T36 CORRECTION (the important half). Building the cookbook sweep tool surfaced a defect in
tools/verify_map_findings.py, which I had already used to validate BOTH map audits:
- GNU C sources use FORM FEED (\f) page separators — loop.c 47, cse.c 36, reload1.c 27,
local-alloc.c 21. Python's splitlines() splits on \f; grep/sed do not. Every line number computed
after the first \f was shifted (up to 47 in loop.c), which is LARGER than the checker's own +/-40
window — precisely how a real quote gets reported FABRICATED.
- Re-run after the fix: T34 regalloc 27 OK/153 NEAR/0 FAB -> 180 OK/0/0. T35 four-file
47 OK/240 NEAR/12 FAB -> 299 OK/0/0. THE AGENTS' LINE NUMBERS WERE EXACT ALL ALONG. I had even
written the false "off by +2..+19" claim into the T35 agent prompt.
- MY DIAGNOSIS OF THE 12 WAS ALSO WRONG. I said agents pasted map prose into source_quote and
"verified" it by grepping — but I grepped claim_excerpt (which IS map prose) instead of
source_quote. The real source_quote was ` record_jump_equiv (insn, 0);` at cse.c:7511, a
correctly-located C line. Two stacked errors: a broken tool, then a check of the wrong field that
appeared to confirm it.
- Fixed: both tools use split("\n"); verify_map_findings.py documents the trap so it cannot return;
loop.md's "12 unverified" note is WITHDRAWN in place. Nothing was deleted on this basis (all 12
were CONFIRMED-status, none underpinned a refutation), and the T34/T35 upheld/overturned splits are
unaffected — those came from adversarial agents, not the checker.
T37 THE COOKBOOK SWEEP (what was asked for). New tools/sweep_citations.py puts the mechanical half of
a citation audit into zero-token tooling (offline-tooling-first): symbol-form cites are compared to
the real 2.7.2 definition line; file-form cites are localised to their enclosing function.
- matching-cookbook.md: 57 resolvable citations, all localisable. MIXED provenance but mostly sound —
materially better than the map files. loop.c:5556, local-alloc.c:1765/1795/1825, global.c:906/917/
924/1000, local-alloc.c:1021/1064, global.c:588/594, sched.c:820, expmed.c:556, jump.c:2131 all
land where the prose says. GENUINE MISS: expr.c:5535 is MIN/MAX optab code; the /s grant sites are
4577 and 4904.
- STATED LIMITATION: "lands in the right function" is weak for giants (expand_expr 4026->~6300,
jump_optimize 139->~2200). This is a CITATION sweep, not a claim audit — proportionate because the
cookbook's idioms are byte-proven and its cites are explanation. No idiom re-litigated.
Docs+tools only: no src/ or config/ touched; R22 not re-run and not claimed.
Scope enumerated before acting: cse_expr.md, loop.md, sched.md (full pass — T33 landed only a
partial), t7g-giant-harvest.md. 35 agents (9 derive + 26 adversarial refute), 2.48M subagent tokens.
308 findings: 174 CONFIRMED / 99 LINE-DRIFT / 26 REFUTED raised -> 20 UPHELD, 6 OVERTURNED / 9
unverifiable. cse_expr.md had the highest error density (17 refuted of 74); loop.md the lowest (3 of
96) thanks to its pre-existing caveat table.
12 FABRICATED (vs 0 last audit) — DIAGNOSED, not waved through: the agents pasted MAP text into the
source_quote field instead of compiler source. All 12 are CONFIRMED-status and none underpins an
upheld refutation, so nothing was deleted on bad evidence — but they are UNVERIFIED, they sit in
loop.md's biv-elimination area, and loop.md now records that as an open gap rather than a pass (R32).
Headline corrections:
- cse_expr: THE 1000-INSN CSE FLUSH DOES NOT EXIST IN 2.7.2 (added in 2.8.1; grep num_insns -> no
hits). It drove THREE places — §1's killer table, §6's giant tell, §7's "shift +-insns across the
1000 boundary" lever. A lever aimed at a counter our compiler lacks, in exactly the giants this map
serves. All struck.
- cse_expr: §2's "kill THE class reg" is singular and wrong. The audit BYTE-REPRODUCED T31's wall on
the pinned cc1: expand_block_move (mips.c:2350-2351) copy_addr_to_reg's BOTH aggregate addresses.
Two byte-proven remedies recorded, with the caveat that field-by-field copy is closed when the
target's own bytes need the block move (func_80132F40's case).
- cse_expr: assign_temp absent in 2.7.2 and no /s reset on slot reuse (recycled slots INHERIT /s);
no BUILT_IN_MEMSET; §6's "recompute after a join is never a residual" false at -O2.
- sched: S7's EPILOGUE half false (no live define_expand "epilogue" on MIPS) — re-scoped not deleted;
insn_cost is DEP-KIND-BLIND so restoring /s anti edges is not free.
- loop: "no memory load is EVER hoisted from a loop containing a call" FALSE — invariant_p checks
RTX_UNCHANGING_P first; byte-proven that a const int* load hoists to the preheader. Call args are
emitted LEFT-to-right, not right-to-left.
Remaining: matching-cookbook.md (~52 citations, MIXED provenance) — but a DIFFERENT risk profile,
since its idioms are byte-proven and citations are explanation, so a targeted citation sweep is
proportionate rather than a full audit. Not done; flagged.
Docs-only: no src/ or config/ touched, R22 not re-run and not claimed.
Drew T