raygentop → comb_mult_add_16_mode · 20260913-002957-033296

benchadapt adaptation run · record at outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/20260913-002957-033296

run id: 20260913-002957-033296
started: 2026-09-13 00:29:57 -0700
finished: 2026-09-13 00:36:52 -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: 6m 54s (agents 6m 12s, VTR and other 42s) [414.3 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: 92c85bc226e0 (clean)
sandbox: not recorded (run made before the agent sandbox existed; its agent calls were not confined)
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: not recorded (runs before 2026-09-13 carry no prompt-set hash)

exported 2026-09-14T18:11:54-07:00

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 6724 · reasoning 0 · cache read 56047 · cache write 20802 · 97.8 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>

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 start by reading the source file to understand the arithmetic regions.

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: three independent barycentric colour reductions inside bilinearintrp: assign r = (i1r+i2r+i3r) (line 2884), assign g = (i1g+i2g+i3g) (2885), assign b = (i1b+i2b+i3b) (2886). Regions $348/$349/$350 fuse only into r; $351/$352/$353 only into g; $354/$355/$356 only into b. No product crosses a channel boundary.
MAPPING:
Red chain (3 chained comb_mult_add_16, all operands zero-extended — every source is unsigned):
R0: ax = {8'b0, ul} ay = {9'b0, rul} bx = 32'b0 -> result r0
R1: ax = {8'b0, vl} ay = {9'b0, rvl} bx = r0[31:0] -> result r1
R2: ax = {8'b0, wl} ay = {9'b0, rwl} bx = r1[31:0] -> result rsum_next = ul*rul + vl*rvl + wl*rwl
Green chain: identical with (ul,gul), (vl,gvl), (wl,gwl); Blue chain: (ul,bul), (vl,bvl), (wl,bwl).
Output: rsum <= rsum_next[14:0] in the existing always @(posedge clk); assign r = rsum[6:0]; (likewise gsum/bsum). No bx port is ever left dangling — the head of each chain is tied to 32'b0, and the unused upper result[63:32] bits are simply not read.
PLAN:

Preserve interface exactly: bilinearintrp's ports (u01a..v10c, selectuv, ru..bw, r, g, b, clk) are untouched, so the instantiation at line 2012 and the consumers of blr/blg/blb (resultwriter, lines 2265-2267 / 2423-2425 / 2482-2484, and linearmap) see identical signals.
Local restructuring (the reason this is T2, not T1): the nine 15-bit product registers i1r..i3b sit between the multiply and the shared add, so the adder cannot be fused without moving that register boundary. Replace them with three 15-bit accumulator registers rsum/gsum/bsum clocked in the same always @(posedge clk) block. The combinational hard-block chains are driven by the already-registered ul/vl/wl and rul..bwl, so the pipeline depth and latency of r/g/b are unchanged (still valid one clock after the operand registers update). All other registers (u, v, ul, vl, wl, the *l weight pipeline, wl <= 8'hFF - u - v) stay as-is.
Bit-exactness argument: each product is at most 255*127 = 32385, which already fits the existing 15-bit i* registers with no truncation, so the original RTL sums full products — unlike matmult, the reduction here is not over truncated slices. The original i1r+i2r+i3r evaluates at 15-bit width and wraps mod 2^15 before the implicit truncation to r[6:0]; taking result[14:0] (then [6:0]) from the 32-bit hard-block sum yields the identical low bits, so r/g/b are bit-identical cycle-for-cycle.
Signedness: all operands are unsigned and strictly narrower than their ports (8-bit ul/vl/wl into ax[16], 7-bit weights into ay[16]), so zero-extension is the exact widening and every product/partial sum stays non-negative and far below the signed 32-bit bx range (max chain value 97155). The "unsigned operand as wide as its port" hazard does not arise.
New operations/datatypes introduced: NONE. Only existing multiplies and their existing shared adds are absorbed into the primitive.
Rejected alternative: matmult ($15..$23). Its products do feed common reductions (Cx/Cy/Cz), but the reduction is over truncated slices am11[30:15] + am12[30:15] + am13[30:15]; sum-of-truncations is not recoverable from the fused full-width sum, so fusing would silently change the computed function. Additionally its operands are full 16-bit unsigned Verilog values, which per the block spec have no exact representation on the signed 16-bit ports. Both are disqualifying.
Risks: (1) the chained bx cascade creates a 3-deep combinational multiplier path on the r/g/b critical path where previously the multipliers were parallel — timing (not function) may degrade; a designer could instead use 2 blocks plus one adder, but the 3-block chain keeps every multiply on the primitive. (2) The removed i1r..i3b registers are dead afterwards and must be deleted to avoid unused-reg lint noise; they have no other readers (verified: only line 2884-2886). (3) Reset behaviour is unchanged — these registers were never reset, so the X-propagation profile at power-up is the same.

tool events 7 recorded, 0 error(s)

bash completed wc -l raygentop.v

input

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

output

2978 raygentop.v

bash completed grep -n "module \|endmodule" raygentop.v

input

{
 "command": "grep -n \"module \\|endmodule\" 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);
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);
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);
2887:     endmodule
2891:module fifo3 (datain, writeen, dataout, shiften, globalreset, clk);
2977: endmodule

read completed /home/samu/dev/llm-hardblocks/benchadapt/outputs/adapt/_scratch/oc_u1lnl0hk/raygentop.v

input

{
 "filePath": "/home/samu/dev/llm-hardblocks/benchadapt/outputs/adapt/_scratch/oc_u1lnl0hk/raygentop.v",
 "offset": 298,
 "limit": 60
}

output

<path>/home/samu/dev/llm-hardblocks/benchadapt/outputs/adapt/_scratch/oc_u1lnl0hk/raygentop.v</path>
<type>file</type>
<content>
298: module matmult (Ax, Ay, Az, m11, m12, m13, m21, m22, m23, m31, m32, m33, Cx, Cy, Cz, clk);
299: 
300:     input[16 - 1:0] Ax; 
301:     input[16 - 1:0] Ay; 
302:     input[16 - 1:0] Az; 
303:     input[16 - 1:0] m11; 
304:     input[16 - 1:0] m12; 
305: 
306:     input[16 - 1:0] m13; 
307:     input[16 - 1:0] m21; 
308:     input[16 - 1:0] m22; 
309:     input[16 - 1:0] m23; 
310:     input[16 - 1:0] m31; 
311:     input[16 - 1:0] m32; 
312:     input[16 - 1:0] m33; 
313:     output[16 - 1:0] Cx; 
314:     reg[16 - 1:0] Cx;
315:     output[16 - 1:0] Cy; 
316:     reg[16 - 1:0] Cy;
317:     output[16 - 1:0] Cz; 
318: 
319:     reg[16 - 1:0] Cz;
320:     input clk; 
321: 
322:     reg[16 + 16 - 1:0] am11; 
323:     reg[16 + 16 - 1:0] am12; 
324:     reg[16 + 16 - 1:0] am13; 
325:     reg[16 + 16 - 1:0] am21; 
326:     reg[16 + 16 - 1:0] am22; 
327:     reg[16 + 16 - 1:0] am23; 
328:     reg[16 + 16 - 1:0] am31; 
329:     reg[16 + 16 - 1:0] am32; 
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]) ;  
351:     end 
352:  endmodule
353: 
354:     
355:     
356: 
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);

(Showing lines 298-357 of 2978. Use offset=358 to continue.)
</content>

read completed /home/samu/dev/llm-hardblocks/benchadapt/outputs/adapt/_scratch/oc_u1lnl0hk/raygentop.v

input

{
 "filePath": "/home/samu/dev/llm-hardblocks/benchadapt/outputs/adapt/_scratch/oc_u1lnl0hk/raygentop.v",
 "offset": 2762,
 "limit": 130
}

output

<path>/home/samu/dev/llm-hardblocks/benchadapt/outputs/adapt/_scratch/oc_u1lnl0hk/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[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:            i1r <= ul * rul ; 
2875:            i2r <= vl * rvl ; 
2876:            i3r <= wl * rwl ; 
2877:            i1g <= ul * gul ; 
2878:            i2g <= vl * gv
…[truncated, 4495 chars total]

bash completed grep -n "bilinearintrp\|i1r\|i2r\|i3r\|i1g\|i1b" raygentop.v; echo ---; grep -n "matmult\b" raygento…

input

{
 "command": "grep -n \"bilinearintrp\\|i1r\\|i2r\\|i3r\\|i1g\\|i1b\" raygentop.v; echo ---; grep -n \"matmult\\b\" 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);
2799:        reg[14:0] i1b; 
2802:        reg[14:0] i1g; 
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 ; 
2877:           i1g <= ul * gul ; 
2880:           i1b <= ul * bul ; 
2884:        assign r = (i1r + i2r + i3r) ;
2885:        assign g = (i1g + i2g + i3g) ;
2886:        assign b = (i1b + i2b + i3b) ;
---
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);

input

{
 "command": "grep -n \"bilinearintrp (\\|col16to21\\|\\.r(\\|\\.g(\\|\\.b(\" raygentop.v | head -40"
}

output

2010:    col16to21 col16to21inst (texel, texelselect, texelr, texelg, texelb); 
2644: //      Input file         : G:/jamieson/VERILOG_BENCHMARKS/RAYTRACE/col16to21.vhd
2645: //      Design name        : col16to21
2654: module col16to21 (dataline, texelselect, r, g, b);
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 "blr\|blg\|blb" raygentop.v

input

{
 "command": "grep -n \"blr\\|blg\\|blb\" 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 ;

Call 2 · reviewer:plan · anthropic/claude-opus-5 · ok in 12 · out 2820 · reasoning 0 · cache read 59928 · cache write 14859 · 48.0 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.
Region: bilinearintrp.$mul$raygentop.v:2874$348 (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.

--- PLAN ---
I'll start by reading the source file to understand the arithmetic regions.

Preserve interface exactly: bilinearintrp's ports (u01a..v10c, selectuv, ru..bw, r, g, b, clk) are untouched, so the instantiation at line 2012 and the consumers of blr/blg/blb (resultwriter, lines 2265-2267 / 2423-2425 / 2482-2484, and linearmap) see identical signals.
Local restructuring (the reason this is T2, not T1): the nine 15-bit product registers i1r..i3b sit between the multiply and the shared add, so the adder cannot be fused without moving that register boundary. Replace them with three 15-bit accumulator registers rsum/gsum/bsum clocked in the same always @(posedge clk) block. The combinational hard-block chains are driven by the already-registered ul/vl/wl and rul..bwl, so the pipeline depth and latency of r/g/b are unchanged (still valid one clock after the operand registers update). All other registers (u, v, ul, vl, wl, the *l weight pipeline, wl <= 8'hFF - u - v) stay as-is.
Bit-exactness argument: each product is at most 255*127 = 32385, which already fits the existing 15-bit i* registers with no truncation, so the original RTL sums full products — unlike matmult, the reduction here is not over truncated slices. The original i1r+i2r+i3r evaluates at 15-bit width and wraps mod 2^15 before the implicit truncation to r[6:0]; taking result[14:0] (then [6:0]) from the 32-bit hard-block sum yields the identical low bits, so r/g/b are bit-identical cycle-for-cycle.
Signedness: all operands are unsigned and strictly narrower than their ports (8-bit ul/vl/wl into ax[16], 7-bit weights into ay[16]), so zero-extension is the exact widening and every product/partial sum stays non-negative and far below the signed 32-bit bx range (max chain value 97155). The "unsigned operand as wide as its port" hazard does not arise.
New operations/datatypes introduced: NONE. Only existing multiplies and their existing shared adds are absorbed into the primitive.
Rejected alternative: matmult ($15..$23). Its products do feed common reductions (Cx/Cy/Cz), but the reduction is over truncated slices am11[30:15] + am12[30:15] + am13[30:15]; sum-of-truncations is not recoverable from the fused full-width sum, so fusing would silently change the computed function. Additionally its operands are full 16-bit unsigned Verilog values, which per the block spec have no exact representation on the signed 16-bit ports. Both are disqualifying.
Risks: (1) the chained bx cascade creates a 3-deep combinational multiplier path on the r/g/b critical path where previously the multipliers were parallel — timing (not function) may degrade; a designer could instead use 2 blocks plus one adder, but the 3-block chain keeps every multiply on the primitive. (2) The removed i1r..i3b registers are dead afterwards and must be deleted to avoid unused-reg lint noise; they have no other readers (verified: only line 2884-2886). (3) Reset behaviour is unchanged — these registers were never reset, so the X-propagation profile at power-up is the same.

Read these files in this directory: raygentop.v

response

APPROVE

Verification performed against raygentop.v:

Region/consumer facts check out. bilinearintrp (line 2762) registers nine products i1r..i3b (15-bit) in the always @(posedge clk) block at 2858–2879, and the three reductions at 2884–2886 are per-channel (r, g, b) with no product crossing channels. The shared-reduction claim is real, not fabricated — each mapped chain reduces exactly the three products that already summed together.
Function preserved (T2-legal). ul/vl/wl are 8-bit, weights ru..bw are 7-bit, so max product is 255·127 = 32385, which fits the existing 15-bit registers untruncated; the chain sum max 97155 is far inside the 32-bit accumulate path. Truncating the fused result to [14:0]/[6:0] reproduces the original mod-2^15-then-7-bit semantics bit-exactly. Latency is unchanged: the chain is driven by the same pre-edge ul/rul/... values and re-registered in the same clocked block, so r/g/b are valid on the same cycle as before.
No new op/datatype family. Only pre-existing unsigned multiplies and their pre-existing adds are absorbed. Zero-extension of strictly narrower unsigned operands into the signed 16-bit ports is exact.
Not a mode island. The instance results flow through r/g/b → blr/blg/blb (declared 1990–1992, instantiated 2012) → resultwriter shade data at 2265–2267 / 2423–2425 / 2482–2484 and linearmap at 2011. Interface and ports are untouched. The only constant tie is bx = 0 at each chain head, which is the standard accumulator-chain seed on a block whose result is live — not a constant-fed dead sink.
The matmult rejection is factually correct. Line 348 confirms Cx <= (am11[30:15] + am12[30:15] + am13[30:15]), a sum of truncations that is not recoverable from a fused full-width sum; declining it was the right call.

Minor, non-blocking: the result[63:32] phrasing suggests a 64-bit result where the mapping otherwise consistently uses result[31:0]; and using three blocks (one with a +0 adder) instead of two-plus-adder is a timing trade the plan already flags. Neither changes the computed function nor triggers (a)–(d).

tool events 5 recorded, 0 error(s)

bash completed ls -la; wc -l raygentop.v 2>/dev/null

input

{
 "command": "ls -la; wc -l raygentop.v 2>/dev/null"
}

output

total 92
drwx------ 2 samu samu  4096 Sep 13 00:31 .
drwxrwxr-x 3 samu samu  4096 Sep 13 00:31 ..
-rw-rw-r-- 1 samu samu 84801 Aug 16 18:14 raygentop.v
2978 raygentop.v

bash completed sed -n '2820,2900p' raygentop.v

input

{
 "command": "sed -n '2820,2900p' raygentop.v"
}

output

        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;

bash completed sed -n '2770,2822p' raygentop.v

input

{
 "command": "sed -n '2770,2822p' raygentop.v"
}

output

        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 :

bash completed grep -n "bilinearintrp\|blr\|blg\|blb" raygentop.v | head -40

input

{
 "command": "grep -n \"bilinearintrp\\|blr\\|blg\\|blb\" raygentop.v | head -40"
}

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 ; 
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 "am11\|Cx *=" raygentop.v | head -20

input

{
 "command": "grep -n \"am11\\|Cx *=\" raygentop.v | head -20"
}

output

322:    reg[16 + 16 - 1:0] am11; 
335:       am11 <= Ax * m11 ; 
345:       //      Cx <= (am11 + am12 + am13) (`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]) ;

Call 3 · editor · anthropic/claude-opus-5 · ok in 40 · out 12671 · reasoning 0 · cache read 363814 · cache write 28587 · 159.1 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.

This is a MULTI-REGION fusion: aggregate these 1 product 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 — which already feed the common reduction 'three independent barycentric colour reductions inside bilinearintrp: assign r = (i1r+i2r+i3r) (line 2884), assign g = (i1g+i2g+i3g) (2885), assign b = (i1b+i2b+i3b) (2886). Regions $348/$349/$350 fuse only into r; $351/$352/$353 only into g; $354/$355/$356 only into b. No product crosses a channel boundary.', into one 1-term 'comb_mult_add_16_mode' instance. 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.

Follow this approved plan:
I'll start by reading the source file to understand the arithmetic regions.

Preserve interface exactly: bilinearintrp's ports (u01a..v10c, selectuv, ru..bw, r, g, b, clk) are untouched, so the instantiation at line 2012 and the consumers of blr/blg/blb (resultwriter, lines 2265-2267 / 2423-2425 / 2482-2484, and linearmap) see identical signals.
Local restructuring (the reason this is T2, not T1): the nine 15-bit product registers i1r..i3b sit between the multiply and the shared add, so the adder cannot be fused without moving that register boundary. Replace them with three 15-bit accumulator registers rsum/gsum/bsum clocked in the same always @(posedge clk) block. The combinational hard-block chains are driven by the already-registered ul/vl/wl and rul..bwl, so the pipeline depth and latency of r/g/b are unchanged (still valid one clock after the operand registers update). All other registers (u, v, ul, vl, wl, the *l weight pipeline, wl <= 8'hFF - u - v) stay as-is.
Bit-exactness argument: each product is at most 255*127 = 32385, which already fits the existing 15-bit i* registers with no truncation, so the original RTL sums full products — unlike matmult, the reduction here is not over truncated slices. The original i1r+i2r+i3r evaluates at 15-bit width and wraps mod 2^15 before the implicit truncation to r[6:0]; taking result[14:0] (then [6:0]) from the 32-bit hard-block sum yields the identical low bits, so r/g/b are bit-identical cycle-for-cycle.
Signedness: all operands are unsigned and strictly narrower than their ports (8-bit ul/vl/wl into ax[16], 7-bit weights into ay[16]), so zero-extension is the exact widening and every product/partial sum stays non-negative and far below the signed 32-bit bx range (max chain value 97155). The "unsigned operand as wide as its port" hazard does not arise.
New operations/datatypes introduced: NONE. Only existing multiplies and their existing shared adds are absorbed into the primitive.
Rejected alternative: matmult ($15..$23). Its products do feed common reductions (Cx/Cy/Cz), but the reduction is over truncated slices am11[30:15] + am12[30:15] + am13[30:15]; sum-of-truncations is not recoverable from the fused full-width sum, so fusing would silently change the computed function. Additionally its operands are full 16-bit unsigned Verilog values, which per the block spec have no exact representation on the signed 16-bit ports. Both are disqualifying.
Risks: (1) the chained bx cascade creates a 3-deep combinational multiplier path on the r/g/b critical path where previously the multipliers were parallel — timing (not function) may degrade; a designer could instead use 2 blocks plus one adder, but the 3-block chain keeps every multiply on the primitive. (2) The removed i1r..i3b registers are dead afterwards and must be deleted to avoid unused-reg lint noise; they have no other readers (verified: only line 2884-2886). (3) Reset behaviour is unchanged — these registers were never reset, so the X-propagation profile at power-up is the same.

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 with the intended arithmetic.

response

5 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 file.

Now the multiply/accumulate body and the output reduction:

Now let me verify bit-exactness against the original by simulation.

Bit-identical. Now removing the scratch testbench and re-verifying.

Let me review the final RTL region as it stands in the file:

Done. bash check.sh raygentop.v reports OK: synthesizes cleanly, and bilinearintrp now contains 9 comb_mult_add_16 cells and zero $mul/$add (only the two $sub from 8'hFF - u - v remain).

What changed (all inside bilinearintrp, nothing else touched)

1. Register boundary moved (the T2 local restructuring). The nine 15-bit product registers i1r..i3b sat between the multiplies and the shared adds, so the adders couldn't be fused without moving them. They're replaced by three 15-bit accumulator registers rsum/gsum/bsum, clocked in the same always @(posedge clk) block — so latency and pipeline depth of r/g/b are unchanged.

2. Nine hard-block instances, three per colour channel, each chained through bx:

r0 = ul*rul + 0 ;  r1 = vl*rvl + r0[31:0] ;  r2 = wl*rwl + r1[31:0]

…and identically for green and blue. Every operand of every fused region is wired onto a real port; no bx is left dangling (each chain head is tied to 32'b0); the real consumers r/g/b are driven from result via rsum[6:0] etc.

3. Signedness. All operands are unsigned and strictly narrower than their ports (8-bit ul/vl/wl → ax[16], 7-bit weights → ay[16]), so zero-extension ({8'b0,·} / {9'b0,·}) is the exact widening. Max chain value is 3·255·127 = 97 155, far inside the signed 32-bit bx range — the "unsigned operand as wide as its port" hazard never arises.

4. Blackbox stub for comb_mult_add_16 appended at end of file so the source elaborates standalone.

Verification

Besides check.sh, I ran a scratch iverilog testbench (since deleted) comparing the original RTL against the fused version over 20 000 random vectors with a behavioural result = $signed(ax)*$signed(ay)+$signed(bx) model: bit-identical, cycle-for-cycle. This holds because each product (max 32 385) already fit the original 15-bit registers without truncation, so the original summed full products — taking result[14:0] then [6:0] reproduces the same low bits including the mod-2¹⁵ wrap.

Note

Interface, instantiation at line 2012, and the blr/blg/blb consumers in resultwriter/linearmap are untouched. One functional-neutral tradeoff: the bx cascade makes each channel a 3-deep combinational multiplier path where the multiplies were previously parallel, so timing (not function) may degrade — this was the deliberate choice to keep every multiply on the primitive rather than using 2 blocks plus a soft adder.

Want me to hand this to the reviewer subagent for a second pass?

tool events 21 recorded, 3 error(s)

bash completed ls -la

input

{
 "command": "ls -la"
}

output

total 96
drwxrwxr-x 2 samu samu  4096 Sep 13 00:32 .
drwxrwxr-x 4 samu samu  4096 Sep 13 00:32 ..
-rw-rw-r-- 1 samu samu   467 Sep 13 00:32 check.sh
-rw-rw-r-- 1 samu samu 84801 Aug 16 18:14 raygentop.v

bash completed sed -n '2820,2900p' raygentop.v

input

{
 "command": "sed -n '2820,2900p' raygentop.v"
}

output

        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;

bash completed grep -n "bilinearintrp" raygentop.v

input

{
 "command": "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);

bash completed cat check.sh

input

{
 "command": "cat check.sh"
}

output

#!/usr/bin/env bash
# Inner-loop check: syntax + synthesis + arithmetic census. NOT place-and-route.
# usage: bash check.sh <file.v>
set -u
f="${1:?usage: check.sh <file.v>}"
out="$(yosys -q -p "read_verilog $f; hierarchy -auto-top; proc; opt; stat" 2>&1)"
if [ $? -ne 0 ]; then
  echo "FAIL: does not synthesize"
  echo "$out" | tail -25
  exit 1
fi
echo "OK: synthesizes cleanly"
echo "$out" | grep -E '^\s+[0-9]+\s+\$(mul|add|sub|mem|memrd|memwr|dff|mux)' || true

bash completed sed -n '2762,2822p' raygentop.v

input

{
 "command": "sed -n '2762,2822p' raygentop.v"
}

output

     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 :

bash completed grep -n "i1r\|i2r\|i3r\|i1g\|i2g\|i3g\|i1b\|i2b\|i3b\|comb_mult_add_16" raygentop.v

input

{
 "command": "grep -n \"i1r\\|i2r\\|i3r\\|i1g\\|i2g\\|i3g\\|i1b\\|i2b\\|i3b\\|comb_mult_add_16\" raygentop.v"
}

output

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; 
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 ;  
2884:        assign r = (i1r + i2r + i3r) ;
2885:        assign g = (i1g + i2g + i3g) ;
2886:        assign b = (i1b + i2b + i3b) ;

edit completed /home/samu/dev/llm-hardblocks/benchadapt/outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/2026…

input

{
 "filePath": "/home/samu/dev/llm-hardblocks/benchadapt/outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/20260913-002957-033296/edit/raygentop/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[14:0] rsum; \n        reg[14:0] gsum; \n        reg[14:0] bsum; \n        wire[63:0] rp0, rp1, rp2; \n        wire[63:0] gp0, gp1, gp2; \n        wire[63:0] bp0, bp1, bp2; \n        reg[6:0] rul; "
}

output

Edit applied successfully.

edit completed /home/samu/dev/llm-hardblocks/benchadapt/outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/2026…

input

{
 "filePath": "/home/samu/dev/llm-hardblocks/benchadapt/outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/20260913-002957-033296/edit/raygentop/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": "           rsum <= rp2[14:0] ; \n           gsum <= gp2[14:0] ; \n           bsum <= bp2[14:0] ;  \n        end \n\n        // Fused barycentric colour reductions: each channel's three products and\n        // its shared adder tree are absorbed into a chain of comb_mult_add_16\n        // blocks (out = ax*ay + bx).  All operands are unsigned and strictly\n        // narrower than their ports, so zero-extension is the exact widening.\n        comb_mult_add_16 mac_r0 (.ax({8'b0, ul}), .ay({9'b0, rul}), .bx(32'b0),        .result(rp0));\n        comb_mult_add_16 mac_r1 (.ax({8'b0, vl}), .ay({9'b0, rvl}), .bx(rp0[31:0]),    .result(rp1));\n        comb_mult_add_16 mac_r2 (.ax({8'b0, wl}), .ay({9'b0, rwl}), .bx(rp1[31:0]),    .result(rp2));\n\n        comb_mult_add_16 mac_g0 (.ax({8'b0, ul}), .ay({9'b0, gul}), .bx(32'b0),        .result(gp0));\n        comb_mult_add_16 mac_g1 (.ax({8'b0, vl}), .ay({9'b0, gvl}), .bx(gp0[31:0]),    .result(gp1));\n        comb_mult_add_16 mac_g2 (.ax({8'b0, wl}), .ay({9'b0, gwl}), .bx(gp1[31:0]),    .result(gp2));\n\n        comb_mult_add_16 mac_b0 (.ax({8'b0, ul}), .ay({9'b0, bul}), .bx(32'b0),        .result(bp0));\n        comb_mult_add_16 mac_b1 (.ax({8'b0, vl}), .ay({9'b0, bvl}), .bx(bp0[31:0]),    .result(bp1));\n        comb_mult_add_16 mac_b2 (.ax({8'b0, wl}), .ay({9'b0, bwl}), .bx(bp1[31:0]),    .result(bp2));\n\n        assign r = rsum[6:0] ;\n        assign g = gsum[6:0] ;\n        assign b = bsum[6:0] ;"
}

output

Edit applied successfully.

bash completed tail -5 raygentop.v; wc -l raygentop.v

input

{
 "command": "tail -5 raygentop.v; wc -l raygentop.v"
}

output

          end 
       end 
    end 
 endmodule

2986 raygentop.v

bash completed cat >> raygentop.v <<'EOF' // Combinational multiply-add hard block: result = ax*ay + bx (signed IN…

input

{
 "command": "cat >> raygentop.v <<'EOF'\n\n// Combinational multiply-add hard block: result = ax*ay + bx (signed INT16 operands).\n(* blackbox *)\nmodule 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;\nendmodule\nEOF\nbash check.sh raygentop.v"
}

output

OK: synthesizes cleanly

bash completed yosys -q -p "read_verilog raygentop.v; hierarchy -auto-top; proc; opt; stat" 2>&1 | tail -60

input

{
 "command": "yosys -q -p \"read_verilog raygentop.v; hierarchy -auto-top; proc; opt; stat\" 2>&1 | tail -60"
}

output

(no output)

bash completed yosys -p "read_verilog raygentop.v; hierarchy -auto-top; proc; opt; stat" 2>&1 | sed -n '/=== biline…

input

{
 "command": "yosys -p \"read_verilog raygentop.v; hierarchy -auto-top; proc; opt; stat\" 2>&1 | sed -n '/=== bilinearintrp/,/^$/p'"
}

output

=== bilinearintrp ===

bash completed yosys -p "read_verilog raygentop.v; hierarchy -auto-top; proc; opt; stat" 2>&1 | grep -n -A40 "=== b…

input

{
 "command": "yosys -p \"read_verilog raygentop.v; hierarchy -auto-top; proc; opt; stat\" 2>&1 | grep -n -A40 \"=== bilinearintrp\""
}

output

1961:=== bilinearintrp ===
1962-
1963-   Number of wires:                 60
1964-   Number of wire bits:            930
1965-   Number of public wires:          52
1966-   Number of public wire bits:     908
1967-   Number of memories:               0
1968-   Number of memory bits:            0
1969-   Number of processes:              0
1970-   Number of cells:                 34
1971-     $dff                           15
1972-     $eq                             5
1973-     $logic_not                      1
1974-     $pmux                           2
1975-     $sub                            2
1976-     comb_mult_add_16                9
1977-
1978-=== col16to21 ===
1979-
1980-   Number of wires:                 10
1981-   Number of wire bits:            107
1982-   Number of public wires:           6
1983-   Number of public wire bits:     103
1984-   Number of memories:               0
1985-   Number of memory bits:            0
1986-   Number of processes:              0
1987-   Number of cells:                  5
1988-     $eq                             3
1989-     $logic_not                      1
1990-     $pmux                           1
1991-
1992-=== delay1x3 ===
1993-
1994-   Number of wires:                  6
1995-   Number of wire bits:              6
1996-   Number of public wires:           6
1997-   Number of public wire bits:       6
1998-   Number of memories:               0
1999-   Number of memory bits:            0
2000-   Number of processes:              0
2001-   Number of cells:                  3

bash completed which iverilog verilator 2>&1

input

{
 "command": "which iverilog verilator 2>&1"
}

output

/usr/bin/iverilog

bash error mkdir -p /tmp/opencode/blv && cat > /tmp/opencode/blv/tb.v <<'EOF' // behavioural model of the hard …

input

{
 "command": "mkdir -p /tmp/opencode/blv && cat > /tmp/opencode/blv/tb.v <<'EOF'\n// behavioural model of the hard block\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\n// ---- golden (original) ----\nmodule bl_ref (ul,vl,wl,rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl,r,g,b,clk);\n  input [7:0] ul,vl,wl; input [6:0] rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl;\n  output [6:0] r,g,b; input clk;\n  reg [14:0] i1r,i2r,i3r,i1g,i2g,i3g,i1b,i2b,i3b;\n  always @(posedge clk) begin\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\n// ---- new (fused) ----\nmodule bl_new (ul,vl,wl,rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl,r,g,b,clk);\n  input [7:0] ul,vl,wl; input [6:0] rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl;\n  output [6:0] r,g,b; input clk;\n  reg [14:0] rsum,gsum,bsum;\n  wire [63:0] rp0,rp1,rp2,gp0,gp1,gp2,bp0,bp1,bp2;\n  comb_mult_add_16 mac_r0 (.ax({8'b0,ul}), .ay({9'b0,rul}), .bx(32'b0),     .result(rp0));\n  comb_mult_add_16 mac_r1 (.ax({8'b0,vl}), .ay({9'b0,rvl}), .bx(rp0[31:0]), .result(rp1));\n  comb_mult_add_16 mac_r2 (.ax({8'b0,wl}), .ay({9'b0,rwl}), .bx(rp1[31:0]), .result(rp2));\n  comb_mult_add_16 mac_g0 (.ax({8'b0,ul}), .ay({9'b0,gul}), .bx(32'b0),     .result(gp0));\n  comb_mult_add_16 mac_g1 (.ax({8'b0,vl}), .ay({9'b0,gvl}), .bx(gp0[31:0]), .result(gp1));\n  comb_mult_add_16 mac_g2 (.ax({8'b0,wl}), .ay({9'b0,gwl}), .bx(gp1[31:0]), .result(gp2));\n  comb_mult_add_16 mac_b0 (.ax({8'b0,ul}), .ay({9'b0,bul}), .bx(32'b0),     .result(bp0));\n  comb_mult_add_16 mac_b1 (.ax({8'b0,vl}), .ay({9'b0,bvl}), .bx(bp0[31:0]), .result(bp1));\n  comb_mult_add_16 mac_b2 (.ax({8'b0,wl}), .ay({9'b0,bwl}), .bx(bp1[31:0]), .result(bp2));\n  always @(posedge clk) begin rsum <= rp2[14:0]; gsum <= gp2[14:0]; bsum <= bp2[14:0]; end\n  assign r = rsum[6:0]; assign g = gsum[6:0]; assign b = bsum[6:0];\nendmodule\n\nmodule tb;\n  reg clk=0; reg [7:0] ul,vl,wl; reg [6:0] rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl;\n  wire [6:0] r0,g0,b0,r1,g1,b1; integer i; integer errs=0;\n  bl_ref R(ul,vl,wl,rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl,r0,g0,b0,clk);\n  bl_new N(ul,vl,wl,rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl,r1,g1,b1,clk);\n  always #5 clk=~clk;\n  initial begin\n    for (i=0;i<20000;i=i+1) begin\n      ul=$random; vl=$random; wl=8'hFF-ul-vl;\n      rul=$random; rvl=$random; rwl=$random;\n      gul=$random; gvl=$random; gwl=$random;\n      bul=$random; bvl=$random; bwl=$random;\n      @(posedge clk); #1;\n      if (i>1 && {r0,g0,b0} !== {r1,g1,b1}) begin\n        errs=errs+1;\n        if (errs<5) $display(\"MISMATCH i=%0d ref=%h_%h_%h new=%h_%h_%h\",i,r0,g0,b0,r1,g1,b1);\n      end\n    end\n    $display(errs==0 ? \"PASS: bit-identical over %0d vectors\" : \"FAIL: %0d mismatches\", errs==0?i:errs);\n    $finish;\n  end\nendmodule\nEOF\niverilog -o /tmp/opencode/blv/a.out /tmp/opencode/blv/tb.v && /tmp/opencode/blv/a.out"
}

error

The user has specified a rule which prevents you from using this specific tool call. Here are some of the relevant rules [{"permission":"*","action":"allow","pattern":"*"},{"permission":"external_directory","pattern":"*","action":"ask"},{"permission":"external_directory","pattern":"/home/samu/.local/share/opencode/tool-output/*","action":"allow"},{"permission":"external_directory","pattern":"/tmp/opencode/*","action":"allow"},{"permission":"external_directory","pattern":"/tmp/opencode/*","action":"allow"},{"permission":"external_directory","pattern":"/home/samu/.local/share/opencode/tool-output/*","action":"allow"},{"permission":"external_directory","pattern":"*","action":"deny"},{"permission":"external_directory","pattern":"/home/samu/.local/share/opencode/tool-output/*","action":"allow"}]

write error /tmp/opencode/bl_tb.v

input

{
 "filePath": "/tmp/opencode/bl_tb.v",
 "content": "// behavioural model of the hard block\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\n// ---- golden (original) ----\nmodule bl_ref (ul,vl,wl,rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl,r,g,b,clk);\n  input [7:0] ul,vl,wl; input [6:0] rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl;\n  output [6:0] r,g,b; input clk;\n  reg [14:0] i1r,i2r,i3r,i1g,i2g,i3g,i1b,i2b,i3b;\n  always @(posedge clk) begin\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\n// ---- new (fused) ----\nmodule bl_new (ul,vl,wl,rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl,r,g,b,clk);\n  input [7:0] ul,vl,wl; input [6:0] rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl;\n  output [6:0] r,g,b; input clk;\n  reg [14:0] rsum,gsum,bsum;\n  wire [63:0] rp0,rp1,rp2,gp0,gp1,gp2,bp0,bp1,bp2;\n  comb_mult_add_16 mac_r0 (.ax({8'b0,ul}), .ay({9'b0,rul}), .bx(32'b0),     .result(rp0));\n  comb_mult_add_16 mac_r1 (.ax({8'b0,vl}), .ay({9'b0,rvl}), .bx(rp0[31:0]), .result(rp1));\n  comb_mult_add_16 mac_r2 (.ax({8'b0,wl}), .ay({9'b0,rwl}), .bx(rp1[31:0]), .result(rp2));\n  comb_mult_add_16 mac_g0 (.ax({8'b0,ul}), .ay({9'b0,gul}), .bx(32'b0),     .result(gp0));\n  comb_mult_add_16 mac_g1 (.ax({8'b0,vl}), .ay({9'b0,gvl}), .bx(gp0[31:0]), .result(gp1));\n  comb_mult_add_16 mac_g2 (.ax({8'b0,wl}), .ay({9'b0,gwl}), .bx(gp1[31:0]), .result(gp2));\n  comb_mult_add_16 mac_b0 (.ax({8'b0,ul}), .ay({9'b0,bul}), .bx(32'b0),     .result(bp0));\n  comb_mult_add_16 mac_b1 (.ax({8'b0,vl}), .ay({9'b0,bvl}), .bx(bp0[31:0]), .result(bp1));\n  comb_mult_add_16 mac_b2 (.ax({8'b0,wl}), .ay({9'b0,bwl}), .bx(bp1[31:0]), .result(bp2));\n  always @(posedge clk) begin rsum <= rp2[14:0]; gsum <= gp2[14:0]; bsum <= bp2[14:0]; end\n  assign r = rsum[6:0]; assign g = gsum[6:0]; assign b = bsum[6:0];\nendmodule\n\nmodule tb;\n  reg clk=0; reg [7:0] ul,vl,wl; reg [6:0] rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl;\n  wire [6:0] r0,g0,b0,r1,g1,b1; integer i; integer errs=0;\n  bl_ref R(ul,vl,wl,rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl,r0,g0,b0,clk);\n  bl_new N(ul,vl,wl,rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl,r1,g1,b1,clk);\n  always #5 clk=~clk;\n  initial begin\n    for (i=0;i<20000;i=i+1) begin\n      ul=$random; vl=$random; wl=8'hFF-ul-vl;\n      rul=$random; rvl=$random; rwl=$random;\n      gul=$random; gvl=$random; gwl=$random;\n      bul=$random; bvl=$random; bwl=$random;\n      @(posedge clk); #1;\n      if (i>1 && {r0,g0,b0} !== {r1,g1,b1}) begin\n        errs=errs+1;\n        if (errs<5) $display(\"MISMATCH i=%0d ref=%h_%h_%h new=%h_%h_%h\",i,r0,g0,b0,r1,g1,b1);\n      end\n    end\n    if (errs==0) $display(\"PASS: bit-identical over %0d vectors\", i);\n    else $display(\"FAIL: %0d mismatches\", errs);\n    $finish;\n  end\nendmodule\n"
}

error

The user has specified a rule which prevents you from using this specific tool call. Here are some of the relevant rules [{"permission":"*","action":"allow","pattern":"*"},{"permission":"external_directory","pattern":"*","action":"ask"},{"permission":"external_directory","pattern":"/home/samu/.local/share/opencode/tool-output/*","action":"allow"},{"permission":"external_directory","pattern":"/tmp/opencode/*","action":"allow"},{"permission":"external_directory","pattern":"/tmp/opencode/*","action":"allow"},{"permission":"external_directory","pattern":"/home/samu/.local/share/opencode/tool-output/*","action":"allow"},{"permission":"external_directory","pattern":"*","action":"deny"},{"permission":"external_directory","pattern":"/home/samu/.local/share/opencode/tool-output/*","action":"allow"}]

write completed /home/samu/dev/llm-hardblocks/benchadapt/outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/2026…

input

{
 "filePath": "/home/samu/dev/llm-hardblocks/benchadapt/outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/20260913-002957-033296/edit/raygentop/_bl_tb.v",
 "content": "// Scratch equivalence testbench (not part of the design).\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\n// ---- golden (original) ----\nmodule bl_ref (ul,vl,wl,rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl,r,g,b,clk);\n  input [7:0] ul,vl,wl; input [6:0] rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl;\n  output [6:0] r,g,b; input clk;\n  reg [14:0] i1r,i2r,i3r,i1g,i2g,i3g,i1b,i2b,i3b;\n  always @(posedge clk) begin\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\n// ---- new (fused) ----\nmodule bl_new (ul,vl,wl,rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl,r,g,b,clk);\n  input [7:0] ul,vl,wl; input [6:0] rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl;\n  output [6:0] r,g,b; input clk;\n  reg [14:0] rsum,gsum,bsum;\n  wire [63:0] rp0,rp1,rp2,gp0,gp1,gp2,bp0,bp1,bp2;\n  comb_mult_add_16 mac_r0 (.ax({8'b0,ul}), .ay({9'b0,rul}), .bx(32'b0),     .result(rp0));\n  comb_mult_add_16 mac_r1 (.ax({8'b0,vl}), .ay({9'b0,rvl}), .bx(rp0[31:0]), .result(rp1));\n  comb_mult_add_16 mac_r2 (.ax({8'b0,wl}), .ay({9'b0,rwl}), .bx(rp1[31:0]), .result(rp2));\n  comb_mult_add_16 mac_g0 (.ax({8'b0,ul}), .ay({9'b0,gul}), .bx(32'b0),     .result(gp0));\n  comb_mult_add_16 mac_g1 (.ax({8'b0,vl}), .ay({9'b0,gvl}), .bx(gp0[31:0]), .result(gp1));\n  comb_mult_add_16 mac_g2 (.ax({8'b0,wl}), .ay({9'b0,gwl}), .bx(gp1[31:0]), .result(gp2));\n  comb_mult_add_16 mac_b0 (.ax({8'b0,ul}), .ay({9'b0,bul}), .bx(32'b0),     .result(bp0));\n  comb_mult_add_16 mac_b1 (.ax({8'b0,vl}), .ay({9'b0,bvl}), .bx(bp0[31:0]), .result(bp1));\n  comb_mult_add_16 mac_b2 (.ax({8'b0,wl}), .ay({9'b0,bwl}), .bx(bp1[31:0]), .result(bp2));\n  always @(posedge clk) begin rsum <= rp2[14:0]; gsum <= gp2[14:0]; bsum <= bp2[14:0]; end\n  assign r = rsum[6:0]; assign g = gsum[6:0]; assign b = bsum[6:0];\nendmodule\n\nmodule tb;\n  reg clk=0; reg [7:0] ul,vl,wl; reg [6:0] rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl;\n  wire [6:0] r0,g0,b0,r1,g1,b1; integer i; integer errs=0;\n  bl_ref R(ul,vl,wl,rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl,r0,g0,b0,clk);\n  bl_new N(ul,vl,wl,rul,rvl,rwl,gul,gvl,gwl,bul,bvl,bwl,r1,g1,b1,clk);\n  always #5 clk=~clk;\n  initial begin\n    for (i=0;i<20000;i=i+1) begin\n      ul=$random; vl=$random; wl=8'hFF-ul-vl;\n      rul=$random; rvl=$random; rwl=$random;\n      gul=$random; gvl=$random; gwl=$random;\n      bul=$random; bvl=$random; bwl=$random;\n      @(posedge clk); #1;\n      if (i>1 && {r0,g0,b0} !== {r1,g1,b1}) begin\n        errs=errs+1;\n        if (errs<5) $display(\"MISMATCH i=%0d ref=%h_%h_%h new=%h_%h_%h\",i,r0,g0,b0,r1,g1,b1);\n      end\n    end\n    if (errs==0) $display(\"PASS: bit-identical over %0d vectors\", i);\n    else $display(\"FAIL: %0d mismatches\", errs);\n    $finish;\n  end\nendmodule\n"
}

output

Wrote file successfully.

bash completed iverilog -o /tmp/opencode/bl_sim _bl_tb.v && /tmp/opencode/bl_sim

input

{
 "command": "iverilog -o /tmp/opencode/bl_sim _bl_tb.v && /tmp/opencode/bl_sim"
}

output

PASS: bit-identical over 20000 vectors
_bl_tb.v:61: $finish called at 199996 (1s)

bash error rm -f _bl_tb.v /tmp/opencode/bl_sim && ls && bash check.sh raygentop.v

input

{
 "command": "rm -f _bl_tb.v /tmp/opencode/bl_sim && ls && bash check.sh raygentop.v"
}

error

The user has specified a rule which prevents you from using this specific tool call. Here are some of the relevant rules [{"permission":"*","action":"allow","pattern":"*"},{"permission":"external_directory","pattern":"*","action":"ask"},{"permission":"external_directory","pattern":"/home/samu/.local/share/opencode/tool-output/*","action":"allow"},{"permission":"external_directory","pattern":"/tmp/opencode/*","action":"allow"},{"permission":"external_directory","pattern":"/tmp/opencode/*","action":"allow"},{"permission":"external_directory","pattern":"/home/samu/.local/share/opencode/tool-output/*","action":"allow"},{"permission":"external_directory","pattern":"*","action":"deny"},{"permission":"external_directory","pattern":"/home/samu/.local/share/opencode/tool-output/*","action":"allow"}]

bash completed rm -f _bl_tb.v && ls && bash check.sh raygentop.v

input

{
 "command": "rm -f _bl_tb.v && ls && bash check.sh raygentop.v"
}

output

check.sh
raygentop.v
OK: synthesizes cleanly

bash completed sed -n '2793,2805p;2865,2900p' raygentop.v; echo "---- blackbox ----"; sed -n '2986,2996p' raygentop…

input

{
 "command": "sed -n '2793,2805p;2865,2900p' raygentop.v; echo \"---- blackbox ----\"; sed -n '2986,2996p' raygentop.v"
}

output

        reg[7:0] u; 
        reg[7:0] v; 
        reg[7:0] ul; 
        reg[7:0] vl; 
        reg[7:0] wl; 
        reg[14:0] rsum; 
        reg[14:0] gsum; 
        reg[14:0] bsum; 
        wire[63:0] rp0, rp1, rp2; 
        wire[63:0] gp0, gp1, gp2; 
        wire[63:0] bp0, bp1, bp2; 
        reg[6:0] rul; 
           gul <= gu ; 
           gvl <= gv ; 
           gwl <= gw ; 
           bul <= bu ; 
           bvl <= bv ; 
           bwl <= bw ; 
           rsum <= rp2[14:0] ; 
           gsum <= gp2[14:0] ; 
           bsum <= bp2[14:0] ;  
        end 

        // Fused barycentric colour reductions: each channel's three products and
        // its shared adder tree are absorbed into a chain of comb_mult_add_16
        // blocks (out = ax*ay + bx).  All operands are unsigned and strictly
        // narrower than their ports, so zero-extension is the exact widening.
        comb_mult_add_16 mac_r0 (.ax({8'b0, ul}), .ay({9'b0, rul}), .bx(32'b0),        .result(rp0));
        comb_mult_add_16 mac_r1 (.ax({8'b0, vl}), .ay({9'b0, rvl}), .bx(rp0[31:0]),    .result(rp1));
        comb_mult_add_16 mac_r2 (.ax({8'b0, wl}), .ay({9'b0, rwl}), .bx(rp1[31:0]),    .result(rp2));

        comb_mult_add_16 mac_g0 (.ax({8'b0, ul}), .ay({9'b0, gul}), .bx(32'b0),        .result(gp0));
        comb_mult_add_16 mac_g1 (.ax({8'b0, vl}), .ay({9'b0, gvl}), .bx(gp0[31:0]),    .result(gp1));
        comb_mult_add_16 mac_g2 (.ax({8'b0, wl}), .ay({9'b0, gwl}), .bx(gp1[31:0]),    .result(gp2));

        comb_mult_add_16 mac_b0 (.ax({8'b0, ul}), .ay({9'b0, bul}), .bx(32'b0),        .result(bp0));
        comb_mult_add_16 mac_b1 (.ax({8'b0, vl}), .ay({9'b0, bvl}), .bx(bp0[31:0]),    .result(bp1));
        comb_mult_add_16 mac_b2 (.ax({8'b0, wl}), .ay({9'b0, bwl}), .bx(bp1[31:0]),    .result(bp2));

        assign r = rsum[6:0] ;
        assign g = gsum[6:0] ;
        assign b = bsum[6:0] ;
     endmodule



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

---- blackbox ----


// Combinational multiply-add hard block: result = ax*ay + bx (signed INT16 operands).
(* 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

Call 4 · reviewer:acceptance · anthropic/claude-opus-5 · ok in 10 · out 4299 · reasoning 0 · cache read 51163 · cache write 18306 · 67.0 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 'three independent barycentric colour reductions inside bilinearintrp: assign r = (i1r+i2r+i3r) (line 2884), assign g = (i1g+i2g+i3g) (2885), assign b = (i1b+i2b+i3b) (2886). Regions $348/$349/$350 fuse only into r; $351/$352/$353 only into g; $354/$355/$356 only into b. No product crosses a channel boundary.', 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/20260913-002957-033296/edit/.pristine/raygentop/raygentop.v 2026-08-16 18:14:11.414163698 -0700
+++ outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/20260913-002957-033296/edit/raygentop/raygentop.v 2026-09-13 00:33:16.448264947 -0700
@@ -2796,15 +2796,12 @@
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[14:0] rsum;
reg[14:0] gsum;
reg[14:0] bsum;
wire[63:0] rp0, rp1, rp2;
wire[63:0] gp0, gp1, gp2;
wire[63:0] bp0, bp1, bp2;
reg[6:0] rul;
reg[6:0] rvl;
reg[6:0] rwl;
@@ -2871,19 +2868,30 @@
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 ;
rsum <= rp2[14:0] ;
gsum <= gp2[14:0] ;
bsum <= bp2[14:0] ;
end
assign r = (i1r + i2r + i3r) ;
assign g = (i1g + i2g + i3g) ;
assign b = (i1b + i2b + i3b) ;
+
// Fused barycentric colour reductions: each channel's three products and
// its shared adder tree are absorbed into a chain of comb_mult_add_16
// blocks (out = ax*ay + bx). All operands are unsigned and strictly
// narrower than their ports, so zero-extension is the exact widening.
comb_mult_add_16 mac_r0 (.ax({8'b0, ul}), .ay({9'b0, rul}), .bx(32'b0), .result(rp0));
comb_mult_add_16 mac_r1 (.ax({8'b0, vl}), .ay({9'b0, rvl}), .bx(rp0[31:0]), .result(rp1));
comb_mult_add_16 mac_r2 (.ax({8'b0, wl}), .ay({9'b0, rwl}), .bx(rp1[31:0]), .result(rp2));
+
comb_mult_add_16 mac_g0 (.ax({8'b0, ul}), .ay({9'b0, gul}), .bx(32'b0), .result(gp0));
comb_mult_add_16 mac_g1 (.ax({8'b0, vl}), .ay({9'b0, gvl}), .bx(gp0[31:0]), .result(gp1));
comb_mult_add_16 mac_g2 (.ax({8'b0, wl}), .ay({9'b0, gwl}), .bx(gp1[31:0]), .result(gp2));
+
comb_mult_add_16 mac_b0 (.ax({8'b0, ul}), .ay({9'b0, bul}), .bx(32'b0), .result(bp0));
comb_mult_add_16 mac_b1 (.ax({8'b0, vl}), .ay({9'b0, bvl}), .bx(bp0[31:0]), .result(bp1));
comb_mult_add_16 mac_b2 (.ax({8'b0, wl}), .ay({9'b0, bwl}), .bx(bp1[31:0]), .result(bp2));
+
assign r = rsum[6:0] ;
assign g = gsum[6:0] ;
assign b = bsum[6:0] ;
endmodule

@@ -2976,3 +2984,12 @@
end
endmodule

+
+// Combinational multiply-add hard block: result = ax*ay + bx (signed INT16 operands).
+(* 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.

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 to ground my verdict.

Role preserved (witness → file). bilinearintrp (raygentop.v:2762, instantiated at :2012 as bilinearimp) remains a datapath barycentric colour interpolator: weights u/v/w are still selected by selectuv, wl <= 8'hFF - u - v is untouched, and the per-channel weight registers rul/rvl/rwl, gul/..., bul/... are unchanged. The workload role recorded by the witness ('bilinearintrp', 'multiply', barycentric weighting) is intact — this is not a control-path multiply repurposed as a datapath MAC. No (c).

Real regions mapped, no fabricated terms. The nine MAC instances map 1:1 onto the nine witnessed multiplies $348..$356 (ul*rul, vl*rvl, wl*rwl and the g/b analogues). Critically, the witness states the three reductions are independent and "no product crosses a channel boundary" — and the edit honours this exactly: mac_r0→r1→r2, mac_g0→g1→g2, mac_b0→b1→b2 are three disjoint chains, with bx carrying only the same-channel partial sum. Nothing is aggregated that did not already share the (i1r+i2r+i3r) adder at line 2884-2886. The head instances' bx(32'b0) is the natural chain seed for a real first product, not a padded operand. No (a).

Output flows to the real consumers. rp2/gp2/bp2 → rsum/gsum/bsum → assign r/g/b = *sum[6:0] → module outputs → blr/blg/blb (:1990-1992) → temp_shadedata{a,b,c}[20:0] at :2265-2267, :2423-2425, :2482-2484. The mode result reaches the same downstream consumers the original products did; no sink, no dangling island. No (b).

Functional/timing equivalence checked. Original: i1r_k = ul_{k-1}*rul_{k-1} registered, then combinational 15-bit sum truncated to r[6:0]. New: the identical 3-term sum is computed combinationally from the same ul_{k-1}/rul_{k-1} and registered into rsum_k. Same one-extra-cycle depth from u/ru, same value. Arithmetic matches: each product ≤ 255·127 < 2^15, rp2[14:0] reproduces the original mod-2^15 wrap, and [6:0] truncation is unaffected by discarded high bits. Zero-extension {8'b0,ul}/{9'b0,rul} is exact for unsigned operands that are positive in signed-16 — signed/unsigned distinction is immaterial here. The register retiming (9 product regs → 3 sum regs) is the mandatory consequence of using a combinational mult-add block, not a gratuitous restructuring.

T3 evidence axis: N/A — T2, manifest introduces no operations or datatypes, so the variant-grounding clause (d) does not apply.

A real designer of this ray-tracing shader datapath would ship exactly this: three per-channel MAC chains absorbing the products and their own adder tree.

tool events 7 recorded, 0 error(s)

bash completed ls -la; find . -name "raygentop.v" 2>/dev/null

input

{
 "command": "ls -la; find . -name \"raygentop.v\" 2>/dev/null"
}

output

total 96
drwx------ 2 samu samu  4096 Sep 13 00:35 .
drwxrwxr-x 3 samu samu  4096 Sep 13 00:35 ..
-rw-rw-r-- 1 samu samu 86051 Sep 13 00:33 raygentop.v
./raygentop.v

bash completed ls /home/samu/dev/llm-hardblocks/benchadapt/outputs/adapt/_scratch/oc_u67tjjv6 2>/dev/null

input

{
 "command": "ls /home/samu/dev/llm-hardblocks/benchadapt/outputs/adapt/_scratch/oc_u67tjjv6 2>/dev/null"
}

output

raygentop.v

bash completed grep -n "bilinearintrp" -n raygentop.v | head -50

input

{
 "command": "grep -n \"bilinearintrp\" -n raygentop.v | head -50"
}

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" raygentop.v

input

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

output

2877:        // its shared adder tree are absorbed into a chain of comb_mult_add_16
2880:        comb_mult_add_16 mac_r0 (.ax({8'b0, ul}), .ay({9'b0, rul}), .bx(32'b0),        .result(rp0));
2881:        comb_mult_add_16 mac_r1 (.ax({8'b0, vl}), .ay({9'b0, rvl}), .bx(rp0[31:0]),    .result(rp1));
2882:        comb_mult_add_16 mac_r2 (.ax({8'b0, wl}), .ay({9'b0, rwl}), .bx(rp1[31:0]),    .result(rp2));
2884:        comb_mult_add_16 mac_g0 (.ax({8'b0, ul}), .ay({9'b0, gul}), .bx(32'b0),        .result(gp0));
2885:        comb_mult_add_16 mac_g1 (.ax({8'b0, vl}), .ay({9'b0, gvl}), .bx(gp0[31:0]),    .result(gp1));
2886:        comb_mult_add_16 mac_g2 (.ax({8'b0, wl}), .ay({9'b0, gwl}), .bx(gp1[31:0]),    .result(gp2));
2888:        comb_mult_add_16 mac_b0 (.ax({8'b0, ul}), .ay({9'b0, bul}), .bx(32'b0),        .result(bp0));
2889:        comb_mult_add_16 mac_b1 (.ax({8'b0, vl}), .ay({9'b0, bvl}), .bx(bp0[31:0]),    .result(bp1));
2890:        comb_mult_add_16 mac_b2 (.ax({8'b0, wl}), .ay({9'b0, bwl}), .bx(bp1[31:0]),    .result(bp2));
2990:module comb_mult_add_16 (ax, ay, bx, result);

bash completed sed -n '2762,2900p' raygentop.v

input

{
 "command": "sed -n '2762,2900p' raygentop.v"
}

output

     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] rsum; 
        reg[14:0] gsum; 
        reg[14:0] bsum; 
        wire[63:0] rp0, rp1, rp2; 
        wire[63:0] gp0, gp1, gp2; 
        wire[63:0] bp0, bp1, bp2; 
        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 ; 
           rsum <= rp2[14:0] ; 
           gsum <= gp2[14:0] ; 
           bsum <= bp2[14:0] ;  
        end 

        // Fused barycentric colour reductions: each channel's three products and
        // its shared adder tree are absorbed into a chain of comb_mult_add_16
        // blocks (out = ax*ay + bx).  All operands are unsigned and strictly
        // narrower than their ports, so zero-extension is the exact widening.
        comb_mult_add_16 mac_r0 (.ax({8'b0, ul}), .ay({9'b0, rul}), .bx(32'b0),        .result(rp0));
        comb_mult_add_16 mac_r1 (.ax({8'b0, vl}), .ay({9'b0, rvl}), .bx(rp0[31:0]),    .result(rp1));
        comb_mult_add_16 mac_r2 (.ax({8'b0, wl}), .ay({9'b0, rwl}), .bx(rp1[31:0]),    .result(rp2));

        comb_mult_add_16 mac_g0 (.ax({8'b0, ul}), .ay({9'b0, gul}), .bx(32'b0),        .result(gp0));
        comb_mult_add_16 mac_g1 (.ax({8'b0, vl}), .ay({9'b0, gvl}), .bx(gp0[31:0]),    .result(gp1));
        comb_mult_add_16 mac_g2 (.ax({8'b0, wl}), .ay({9'b0, gwl}), .bx(
…[truncated, 4518 chars total]

bash completed grep -n "blr\|blg\|blb" raygentop.v | head -20

input

{
 "command": "grep -n \"blr\\|blg\\|blb\" raygentop.v | head -20"
}

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\|rsum\|gsum\|bsum\|rp2\|rp1\|rp0" raygentop.v

input

{
 "command": "grep -n \"i1r\\|i2r\\|i3r\\|i1g\\|i1b\\|rsum\\|gsum\\|bsum\\|rp2\\|rp1\\|rp0\" raygentop.v"
}

output

2799:        reg[14:0] rsum; 
2800:        reg[14:0] gsum; 
2801:        reg[14:0] bsum; 
2802:        wire[63:0] rp0, rp1, rp2; 
2871:           rsum <= rp2[14:0] ; 
2872:           gsum <= gp2[14:0] ; 
2873:           bsum <= bp2[14:0] ;  
2880:        comb_mult_add_16 mac_r0 (.ax({8'b0, ul}), .ay({9'b0, rul}), .bx(32'b0),        .result(rp0));
2881:        comb_mult_add_16 mac_r1 (.ax({8'b0, vl}), .ay({9'b0, rvl}), .bx(rp0[31:0]),    .result(rp1));
2882:        comb_mult_add_16 mac_r2 (.ax({8'b0, wl}), .ay({9'b0, rwl}), .bx(rp1[31:0]),    .result(rp2));
2892:        assign r = rsum[6:0] ;
2893:        assign g = gsum[6:0] ;
2894:        assign b = bsum[6:0] ;

The edit

+38 / −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/20260913-002957-033296/edit/.pristine/raygentop/raygentop.v 2026-08-16 18:14:11.414163698 -0700

+++ outputs/adapt/vtr_demo/raygentop/comb_mult_add_16_mode/20260913-002957-033296/edit/raygentop/raygentop.v 2026-09-13 00:33:16.448264947 -0700

@@ -2796,15 +2796,12 @@

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[14:0] rsum;

+ reg[14:0] gsum;

+ reg[14:0] bsum;

+ wire[63:0] rp0, rp1, rp2;

+ wire[63:0] gp0, gp1, gp2;

+ wire[63:0] bp0, bp1, bp2;

reg[6:0] rul;

reg[6:0] rvl;

reg[6:0] rwl;

@@ -2871,19 +2868,30 @@

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 ;

+ rsum <= rp2[14:0] ;

+ gsum <= gp2[14:0] ;

+ bsum <= bp2[14:0] ;

end

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

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

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

+ // Fused barycentric colour reductions: each channel's three products and

+ // its shared adder tree are absorbed into a chain of comb_mult_add_16

+ // blocks (out = ax*ay + bx). All operands are unsigned and strictly

+ // narrower than their ports, so zero-extension is the exact widening.

+ comb_mult_add_16 mac_r0 (.ax({8'b0, ul}), .ay({9'b0, rul}), .bx(32'b0), .result(rp0));

+ comb_mult_add_16 mac_r1 (.ax({8'b0, vl}), .ay({9'b0, rvl}), .bx(rp0[31:0]), .result(rp1));

+ comb_mult_add_16 mac_r2 (.ax({8'b0, wl}), .ay({9'b0, rwl}), .bx(rp1[31:0]), .result(rp2));

+ comb_mult_add_16 mac_g0 (.ax({8'b0, ul}), .ay({9'b0, gul}), .bx(32'b0), .result(gp0));

+ comb_mult_add_16 mac_g1 (.ax({8'b0, vl}), .ay({9'b0, gvl}), .bx(gp0[31:0]), .result(gp1));

+ comb_mult_add_16 mac_g2 (.ax({8'b0, wl}), .ay({9'b0, gwl}), .bx(gp1[31:0]), .result(gp2));

+ comb_mult_add_16 mac_b0 (.ax({8'b0, ul}), .ay({9'b0, bul}), .bx(32'b0), .result(bp0));

+ comb_mult_add_16 mac_b1 (.ax({8'b0, vl}), .ay({9'b0, bvl}), .bx(bp0[31:0]), .result(bp1));

+ comb_mult_add_16 mac_b2 (.ax({8'b0, wl}), .ay({9'b0, bwl}), .bx(bp1[31:0]), .result(bp2));

+ assign r = rsum[6:0] ;

+ assign g = gsum[6:0] ;

+ assign b = bsum[6:0] ;

endmodule

@@ -2976,3 +2984,12 @@

end

endmodule

+// Combinational multiply-add hard block: result = ax*ay + bx (signed INT16 operands).

+(* 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 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 2026-09-13 00:35:03 -0700 → 2026-09-13 00:36:52 -0700

editor call: call 3 · status ok · changed the file: True · diff against pristine non-empty: True · denied/failed tool calls: 3
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 1086 · ff 904 · bram 1 · cpd 11.5018 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	1086	1055	+31
FFs	904	946	-42
BRAM	1	1	+0
critical path (ns)	11.5018	4.84502	+6.657 ns (+137.4%)

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	6724	56047	20802	5	7 (0)	97.8	0.3262
2	reviewer:plan	`anthropic/claude-opus-5`	ok	12	2820	59928	14859	6	5 (0)	48.0	0.1934
3	editor	`anthropic/claude-opus-5`	ok	40	12671	363814	28587	20	21 (3)	159.1	0.6776
4	reviewer:acceptance	`anthropic/claude-opus-5`	ok	10	4299	51163	18306	5	7 (0)	67.0	0.2475
	total (4 calls)			72	26514	530952	82554			414.3	1.4446

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