour and role.
Tier: T2

Hard-block primitive to instantiate: comb_mult_add_16 (precision INT16)
computes: out = ax*ay + bx
input ports: ax[16], ay[16], bx[32]
output ports: result[64]
arithmetic: the block's operands and result are signed two's complement. A design operand narrower than its port must be widened to the port width: zero-extended if the design treats it as unsigned, sign-extended if signed. An unsigned design operand as wide as its port has no exact representation on this block.
timing: the block is combinational; result is valid in the same cycle the inputs are applied (no clock port).
Wire EVERY operand of the fused region onto the input ports (name them exactly as above); drive the region's real consumer from the output port. Tie unused term ports to 0. Do not leave input ports unconnected.

Regions selected by the approved plan: 9 — bilinearintrp.$mul$raygentop.v:2874$348, bilinearintrp.$mul$raygentop.v:2875$349, bilinearintrp.$mul$raygentop.v:2876$350, bilinearintrp.$mul$raygentop.v:2877$351, bilinearintrp.$mul$raygentop.v:2878$352, bilinearintrp.$mul$raygentop.v:2879$353, bilinearintrp.$mul$raygentop.v:2880$354, bilinearintrp.$mul$raygentop.v:2881$355, bilinearintrp.$mul$raygentop.v:2882$356. They already feed the common reduction 'The three per-channel barycentric dot products in bilinearintrp (raygentop.v:2762): assign r = (i1r + i2r + i3r) (line 2884), assign g = (i1g + i2g + i3g) (2885), assign b = (i1b + i2b + i3b) (2886) — i.e. r/g/b, driving blr/blg/blb at the instantiation on line 2012. Each channel is one 3-term sum-of-products u*cu + v*cv + w*cw; the three channels are three separate reductions and are NOT fused with each other.'. Each 'comb_mult_add_16_mode' block fuses 1 product term(s); the plan below states how the 9 regions map onto block instances. Fuse only these existing terms; do not invent new ones.
Rules: edit Verilog source only; preserve the module's live inputs/outputs and its downstream
consumers; do not introduce operations or datatypes absent from the design unless this tier
admits a variant; keep the surrounding design unchanged for T1/T2. Do not fabricate terms merely
to match a mode's n_terms — that is not representative.
Output rules: your edit is verified automatically and no human reads this, so do not
end with a question or an offer; state what you changed and stop.

Follow this approved plan:
I'll read the source first.

Red chain:
- mar0: ax = {8'b0, ul_d} (8-bit ul, delayed), ay = {9'b0, rul_d} (7-bit rul, delayed), bx = 32'b0 → mar0_res (replaces mul $348, ul*rul).
- mar1: ax = {8'b0, vl_d}, ay = {9'b0, rvl_d}, bx = mar0_res[31:0] → mar1_res (replaces mul $349, vl*rvl, plus the first add of line 2884).
- mar2: ax = {8'b0, wl_d}, ay = {9'b0, rwl_d}, bx = mar1_res[31:0] → mar2_res (replaces mul $350, wl*rwl, plus the second add of line 2884).
- assign r = mar2_res[6:0];
Green chain (mag0/1/2): same ax operands ul_d/vl_d/wl_d; ay = {9'b0, gul_d} / {9'b0, gvl_d} / {9'b0, gwl_d}; bx = 0 / mag0_res[31:0] / mag1_res[31:0]; replaces muls $351/$352/$353 and the adds of line 2885; assign g = mag2_res[6:0];
Blue chain (mab0/1/2): ay = {9'b0, bul_d} / {9'b0, bvl_d} / {9'b0, bwl_d}; bx = 0 / mab0_res[31:0] / mab1_res[31:0]; replaces muls $354/$355/$356 and the adds of line 2886; assign b = mab2_res[6:0];

No comb_mult_add_16 input port is left unconnected; the only tied-to-zero ports are the bx of the three chain heads.

PLAN:

Retiming so the fused block sees the right operands. The hard block is combinational, but in the current RTL the products are registered (i1r <= ul*rul, lines 2874–2882, stage 2) and the 3-term reduction is combinational in stage 3 (lines 2884–2886). Multiply and add therefore live in different pipeline stages and cannot be fused as written. Fix by moving the pipeline register from the product side to the operand side, inside the same always @(posedge clk) block at line 2858:
- Delete the nine product registers i1r,i2r,i3r,i1g,i2g,i3g,i1b,i2b,i3b (reg[14:0] decls at lines 2799–2807).
- Add one-cycle delayed copies of the stage-1 operands: ul_d,vl_d,wl_d (reg[7:0]) and rul_d,rvl_d,rwl_d,gul_d,gvl_d,gwl_d,bul_d,bvl_d,bwl_d (reg[6:0]), assigned ul_d <= ul; rul_d <= rul; ... in the same always block. Keep all existing stage-1 assignments (wl <= 8'hFF - u - v, ul <= u, vl <= v, rul <= ru, …) untouched.
- Drive the nine hard blocks from the _d registers and the r/g/b assigns from the chain outputs.
  This is exactly latency-neutral: originally r at cycle N+1 = ul(N)*rul(N) + vl(N)*rvl(N) + wl(N)*rwl(N); after the change r at cycle N+1 = ul_d(N+1)*rul_d(N+1) + … = the same expression. Cycle count, port list, and the selectuv mux stage (lines 2819–2856) are unchanged.
Bit-exactness. ul/vl/wl are 8-bit unsigned, ru..bw are 7-bit unsigned; each product ≤ 255*127 = 32385 fits the existing 15-bit i1r-class regs with no truncation, so nothing is lost by summing at full precision inside the chain. Zero-extension to the signed 16-bit ports is exact (all values ≤ 255 < 2^15), the chain's partial sums are ≤ 3*32385 < 2^17 so bx/result[31:0] never saturates or wraps. The original RTL evaluates i1r+i2r+i3r at 15-bit width and truncates to the 7-bit output; taking result[6:0] yields the identical low 7 bits (both are the true sum mod 2^7), so blr/blg/blb and everything downstream of line 2012 are bit-identical every cycle.
Interface/consumer preservation. bilinearintrp's port list, port widths, clk, and the single instantiation at line 2012 are unchanged; r/g/b stay 7-bit wires. No module above bilinearintrp is touched. No reset exists on these registers today and none is added; X-propagation depth at power-up is unchanged (one register stage before the reduction, as before).
New operations/datatypes: NONE. No adders, shifters, saturation, rounding, or signed/unsigned reinterpretation are introduced — six existing 15-bit adds are absorbed into the bx ports and nine multiplies become the blocks' multipliers. Register count actually drops (135 bits of product registers → 87 bits of operand registers).
Why matmult (raygentop.v:335–343, regions $15–$23) is rejected: although am11..am13 do feed a common sum, the reduction at line 349 adds truncated slices am11[30:15] + am12[30:15] + am13[30:15], i.e. each product is right-shifted by 15 and clipped to 16 bits before the add. comb_mult_add_16 computes ax*ay + bx with no shift between the multiply and the add, so fusing there would change the arithmetic result (different truncation point / different overflow behaviour) and would require inserting new shift-truncate operations — outside T1/T2. The bilinear channels have no intermediate truncation and are the correct representative target.
Risks. (a) Combinational depth: three chained mult-adds per channel form a multiply→add→multiply→add→multiply→add path that is longer than the original single-multiply stage; if the hard block's delay is large this becomes the critical path of bilinearintrp. Mitigation if timing fails: shorten to two blocks per channel (block0 = vl_d*rvl_d + 0, block1 = wl_d*rwl_d + block0, with the ul_d*rul_d term kept as a registered product feeding nothing — but this abandons a fused term, so prefer the 3-chain and only fall back if the reviewer/timing demands it). (b) Nine 64-bit-output blocks for 7-bit results is area-inefficient but is the faithful mapping. (c) Must remember to remove the now-dead i1r..i3b declarations so no latent unconnected-register warnings or accidental readers remain. (d) The retiming must be applied to all three channels consistently, since ul/vl/wl delays are shared across r, g and b.

Work iteratively IN THIS SESSION: after each edit, run bash check.sh raygentop.v and read its output; if it does not synthesize, fix the RTL and check again. Do NOT run place-and-route or any VTR/vpr command — that is verified separately. Stop when check.sh reports it synthesizes cleanly and its cell census shows the intended arithmetic. Then state what you changed. You are one step of an automated pipeline: your edit is verified automatically and no human reads this, so do not end with a question or an offer.

response

2 paragraph breaks restored by the export, where the recorder joined text blocks with no separator.

I'll start by reading the relevant source region.

No comb_mult_add_16 declaration exists yet. Let me apply the edit.

Done. Changes in /work/raygentop.v, all inside bilinearintrp (line 2762) plus one new blackbox declaration:

Retimed the pipeline so multiply and add live in the same stage. Deleted the nine 15-bit product registers i1r,i2r,i3r,i1g,i2g,i3g,i1b,i2b,i3b and the nine registered multiplies (i1r <= ul*rul; …, old lines 2874–2882). Added one-cycle delayed operand registers ul_d,vl_d,wl_d (8-bit) and rul_d,rvl_d,rwl_d,gul_d,gvl_d,gwl_d,bul_d,bvl_d,bwl_d (7-bit), assigned in the same always @(posedge clk) block. Stage-1 assignments (wl <= 8'hFF-u-v, ul <= u, …) and the selectuv mux are untouched. Latency is unchanged: r at cycle N+1 is still ul(N)*rul(N)+vl(N)*rvl(N)+wl(N)*rwl(N).
Nine comb_mult_add_16 instances, three chained per channel, replacing the nine multiplies and the six adds of lines 2884–2886:
- Red: mar0(ax={8'b0,ul_d}, ay={9'b0,rul_d}, bx=32'b0) → mar1(ax=vl_d, ay=rvl_d, bx=mar0_res[31:0]) → mar2(ax=wl_d, ay=rwl_d, bx=mar1_res[31:0]).
- Green mag0/1/2 and blue mab0/1/2 identically, with gul_d/gvl_d/gwl_d and bul_d/bvl_d/bwl_d on ay.
- Every ax/ay/bx is driven; only the three chain-head bx ports are tied to 0. All operands are unsigned and ≤ 8 bits, so zero-extension to the signed 16-bit ports is exact and partial sums (< 2^17) never wrap bx.
Consumers rewired: assign r = mar2_res[6:0];, assign g = mag2_res[6:0];, assign b = mab2_res[6:0]; — the same low 7 bits the original truncating assigns produced, so blr/blg/blb at the instantiation on line 2012 are bit-identical. Module port list, widths and all other modules unchanged.
Added a (* blackbox *) declaration of comb_mult_add_16 (ax[15:0], ay[15:0], bx[31:0], result[63:0]) so the netlist elaborates.

bash check.sh raygentop.v reports "OK: synthesizes cleanly"; the census shows comb_mult_add_16 9, and a per-module stat of bilinearintrp shows 9 comb_mult_add_16 with zero $mul/$add remaining there (the 9 $mul left in the design are matmult's, deliberately untouched because its reduction adds pre-truncated slices).

tool events 10 recorded, 0 error(s)

bash completed ls /work

input

{
 "command": "ls /work"
}

output

check.sh
raygentop.v

read completed /work/raygentop.v

input

{
 "filePath": "/work/raygentop.v",
 "offset": 2755,
 "limit": 150
}

output

<path>/work/raygentop.v</path>
<type>file</type>
<content>
2755:                    begin
2756:                       addr <= start + ({13'b0000000000000, ul[6:2]}) + ({4'b0000, vl, 7'b0000000}) ; 
2757: 
2758:                    end
2759:        endcase  
2760:     end 
2761:  endmodule
2762:      module bilinearintrp (u01a, u01b, u01c, v01a, v01b, v01c, u10a, u10b, u10c, v10a, v10b, v10c, selectuv, ru, rv, rw, gu, gv, gw, bu, bv, bw, r, g, b, clk);
2763: 
2764:         input[7:0] u01a; 
2765:         input[7:0] u01b; 
2766:         input[7:0] u01c; 
2767:         input[7:0] v01a; 
2768:         input[7:0] v01b; 
2769:         input[7:0] v01c; 
2770:         input[7:0] u10a; 
2771:         input[7:0] u10b; 
2772:         input[7:0] u10c; 
2773:         input[7:0] v10a; 
2774:         input[7:0] v10b; 
2775:         input[7:0] v10c; 
2776:         input[2:0] selectuv; 
2777:         input[6:0] ru; 
2778:         input[6:0] rv; 
2779:         input[6:0] rw; 
2780:         input[6:0] gu; 
2781:         input[6:0] gv; 
2782:         input[6:0] gw; 
2783:         input[6:0] bu; 
2784:         input[6:0] bv; 
2785:         input[6:0] bw; 
2786:         output[6:0] r; 
2787:         wire[6:0] r;
2788:         output[6:0] g; 
2789:         wire[6:0] g;
2790:         output[6:0] b; 
2791:         wire[6:0] b;
2792:         input clk; 
2793: 
2794:         reg[7:0] u; 
2795:         reg[7:0] v; 
2796:         reg[7:0] ul; 
2797:         reg[7:0] vl; 
2798:         reg[7:0] wl; 
2799:         reg[14:0] i1b; 
2800:         reg[14:0] i2b; 
2801:         reg[14:0] i3b; 
2802:         reg[14:0] i1g; 
2803:         reg[14:0] i2g; 
2804:         reg[14:0] i3g; 
2805:         reg[14:0] i1r; 
2806:         reg[14:0] i2r; 
2807:         reg[14:0] i3r; 
2808:         reg[6:0] rul; 
2809:         reg[6:0] rvl; 
2810:         reg[6:0] rwl; 
2811:         reg[6:0] gul; 
2812:         reg[6:0] gvl; 
2813:         reg[6:0] gwl; 
2814:         reg[6:0] bul; 
2815:         reg[6:0] bvl; 
2816:         reg[6:0] bwl; 
2817: 
2818:         always @(selectuv or u01a or u01b or u01c or v01a or v01b or v01c or u10a or 
2819:                  u10b or u10c or v10a or v10b or v10c)
2820:         begin
2821:            case (selectuv)
2822:               3'b000 :
2823:                        begin
2824:                           u = u01a ; 
2825:                           v = v01a ; 
2826:                        end
2827:               3'b001 :
2828:                        begin
2829:                           u = u01b ; 
2830: 						 v = v01b ; 
2831:                        end
2832:               3'b010 :
2833:                        begin
2834:                           u = u01c ; 
2835:                           v = v01c ; 
2836:                        end
2837:               3'b100 :
2838:                        begin
2839:                           u = u10a ; 
2840:                           v = v10a ; 
2841:                        end
2842:               3'b101 :
2843:                        begin
2844:                           u = u10b ; 
2845:                           v = v10b ; 
2846:                        end
2847:               3'b110 :
2848:                        begin
2849:                           u = u10c ; 
2850:                           v = v10c ; 
2851:                        end
2852:               default :
2853:                        begin
2854:                           u = 0;
2855:                           v = 0;
2856:                        end
2857:            endcase 
2858:         end 
2859: 
2860:         always @(posedge clk)
2861:         begin
2862:            wl <= 8'b11111111 - u - v ; 
2863:            ul <= u ; 
2864:            vl <= v ; 
2865:            rul <= ru ; 
2866:            rvl <= rv ; 
2867:            rwl <= rw ; 
2868:            gul <= gu ; 
2869:            gvl <= gv ; 
2870:            gwl <= gw ; 
2871:            bul <= bu ; 
2872:            bvl <= bv ; 
2873:            bwl <= bw ; 
2874:          
…[truncated, 4982 chars total]

read completed /work/check.sh

input

{
 "filePath": "/work/check.sh"
}

output

<path>/work/check.sh</path>
<type>file</type>
<content>
1: #!/usr/bin/env bash
2: # Inner-loop check: syntax + elaboration + cell census. NOT place-and-route.
3: # usage: bash check.sh <file.v>
4: # Runs plain yosys (read_verilog; hierarchy; proc; opt; stat) on the one file: no arch, no
5: # parmys, no hard-block library. Prints one pass/fail line, then the cell census of the whole
6: # design (the last "Number of cells" table yosys prints): soft arithmetic as $mul/$add/$sub,
7: # registers as $dff*/$sdff*, memories as $mem*, muxes as $mux/$pmux, and every instantiated
8: # module by name, which is where a hard-block instantiation such as comb_mult_add_16 shows up
9: # with its instance count.
10: set -u
11: f="${1:?usage: check.sh <file.v>}"
12: out="$(yosys -p "read_verilog $f; hierarchy -auto-top; proc; opt; stat" 2>&1)"
13: rc=$?
14: if [ $rc -ne 0 ]; then
15:   echo "FAIL: does not synthesize (yosys exit $rc)"
16:   echo "$out" | grep -iE 'error|warning' | tail -15
17:   echo "$out" | tail -10
18:   exit 1
19: fi
20: echo "OK: synthesizes cleanly"
21: echo "Cell census (yosys stat, whole design):"
22: echo "$out" | awk '/Number of cells:/{buf=$0 "\n"; on=1; next}
23:                    on && /^[[:space:]]+[$A-Za-z_][^[:space:]]*[[:space:]]+[0-9]+[[:space:]]*$/ {buf=buf $0 "\n"; next}
24:                    on {on=0}
25:                    END{printf "%s", buf}' \
26:   | grep -E 'Number of cells|^[[:space:]]+(\$(mul|add|sub|mem|memrd|memwr|dff|dffe|sdff|sdffe|adff|adffe|mux|pmux)|[A-Za-z_])' || true

(End of file - total 26 lines)
</content>

bash completed grep -n "comb_mult_add_16\|blackbox\|bilinearintrp" /work/raygentop.v | head -40

input

{
 "command": "grep -n \"comb_mult_add_16\\|blackbox\\|bilinearintrp\" /work/raygentop.v | head -40"
}

output

2012:    bilinearintrp bilinearimp (u01a, u01b, u01c, v01a, v01b, v01c, u10a, u10b, u10c, v10a, v10b, v10c, selectuv, shadedata[41:35], shadedata[62:56], shadedata[20:14], shadedata[34:28], shadedata[55:49], shadedata[13:7], shadedata[27:21], shadedata[48:42], shadedata[6:0], blr, blg, blb, clk); 
2762:     module bilinearintrp (u01a, u01b, u01c, v01a, v01b, v01c, u10a, u10b, u10c, v10a, v10b, v10c, selectuv, ru, rv, rw, gu, gv, gw, bu, bv, bw, r, g, b, clk);

edit completed /work/raygentop.v

input

{
 "filePath": "/work/raygentop.v",
 "oldString": "        reg[14:0] i1b; \n        reg[14:0] i2b; \n        reg[14:0] i3b; \n        reg[14:0] i1g; \n        reg[14:0] i2g; \n        reg[14:0] i3g; \n        reg[14:0] i1r; \n        reg[14:0] i2r; \n        reg[14:0] i3r; \n        reg[6:0] rul; ",
 "newString": "        reg[7:0] ul_d; \n        reg[7:0] vl_d; \n        reg[7:0] wl_d; \n        reg[6:0] rul_d; \n        reg[6:0] rvl_d; \n        reg[6:0] rwl_d; \n        reg[6:0] gul_d; \n        reg[6:0] gvl_d; \n        reg[6:0] gwl_d; \n        reg[6:0] bul_d; \n        reg[6:0] bvl_d; \n        reg[6:0] bwl_d; \n        wire[63:0] mar0_res; \n        wire[63:0] mar1_res; \n        wire[63:0] mar2_res; \n        wire[63:0] mag0_res; \n        wire[63:0] mag1_res; \n        wire[63:0] mag2_res; \n        wire[63:0] mab0_res; \n        wire[63:0] mab1_res; \n        wire[63:0] mab2_res; \n        reg[6:0] rul; "
}

output

Edit applied successfully.

edit completed /work/raygentop.v

input

{
 "filePath": "/work/raygentop.v",
 "oldString": "           i1r <= ul * rul ; \n           i2r <= vl * rvl ; \n           i3r <= wl * rwl ; \n           i1g <= ul * gul ; \n           i2g <= vl * gvl ; \n           i3g <= wl * gwl ; \n           i1b <= ul * bul ; \n           i2b <= vl * bvl ; \n           i3b <= wl * bwl ;  \n        end \n        assign r = (i1r + i2r + i3r) ;\n        assign g = (i1g + i2g + i3g) ;\n        assign b = (i1b + i2b + i3b) ;\n     endmodule",
 "newString": "           ul_d <= ul ; \n           vl_d <= vl ; \n           wl_d <= wl ; \n           rul_d <= rul ; \n           rvl_d <= rvl ; \n           rwl_d <= rwl ; \n           gul_d <= gul ; \n           gvl_d <= gvl ; \n           gwl_d <= gwl ; \n           bul_d <= bul ; \n           bvl_d <= bvl ; \n           bwl_d <= bwl ; \n        end \n\n        // Red channel: ul*rul + vl*rvl + wl*rwl, fused as a chain of mult-adds.\n        comb_mult_add_16 mar0 (.ax({8'b0, ul_d}), .ay({9'b0, rul_d}), .bx(32'b0), .result(mar0_res));\n        comb_mult_add_16 mar1 (.ax({8'b0, vl_d}), .ay({9'b0, rvl_d}), .bx(mar0_res[31:0]), .result(mar1_res));\n        comb_mult_add_16 mar2 (.ax({8'b0, wl_d}), .ay({9'b0, rwl_d}), .bx(mar1_res[31:0]), .result(mar2_res));\n\n        // Green channel: ul*gul + vl*gvl + wl*gwl.\n        comb_mult_add_16 mag0 (.ax({8'b0, ul_d}), .ay({9'b0, gul_d}), .bx(32'b0), .result(mag0_res));\n        comb_mult_add_16 mag1 (.ax({8'b0, vl_d}), .ay({9'b0, gvl_d}), .bx(mag0_res[31:0]), .result(mag1_res));\n        comb_mult_add_16 mag2 (.ax({8'b0, wl_d}), .ay({9'b0, gwl_d}), .bx(mag1_res[31:0]), .result(mag2_res));\n\n        // Blue channel: ul*bul + vl*bvl + wl*bwl.\n        comb_mult_add_16 mab0 (.ax({8'b0, ul_d}), .ay({9'b0, bul_d}), .bx(32'b0), .result(mab0_res));\n        comb_mult_add_16 mab1 (.ax({8'b0, vl_d}), .ay({9'b0, bvl_d}), .bx(mab0_res[31:0]), .result(mab1_res));\n        comb_mult_add_16 mab2 (.ax({8'b0, wl_d}), .ay({9'b0, bwl_d}), .bx(mab1_res[31:0]), .result(mab2_res));\n\n        assign r = mar2_res[6:0] ;\n        assign g = mag2_res[6:0] ;\n        assign b = mab2_res[6:0] ;\n     endmodule\n\n     (* blackbox *)\n     module comb_mult_add_16 (ax, ay, bx, result);\n        input[15:0] ax; \n        input[15:0] ay; \n        input[31:0] bx; \n        output[63:0] result; \n     endmodule"
}

output

Edit applied successfully.

bash completed bash check.sh raygentop.v

input

{
 "command": "bash check.sh raygentop.v",
 "workdir": "/work"
}

output

OK: synthesizes cleanly
Cell census (yosys stat, whole design):
   Number of cells:               1551
     $add                           21
     $dff                           41
     $dffe                           4
     $mul                            9
     $mux                          126
     $pmux                          36
     $sdff                          75
     $sdffe                          8
     $sub                            7
     comb_mult_add_16                9
     single_port_ram                 1

bash completed yosys -p "read_verilog raygentop.v; hierarchy -auto-top; proc; opt; stat" 2>&1 | grep -A25 "module .…

input

{
 "command": "yosys -p \"read_verilog raygentop.v; hierarchy -auto-top; proc; opt; stat\" 2>&1 | grep -A25 \"module .bilinearintrp\"",
 "workdir": "/work"
}

output

Running muxtree optimizer on module \bilinearintrp..
Creating internal representation of mux trees.
Evaluating internal representation of mux trees.
Analyzing evaluation results.
Running muxtree optimizer on module \linearmap..
Creating internal representation of mux trees.
Evaluating internal representation of mux trees.
Analyzing evaluation results.
Running muxtree optimizer on module \col16to21..
Creating internal representation of mux trees.
Evaluating internal representation of mux trees.
Analyzing evaluation results.
Running muxtree optimizer on module \resultwriter..
Creating internal representation of mux trees.
Evaluating internal representation of mux trees.
Analyzing evaluation results.
Running muxtree optimizer on module \resultrecieve..
Creating internal representation of mux trees.
Evaluating internal representation of mux trees.
Analyzing evaluation results.
Running muxtree optimizer on module \raygencont..
Creating internal representation of mux trees.
Evaluating internal representation of mux trees.
Analyzing evaluation results.
Running muxtree optimizer on module \raysend..
Creating internal representation of mux trees.
--
Optimizing cells in module \bilinearintrp.
Optimizing cells in module \linearmap.
Optimizing cells in module \col16to21.
Optimizing cells in module \resultwriter.
New ctrl vector for $pmux cell $procmux$1190: $procmux$1371_CMP
New ctrl vector for $pmux cell $procmux$790: { $procmux$1357_CMP $procmux$1408_CMP }
New ctrl vector for $pmux cell $procmux$1268: { $procmux$1409_CMP $procmux$1403_CMP $procmux$1362_CMP $procmux$1361_CMP $procmux$1360_CMP $procmux$1377_CMP $procmux$1402_CMP $procmux$1357_CMP $procmux$1401_CMP $procmux$1376_CMP $procmux$1408_CMP $procmux$1407_CMP $procmux$1371_CMP }
New ctrl vector for $pmux cell $procmux$774: { $procmux$1362_CMP $procmux$1361_CMP }
New ctrl vector for $pmux cell $procmux$1252: $procmux$1371_CMP
New ctrl vector for $pmux cell $procmux$723: $auto$opt_reduce.cc:134:opt_pmux$15143
New ctrl vector for $pmux cell $procmux$1351: $auto$opt_reduce.cc:134:opt_pmux$15145
New ctrl vector for $pmux cell $procmux$706: { $procmux$1357_CMP $procmux$1408_CMP }
New ctrl vector for $pmux cell $procmux$677: { $procmux$1357_CMP $procmux$1408_CMP }
New ctrl vector for $pmux cell $procmux$1175: $procmux$1371_CMP
New ctrl vector for $pmux cell $procmux$660: { $procmux$1362_CMP $procmux$1361_CMP }
New ctrl vector for $pmux cell $procmux$628: { $procmux$1362_CMP $procmux$1361_CMP }
New ctrl vector for $pmux cell $procmux$563: { $procmux$1376_CMP $procmux$1407_CMP }
New ctrl vector for $pmux cell $procmux$1335: { $procmux$1409_CMP $procmux$1408_CMP $procmux$1407_CMP }
New ctrl vector for $pmux cell $procmux$1236: $procmux$1371_CMP
New ctrl vector for $pmux cell $procmux$501: { $auto$opt_reduce.cc:134:opt_pmux$15149 $auto$opt_reduce.cc:134:opt_pmux$15147 }
New ctrl vector for $pmux cell $procmux$463: { $procmux$1376_CMP $procmux$1407_CMP }
New ctrl vector for $pmux cell $procmux$1300: $auto$opt_reduce.cc:134:opt_pmux$15151
New ctrl vector for $pmux cell $procmux$1374: { $procmux$1376_CMP $procmux$1407_CMP }
New ctrl vector for $pmux cell $procmux$1284: $auto$opt_reduce.cc:134:opt_pmux$15153
New ctrl vector for $pmux cell $procmux$1205: $procmux$1371_CMP
Optimizing cells in module \resultwriter.
--
Finding unused cells or wires in module \bilinearintrp..
Finding unused cells or wires in module \linearmap..
Finding unused cells or wires in module \col16to21..
Finding unused cells or wires in module \resultwriter..
Finding unused cells or wires in module \resultrecieve..
Finding unused cells or wires in module \raygencont..
Finding unused cells or wires in module \raysend..
Finding unused cells or wires in module \rgsramcontroller..
Finding unused cells or wires in module \spram21x4..
Finding unused cells or wires in module \rgconfigmemory..
Finding u
…[truncated, 15150 chars total]

bash completed yosys -p "read_verilog raygentop.v; hierarchy -auto-top; proc; opt; stat -top bilinearintrp" 2>&1 | …

input

{
 "command": "yosys -p \"read_verilog raygentop.v; hierarchy -auto-top; proc; opt; stat -top bilinearintrp\" 2>&1 | tail -30",
 "workdir": "/work"
}

output

   Number of public wire bits:      52
   Number of memories:               0
   Number of memory bits:            0
   Number of processes:              0
   Number of cells:                  2
     $dff                            1
     single_port_ram                 1

=== design hierarchy ===

   bilinearintrp                     1

   Number of wires:                 69
   Number of wire bits:            972
   Number of public wires:          61
   Number of public wire bits:     950
   Number of memories:               0
   Number of memory bits:            0
   Number of processes:              0
   Number of cells:                 43
     $dff                           24
     $eq                             5
     $logic_not                      1
     $pmux                           2
     $sub                            2
     comb_mult_add_16                9

End of script. Logfile hash: d134b888c3, CPU: user 0.81s system 0.01s, MEM: 36.41 MB peak
Yosys 0.33 (git sha1 2584903a060)
Time spent: 30% 6x opt_expr (0 sec), 18% 5x opt_merge (0 sec), ...

bash completed grep -n "i1r\|i2r\|i3r\|i1g\|i2g\|i3g\|i1b\|i2b\|i3b" raygentop.v

input

{
 "command": "grep -n \"i1r\\|i2r\\|i3r\\|i1g\\|i2g\\|i3g\\|i1b\\|i2b\\|i3b\" raygentop.v",
 "workdir": "/work"
}

output

(no output)

Call 4 · reviewer:acceptance · anthropic/claude-opus-5 · ok in 10 · out 3997 · reasoning 0 · cache read 73754 · cache write 11856 · 63.1 s

prompt

You are an INDEPENDENT ACCEPTANCE REVIEWER — the gate of record for whether an adapted design is
a LEGITIMATE member of its benchmark suite. You did NOT plan or write this edit. Judge only what
is in front of you. Your verdict is final and fully automated; there is no human backstop, so err
toward rejecting anything you cannot positively ground.

FRAMING — refute by default. Your job is to find why this adaptation is NOT a legitimate suite
member. Assume it is contrived until the evidence shows otherwise. A rewrite that merely "makes
the mode appear in the netlist" is NOT sufficient — the mode must do real work the original
workload actually implied.

This case has already passed the deterministic structural, provenance, and (for T3) evidence
gates — do not re-litigate those mechanically. Your judgement is the legitimacy call they
cannot make: would a real designer of THIS workload ship this, or is it a mode-island / fabricated
dot-product / gratuitous variant dressed up to pass?

REJECT if any of these hold:

(a) FABRICATED TERMS — a fused N-term product/sum aggregates operands that did not genuinely
share a reduction in the original; the "dot product" is manufactured to fill the mode's arity.
(b) MODE ISLAND / DEAD WORK — the mode's result does not flow to the design's real outputs, or
is wired to constants / a sink that the rest of the design ignores.
(c) ROLE BREAK — the adapted region no longer plays the workload role the witness recorded
(e.g. a control-path multiply repurposed as a fake datapath MAC).
(d) UNGROUNDED VARIANT (T3) — the precision/algorithm variant is not the one the cited sibling
design evidences; the adaptation drifts to a workload character the suite does not contain.

ACCEPT if the adaptation is sound: the mapped arithmetic genuinely existed, the fused terms really
shared a reduction, the mode's output drives the original consumers, and the workload role is
preserved. Legitimate adaptation need not be optimal — only real.

You MUST ground your verdict: cite the specific preserved role (from the witness), the real
region(s)/reduction the mode maps onto, and — for T3 — the sibling evidence axis. A verdict you
cannot ground is a REJECT.

--- ADAPTATION UNDER REVIEW ---
Target mode: comb_mult_add_16_mode Tier: T2
Region witness (the 'before'): role 'bilinearintrp', operation 'multiply', datatype int8,
regions ['bilinearintrp.$mul$raygentop.v:2874$348', 'bilinearintrp.$mul$raygentop.v:2875$349', 'bilinearintrp.$mul$raygentop.v:2876$350', 'bilinearintrp.$mul$raygentop.v:2877$351', 'bilinearintrp.$mul$raygentop.v:2878$352', 'bilinearintrp.$mul$raygentop.v:2879$353', 'bilinearintrp.$mul$raygentop.v:2880$354', 'bilinearintrp.$mul$raygentop.v:2881$355', 'bilinearintrp.$mul$raygentop.v:2882$356'], shared reduction 'The three per-channel barycentric dot products in bilinearintrp (raygentop.v:2762): assign r = (i1r + i2r + i3r) (line 2884), assign g = (i1g + i2g + i3g) (2885), assign b = (i1b + i2b + i3b) (2886) — i.e. r/g/b, driving blr/blg/blb at the instantiation on line 2012. Each channel is one 3-term sum-of-products u*cu + v*cv + w*cw; the three channels are three separate reductions and are NOT fused with each other.', downstream consumers ['bilinearintrp'].
Manifest (the 'after'): introduced operations [], introduced datatypes
[], intended consumers ['bilinearintrp'].
Deterministic gates: PASSED. Evidence floor: no variant introduced (T1/T2).
Packed netlist: target mode present = True.

--- EDIT DIFF ---
--- outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/20260914-000233-ef78a2/edit/.pristine/raygentop/raygentop.v 2026-08-16 18:14:11.414163698 -0700
+++ outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/20260914-000233-ef78a2/edit/raygentop/raygentop.v 2026-09-14 00:06:10.607135653 -0700
@@ -2796,15 +2796,27 @@
reg[7:0] ul;
reg[7:0] vl;
reg[7:0] wl;

reg[14:0] i1b;
reg[14:0] i2b;
reg[14:0] i3b;
reg[14:0] i1g;
reg[14:0] i2g;
reg[14:0] i3g;
reg[14:0] i1r;
reg[14:0] i2r;
reg[14:0] i3r;
reg[7:0] ul_d;
reg[7:0] vl_d;
reg[7:0] wl_d;
reg[6:0] rul_d;
reg[6:0] rvl_d;
reg[6:0] rwl_d;
reg[6:0] gul_d;
reg[6:0] gvl_d;
reg[6:0] gwl_d;
reg[6:0] bul_d;
reg[6:0] bvl_d;
reg[6:0] bwl_d;
wire[63:0] mar0_res;
wire[63:0] mar1_res;
wire[63:0] mar2_res;
wire[63:0] mag0_res;
wire[63:0] mag1_res;
wire[63:0] mag2_res;
wire[63:0] mab0_res;
wire[63:0] mab1_res;
wire[63:0] mab2_res;
reg[6:0] rul;
reg[6:0] rvl;
reg[6:0] rwl;
@@ -2871,19 +2883,46 @@
bul <= bu ;
bvl <= bv ;
bwl <= bw ;
i1r <= ul * rul ;
i2r <= vl * rvl ;
i3r <= wl * rwl ;
i1g <= ul * gul ;
i2g <= vl * gvl ;
i3g <= wl * gwl ;
i1b <= ul * bul ;
i2b <= vl * bvl ;
i3b <= wl * bwl ;
ul_d <= ul ;
vl_d <= vl ;
wl_d <= wl ;
rul_d <= rul ;
rvl_d <= rvl ;
rwl_d <= rwl ;
gul_d <= gul ;
gvl_d <= gvl ;
gwl_d <= gwl ;
bul_d <= bul ;
bvl_d <= bvl ;
bwl_d <= bwl ;
end
assign r = (i1r + i2r + i3r) ;
assign g = (i1g + i2g + i3g) ;
assign b = (i1b + i2b + i3b) ;
+
// Red channel: ul*rul + vl*rvl + wl*rwl, fused as a chain of mult-adds.
comb_mult_add_16 mar0 (.ax({8'b0, ul_d}), .ay({9'b0, rul_d}), .bx(32'b0), .result(mar0_res));
comb_mult_add_16 mar1 (.ax({8'b0, vl_d}), .ay({9'b0, rvl_d}), .bx(mar0_res[31:0]), .result(mar1_res));
comb_mult_add_16 mar2 (.ax({8'b0, wl_d}), .ay({9'b0, rwl_d}), .bx(mar1_res[31:0]), .result(mar2_res));
+
// Green channel: ul*gul + vl*gvl + wl*gwl.
comb_mult_add_16 mag0 (.ax({8'b0, ul_d}), .ay({9'b0, gul_d}), .bx(32'b0), .result(mag0_res));
comb_mult_add_16 mag1 (.ax({8'b0, vl_d}), .ay({9'b0, gvl_d}), .bx(mag0_res[31:0]), .result(mag1_res));
comb_mult_add_16 mag2 (.ax({8'b0, wl_d}), .ay({9'b0, gwl_d}), .bx(mag1_res[31:0]), .result(mag2_res));
+
// Blue channel: ul*bul + vl*bvl + wl*bwl.
comb_mult_add_16 mab0 (.ax({8'b0, ul_d}), .ay({9'b0, bul_d}), .bx(32'b0), .result(mab0_res));
comb_mult_add_16 mab1 (.ax({8'b0, vl_d}), .ay({9'b0, bvl_d}), .bx(mab0_res[31:0]), .result(mab1_res));
comb_mult_add_16 mab2 (.ax({8'b0, wl_d}), .ay({9'b0, bwl_d}), .bx(mab1_res[31:0]), .result(mab2_res));
+
assign r = mar2_res[6:0] ;
assign g = mag2_res[6:0] ;
assign b = mab2_res[6:0] ;
endmodule
+
(* blackbox *)
module comb_mult_add_16 (ax, ay, bx, result);
input[15:0] ax;
input[15:0] ay;
input[31:0] bx;
output[63:0] result;
endmodule

Your FIRST line must be exactly 'ACCEPT' or 'REJECT'. Then, on the following lines, state the
grounding (role preserved / real region mapped / sibling evidence) or the specific violation
(a/b/c/d) and what makes it illegitimate.
Output rules: no preamble before the verdict line — examine the file first, then write.
Your verdict is final and applied automatically, so do not end with a question or an
offer.

Read these files in this directory: raygentop.v

response

1 paragraph break restored by the export, where the recorder joined text blocks with no separator.

I'll examine the actual file before rendering a verdict.

Role preserved. bilinearintrp (raygentop.v:2762) remains the barycentric color interpolator. Its outputs r/g/b (raygentop.v:2915-2917) still drive blr/blg/blb at the instantiation on raygentop.v:2012, which feed temp_shadedata{a,b,c} at raygentop.v:2265-2267, 2423-2425, 2482-2484. No mode island: the mult-add results are the module's only output path, and nothing else was inserted between them and the original consumers. Rules out (b).

Real region / real reduction. The witness records nine int8 multiplies ($mul$raygentop.v:2874..2882) grouped into three separate 3-term reductions: r=(i1r+i2r+i3r), g=..., b=.... The edit maps exactly that structure — three independent 3-instance cascades (mar0→mar1→mar2, mag*, mab*), each accumulating ul*rul + vl*rvl + wl*rwl for one channel via the bx addend port. The channels are not cross-fused, which is precisely the constraint the witness flagged. Each fused pair (ul_d, rul_d) is an operand pair that genuinely multiplied together in the original. Rules out (a).

Semantics/pipeline check (independent verification). Original latency: stage-1 regs (ul,rul,…) → stage-2 product regs (i1r<=ul*rul) → combinational 3-input sum → r. The edit replaces the product registers with plain operand-delay registers ul_d/rul_d (raygentop.v:2886-2897) at the same stage, then does multiply+sum combinationally. Operand pairing and cycle latency to r are unchanged (both t+2). Widths: {8'b0,ul_d} and {9'b0,rul_d} are correct zero-extensions of the 8-bit and 7-bit unsigned operands; max chain value 3·(255·127)=97155 fits the 32-bit bx carry, so the 32-bit truncation on the cascade is lossless, and result[6:0] reproduces the original 7-bit truncation of (i1r+i2r+i3r). This is a functionally equivalent remap, not a cosmetic one. bx(32'b0) on the head of each chain is an accumulator seed for term 1 of 3, not a constant sink. The dead i1*/i2*/i3* regs were removed; no orphaned signals remain.

Role break / variant. No datatype or algorithm change (manifest: no introduced operations/datatypes; T2, evidence floor N/A). The region was already a datapath sum-of-products in the shading path, so no control-path repurposing. Rules out (c) and (d).

A designer targeting a 2-input mult_add primitive would cascade three of them per channel exactly this way, since a 3-term dot product cannot be tree-mapped onto single-multiplier blocks. The added combinational depth is a real cost but not a legitimacy defect.

tool events 7 recorded, 0 error(s)

bash completed ls -la /work

input

{
 "command": "ls -la /work"
}

output

total 92
drwx------ 2 samu samu  4096 Sep 14 07:07 .
drwxr-xr-x 9 samu samu   260 Sep 14 07:07 ..
-rw-rw-r-- 1 samu samu 86539 Sep 14 07:06 raygentop.v

bash completed find / -name "raygentop.v" -not -path "*/proc/*" 2>/dev/null

input

{
 "command": "find / -name \"raygentop.v\" -not -path \"*/proc/*\" 2>/dev/null"
}

output

/work/raygentop.v

bash completed grep -n "bilinearintrp" /work/raygentop.v

input

{
 "command": "grep -n \"bilinearintrp\" /work/raygentop.v"
}

output

2012:    bilinearintrp bilinearimp (u01a, u01b, u01c, v01a, v01b, v01c, u10a, u10b, u10c, v10a, v10b, v10c, selectuv, shadedata[41:35], shadedata[62:56], shadedata[20:14], shadedata[34:28], shadedata[55:49], shadedata[13:7], shadedata[27:21], shadedata[48:42], shadedata[6:0], blr, blg, blb, clk); 
2762:     module bilinearintrp (u01a, u01b, u01c, v01a, v01b, v01c, u10a, u10b, u10c, v10a, v10b, v10c, selectuv, ru, rv, rw, gu, gv, gw, bu, bv, bw, r, g, b, clk);

bash completed grep -n "comb_mult_add_16" /work/raygentop.v

input

{
 "command": "grep -n \"comb_mult_add_16\" /work/raygentop.v"
}

output

2901:        comb_mult_add_16 mar0 (.ax({8'b0, ul_d}), .ay({9'b0, rul_d}), .bx(32'b0), .result(mar0_res));
2902:        comb_mult_add_16 mar1 (.ax({8'b0, vl_d}), .ay({9'b0, rvl_d}), .bx(mar0_res[31:0]), .result(mar1_res));
2903:        comb_mult_add_16 mar2 (.ax({8'b0, wl_d}), .ay({9'b0, rwl_d}), .bx(mar1_res[31:0]), .result(mar2_res));
2906:        comb_mult_add_16 mag0 (.ax({8'b0, ul_d}), .ay({9'b0, gul_d}), .bx(32'b0), .result(mag0_res));
2907:        comb_mult_add_16 mag1 (.ax({8'b0, vl_d}), .ay({9'b0, gvl_d}), .bx(mag0_res[31:0]), .result(mag1_res));
2908:        comb_mult_add_16 mag2 (.ax({8'b0, wl_d}), .ay({9'b0, gwl_d}), .bx(mag1_res[31:0]), .result(mag2_res));
2911:        comb_mult_add_16 mab0 (.ax({8'b0, ul_d}), .ay({9'b0, bul_d}), .bx(32'b0), .result(mab0_res));
2912:        comb_mult_add_16 mab1 (.ax({8'b0, vl_d}), .ay({9'b0, bvl_d}), .bx(mab0_res[31:0]), .result(mab1_res));
2913:        comb_mult_add_16 mab2 (.ax({8'b0, wl_d}), .ay({9'b0, bwl_d}), .bx(mab1_res[31:0]), .result(mab2_res));
2921:     module comb_mult_add_16 (ax, ay, bx, result);

read completed /work/raygentop.v

input

{
 "filePath": "/work/raygentop.v",
 "offset": 2755,
 "limit": 180
}

output

<path>/work/raygentop.v</path>
<type>file</type>
<content>
2755:                    begin
2756:                       addr <= start + ({13'b0000000000000, ul[6:2]}) + ({4'b0000, vl, 7'b0000000}) ; 
2757: 
2758:                    end
2759:        endcase  
2760:     end 
2761:  endmodule
2762:      module bilinearintrp (u01a, u01b, u01c, v01a, v01b, v01c, u10a, u10b, u10c, v10a, v10b, v10c, selectuv, ru, rv, rw, gu, gv, gw, bu, bv, bw, r, g, b, clk);
2763: 
2764:         input[7:0] u01a; 
2765:         input[7:0] u01b; 
2766:         input[7:0] u01c; 
2767:         input[7:0] v01a; 
2768:         input[7:0] v01b; 
2769:         input[7:0] v01c; 
2770:         input[7:0] u10a; 
2771:         input[7:0] u10b; 
2772:         input[7:0] u10c; 
2773:         input[7:0] v10a; 
2774:         input[7:0] v10b; 
2775:         input[7:0] v10c; 
2776:         input[2:0] selectuv; 
2777:         input[6:0] ru; 
2778:         input[6:0] rv; 
2779:         input[6:0] rw; 
2780:         input[6:0] gu; 
2781:         input[6:0] gv; 
2782:         input[6:0] gw; 
2783:         input[6:0] bu; 
2784:         input[6:0] bv; 
2785:         input[6:0] bw; 
2786:         output[6:0] r; 
2787:         wire[6:0] r;
2788:         output[6:0] g; 
2789:         wire[6:0] g;
2790:         output[6:0] b; 
2791:         wire[6:0] b;
2792:         input clk; 
2793: 
2794:         reg[7:0] u; 
2795:         reg[7:0] v; 
2796:         reg[7:0] ul; 
2797:         reg[7:0] vl; 
2798:         reg[7:0] wl; 
2799:         reg[7:0] ul_d; 
2800:         reg[7:0] vl_d; 
2801:         reg[7:0] wl_d; 
2802:         reg[6:0] rul_d; 
2803:         reg[6:0] rvl_d; 
2804:         reg[6:0] rwl_d; 
2805:         reg[6:0] gul_d; 
2806:         reg[6:0] gvl_d; 
2807:         reg[6:0] gwl_d; 
2808:         reg[6:0] bul_d; 
2809:         reg[6:0] bvl_d; 
2810:         reg[6:0] bwl_d; 
2811:         wire[63:0] mar0_res; 
2812:         wire[63:0] mar1_res; 
2813:         wire[63:0] mar2_res; 
2814:         wire[63:0] mag0_res; 
2815:         wire[63:0] mag1_res; 
2816:         wire[63:0] mag2_res; 
2817:         wire[63:0] mab0_res; 
2818:         wire[63:0] mab1_res; 
2819:         wire[63:0] mab2_res; 
2820:         reg[6:0] rul; 
2821:         reg[6:0] rvl; 
2822:         reg[6:0] rwl; 
2823:         reg[6:0] gul; 
2824:         reg[6:0] gvl; 
2825:         reg[6:0] gwl; 
2826:         reg[6:0] bul; 
2827:         reg[6:0] bvl; 
2828:         reg[6:0] bwl; 
2829: 
2830:         always @(selectuv or u01a or u01b or u01c or v01a or v01b or v01c or u10a or 
2831:                  u10b or u10c or v10a or v10b or v10c)
2832:         begin
2833:            case (selectuv)
2834:               3'b000 :
2835:                        begin
2836:                           u = u01a ; 
2837:                           v = v01a ; 
2838:                        end
2839:               3'b001 :
2840:                        begin
2841:                           u = u01b ; 
2842: 						 v = v01b ; 
2843:                        end
2844:               3'b010 :
2845:                        begin
2846:                           u = u01c ; 
2847:                           v = v01c ; 
2848:                        end
2849:               3'b100 :
2850:                        begin
2851:                           u = u10a ; 
2852:                           v = v10a ; 
2853:                        end
2854:               3'b101 :
2855:                        begin
2856:                           u = u10b ; 
2857:                           v = v10b ; 
2858:                        end
2859:               3'b110 :
2860:                        begin
2861:                           u = u10c ; 
2862:                           v = v10c ; 
2863:                        end
2864:               default :
2865:                        begin
2866:                           u = 0;
2867:                           v = 0;
2868:                        end
2869:            endcase 
2870:         end 
2871: 
2872:         always
…[truncated, 6732 chars total]

bash completed grep -n "blr\|blg\|blb" /work/raygentop.v

input

{
 "command": "grep -n \"blr\\|blg\\|blb\" /work/raygentop.v"
}

output

1990:    wire[6:0] blr; 
1991:    wire[6:0] blg; 
1992:    wire[6:0] blb; 
2011:    linearmap linearmapinst (blb, blg, texinfol[17:0], texeladdr, texelselect, texinfol[20:18], lmenable, clk); 
2012:    bilinearintrp bilinearimp (u01a, u01b, u01c, v01a, v01b, v01c, u10a, u10b, u10c, v10a, v10b, v10c, selectuv, shadedata[41:35], shadedata[62:56], shadedata[20:14], shadedata[34:28], shadedata[55:49], shadedata[13:7], shadedata[27:21], shadedata[48:42], shadedata[6:0], blr, blg, blb, clk); 
2265:                         temp_shadedataa[6:0] = blb ; 
2266:                         temp_shadedataa[13:7] = blg ; 
2267:                         temp_shadedataa[20:14] = blr ; 
2423:                         temp_shadedatab[6:0] = blb ; 
2424:                         temp_shadedatab[13:7] = blg ; 
2425:                         temp_shadedatab[20:14] = blr ; 
2482:                         temp_shadedatac[6:0] = blb ; 
2483:                         temp_shadedatac[13:7] = blg ; 
2484:                         temp_shadedatac[20:14] = blr ;

bash completed grep -n "i1r\|i2r\|i3r\|i1g\|i1b\|mult_add\|blackbox" /work/raygentop.v

input

{
 "command": "grep -n \"i1r\\|i2r\\|i3r\\|i1g\\|i1b\\|mult_add\\|blackbox\" /work/raygentop.v"
}

output

2901:        comb_mult_add_16 mar0 (.ax({8'b0, ul_d}), .ay({9'b0, rul_d}), .bx(32'b0), .result(mar0_res));
2902:        comb_mult_add_16 mar1 (.ax({8'b0, vl_d}), .ay({9'b0, rvl_d}), .bx(mar0_res[31:0]), .result(mar1_res));
2903:        comb_mult_add_16 mar2 (.ax({8'b0, wl_d}), .ay({9'b0, rwl_d}), .bx(mar1_res[31:0]), .result(mar2_res));
2906:        comb_mult_add_16 mag0 (.ax({8'b0, ul_d}), .ay({9'b0, gul_d}), .bx(32'b0), .result(mag0_res));
2907:        comb_mult_add_16 mag1 (.ax({8'b0, vl_d}), .ay({9'b0, gvl_d}), .bx(mag0_res[31:0]), .result(mag1_res));
2908:        comb_mult_add_16 mag2 (.ax({8'b0, wl_d}), .ay({9'b0, gwl_d}), .bx(mag1_res[31:0]), .result(mag2_res));
2911:        comb_mult_add_16 mab0 (.ax({8'b0, ul_d}), .ay({9'b0, bul_d}), .bx(32'b0), .result(mab0_res));
2912:        comb_mult_add_16 mab1 (.ax({8'b0, vl_d}), .ay({9'b0, bvl_d}), .bx(mab0_res[31:0]), .result(mab1_res));
2913:        comb_mult_add_16 mab2 (.ax({8'b0, wl_d}), .ay({9'b0, bwl_d}), .bx(mab1_res[31:0]), .result(mab2_res));
2920:     (* blackbox *)
2921:     module comb_mult_add_16 (ax, ay, bx, result);

The edit

+60 / −21 lines, schematic pair

From edit.diff in the run dir: the final edited file against the pristine source.

--- outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/20260914-000233-ef78a2/edit/.pristine/raygentop/raygentop.v 2026-08-16 18:14:11.414163698 -0700

+++ outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/20260914-000233-ef78a2/edit/raygentop/raygentop.v 2026-09-14 00:06:10.607135653 -0700

@@ -2796,15 +2796,27 @@

reg[7:0] ul;

reg[7:0] vl;

reg[7:0] wl;

- reg[14:0] i1b;

- reg[14:0] i2b;

- reg[14:0] i3b;

- reg[14:0] i1g;

- reg[14:0] i2g;

- reg[14:0] i3g;

- reg[14:0] i1r;

- reg[14:0] i2r;

- reg[14:0] i3r;

+ reg[7:0] ul_d;

+ reg[7:0] vl_d;

+ reg[7:0] wl_d;

+ reg[6:0] rul_d;

+ reg[6:0] rvl_d;

+ reg[6:0] rwl_d;

+ reg[6:0] gul_d;

+ reg[6:0] gvl_d;

+ reg[6:0] gwl_d;

+ reg[6:0] bul_d;

+ reg[6:0] bvl_d;

+ reg[6:0] bwl_d;

+ wire[63:0] mar0_res;

+ wire[63:0] mar1_res;

+ wire[63:0] mar2_res;

+ wire[63:0] mag0_res;

+ wire[63:0] mag1_res;

+ wire[63:0] mag2_res;

+ wire[63:0] mab0_res;

+ wire[63:0] mab1_res;

+ wire[63:0] mab2_res;

reg[6:0] rul;

reg[6:0] rvl;

reg[6:0] rwl;

@@ -2871,19 +2883,46 @@

bul <= bu ;

bvl <= bv ;

bwl <= bw ;

- i1r <= ul * rul ;

- i2r <= vl * rvl ;

- i3r <= wl * rwl ;

- i1g <= ul * gul ;

- i2g <= vl * gvl ;

- i3g <= wl * gwl ;

- i1b <= ul * bul ;

- i2b <= vl * bvl ;

- i3b <= wl * bwl ;

+ ul_d <= ul ;

+ vl_d <= vl ;

+ wl_d <= wl ;

+ rul_d <= rul ;

+ rvl_d <= rvl ;

+ rwl_d <= rwl ;

+ gul_d <= gul ;

+ gvl_d <= gvl ;

+ gwl_d <= gwl ;

+ bul_d <= bul ;

+ bvl_d <= bvl ;

+ bwl_d <= bwl ;

end

- assign r = (i1r + i2r + i3r) ;

- assign g = (i1g + i2g + i3g) ;

- assign b = (i1b + i2b + i3b) ;

+ // Red channel: ul*rul + vl*rvl + wl*rwl, fused as a chain of mult-adds.

+ comb_mult_add_16 mar0 (.ax({8'b0, ul_d}), .ay({9'b0, rul_d}), .bx(32'b0), .result(mar0_res));

+ comb_mult_add_16 mar1 (.ax({8'b0, vl_d}), .ay({9'b0, rvl_d}), .bx(mar0_res[31:0]), .result(mar1_res));

+ comb_mult_add_16 mar2 (.ax({8'b0, wl_d}), .ay({9'b0, rwl_d}), .bx(mar1_res[31:0]), .result(mar2_res));

+ // Green channel: ul*gul + vl*gvl + wl*gwl.

+ comb_mult_add_16 mag0 (.ax({8'b0, ul_d}), .ay({9'b0, gul_d}), .bx(32'b0), .result(mag0_res));

+ comb_mult_add_16 mag1 (.ax({8'b0, vl_d}), .ay({9'b0, gvl_d}), .bx(mag0_res[31:0]), .result(mag1_res));

+ comb_mult_add_16 mag2 (.ax({8'b0, wl_d}), .ay({9'b0, gwl_d}), .bx(mag1_res[31:0]), .result(mag2_res));

+ // Blue channel: ul*bul + vl*bvl + wl*bwl.

+ comb_mult_add_16 mab0 (.ax({8'b0, ul_d}), .ay({9'b0, bul_d}), .bx(32'b0), .result(mab0_res));

+ comb_mult_add_16 mab1 (.ax({8'b0, vl_d}), .ay({9'b0, bvl_d}), .bx(mab0_res[31:0]), .result(mab1_res));

+ comb_mult_add_16 mab2 (.ax({8'b0, wl_d}), .ay({9'b0, bwl_d}), .bx(mab1_res[31:0]), .result(mab2_res));

+ assign r = mar2_res[6:0] ;

+ assign g = mag2_res[6:0] ;

+ assign b = mab2_res[6:0] ;

+ endmodule

+ (* blackbox *)

+ module comb_mult_add_16 (ax, ay, bx, result);

+ input[15:0] ax;

+ input[15:0] ay;

+ input[31:0] bx;

+ output[63:0] result;

endmodule

Schematic, before the rewrite 17 KB inlined

Drawn from the netlist, not by this export.

Schematic, after the rewrite 17 KB inlined

Drawn from the netlist, not by this export.

Verification

1 editor attempt(s) · recorded per attempt · final: accepted

Recorded. Written by the loop as each editor attempt ended (iterations.json, copied into outcome.json as iteration_log); nothing here is reconstructed.

Editor attempt 1 · accepted 2026-09-14 00:06:46 -0700 → 2026-09-14 00:08:33 -0700

editor call: call 3 · status ok · changed the file: True · diff against pristine non-empty: True · denied/failed tool calls: 0
synthesis-only check: ran · target macro emitted: True · vtr/iter01/synth/raygentop
full VTR flow: ran · completed (packed .net written): True · vtr/iter01/raygentop
blocks packed in target mode: 9
evidence floor (whole-design variants only): passed · no variant introduced (direct swap or restructuring)
acceptance reviewer: accepted [accepted] · call 4
result: accepted — reviewer agent confirmed

checks on the edit

check	result	reason
target mode present in the packed netlist	passed
synthesis and packing agree (macro emitted was packed)	passed
no operations introduced from another family	passed
the block drives real downstream consumers	passed
fused regions declare the shared reduction they feed	passed
a fusion names at least two real regions	passed
restructuring: still feeds the same part of the design	passed
restructuring: datatype family unchanged	passed

PPA of this attempt: dsp 12 · lut 1064 · ff 962 · bram 1 · cpd 12.9298 ns

artifacts: edit/raygentop/raygentop.v · edit.diff

Synthesis-only result (counted from files)

attempt	file	target macro instances
1	`vtr/iter01/synth/raygentop/raygentop.parmys.blif`	9 × `comb_mult_add_16`

Packed netlist (counted from files)

Counted at export time from the .net file(s) in the run dir: occurrences of mode="…" for the target mode, one per packed block in that mode.

attempt	file	target mode present	blocks in target mode
1	`vtr/iter01/raygentop/raygentop.net`	yes	9

Modes recorded in the outcome as used after the edit: comb_mult_add_16_mode

Numbers

PPA recorded · 4 call(s)

PPA as recorded

metric	this run	baseline (current)	delta
DSP blocks	12	6	+6
LUTs	1064	1055	+9
FFs	962	946	+16
BRAM	1	1	+0
critical path (ns)	12.9298	4.84502	+8.085 ns (+166.9%)

Baseline: the unmodified raygentop through the same flow under the current settings regime (channel width 300, device koios_extra_small, seed 1, grid 90 x 90 (koios_extra_small), routed at width 300); measured, 2026-09-12 18:36:16 -0700, from configs/baselines/complexDSP.yaml. A lower delta is better on every row.

Read from the VPR log of editor attempt 1, the last whose flow completed: the accepted variant (outcome.json ppa, ppa_iteration).

Coverage

quantity	value	what it counts
candidate regions offered	18	detected regions handed to the planner (one RTL expression each)
candidate instances	18	those regions times the elaborated instance count of their module
regions selected	9	regions the approved plan names
selected instances	9	selected regions times their module's instance count
terms per block	1	product terms one block of the mode fuses
blocks packed	9	packed blocks in the target mode (editor attempt 1)

Offered and packed are not the same unit: a candidate is a source region, a packed block is an elaborated instance, and one block can fuse several regions (or the editor can chain several blocks for one region), so they are recorded raw rather than as a ratio.

Block counts

source	mode	blocks
`vtr/iter01/raygentop/raygentop.net`	`comb_mult_add_16_mode`	9

Tokens and cost per call

#	role	model	status	in	out	cache read	cache write	steps	tool calls (errors)	seconds	cost $
1	planner	`anthropic/claude-opus-5`	ok	10	9137	59784	24628	5	7 (0)	132.3	0.4123
2	reviewer:plan	`anthropic/claude-opus-5`	ok	8	3182	54767	8304	4	3 (0)	51.1	0.1589
3	editor	`anthropic/claude-opus-5`	ok	18	4311	176952	17812	9	10 (0)	68.2	0.3077
4	reviewer:acceptance	`anthropic/claude-opus-5`	ok	10	3997	73754	11856	5	7 (0)	63.1	0.2110
	total (4 calls)			46	20627	365257	62600			359.5	1.0898

Cost as reported by the gateway per call, summed. Token components are kept separate (uncached input, output, reasoning, cache read, cache write).