raygentop → comb_mult_add_16_mode · 20260914-001612-e388bf

benchadapt adaptation run · record at outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/20260914-001612-e388bf

run id: 20260914-001612-e388bf
started: 2026-09-14 00:16:12 -0700
finished: 2026-09-14 00:21:55 -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 43s (agents 5m 1s, VTR and other 42s) [343.2 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 8496 · reasoning 0 · cache read 69082 · cache write 11431 · 120.9 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 barycentric colour dot-products in bilinearintrp (raygentop.v:2884-2886): r = i1r+i2r+i3r, g = i1g+i2g+i3g, b = i1b+i2b+i3b. Three independent reductions, each fed by exactly three products (ul*rul, vl*rvl, wl*rwl and the g/b analogues). Products are fused ONLY within one colour channel; nothing is fused across r/g/b because those feed distinct module outputs.
MAPPING:
Per colour channel, three comb_mult_add_16 instances chained through bx so that each chain realises one complete weighted sum. All operands are unsigned and strictly narrower than the 16-bit signed ports (ul/vl/wl are 8-bit, rul..bwl are 7-bit), so every operand is zero-extended to 16 bits and is exactly representable as a positive signed value.

RED channel (regions $348/$349/$350):

mac_r0: ax = {8'b0, ul}, ay = {9'b0, rul}, bx = 32'b0 (unused term tied to 0) → result ; take result[31:0] as pr0.
mac_r1: ax = {8'b0, vl}, ay = {9'b0, rvl}, bx = pr0 → result[31:0] as pr1.
mac_r2: ax = {8'b0, wl}, ay = {9'b0, rwl}, bx = pr1 → result[16:0] is the full untruncated dot product sum_r_c.

GREEN channel (regions $351/$352/$353): identical chain mac_g0/1/2 with ay = {9'b0,gul}, {9'b0,gvl}, {9'b0,gwl}; same ax weights ul, vl, wl; mac_g0.bx = 0, mac_g1.bx = mac_g0.result[31:0], mac_g2.bx = mac_g1.result[31:0].

BLUE channel (regions $354/$355/$356): identical chain mac_b0/1/2 with ay = {9'b0,bul}, {9'b0,bvl}, {9'b0,bwl}.

result[63:17] of the final block in each chain is unused (provably zero for these operand ranges); no input port is left dangling.
PLAN:

Keep the bilinearintrp port list (raygentop.v:2762) and the selectuv mux and stage-1 register block (u,v,wl<=255-u-v,ul,vl,rul..bwl) exactly as they are. The hard blocks are driven by the registered signals ul,vl,wl,rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl, which is precisely the set of operands the existing $mul cells already consume.
Instantiate the nine comb_mult_add_16 blocks at module scope (they are combinational and have no clock port) wired as in MAPPING, producing combinational wires sum_r_c, sum_g_c, sum_b_c (17 bits each).
Delete the nine reg[14:0] i1r..i3b declarations and the nine product statements at lines 2874-2882, and replace them inside the same always @(posedge clk) block with sum_r <= sum_r_c; sum_g <= sum_g_c; sum_b <= sum_b_c; where sum_r/g/b are new reg[16:0]. Replace lines 2884-2886 with assign r = sum_r[6:0]; assign g = sum_g[6:0]; assign b = sum_b[6:0]; (widths of r,g,b stay [6:0]).
Cycle-accuracy: today i1r <= ul*rul (nonblocking) latches the pre-edge value of ul/rul, and r is a combinational sum of those regs, i.e. r is valid one cycle after the operand registers are loaded. In the new form the combinational MAC chain also evaluates the pre-edge values of ul/rul, and sum_r latches on the same edge, so r is valid on exactly the same cycle with the same value. Latency, clock, and the register-transfer boundary are unchanged; blr/blg/blb at the instantiation site (raygentop.v:2012) and all downstream consumers see identical waveforms.
Bit-exactness: each product's maximum is 255*127 = 32385, which fits the existing 15-bit i* regs without truncation, so the old result is low7(p1+p2+p3). The fused chain computes the same p1+p2+p3 at full width (max 97155, fits 17 bits) and the output takes the same low 7 bits, so r/g/b are bit-identical for all input combinations, including the selectuv default (u=v=0, wl=255) case.
Introduced operations/datatypes: NONE. No new arithmetic family, no signed/unsigned reinterpretation (all operands zero-extended, all values positive), no change to the module interface or to the 8-bit/7-bit fixed-point encoding.
Rejected alternative: the matmult 3x3 matrix-vector rows (lines 335-343 reducing into Cx/Cy/Cz at 348-350) are also a sum-of-products, but each product is truncated to bits [30:15] before the reduction, so folding two products into one ax*ay+bx changes the result by the carry out of the discarded low 15 bits and would not preserve the function. It is therefore not proposed.
Risks: (a) timing — three chained 16x16 MACs now sit in one clock period where the original design had a multiply stage followed by a separate adder stage, so this path can become the critical path; if it fails closure the mitigation is to fuse only two products per channel (ul*rul + vl*rvl in one block) and keep the third product/add in fabric, which is still bit-exact. (b) resource pressure — nine hard blocks are consumed by one module. (c) mechanical risk of mis-indexing the chained bx taps (result[31:0]) or of leaving the stale i1r..i3b declarations behind, which would create unused-reg or width warnings; both are caught by comparing the pre/post RTL simulation of r, g, b.

tool events 5 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 '280,420p' /work/raygentop.v

input

{
 "command": "sed -n '280,420p' /work/raygentop.v"
}

output

                   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[27:0] temp_origz;
    reg[15:0] temp_m11;
    reg[15:0] temp_m12;
    reg[15:0] temp_m13;
    reg[15:0] temp_m21;
    reg[15:0] temp_m22;
    reg[15:0] temp_m23;
    reg[15:0] temp_m31;
    reg[15:0] temp_m32;
    reg[15:0] temp_m33;
    reg[20:0] temp_bkcolour;

    // <<X-HDL>> Can't find translated component 'spram'. Module name may not match
    spram21x4 spraminst(we, texinfo, CfgData[20:0], clk); 
    assign we = ((CfgData_Ready == 1'b1) & (CfgAddr == 4'b1110)) ? 1'b1 : 1'b0 ;

    always @(posedge clk)
    begin

bash completed sed -n '2790,2930p' /work/raygentop.v

input

{
 "command": "sed -n '2790,2930p' /work/raygentop.v"
}

output

        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;
    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>=330 && NR<=350 {printf "%d: %s\n", NR, $0}' /work/raygentop.v; echo ---; awk 'NR>=2870 && N…

input

{
 "command": "awk 'NR>=330 && NR<=350 {printf \"%d: %s\\n\", NR, $0}' /work/raygentop.v; echo ---; awk 'NR>=2870 && NR<=2886 {printf \"%d: %s\\n\", NR, $0}' /work/raygentop.v"
}

output

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

bash completed awk 'NR>=2755 && NR<=2795 {printf "%d: %s\n", NR, $0}' /work/raygentop.v; echo ---INST---; grep -n "…

input

{
 "command": "awk 'NR>=2755 && NR<=2795 {printf \"%d: %s\\n\", NR, $0}' /work/raygentop.v; echo ---INST---; grep -n \"bilinearintrp\\|bilinear\" /work/raygentop.v"
}

output

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; 
---INST---
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);

Call 2 · reviewer:plan · anthropic/claude-opus-5 · ok in 6 · out 2378 · reasoning 0 · cache read 39670 · cache write 9552 · 41.0 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 channel (regions $348/$349/$350):

mac_r0: ax = {8'b0, ul}, ay = {9'b0, rul}, bx = 32'b0 (unused term tied to 0) → result ; take result[31:0] as pr0.
mac_r1: ax = {8'b0, vl}, ay = {9'b0, rvl}, bx = pr0 → result[31:0] as pr1.
mac_r2: ax = {8'b0, wl}, ay = {9'b0, rwl}, bx = pr1 → result[16:0] is the full untruncated dot product sum_r_c.

BLUE channel (regions $354/$355/$356): identical chain mac_b0/1/2 with ay = {9'b0,bul}, {9'b0,bvl}, {9'b0,bwl}.

result[63:17] of the final block in each chain is unused (provably zero for these operand ranges); no input port is left dangling.
PLAN:

Keep the bilinearintrp port list (raygentop.v:2762) and the selectuv mux and stage-1 register block (u,v,wl<=255-u-v,ul,vl,rul..bwl) exactly as they are. The hard blocks are driven by the registered signals ul,vl,wl,rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl, which is precisely the set of operands the existing $mul cells already consume.
Instantiate the nine comb_mult_add_16 blocks at module scope (they are combinational and have no clock port) wired as in MAPPING, producing combinational wires sum_r_c, sum_g_c, sum_b_c (17 bits each).
Delete the nine reg[14:0] i1r..i3b declarations and the nine product statements at lines 2874-2882, and replace them inside the same always @(posedge clk) block with sum_r <= sum_r_c; sum_g <= sum_g_c; sum_b <= sum_b_c; where sum_r/g/b are new reg[16:0]. Replace lines 2884-2886 with assign r = sum_r[6:0]; assign g = sum_g[6:0]; assign b = sum_b[6:0]; (widths of r,g,b stay [6:0]).
Cycle-accuracy: today i1r <= ul*rul (nonblocking) latches the pre-edge value of ul/rul, and r is a combinational sum of those regs, i.e. r is valid one cycle after the operand registers are loaded. In the new form the combinational MAC chain also evaluates the pre-edge values of ul/rul, and sum_r latches on the same edge, so r is valid on exactly the same cycle with the same value. Latency, clock, and the register-transfer boundary are unchanged; blr/blg/blb at the instantiation site (raygentop.v:2012) and all downstream consumers see identical waveforms.
Bit-exactness: each product's maximum is 255*127 = 32385, which fits the existing 15-bit i* regs without truncation, so the old result is low7(p1+p2+p3). The fused chain computes the same p1+p2+p3 at full width (max 97155, fits 17 bits) and the output takes the same low 7 bits, so r/g/b are bit-identical for all input combinations, including the selectuv default (u=v=0, wl=255) case.
Introduced operations/datatypes: NONE. No new arithmetic family, no signed/unsigned reinterpretation (all operands zero-extended, all values positive), no change to the module interface or to the 8-bit/7-bit fixed-point encoding.
Rejected alternative: the matmult 3x3 matrix-vector rows (lines 335-343 reducing into Cx/Cy/Cz at 348-350) are also a sum-of-products, but each product is truncated to bits [30:15] before the reduction, so folding two products into one ax*ay+bx changes the result by the carry out of the discarded low 15 bits and would not preserve the function. It is therefore not proposed.
Risks: (a) timing — three chained 16x16 MACs now sit in one clock period where the original design had a multiply stage followed by a separate adder stage, so this path can become the critical path; if it fails closure the mitigation is to fuse only two products per channel (ul*rul + vl*rvl in one block) and keep the third product/add in fabric, which is still bit-exact. (b) resource pressure — nine hard blocks are consumed by one module. (c) mechanical risk of mis-indexing the chained bx taps (result[31:0]) or of leaving the stale i1r..i3b declarations behind, which would create unused-reg or width warnings; both are caught by comparing the pre/post RTL simulation of r, g, b.

Read these files in this directory: raygentop.v

response

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I'll verify the plan against the source.

APPROVE

Verification against the source (/work/raygentop.v):

Regions exist and share reductions (no fabrication, ¬c): lines 2874–2882 are exactly the nine $mul cells (ul*rul, vl*rvl, wl*rwl, and g/b analogues), and lines 2884–2886 reduce them in three disjoint 3-term sums (r, g, b). The 9→9 mapping (three 3-deep bx chains) matches real products in real reductions; no invented terms, no cross-channel fusion of products that never shared an adder.
Function preserved (¬a): each product max is 255*127 = 32385, fitting the existing reg[14:0] without truncation, so the original output is low7(p1+p2+p3). The full-width chained sum (max 97155, 17 bits) truncated to [6:0] is bit-identical. Register boundary analysis is right: i1r <= ul*rul is nonblocking on registered operands, and moving the multiply to combinational logic with sum_r <= sum_r_c on the same edge yields identical latency and waveforms at r/g/b.
No new op/datatype family (¬b): multiply and add already exist in the region; operands are zero-extended unsigned values that are positive in the signed 16-bit ports; port widths of r/g/b and the module interface are unchanged.
Not a mode island (¬d): ax/ay are driven by the live registered operands ul/vl/wl and rul..bwl; only the chain-head bx is tied to 0, which is the degenerate accumulator-init case, and the final result feeds r/g/b, consumed by bilinearintrp bilinearimp at line 2012 via blr/blg/blb.
The rejected alternative is correctly reasoned: matmult (lines 335–343, reduction at 348–350) truncates am**[30:15] before summing, so fusing there would alter the result; excluding it is right.

Timing/resource concerns raised in the plan are acknowledged risks, not tier violations.

tool events 4 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]

input

{
 "command": "grep -n \"comb_mult_add\\|mult_add\\|dsp\" /work/raygentop.v | head -20; grep -rn \"i1r\\|i2r\\|i3r\\|bilinearintrp\" /work/raygentop.v | head -30"
}

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);
36:    output tm3_sram_adsp; 
37:    wire tm3_sram_adsp;
182:    rgsramcontroller sramcont (rgwant_addr, rgaddr_ready, rgaddrin, rgwant_data, rgdata_ready, rgdatain, rgwant_read, rgread_ready, rgdataout, dirReady, wantDir, sramdatal, address, wantwriteback, writebackack, writebackdata, writebackaddr, fbdata, fbnextscanline, fbdatavalid, fbpage, shadedata, triID, wantshadedata, shadedataready, texeladdr, texel, wanttexel, texelready, tm3_sram_data_in, tm3_sram_data_out, tm3_sram_addr, tm3_sram_we, tm3_sram_oe, tm3_sram_adsp, globalreset, clk);
593:module rgsramcontroller (want_addr, addr_ready, addrin, want_data, data_ready, datain, want_read, read_ready, dataout, dirReady, wantDir, sramdatal, addr, wantwriteback, writebackack, writebackdata, writebackaddr, fbdata, fbnextscanline, fbdatavalid, fbpage, shadedata, triID, wantshadedata, shadedataready, texeladdr, texel, wanttexel, texelready, tm3_sram_data_in, tm3_sram_data_out, tm3_sram_addr, tm3_sram_we, tm3_sram_oe, tm3_sram_adsp, globalreset, clk);
653:    output tm3_sram_adsp; 
654:    reg tm3_sram_adsp;
725:				       tm3_sram_adsp = 1'b0 ; 
790:				       tm3_sram_adsp = 1'b0 ; 
812:				       tm3_sram_adsp = 1'b0 ; 
852:                      tm3_sram_adsp = 1'b0 ; 
866:				       tm3_sram_adsp = 1'b0 ; 
889:				       tm3_sram_adsp = 1'b0 ; 
927:                      tm3_sram_adsp = 1'b0 ; 
937:				       tm3_sram_adsp = 1'b0 ; 
970:				       tm3_sram_adsp = 1'b0 ; 
993:				       tm3_sram_adsp = 1'b0 ; 
1012:				       tm3_sram_adsp = 1'b0 ; 
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);
2805:        reg[14:0] i1r; 
2806:        reg[14:0] i2r; 
2807:        reg[14:0] i3r; 
2874:           i1r <= ul * rul ; 
2875:           i2r <= vl * rvl ; 
2876:           i3r <= wl * rwl ; 
2884:        assign r = (i1r + i2r + i3r) ;

bash completed sed -n '325,355p' /work/raygentop.v; sed -n '2000,2030p' /work/raygentop.v

input

{
 "command": "sed -n '325,355p' /work/raygentop.v; sed -n '2000,2030p' /work/raygentop.v"
}

output

    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

    
    

    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;
    assign write = temp_write;


    always @(posedge clk)
    begin
       if (globalreset == 1'b1)
       begin
          state <= 0 ; 
          pending01 <= 1'b0 ; 
          pending10 <= 1'b0 ;

Call 3 · editor · anthropic/claude-opus-5 · ok in 26 · out 5555 · reasoning 0 · cache read 230937 · cache write 12041 · 82.1 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 barycentric colour dot-products in bilinearintrp (raygentop.v:2884-2886): r = i1r+i2r+i3r, g = i1g+i2g+i3g, b = i1b+i2b+i3b. Three independent reductions, each fed by exactly three products (ul*rul, vl*rvl, wl*rwl and the g/b analogues). Products are fused ONLY within one colour channel; nothing is fused across r/g/b because those feed distinct module outputs.'. 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 channel (regions $348/$349/$350):

mac_r0: ax = {8'b0, ul}, ay = {9'b0, rul}, bx = 32'b0 (unused term tied to 0) → result ; take result[31:0] as pr0.
mac_r1: ax = {8'b0, vl}, ay = {9'b0, rvl}, bx = pr0 → result[31:0] as pr1.
mac_r2: ax = {8'b0, wl}, ay = {9'b0, rwl}, bx = pr1 → result[16:0] is the full untruncated dot product sum_r_c.

BLUE channel (regions $354/$355/$356): identical chain mac_b0/1/2 with ay = {9'b0,bul}, {9'b0,bvl}, {9'b0,bwl}.

result[63:17] of the final block in each chain is unused (provably zero for these operand ranges); no input port is left dangling.
PLAN:

Keep the bilinearintrp port list (raygentop.v:2762) and the selectuv mux and stage-1 register block (u,v,wl<=255-u-v,ul,vl,rul..bwl) exactly as they are. The hard blocks are driven by the registered signals ul,vl,wl,rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl, which is precisely the set of operands the existing $mul cells already consume.
Instantiate the nine comb_mult_add_16 blocks at module scope (they are combinational and have no clock port) wired as in MAPPING, producing combinational wires sum_r_c, sum_g_c, sum_b_c (17 bits each).
Delete the nine reg[14:0] i1r..i3b declarations and the nine product statements at lines 2874-2882, and replace them inside the same always @(posedge clk) block with sum_r <= sum_r_c; sum_g <= sum_g_c; sum_b <= sum_b_c; where sum_r/g/b are new reg[16:0]. Replace lines 2884-2886 with assign r = sum_r[6:0]; assign g = sum_g[6:0]; assign b = sum_b[6:0]; (widths of r,g,b stay [6:0]).
Cycle-accuracy: today i1r <= ul*rul (nonblocking) latches the pre-edge value of ul/rul, and r is a combinational sum of those regs, i.e. r is valid one cycle after the operand registers are loaded. In the new form the combinational MAC chain also evaluates the pre-edge values of ul/rul, and sum_r latches on the same edge, so r is valid on exactly the same cycle with the same value. Latency, clock, and the register-transfer boundary are unchanged; blr/blg/blb at the instantiation site (raygentop.v:2012) and all downstream consumers see identical waveforms.
Bit-exactness: each product's maximum is 255*127 = 32385, which fits the existing 15-bit i* regs without truncation, so the old result is low7(p1+p2+p3). The fused chain computes the same p1+p2+p3 at full width (max 97155, fits 17 bits) and the output takes the same low 7 bits, so r/g/b are bit-identical for all input combinations, including the selectuv default (u=v=0, wl=255) case.
Introduced operations/datatypes: NONE. No new arithmetic family, no signed/unsigned reinterpretation (all operands zero-extended, all values positive), no change to the module interface or to the 8-bit/7-bit fixed-point encoding.
Rejected alternative: the matmult 3x3 matrix-vector rows (lines 335-343 reducing into Cx/Cy/Cz at 348-350) are also a sum-of-products, but each product is truncated to bits [30:15] before the reduction, so folding two products into one ax*ay+bx changes the result by the carry out of the discarded low 15 bits and would not preserve the function. It is therefore not proposed.
Risks: (a) timing — three chained 16x16 MACs now sit in one clock period where the original design had a multiply stage followed by a separate adder stage, so this path can become the critical path; if it fails closure the mitigation is to fuse only two products per channel (ul*rul + vl*rvl in one block) and keep the third product/add in fabric, which is still bit-exact. (b) resource pressure — nine hard blocks are consumed by one module. (c) mechanical risk of mis-indexing the chained bx taps (result[31:0]) or of leaving the stale i1r..i3b declarations behind, which would create unused-reg or width warnings; both are caught by comparing the pre/post RTL simulation of r, g, 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 region of the source.

Now applying the edit.

Bit-exact against the original over 20k random vectors, and check.sh reports clean synthesis.

Changes in raygentop.v, module bilinearintrp only:

Removed the nine soft $mul products (i1r..i3b <= ul*rul etc., old lines 2874-2882) and their reg[14:0] i1r..i3b declarations, plus the three 3-input adder trees at the assign r/g/b statements.
Instantiated nine comb_mult_add_16 hard blocks at module scope (combinational, no clock), three per colour channel, chained through bx so each chain computes one complete barycentric dot product:
- mac_r0/r1/r2: ax = {8'b0,ul}/{8'b0,vl}/{8'b0,wl}, ay = {9'b0,rul}/{9'b0,rvl}/{9'b0,rwl}, bx = 32'b0 → mac_r0_out[31:0] → mac_r1_out[31:0].
- mac_g0/g1/g2 and mac_b0/b1/b2 are identical chains with the g*/b* texel weights.
- Every input port is driven; the only unused term port (bx of each chain head) is tied to 32'b0. All operands are unsigned and narrower than the 16-bit ports, so each is zero-extended and is a non-negative signed value.
Added wire[16:0] sum_r_c/sum_g_c/sum_b_c taken from result[16:0] of each chain tail (full untruncated sum, max 97155 < 2^17), registered in the existing always @(posedge clk) block into new reg[16:0] sum_r/sum_g/sum_b, and the outputs are now assign r = sum_r[6:0]; (same for g, b).

Latency and the register-transfer boundary are unchanged: the MACs evaluate the same pre-edge registered operands the old products did, and the sum latches on the same edge, so blr/blg/blb at raygentop.v:2012 and all downstream consumers see identical waveforms. Cell census went from 18 $mul / 27 $add to 9 $mul / 21 $add plus 9 comb_mult_add_16; the remaining soft multipliers are matmult's, which was deliberately not touched (its products are truncated before reduction, so fusing would not be bit-exact). No other module was modified.

tool events 12 recorded, 0 error(s)

bash completed ls /work && cat /work/check.sh

input

{
 "command": "ls /work && cat /work/check.sh"
}

output

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

bash completed sed -n 2755,2900p /work/raygentop.v

input

{
 "command": "sed -n 2755,2900p /work/raygentop.v"
}

output

                   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;
    input shiften; 
    input globalreset; 
    input clk;

input

{
 "command": "cd /work && grep -niE \"comb_mult_add|blackbox|dual_port_ram|single_port_ram|^module \" raygentop.v | head -60"
}

output

193:module delay1x3 (datain, dataout, clk);
298:module matmult (Ax, Ay, Az, m11, m12, m13, m21, m22, m23, m31, m32, m33, Cx, Cy, Cz, clk);
357:module rgconfigmemory (CfgAddr, CfgData, CfgData_Ready, want_CfgData, origx, origy, origz, m11, m12, m13, m21, m22, m23, m31, m32, m33, bkcolour, texinfo, globalreset, clk);
571:single_port_ram new_ram(
593:module rgsramcontroller (want_addr, addr_ready, addrin, want_data, data_ready, datain, want_read, read_ready, dataout, dirReady, wantDir, sramdatal, addr, wantwriteback, writebackack, writebackdata, writebackaddr, fbdata, fbnextscanline, fbdatavalid, fbpage, shadedata, triID, wantshadedata, shadedataready, texeladdr, texel, wanttexel, texelready, tm3_sram_data_in, tm3_sram_data_out, tm3_sram_addr, tm3_sram_we, tm3_sram_oe, tm3_sram_adsp, globalreset, clk);
2891:module fifo3 (datain, writeen, dataout, shiften, globalreset, clk);

bash completed cd /work && bash check.sh raygentop.v

input

{
 "command": "cd /work && bash check.sh raygentop.v"
}

output

OK: synthesizes cleanly
Cell census (yosys stat, whole design):
   Number of cells:               1554
     $add                           27
     $dff                           38
     $dffe                           4
     $mul                           18
     $mux                          126
     $pmux                          36
     $sdff                          75
     $sdffe                          8
     $sub                            7
     single_port_ram                 1

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

input

{
 "command": "cd /work && grep -n \"bilinearintrp\" 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);

edit completed /work/raygentop.v

input

{
 "filePath": "/work/raygentop.v",
 "oldString": "        reg[7:0] wl; \n        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] wl; \n        reg[16:0] sum_r; \n        reg[16:0] sum_g; \n        reg[16:0] sum_b; \n        reg[6:0] rul; "
}

output

Edit applied successfully.

edit completed /work/raygentop.v

input

{
 "filePath": "/work/raygentop.v",
 "oldString": "        reg[6:0] bwl; \n\n        always @(selectuv or u01a",
 "newString": "        reg[6:0] bwl; \n\n        // Fused sum-of-products: the three barycentric colour dot-products are\n        // evaluated on chained comb_mult_add_16 hard blocks (out = ax*ay + bx).\n        // All operands are unsigned and narrower than the 16-bit signed ports, so\n        // each is zero-extended and represents a non-negative signed value.\n        wire[63:0] mac_r0_out; \n        wire[63:0] mac_r1_out; \n        wire[63:0] mac_r2_out; \n        wire[63:0] mac_g0_out; \n        wire[63:0] mac_g1_out; \n        wire[63:0] mac_g2_out; \n        wire[63:0] mac_b0_out; \n        wire[63:0] mac_b1_out; \n        wire[63:0] mac_b2_out; \n        wire[16:0] sum_r_c; \n        wire[16:0] sum_g_c; \n        wire[16:0] sum_b_c; \n\n        comb_mult_add_16 mac_r0 (.ax({8'b0, ul}), .ay({9'b0, rul}), .bx(32'b0), .result(mac_r0_out)); \n        comb_mult_add_16 mac_r1 (.ax({8'b0, vl}), .ay({9'b0, rvl}), .bx(mac_r0_out[31:0]), .result(mac_r1_out)); \n        comb_mult_add_16 mac_r2 (.ax({8'b0, wl}), .ay({9'b0, rwl}), .bx(mac_r1_out[31:0]), .result(mac_r2_out)); \n\n        comb_mult_add_16 mac_g0 (.ax({8'b0, ul}), .ay({9'b0, gul}), .bx(32'b0), .result(mac_g0_out)); \n        comb_mult_add_16 mac_g1 (.ax({8'b0, vl}), .ay({9'b0, gvl}), .bx(mac_g0_out[31:0]), .result(mac_g1_out)); \n        comb_mult_add_16 mac_g2 (.ax({8'b0, wl}), .ay({9'b0, gwl}), .bx(mac_g1_out[31:0]), .result(mac_g2_out)); \n\n        comb_mult_add_16 mac_b0 (.ax({8'b0, ul}), .ay({9'b0, bul}), .bx(32'b0), .result(mac_b0_out)); \n        comb_mult_add_16 mac_b1 (.ax({8'b0, vl}), .ay({9'b0, bvl}), .bx(mac_b0_out[31:0]), .result(mac_b1_out)); \n        comb_mult_add_16 mac_b2 (.ax({8'b0, wl}), .ay({9'b0, bwl}), .bx(mac_b1_out[31:0]), .result(mac_b2_out)); \n\n        assign sum_r_c = mac_r2_out[16:0] ; \n        assign sum_g_c = mac_g2_out[16:0] ; \n        assign sum_b_c = mac_b2_out[16:0] ; \n\n        always @(selectuv or u01a"
}

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) ;",
 "newString": "           sum_r <= sum_r_c ; \n           sum_g <= sum_g_c ; \n           sum_b <= sum_b_c ;  \n        end \n        assign r = sum_r[6:0] ;\n        assign g = sum_g[6:0] ;\n        assign b = sum_b[6:0] ;"
}

output

Edit applied successfully.

bash completed cd /work && bash check.sh raygentop.v

input

{
 "command": "cd /work && bash check.sh raygentop.v"
}

output

OK: synthesizes cleanly
Cell census (yosys stat, whole design):
   Number of cells:               1542
     $add                           21
     $dff                           32
     $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 cd /tmp/opencode && which iverilog

input

{
 "command": "cd /tmp/opencode && which iverilog"
}

output

/usr/bin/iverilog

bash completed cd /tmp/opencode && sed -n '/module bilinearintrp/,/^ endmodule/p' /work/raygentop.v > new_bl.v …

input

{
 "command": "cd /tmp/opencode && sed -n '/module bilinearintrp/,/^     endmodule/p' /work/raygentop.v > new_bl.v && wc -l new_bl.v"
}

output

147 new_bl.v

bash completed cd /tmp/opencode && sed -i 's/module bilinearintrp/module bilinearintrp_new/' new_bl.v && cat > mode…

input

{
 "command": "cd /tmp/opencode && sed -i 's/module bilinearintrp/module bilinearintrp_new/' new_bl.v && cat > model.v <<'EOF'\nmodule comb_mult_add_16 (ax, ay, bx, result);\n  input signed [15:0] ax, ay;\n  input signed [31:0] bx;\n  output signed [63:0] result;\n  assign result = $signed(ax)*$signed(ay) + $signed(bx);\nendmodule\n\nmodule bilinearintrp_old (u01a,u01b,u01c,v01a,v01b,v01c,u10a,u10b,u10c,v10a,v10b,v10c,selectuv,ru,rv,rw,gu,gv,gw,bu,bv,bw,r,g,b,clk);\n input[7:0] u01a,u01b,u01c,v01a,v01b,v01c,u10a,u10b,u10c,v10a,v10b,v10c;\n input[2:0] selectuv; input[6:0] ru,rv,rw,gu,gv,gw,bu,bv,bw;\n output[6:0] r,g,b; input clk;\n reg[7:0] u,v,ul,vl,wl;\n reg[14:0] i1b,i2b,i3b,i1g,i2g,i3g,i1r,i2r,i3r;\n reg[6:0] rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl;\n always @* case (selectuv)\n   3'b000: begin u=u01a; v=v01a; end\n   3'b001: begin u=u01b; v=v01b; end\n   3'b010: begin u=u01c; v=v01c; end\n   3'b100: begin u=u10a; v=v10a; end\n   3'b101: begin u=u10b; v=v10b; end\n   3'b110: begin u=u10c; v=v10c; end\n   default: begin u=0; v=0; end\n endcase\n always @(posedge clk) begin\n   wl <= 8'b11111111 - u - v; ul<=u; vl<=v;\n   rul<=ru; rvl<=rv; rwl<=rw; gul<=gu; gvl<=gv; gwl<=gw; bul<=bu; bvl<=bv; bwl<=bw;\n   i1r<=ul*rul; i2r<=vl*rvl; i3r<=wl*rwl;\n   i1g<=ul*gul; i2g<=vl*gvl; i3g<=wl*gwl;\n   i1b<=ul*bul; i2b<=vl*bvl; i3b<=wl*bwl;\n end\n assign r=(i1r+i2r+i3r); assign g=(i1g+i2g+i3g); assign b=(i1b+i2b+i3b);\nendmodule\n\nmodule tb;\n reg[7:0] a[0:11]; reg[2:0] sel; reg[6:0] c[0:8]; reg clk=0;\n wire[6:0] r0,g0,b0,r1,g1,b1; integer i,errs=0,k;\n bilinearintrp_old  O(a[0],a[1],a[2],a[3],a[4],a[5],a[6],a[7],a[8],a[9],a[10],a[11],sel,c[0],c[1],c[2],c[3],c[4],c[5],c[6],c[7],c[8],r0,g0,b0,clk);\n bilinearintrp_new  N(a[0],a[1],a[2],a[3],a[4],a[5],a[6],a[7],a[8],a[9],a[10],a[11],sel,c[0],c[1],c[2],c[3],c[4],c[5],c[6],c[7],c[8],r1,g1,b1,clk);\n always #5 clk=~clk;\n initial begin\n  for(i=0;i<20000;i=i+1) begin\n    for(k=0;k<12;k=k+1) a[k]=$random;\n    for(k=0;k<9;k=k+1) c[k]=$random;\n    sel=$random;\n    @(posedge clk); #1;\n    if({r0,g0,b0}!=={r1,g1,b1}) begin errs=errs+1; if(errs<5) $display(\"MISMATCH i=%0d %h%h%h vs %h%h%h\",i,r0,g0,b0,r1,g1,b1); end\n  end\n  $display(\"errors=%0d\",errs); $finish;\n end\nendmodule\nEOF\niverilog -o sim model.v new_bl.v && ./sim"
}

output

errors=0
model.v:48: $finish called at 199996 (1s)

Call 4 · reviewer:acceptance · anthropic/claude-opus-5 · ok in 12 · out 3386 · reasoning 0 · cache read 96077 · cache write 11727 · 57.4 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 barycentric colour dot-products in bilinearintrp (raygentop.v:2884-2886): r = i1r+i2r+i3r, g = i1g+i2g+i3g, b = i1b+i2b+i3b. Three independent reductions, each fed by exactly three products (ul*rul, vl*rvl, wl*rwl and the g/b analogues). Products are fused ONLY within one colour channel; nothing is fused across r/g/b because those feed distinct module outputs.', 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/20260914-001612-e388bf/edit/.pristine/raygentop/raygentop.v 2026-08-16 18:14:11.414163698 -0700
+++ outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/20260914-001612-e388bf/edit/raygentop/raygentop.v 2026-09-14 00:19:35.646471038 -0700
@@ -2796,15 +2796,9 @@
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[16:0] sum_r;
reg[16:0] sum_g;
reg[16:0] sum_b;
reg[6:0] rul;
reg[6:0] rvl;
reg[6:0] rwl;
@@ -2815,6 +2809,39 @@
reg[6:0] bvl;
reg[6:0] bwl;
// Fused sum-of-products: the three barycentric colour dot-products are
// evaluated on chained comb_mult_add_16 hard blocks (out = ax*ay + bx).
// All operands are unsigned and narrower than the 16-bit signed ports, so
// each is zero-extended and represents a non-negative signed value.
wire[63:0] mac_r0_out;
wire[63:0] mac_r1_out;
wire[63:0] mac_r2_out;
wire[63:0] mac_g0_out;
wire[63:0] mac_g1_out;
wire[63:0] mac_g2_out;
wire[63:0] mac_b0_out;
wire[63:0] mac_b1_out;
wire[63:0] mac_b2_out;
wire[16:0] sum_r_c;
wire[16:0] sum_g_c;
wire[16:0] sum_b_c;
+
comb_mult_add_16 mac_r0 (.ax({8'b0, ul}), .ay({9'b0, rul}), .bx(32'b0), .result(mac_r0_out));
comb_mult_add_16 mac_r1 (.ax({8'b0, vl}), .ay({9'b0, rvl}), .bx(mac_r0_out[31:0]), .result(mac_r1_out));
comb_mult_add_16 mac_r2 (.ax({8'b0, wl}), .ay({9'b0, rwl}), .bx(mac_r1_out[31:0]), .result(mac_r2_out));
+
comb_mult_add_16 mac_g0 (.ax({8'b0, ul}), .ay({9'b0, gul}), .bx(32'b0), .result(mac_g0_out));
comb_mult_add_16 mac_g1 (.ax({8'b0, vl}), .ay({9'b0, gvl}), .bx(mac_g0_out[31:0]), .result(mac_g1_out));
comb_mult_add_16 mac_g2 (.ax({8'b0, wl}), .ay({9'b0, gwl}), .bx(mac_g1_out[31:0]), .result(mac_g2_out));
+
comb_mult_add_16 mac_b0 (.ax({8'b0, ul}), .ay({9'b0, bul}), .bx(32'b0), .result(mac_b0_out));
comb_mult_add_16 mac_b1 (.ax({8'b0, vl}), .ay({9'b0, bvl}), .bx(mac_b0_out[31:0]), .result(mac_b1_out));
comb_mult_add_16 mac_b2 (.ax({8'b0, wl}), .ay({9'b0, bwl}), .bx(mac_b1_out[31:0]), .result(mac_b2_out));
+
assign sum_r_c = mac_r2_out[16:0] ;
assign sum_g_c = mac_g2_out[16:0] ;
assign sum_b_c = mac_b2_out[16:0] ;
+
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
@@ -2871,19 +2898,13 @@
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 ;
sum_r <= sum_r_c ;
sum_g <= sum_g_c ;
sum_b <= sum_b_c ;
end
assign r = (i1r + i2r + i3r) ;
assign g = (i1g + i2g + i3g) ;
assign b = (i1b + i2b + i3b) ;
assign r = sum_r[6:0] ;
assign g = sum_g[6:0] ;
assign b = sum_b[6:0] ;
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 (witness): bilinearintrp remains the barycentric colour interpolator. The pipeline registers ul/vl/wl (with wl <= 8'hFF - u - v, raygentop.v:2889) and the latched colour weights rul…bwl are untouched; the module still emits 7-bit r/g/b with the same one-cycle latency as the pristine version. No control path was repurposed as a datapath — the selectuv case block (raygentop.v:2845-2885) is byte-identical.

Real reduction mapped (refutes (a)): The witness records three independent 3-term reductions at pristine lines 2884-2886 (r = i1r+i2r+i3r, etc.), each fed by exactly ul*rul, vl*rvl, wl*rwl and the g/b analogues. The MAC chains fuse exactly those operand pairs and nothing else: mac_r0/r1/r2 (raygentop.v:2829-2831) accumulate only the red channel's three products, mac_g* only green, mac_b* only blue. No cross-channel fusion was invented to fill arity, and no foreign operand was dragged into a chain — the arity-3 chain per channel is the reduction that already existed.

Output flow (refutes (b)): mac_*2_out → sum_*_c → registered sum_r/g/b → assign r/g/b = sum_*[6:0] (raygentop.v:2905-2907) → module outputs → blr/blg/blb at the bilinearintrp instantiation (raygentop.v:2012) → temp_shadedata{a,b,c}[20:0] in resultwriter (raygentop.v:2265-2267, 2423-2425, 2482-2484), and blg/blb additionally drive linearmap (raygentop.v:2011). The mode drives the design's real shading outputs; nothing is sunk to a constant. The only constants are the legitimate chain-head addends bx(32'b0).

Semantic fidelity: Original r took the low 7 bits of i1r+i2r+i3r; the new path takes the low 7 bits of the same sum computed in the MAC chain. Max value 3·255·127 = 97155 fits the 17-bit sum_* and the 32-bit bx chain, so no accumulation loss; operands are zero-extended into the signed 16-bit ports ({8'b0,ul}, {9'b0,rul} — widths correct), keeping all values non-negative. Register placement moved from the products to the sum, which is the expected consequence of a combinational mult-add hard block and preserves cycle-for-cycle output timing. All nine i* regs are fully removed with no dangling references.

Tier: T2 — no precision/algorithm variant introduced, so (d) does not apply.

tool events 5 recorded, 0 error(s)

bash completed ls -la /work; find / -name "raygentop.v" -not -path "*/proc/*" 2>/dev/null | head -50

input

{
 "command": "ls -la /work; find / -name \"raygentop.v\" -not -path \"*/proc/*\" 2>/dev/null | head -50"
}

output

total 92
drwx------ 2 samu samu  4096 Sep 14 07:20 .
drwxr-xr-x 9 samu samu   260 Sep 14 07:20 ..
-rw-rw-r-- 1 samu samu 86294 Sep 14 07:19 raygentop.v
/work/raygentop.v

bash completed grep -n "bilinearintrp\|module \|endmodule" /work/raygentop.v | head -80

input

{
 "command": "grep -n \"bilinearintrp\\|module \\|endmodule\" /work/raygentop.v | head -80"
}

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);
190: endmodule
193:module delay1x3 (datain, dataout, clk);
213: endmodule
222: module onlyonecycle (trigger, output_xhdl0, globalreset, clk);
296: endmodule
298:module matmult (Ax, Ay, Az, m11, m12, m13, m21, m22, m23, m31, m32, m33, Cx, Cy, Cz, clk);
352: endmodule
357:module rgconfigmemory (CfgAddr, CfgData, CfgData_Ready, want_CfgData, origx, origy, origz, m11, m12, m13, m21, m22, m23, m31, m32, m33, bkcolour, texinfo, globalreset, clk);
542: endmodule
546: module spram21x4 (we, dataout, datain, clk);
580: endmodule
593:module rgsramcontroller (want_addr, addr_ready, addrin, want_data, data_ready, datain, want_read, read_ready, dataout, dirReady, wantDir, sramdatal, addr, wantwriteback, writebackack, writebackdata, writebackaddr, fbdata, fbnextscanline, fbdatavalid, fbpage, shadedata, triID, wantshadedata, shadedataready, texeladdr, texel, wanttexel, texelready, tm3_sram_data_in, tm3_sram_data_out, tm3_sram_addr, tm3_sram_we, tm3_sram_oe, tm3_sram_adsp, globalreset, clk);
1028: endmodule
1041: module raysend (as, ack, addr, dir, origx, origy, origz, rgData, rgAddr, rgWE, rgAddrValid, rgDone, globalreset, clk, statepeek);
1257: endmodule
1265: module raygencont (go, initcount, busyout, cycles, nextaddr, nas0, nas1, page, dirReady, wantDir, dirIn, addrIn, as, addr, ack, dir, raygroup0, raygroupvalid0, busy0, raygroup1, raygroupvalid1, busy1, globalreset, clk, statepeek);
1615: endmodule
1624: module resultrecieve (valid01, valid10, id01a, id01b, id01c, id10a, id10b, id10c, hit01a, hit01b, hit01c, hit10a, hit10b, hit10c, u01a, u01b, u01c, v01a, v01b, v01c, u10a, u10b, u10c, v10a, v10b, v10c, rgResultData, rgResultReady, rgResultSource, globalreset, clk);
1892: endmodule
1908: module resultwriter (valid01, valid10, id01a, id01b, id01c, id10a, id10b, id10c, hit01a, hit01b, hit01c, hit10a, hit10b, hit10c, u01a, u01b, u01c, v01a, v01b, v01c, u10a, u10b, u10c, v10a, v10b, v10c, addr, as01, as10, bkcolour, shadedata, triID, wantshadedata, shadedataready, texinfo, texaddr, texeladdr, texel, wanttexel, texelready, dataout, addrout, write, ack, globalreset, 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); 
2638: endmodule
2654: module col16to21 (dataline, texelselect, r, g, b);
2691: endmodule
2692: module linearmap (u, v, start, addr, texelselect, factor, enable, clk);
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);
2908:     endmodule
2912:module fifo3 (datain, writeen, dataout, shiften, globalreset, clk);
2998: endmodule

read completed /work/raygentop.v

input

{
 "filePath": "/work/raygentop.v",
 "offset": 2762,
 "limit": 150
}

output

<path>/work/raygentop.v</path>
<type>file</type>
<content>
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[16:0] sum_r; 
2800:         reg[16:0] sum_g; 
2801:         reg[16:0] sum_b; 
2802:         reg[6:0] rul; 
2803:         reg[6:0] rvl; 
2804:         reg[6:0] rwl; 
2805:         reg[6:0] gul; 
2806:         reg[6:0] gvl; 
2807:         reg[6:0] gwl; 
2808:         reg[6:0] bul; 
2809:         reg[6:0] bvl; 
2810:         reg[6:0] bwl; 
2811: 
2812:         // Fused sum-of-products: the three barycentric colour dot-products are
2813:         // evaluated on chained comb_mult_add_16 hard blocks (out = ax*ay + bx).
2814:         // All operands are unsigned and narrower than the 16-bit signed ports, so
2815:         // each is zero-extended and represents a non-negative signed value.
2816:         wire[63:0] mac_r0_out; 
2817:         wire[63:0] mac_r1_out; 
2818:         wire[63:0] mac_r2_out; 
2819:         wire[63:0] mac_g0_out; 
2820:         wire[63:0] mac_g1_out; 
2821:         wire[63:0] mac_g2_out; 
2822:         wire[63:0] mac_b0_out; 
2823:         wire[63:0] mac_b1_out; 
2824:         wire[63:0] mac_b2_out; 
2825:         wire[16:0] sum_r_c; 
2826:         wire[16:0] sum_g_c; 
2827:         wire[16:0] sum_b_c; 
2828: 
2829:         comb_mult_add_16 mac_r0 (.ax({8'b0, ul}), .ay({9'b0, rul}), .bx(32'b0), .result(mac_r0_out)); 
2830:         comb_mult_add_16 mac_r1 (.ax({8'b0, vl}), .ay({9'b0, rvl}), .bx(mac_r0_out[31:0]), .result(mac_r1_out)); 
2831:         comb_mult_add_16 mac_r2 (.ax({8'b0, wl}), .ay({9'b0, rwl}), .bx(mac_r1_out[31:0]), .result(mac_r2_out)); 
2832: 
2833:         comb_mult_add_16 mac_g0 (.ax({8'b0, ul}), .ay({9'b0, gul}), .bx(32'b0), .result(mac_g0_out)); 
2834:         comb_mult_add_16 mac_g1 (.ax({8'b0, vl}), .ay({9'b0, gvl}), .bx(mac_g0_out[31:0]), .result(mac_g1_out)); 
2835:         comb_mult_add_16 mac_g2 (.ax({8'b0, wl}), .ay({9'b0, gwl}), .bx(mac_g1_out[31:0]), .result(mac_g2_out)); 
2836: 
2837:         comb_mult_add_16 mac_b0 (.ax({8'b0, ul}), .ay({9'b0, bul}), .bx(32'b0), .result(mac_b0_out)); 
2838:         comb_mult_add_16 mac_b1 (.ax({8'b0, vl}), .ay({9'b0, bvl}), .bx(mac_b0_out[31:0]), .result(mac_b1_out)); 
2839:         comb_mult_add_16 mac_b2 (.ax({8'b0, wl}), .ay({9'b0, bwl}), .bx(mac_b1_out[31:0]), .result(mac_b2_out)); 
2840: 
2841:         assign sum_r_c = mac_r2_out[16:0] ; 
2842:         assign sum_g_c = mac_g2_out[16:0] ; 
2843:         assign sum_b_c = mac_b2_out[16:0] ; 
2844: 
2845:         always @(selectuv or u01a or u01b or u01c or v01a or v01b or v01c or u10a or 
2846:                  u10b or u10c or v10a or v10b or v10c)
2847:         begin
2848:            case (selectuv)
2849:               3'b000 :
2850:                        begin
2851:                           u = u01a ; 
2852:                          
…[truncated, 5970 chars total]

input

{
 "command": "grep -n \"blr\\|blg\\|blb\\|comb_mult_add_16\\|wire\\[63:0\\]\" /work/raygentop.v | head -40"
}

output

15:    wire[63:0] rgdataout;
26:    wire[63:0] tm3_sram_data_in;
28:    wire[63:0] tm3_sram_data_out;
29:    wire[63:0] tm3_sram_data_xhdl0;
41:    wire[63:0] fbdata;
121:    wire[63:0] writebackdata; 
126:    wire[63:0] shadedata; 
148:    wire[63:0] texel; 
608:    wire[63:0] dataout;
629:    wire[63:0] shadedata;
637:    wire[63:0] texel;
642:    wire[63:0] tm3_sram_data_in;
644:    wire[63:0] tm3_sram_data_out;
1960:    // PAJ see lower note wire[63:0] dataout;
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 ; 
2813:        // evaluated on chained comb_mult_add_16 hard blocks (out = ax*ay + bx).
2816:        wire[63:0] mac_r0_out; 
2817:        wire[63:0] mac_r1_out; 
2818:        wire[63:0] mac_r2_out; 
2819:        wire[63:0] mac_g0_out; 
2820:        wire[63:0] mac_g1_out; 
2821:        wire[63:0] mac_g2_out; 
2822:        wire[63:0] mac_b0_out; 
2823:        wire[63:0] mac_b1_out; 
2824:        wire[63:0] mac_b2_out; 
2829:        comb_mult_add_16 mac_r0 (.ax({8'b0, ul}), .ay({9'b0, rul}), .bx(32'b0), .result(mac_r0_out)); 
2830:        comb_mult_add_16 mac_r1 (.ax({8'b0, vl}), .ay({9'b0, rvl}), .bx(mac_r0_out[31:0]), .result(mac_r1_out));

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

input

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

output

The edit

+42 / −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/20260914-001612-e388bf/edit/.pristine/raygentop/raygentop.v 2026-08-16 18:14:11.414163698 -0700

+++ outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/20260914-001612-e388bf/edit/raygentop/raygentop.v 2026-09-14 00:19:35.646471038 -0700

@@ -2796,15 +2796,9 @@

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[16:0] sum_r;

+ reg[16:0] sum_g;

+ reg[16:0] sum_b;

reg[6:0] rul;

reg[6:0] rvl;

reg[6:0] rwl;

@@ -2815,6 +2809,39 @@

reg[6:0] bvl;

reg[6:0] bwl;

+ // Fused sum-of-products: the three barycentric colour dot-products are

+ // evaluated on chained comb_mult_add_16 hard blocks (out = ax*ay + bx).

+ // All operands are unsigned and narrower than the 16-bit signed ports, so

+ // each is zero-extended and represents a non-negative signed value.

+ wire[63:0] mac_r0_out;

+ wire[63:0] mac_r1_out;

+ wire[63:0] mac_r2_out;

+ wire[63:0] mac_g0_out;

+ wire[63:0] mac_g1_out;

+ wire[63:0] mac_g2_out;

+ wire[63:0] mac_b0_out;

+ wire[63:0] mac_b1_out;

+ wire[63:0] mac_b2_out;

+ wire[16:0] sum_r_c;

+ wire[16:0] sum_g_c;

+ wire[16:0] sum_b_c;

+ comb_mult_add_16 mac_r0 (.ax({8'b0, ul}), .ay({9'b0, rul}), .bx(32'b0), .result(mac_r0_out));

+ comb_mult_add_16 mac_r1 (.ax({8'b0, vl}), .ay({9'b0, rvl}), .bx(mac_r0_out[31:0]), .result(mac_r1_out));

+ comb_mult_add_16 mac_r2 (.ax({8'b0, wl}), .ay({9'b0, rwl}), .bx(mac_r1_out[31:0]), .result(mac_r2_out));

+ comb_mult_add_16 mac_g0 (.ax({8'b0, ul}), .ay({9'b0, gul}), .bx(32'b0), .result(mac_g0_out));

+ comb_mult_add_16 mac_g1 (.ax({8'b0, vl}), .ay({9'b0, gvl}), .bx(mac_g0_out[31:0]), .result(mac_g1_out));

+ comb_mult_add_16 mac_g2 (.ax({8'b0, wl}), .ay({9'b0, gwl}), .bx(mac_g1_out[31:0]), .result(mac_g2_out));

+ comb_mult_add_16 mac_b0 (.ax({8'b0, ul}), .ay({9'b0, bul}), .bx(32'b0), .result(mac_b0_out));

+ comb_mult_add_16 mac_b1 (.ax({8'b0, vl}), .ay({9'b0, bvl}), .bx(mac_b0_out[31:0]), .result(mac_b1_out));

+ comb_mult_add_16 mac_b2 (.ax({8'b0, wl}), .ay({9'b0, bwl}), .bx(mac_b1_out[31:0]), .result(mac_b2_out));

+ assign sum_r_c = mac_r2_out[16:0] ;

+ assign sum_g_c = mac_g2_out[16:0] ;

+ assign sum_b_c = mac_b2_out[16:0] ;

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

@@ -2871,19 +2898,13 @@

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 ;

+ sum_r <= sum_r_c ;

+ sum_g <= sum_g_c ;

+ sum_b <= sum_b_c ;

end

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

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

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

+ assign r = sum_r[6:0] ;

+ assign g = sum_g[6:0] ;

+ assign b = sum_b[6:0] ;

endmodule

Schematic, before the rewrite 17 KB inlined

Drawn from the netlist, not by this export.

Schematic, after the rewrite 13 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 00:20:17 -0700 → 2026-09-14 00:21:55 -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 1070 · ff 904 · bram 1 · cpd 11.6068 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	1070	1055	+15
FFs	904	946	-42
BRAM	1	1	+0
critical path (ns)	11.6068	4.84502	+6.762 ns (+139.6%)

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	8496	69082	11431	5	5 (0)	120.9	0.3184
2	reviewer:plan	`anthropic/claude-opus-5`	ok	6	2378	39670	9552	3	4 (0)	41.0	0.1390
3	editor	`anthropic/claude-opus-5`	ok	26	5555	230937	12041	13	12 (0)	82.1	0.3297
4	reviewer:acceptance	`anthropic/claude-opus-5`	ok	12	3386	96077	11727	6	5 (0)	57.4	0.2060
	total (4 calls)			54	19815	435766	44751			343.2	0.9932

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