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v2.7.5 "Tally": every audit claim closed with a measurement or a reason - #553
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Core audit §4.2-§4.4 and §4.7, for v2.7.5. Removal of anything deprecated here is decided at v2.9.0 (ADR 0041); this release only marks it. §4.4, 18 rustynes_cpu::Bus methods. The audit named 22 methods "never called by Cpu". I did not grep for that: a name like `cpu_read` is also an inherent method on the core bus and on every mapper, so text search cannot tell a trait call from anything else. Instead every trait method was temporarily marked #[deprecated] and the compiler listed each real call site, for the workspace (all targets) and for every feature set CI builds (cpu-boot-trace, irq-timing-trace, ppu-state-trace, ppu-fetch-trace, phi2-write-sweep, test-roms, commercial-roms + debug-hooks, full). Result: - 16 methods have no call site at all. - poll_irq and oam_dma_in_flight are called only from the default bodies of two of those (poll_irq_at_phase, oam_dma_overlap_ready), so they are dead too; the two calls carry #[allow(deprecated)] with that reason. - 5 of the audit's 22 are LIVE and are not touched: cpu_read / cpu_write (the trait's default read / write, and the core's own calls), on_cpu_cycle (the default cpu_clock a stub bus relies on), dmc_dma_defer_load_entry and oam_dma_overlap_cycle (the core calls both). - The audit missed internal_data_bus (dead, deprecated here) and trace_instr (live: cpu.rs calls it under cpu-instr-cycle-trace). The report's own §1.4 scorecard says 18; its §4.4 list says 22 and is wrong in the five places above. `-D warnings` across the workspace is now the standing proof: a new call to any of the 18 fails the lint. §4.3, ApuBus. Nothing implements or calls it; the bus drives the DMC sample fetch through Apu::dmc_dma_pending / dmc_dma_addr / complete_dmc_dma inside the CPU's unified DMA (bus.rs 3685-3693, 3832-3836). Deprecated; the crate re-export keeps working under #[allow(deprecated)] until v2.9.0. §4.2, naming. AGENTS.md said `rustynes-core::Bus` is borrowed by the CPU during `tick()`: there is no type named Bus in rustynes-core and no tick(). The same section also still said the scheduler advances one PPU dot per `tick_one_dot()` -- the dot-lockstep design v2.0.0 retired. Both paragraphs are rewritten from the code (Cpu::step, start_cycle / end_cycle, run_ppu_to, the 12:4 and 16:5 dividers), and docs/scheduler.md likewise (it described ApuBus as live with methods it never had). The suggested `pub type Bus = LockstepBus` alias is declined: a second name for one type is the drift being reported. §4.7, three doc strings, all confirmed: zapper_temporal_light documented "default off" (on since v2.3.6) with a link to the wrong type; RomError::FdsUnsupported still read "planned for v2.2.0" -- FDS shipped in v2.2.0, and the message now says what a mobile user who opens a .fds needs to know (the image loads through the disk loader with a BIOS, not as a cartridge); the cpu.rs header described the retired on_cpu_cycle stepping interface and now describes start_cycle / end_cycle in the order the code runs them. Also adds the v2.7.5 plan and records the verdicts in the core ledger. Verified: cargo clippy --workspace --all-targets -D warnings; clippy for rustynes-apu / rustynes-core; rustdoc -D warnings on rustynes-apu and rustynes-cpu; markdownlint on the changed docs. No behaviour change: the only runtime-visible string is the FDS error text, which no test matches. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj
Carried into v2.7.5 from agy's round 4 on #551, where the per-pack decode budget (SEC-01) was introduced. decode_png checks a PNG's declared dimensions against what is left of the pack's RGBA budget, then charges the budget, then decodes the pixels. The charge is taken from the header alone so that no pixel buffer is allocated for an image that would not fit. But three paths after the charge return None without giving it back: output_buffer_size() failing, next_frame() failing (truncated or corrupt IDAT), and an unexpanded Indexed image. A corrupt image near the limit therefore spent budget that a valid image later in the same pack needed, and that image was then refused as "over budget". Bounded (nothing allocates past the budget) but wrong. The pixel half moves into decode_png_pixels, and decode_png refunds the charge whenever it returns None. The header checks and the charge are unchanged, so the SEC-01 guarantee -- no allocation for an image that does not fit -- still holds. Test a_png_that_fails_after_its_header_refunds_the_budget builds a valid 64x64 grayscale PNG and cuts it two bytes into its IDAT data, so the header parses (and is charged) and the decode fails. Red first: the budget read 0 of 16,384 after the failed decode, and the valid image at exactly the remaining budget was then refused. The red run is also what proves the truncated image reaches the charge rather than failing in read_info, which would make the test vacuous. Mutation: deleting the refund line fails it. Verified: cargo test -p rustynes-hdpack (74 passed, 1 ignored); clippy -D warnings on rustynes-hdpack all targets and on rustynes-frontend with scripting,hd-pack. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj
… none Core audit §3 and IMP-12 proposed twelve hot-path changes; v2.7.5 measured them before building any. Nothing in the engine changes in this commit: every probe was reverted, and the tree's code is exactly the previous commit's. What lands is the record in docs/performance.md, the ledger verdicts, and a correction to the plan. Method. The project's standing record is heavily against micro-optimising this core (the v2.3.1 campaign: ten items, none adopted), so the first run was ONE combined ceiling probe: every proposal at its maximum in a single tree, knowingly breaking correctness where the real change would be subtle -- CPU divider hard-coded to 12, take_dma_mc_consumed removed, sample_nmi_edge removed from all three PPU catch-up loops, branchless set_nz, the four redundant PPU stores deleted, BlipBuf::drain_all keeping its capacity, the pulse mute check deleted, the cpu_read_unmapped call skipped. The result bounds what the whole set could win, so a zero rejects all eight in one measurement with no correctness risk. scripts/perf/ab_check.sh, AB_MEASUREMENT_TIME=25, fat LTO, the four shipped workloads, each with its A/B/A order-bias control: run 1 +0.63 +1.29 +1.14 -0.54 % control +0.25 +0.39 +0.93 +2.48 run 2 void: control swung -5.5% .. +12.1% (indexers, Syncthing) run 3 +0.14 -0.07 +0.13 +0.08 % control +0.16 +0.06 -0.16 -0.00 The ceiling is zero. IMP-05 could not share that bound (inlining can move either way), and its premise, unlike v2.3.1 G7's, is true: read1, write1, end_cycle, idle_tick and adc survive as out-of-line symbols. Its candidate outlined read1's DMC-abort and unified-DMA drains as #[cold] #[inline(never)] behind a guard of the same two predicates (both pure &self, checked, so the double evaluation is exact) and hinted read1 #[inline]. The outlining took (read1_slow_path is its own symbol, confirmed with nm on the candidate build, not the reference the harness re-benches last). Run 1 void (another session's pytest; control +4.5%); run 2 clean: -0.15 -0.25 -0.11 +0.10 against control -0.18 -0.06 -0.17 +0.07. Zero. IMP-06's branchless palette got its own ceiling (palette_index is on the hot path, 61,440 calls a frame via emit_pixel -> read_palette): mirroring deleted, +0.01 +0.04 +0.34 +0.32 against control -0.18 +0.06 +0.22 +0.11. Zero. Its phase-match fold has no ceiling and was not pursued. IMP-12 is v2.3.1's G10, already rejected. Premises the measurement made moot but which were wrong anyway, recorded so nobody re-derives them: §3.1 A's "integer division" is div / 2, a shift; §3.1 B's accumulator is zero in production because the core overrides cpu_clock (its only feeder is reached from unit tests), not for the reason given; IMP-07's "eliminates per-frame allocations" cannot hold for a Vec returned by value. IMP-07's second half, a 16,384-sample cap on BlipBuf, is rejected as a behaviour change with no user. Correction: the plan committed in cf377ed said several tests and the movie round-trip drain after more than 16,384 samples. Checked, that is false -- every one drains each frame. The real case is the probe engine's undrained framebuffer trials (about 24,000 samples over 30 frames, per rustynes-probe/tests/restore_audio_pin.rs), which a cap would silently truncate. The plan now says so. MOB-06 (the mobile framebuffer copy) is deferred as blocked upstream: the fix needs UniFFI's mutable borrowed bytes (&mut [u8]), which exist only on its unreleased main; 0.32.2, the newest release, has read-only borrowed bytes. Checked in the registry sources of 0.32.1 and 0.32.2, not only the docs. With these, the core and frontend ledgers have no UNTRIAGED row left. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj
The sixth and last release of the v2.7.x audit line: every row of the core
and frontend audit ledgers now carries a verdict with its evidence. The work
is the three commits before this one; this commit is the version bump and
the release documents.
- Workspace and rustynes-cosim to 2.7.5 via bump_release.py; the nested
"Built on" chains trimmed to one level (AGENTS, README, SUPPORT,
VERSION-PLAN, to-dos/ROADMAP) as at every cut; the to-dos/ROADMAP
release-line entry written by hand, as the script requires.
- CHANGELOG [2.7.5] under a kept [Unreleased]; a VERSION-PLAN row (v2.7.4
loses "(current)"); the ROADMAP status line; the release-notes override.
- The plan's As-built table and the line plan's v2.7.5 row.
Two corrections made while writing, recorded so the history carries them:
- The README and AGENTS.md paragraphs after the current-release anchor
still described v2.7.4, and the README said v2.7.4's mobile changes "are
checked on devices by the maintainer before release". v2.7.4 has merged
and nothing in this repository records a run of that checklist, so the
text now says exactly that instead.
- The release notes first said the twelfth performance proposal was
"already measured in v2.3.1". Only one of the last two was (IMP-12, as
G10); the other, the phase-match fold, was closed by reasoning and never
measured. Fixed before commit.
Verification on this tree:
cargo test --workspace --features test-roms
154 suites, 2,718 passed, 0 failed (v2.7.4: 2,716)
AccuracyCoin (RAM decoder): total=144 pass=133 pass_with_code=11 fail=0
not_run=0
nestest: pass
clippy -D warnings: workspace, scripting+hd-pack, retroachievements, full,
both wasm32, the harness trace features, test-roms+phi2-write-sweep,
and the excluded rustynes-cosim
rustdoc -D warnings; thumbv7em no_std; ios-host-typecheck; fmt
release_anchor / release_state_prose / release_notes_render audits pass;
pre-release.sh: nothing definitively wrong
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj
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This repository does not receive automatic reviews because it has fewer than 10 stars. ⚙️ Run configurationConfiguration used: Repository: doublegate/RustyNES/.coderabbit.yaml Review profile: ASSERTIVE Plan: Advanced Run ID: 📝 WalkthroughWalkthroughRustyNES v2.7.5 updates release metadata, records audit measurements, and deprecates unused bus APIs. It corrects scheduler documentation and FDS error text, and refunds the HD pack image budget when PNG pixel decoding fails. ChangesLedger release
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Other · Severity of issue fixed: Low Merge Risk: 🟡 Moderate · up to The emulator fix is supported by its regression test, but the release’s audit claims and benchmark evidence need correction or an explicit narrowing before merge. RetroArch may also continue displaying the older version until its upstream metadata is synchronized. 🚥 Pre-merge checks | ✅ 8 | ❌ 1❌ Failed checks (1 warning)
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Antigravity review (Gemini via Ultra)This PR deprecates unused bus interfaces, reuses the audio buffer capacity across frames, prevents HD-pack budget starvation from corrupt PNGs, and updates documentation. Blocking issuesNone found. Suggestions
NitpicksNone. The implementation changes are straightforward and well-tested. Automated first-pass review by Earlier review rounds (newest first)Round reviewed at 2026-09-24 16:30 UTCAntigravity review (Gemini via Ultra)This PR finalizes the v2.7.5 "Tally" release by deprecating unused bus methods, optimizing the audio buffer's capacity retention across frames, and fixing an HD-pack budget leak for corrupt images. Blocking issuesNone found. Suggestions
NitpicksNone. Automated first-pass review by Earlier review rounds (newest first)Round reviewed at 2026-09-24 15:27 UTCAntigravity review (Gemini via Ultra)This PR deprecates unused CPU bus methods and the Blocking issues
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NitpicksNone found. Automated first-pass review by Earlier review rounds (newest first)Round reviewed at 2026-09-24 15:05 UTCAntigravity review (Gemini via Ultra)This PR finalizes the v2.7.x audits by closing core performance proposals with measurements, deprecating unused bus methods, and fixing an HD-pack memory budget leak for corrupt PNGs. Blocking issues
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Automated first-pass review by Earlier review rounds (newest first)Round reviewed at 2026-09-24 14:42 UTCAntigravity review (Gemini via Ultra)This PR finalizes the v2.7.5 release by documenting audit measurements, deprecating unused Blocking issuesNone found. Suggestions
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Automated first-pass review by Earlier review rounds (newest first)Round reviewed at 2026-09-24 13:18 UTCAntigravity review (Gemini via Ultra)
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Copilot review overview
🟡 Changes recommended
Unresolved documentation, measurement-evidence, and regression-coverage issues remain.
Get a fresh assessment by requesting another Copilot review.
Review effort: Lite
Findings: 3
Open (3)
What changed in this PR
This PR releases v2.7.5 “Ledger,” updating audit and release documentation, deprecating obsolete interfaces, and fixing HD-pack budget recovery after PNG failures.
Changes:
- Bumps release and workspace metadata.
- Records audit and performance outcomes.
- Updates architecture and user documentation.
- Improves FDS errors and HD-pack accounting.
| File | Description |
|---|---|
VERSION-PLAN.md |
Adds v2.7.5 release entry. |
to-dos/ROADMAP.md |
Updates roadmap status. |
to-dos/plans/v2.7.x-core-frontend-audit-plan.md |
Records audit completion. |
to-dos/plans/v2.7.5-ledger-plan.md |
Adds Ledger plan and results. |
SUPPORT.md |
Updates supported release. |
SECURITY.md |
Updates security version guidance. |
ROADMAP.md |
Updates project status. |
README.md |
Updates release details and badge. |
OVERVIEW.md |
Updates applicable release. |
docs/scheduler.md |
Corrects scheduler architecture. |
docs/performance.md |
Records performance measurements. |
docs/audits/frontend-disposition.md |
Records frontend audit outcomes. |
docs/audits/core-disposition.md |
Records core audit outcomes. |
crates/rustynes-mappers/src/cartridge.rs |
Improves FDS error messaging. |
crates/rustynes-libretro/rustynes_libretro.info |
Updates display version. |
crates/rustynes-hdpack/src/hdpack.rs |
Refunds failed PNG budget charges. |
crates/rustynes-cpu/src/cpu.rs |
Updates CPU documentation. |
crates/rustynes-cpu/src/bus.rs |
Deprecates unused bus methods. |
crates/rustynes-cosim/Cargo.toml |
Synchronizes excluded-crate version. |
crates/rustynes-cosim/Cargo.lock |
Synchronizes cosimulation dependencies. |
crates/rustynes-core/src/bus.rs |
Updates Zapper documentation. |
crates/rustynes-apu/src/lib.rs |
Preserves deprecated re-export. |
crates/rustynes-apu/src/apu.rs |
Deprecates ApuBus. |
CHANGELOG.md |
Adds v2.7.5 release notes. |
Cargo.toml |
Bumps workspace version. |
Cargo.lock |
Updates workspace package versions. |
ARCHITECTURE.md |
Updates applicable release. |
AGENTS.md |
Updates release and architecture guidance. |
.github/release-notes/v2.7.5.md |
Adds authored release notes. |
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Copilot round 1 on #553; all three findings held. README: the release cut trims the current-release anchor's nested "Built on" chain to one level, and the anchor now names v2.7.4 as its base. The paragraph after it still opened its own chain at "Built on v2.7.2" -- which was consistent at v2.7.4, when the anchor named v2.7.3, and skips v2.7.3 "Hearth" now. The paragraph names Hearth again. This is the second release running where the paragraph after the anchor went stale because the bump script rewrites only the anchor; worth remembering at the next cut. OVERVIEW.md and ROADMAP.md carried "Last Updated: 2026-09-17" beside content that states a 2026-09-24 release; both refreshed. bump_release.py does not touch these fields. Verified: release_anchor_audit and release_state_prose_audit pass; markdownlint on the three files. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj
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Replies to the Antigravity round-1 review. It found no blocking issues, and nothing here needs a change.
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Actionable comments posted: 5
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In @.github/release-notes/v2.7.5.md:
- Line 9: Update the release summaries to distinguish the twelve proposals’
dispositions from measurement: the `match` proposal had no measurable ceiling
and was not pursued, while the other proposals were measured. In
.github/release-notes/v2.7.5.md lines 9–9, revise the heading; in CHANGELOG.md
lines 37–38, remove “each with its number” and qualify the blanket measurement
claim; qualify the current-release claims in OVERVIEW.md lines 25–25, README.md
lines 677–677 and 682–683, ROADMAP.md lines 11–11, SUPPORT.md lines 97–97,
VERSION-PLAN.md lines 3–3, docs/STATUS.md lines 3–3, and to-dos/ROADMAP.md lines
60–60; distinguish the unmeasured disposition from measured proposals in
VERSION-PLAN.md lines 150–150 and qualify the release-line history in
to-dos/ROADMAP.md lines 66–66.
In `@crates/rustynes-cpu/src/cpu.rs`:
- Line 20: Update the cycle-count documentation in `Cpu::idle_tick`’s
surrounding module docs to distinguish clocked internal cycles from CPU bus
accesses; do not claim every cycle performs a bus access. Make the same
distinction in `AGENTS.md` at line 157, so both documentation sites accurately
describe the implementation.
In `@crates/rustynes-libretro/rustynes_libretro.info`:
- Line 8: Update the separate RetroArch metadata copy so its display_version
matches v2.7.5, consistent with the value in rustynes_libretro.info.
In `@docs/performance.md`:
- Around line 853-855: Update the benchmark ledger in the performance proposals
so each item has an isolated ceiling or candidate run and a second independent
run; do not use the combined eight-proposal probe to establish individual
effects. Add the required usable IMP-05 and palette-mirror runs and record their
measurements, or narrow their conclusions and mark them unverified.
In `@to-dos/plans/v2.7.x-core-frontend-audit-plan.md`:
- Line 50: Correct the As built performance summary in the v2.7.5 plan: state
that ten proposals were measured and rejected in v2.7.5, IMP-12 was rejected
based on its v2.3.1 measurement, and the phase-match fold was closed by
reasoning; retain that none were adopted and leave the planned release scope
unchanged.
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📒 Files selected for processing (28)
.github/release-notes/v2.7.5.mdAGENTS.mdARCHITECTURE.mdCHANGELOG.mdCargo.tomlOVERVIEW.mdREADME.mdROADMAP.mdSECURITY.mdSUPPORT.mdVERSION-PLAN.mdcrates/rustynes-apu/src/apu.rscrates/rustynes-apu/src/lib.rscrates/rustynes-core/src/bus.rscrates/rustynes-cosim/Cargo.tomlcrates/rustynes-cpu/src/bus.rscrates/rustynes-cpu/src/cpu.rscrates/rustynes-hdpack/src/hdpack.rscrates/rustynes-libretro/rustynes_libretro.infocrates/rustynes-mappers/src/cartridge.rsdocs/STATUS.mddocs/audits/core-disposition.mddocs/audits/frontend-disposition.mddocs/performance.mddocs/scheduler.mdto-dos/ROADMAP.mdto-dos/plans/v2.7.5-ledger-plan.mdto-dos/plans/v2.7.x-core-frontend-audit-plan.md
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Core audit IMP-07, adopted after review on #553 exposed that my first measurement of it measured nothing. The change: BlipBuf::drain_all returned the filled buffer with mem::take, leaving a buffer of capacity zero that the next frame regrew by doubling (about nine reallocations for a frame's ~800 samples). It now replaces it with Vec::with_capacity(previous capacity): one allocation of the size the last frame needed. A buffer returned by value has to be replaced on every call, so the audit's "eliminates per-frame allocations" cannot hold; what changes is how many. The correction. v2.7.5's combined ceiling probe included this change and the record said the probe bounded it at zero. It could not have: the stock full_frame benches restore a snapshot per iteration (which replaces the BlipBuf) and never drain audio, so drain_all never runs in them. CodeRabbit questioned the combined probe's per-item bound on #553; checking the bench for this item is how the gap surfaced. The measurement it needed: a temporary (uncommitted) bench on the shape Nes::drain_audio callers actually have -- one frame, then a drain, on the same machine every iteration -- run as a manual A/B/A with criterion baselines, pinned to cores 2-5, 25 s per measurement: run reference candidate control (reference again) 1 3.958 ms 3.924 ms (-0.89%) 3.939 ms (-0.52%) 2 3.952 ms 3.916 ms (-0.89%) 3.959 ms (+0.22%) p = 0.00 both runs; the candidate is the fastest measurement in both, with the controls on either side of the reference. Under ab_check.sh's adoption rule (the v2.3.1 maintainer decision: a consistent, reproduced, clean gain is adoptable below 3%) this is adopted. AGENTS.md's hot-path note still says ">3%"; the conflict is flagged in the PR rather than decided here. Who it affects: callers of Nes::drain_audio -- the mobile bridge and the wasm build. The desktop and libretro drain with drain_audio_into into their own buffer (BlipBuf::drain), which allocates nothing and is untouched. The samples are not touched either, so audio is byte-identical by construction. Test drain_all_keeps_room_for_the_next_frame, red first (capacity 0 against 717 drained samples); reverting to mem::take fails it. cargo test -p rustynes-apu: 157 passed. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj
CodeRabbit on #553. The rewritten cpu.rs header (cf377ed), like the AGENTS.md paragraph written with it, said every CPU cycle is a real bus access. Cpu::idle_tick calls start_cycle and end_cycle with no access between them, so for internal cycles that is false. The header now says what the code does: every cycle is clocked in two halves; read1 / write1 perform their access between them; idle_tick runs both halves with no access. Comments only. The matching AGENTS.md paragraph lands with the release-document commit that follows, since that file also carries the codename change. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj
CodeRabbit round 1 on #553 made five findings; four held and one is declined. Acting on them changed the release in two ways. 1. The codename. v2.7.5 was "Ledger", which v2.3.4 already is. Multi-release line names repeat by design ("Fathom", "Harbor"), but two unrelated standalone releases sharing one would make the tags and release titles ambiguous. Renamed to "Tally" everywhere v2.7.5 is named; the plan file moves to to-dos/plans/v2.7.5-tally-plan.md. v2.3.4 "Ledger" is untouched, as is the word ledger for the audit ledgers. 2. One performance proposal is adopted. CodeRabbit challenged the combined ceiling as a per-item bound (offsets can hide an individual effect). Checking each item for that found IMP-07 could never have been bounded by it: the full_frame benches never drain audio. Measured on a frame-then-drain bench it is -0.89% on two runs and was adopted in 8aba4e3. IMP-04, the one rewrite in the set, was run alone twice: zero. IMP-05 got a third run and the palette ceiling a second: zero. So the record now reads twelve proposals closed, eleven by measurement, one adopted -- in docs/performance.md (the section rewritten: IMP-07 taken out of the combined table with the reason, the new runs' tables, the decision heading), the core ledger, the CHANGELOG, the release notes, the plan, the line plan, and every current-release anchor. 3. "Twelve measured" was an overclaim even before that: the phase-match fold was closed by reasoning. Every anchor now says eleven by measurement. 4. AGENTS.md's architecture paragraph said every CPU cycle is a bus access; idle_tick's are not. It now says what cpu.rs's header says since bb2018e. Declined: syncing the upstream libretro-super .info now. The plans put the local metadata fix at v2.8.1 and the upstream sync at v3.0.0. Also: the notes' verification rows name both red-first tests, and the "two clean runs" wording is narrowed to what is true (two runs read against their own controls; runs whose control swung by several percent reported as void). Verification on this tree (blip.rs changed in 8aba4e3, so all re-run): cargo test --workspace --features test-roms: 154 suites, 2,719 passed, 0 failed (+1: the IMP-07 test) AccuracyCoin (RAM): total=144 pass=133 pass_with_code=11 fail=0 not_run=0 fmt; clippy -D warnings workspace, full, both wasm32; rustdoc; no_std; release_anchor 15/15, release_state_prose 2/2, release_notes_render 8/8 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj
doublegate
changed the title
agy and CodeRabbit on #553, after the IMP-07 adoption. drain_all (agy). Keeping the previous capacity made it a high-water mark: a caller that once let audio pile up would leave a buffer that size resident for as long as the BlipBuf lives. The probe engine's undrained trials reach ~24,000 samples; the new test's one-second backlog kept 65,536 slots. The kept capacity is now clamped at DRAIN_ALL_KEEP_CAPACITY = 4,096 samples, four frames at 48 kHz. A per-frame drain keeps ~1,024 slots, below the clamp, so the path measured at -0.89% is unchanged by it. Test drain_all_does_not_keep_a_high_water_mark: red first ("kept 65536 after a 47982-sample backlog"); removing the clamp fails it. Claims (CodeRabbit, second pass): - AGENTS.md's Timebase bullet still said "every CPU cycle a real bus access" -- the same overstatement bb2018e fixed in the architecture paragraph, in text that predates this release. Now: every cycle clocked in two halves, any access split between them. - The VERSION-PLAN row said the twelve proposals "were measured before any was built" with a probe covering "every proposal"; now ten measured here, IMP-12 in v2.3.1, the phase-match fold by reasoning, and a probe over seven. - The CHANGELOG heading "the core audit's proposals, measured" drops the last word; its bullets already give the breakdown. Declined (agy): turning decode_png's Option into a Result. None for "an image this loader cannot use" is the function's documented contract since v2.7.3; this release only moved lines within it. Verified: cargo test --workspace --features test-roms: 154 suites, 2,720 passed, 0 failed (+1); cargo test -p rustynes-apu 158 passed; clippy -D warnings on rustynes-apu; fmt; release anchor and prose audits; markdownlint. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj
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agy on #553 (017173f). With the capacity kept between frames, a drain with nothing queued allocated a replacement buffer and handed back the old, empty one for the caller to free: one allocation and one free for no samples. It now returns Vec::new(), which does not allocate, and leaves the buffer as it is. Output is unchanged. Test an_empty_drain_all_allocates_nothing, red first (the empty drain handed out a 4,096-slot buffer); removing the early return fails it. The same round's blocking finding, a u32 overflow in the HD-pack budget arithmetic, is refuted: the quoted expression is not in the file, which has widened both factors to u64 before multiplying since v2.7.3. Verified: cargo test --workspace --features test-roms: 154 suites, 2,721 passed, 0 failed (+1); cargo test -p rustynes-apu 159 passed; clippy -D warnings on rustynes-apu; fmt. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj
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Maintainer instruction on #553: AGENTS.md carries the same language as scripts/perf/ab_check.sh. AGENTS.md said every optimization "must clear the project's >3% same-runner A/B bar and stay byte-identical". ab_check.sh -- the tool that adjudicates adoption -- records the v2.3.1 maintainer decision that the bar is evidence quality, not effect size: a consistent, reproduced, statistically clean gain is adoptable even below 3%, the second independent run is not negotiable, and a mixed-sign result across workloads is a rejection. The two disagreed, and v2.7.5's IMP-07 (-0.89%, reproduced) was adopted under the script's rule with the conflict flagged in the PR. AGENTS.md now states the script's rule, keeps byte-identity as a hard requirement, and notes that older docs/performance.md records cite the bar in force when written. Two other live statements of the rule are aligned: docs/audits/README.md (the standing rules an audit fix is checked against) and the v2.7.x line plan's v2.7.5 criterion, which said "kept only above 3%" beside an As-built row that adopts a 0.89% gain; it carries a dated note rather than a silent rewrite. Historical records in docs/performance.md, older plans, and the separate pgo.yml promotion gate are left as written: they describe decisions taken under the rule of their day. Markdown only; markdownlint passes on the three files. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj
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* perf(ppu): measure the v2.7.5 deletions alone; all six are zero v2.7.5 applied seven of the core audit's performance proposals in one tree and measured the combined ceiling. That bounds their SUM. Six of the seven are deletions of work, and v2.7.5 trusted the sum on the reasoning that a deletion cannot make the core slower except through code layout. That was reasoning, not measurement, with two holes: layout effects are the size of the gains being looked for, so one item's gain could hide behind another's layout loss; and a bench can fail to reach the code at all, which is exactly how IMP-07 sat inside the combined zero until #553. So each deletion was re-run on its own (maintainer request). Method: each probe applied alone to main (0eb48bc), identical to its part of the combined tree; scripts/perf/ab_check.sh, AB_MEASUREMENT_TIME =25, two independent runs per item, each with its A/B/A order-bias control; i9-10850K, load average 1.5-3.0. Every probe was also hashed over 180 frames (framebuffer + audio + final cycle) on both bench ROMs and both dot paths: all six byte-identical to the unprobed build. Result, per item: zero. No workload beat its control in both runs. The cells that stand out are SLOWER and do not repeat (A flowing_palette_fast -0.26% then +1.93%; B nestest -0.23% then +5.46%; C exact path flat then +1.5/+1.8%). Full table in docs/performance.md §v2.7.6. What the per-item look found beyond timing: - IMP-06: three of the four fast-path stores wrote `true` into prev_rendering_enabled / rendering_enabled_delayed / _delayed2, which the guard in `tick` already requires to be true, so each store wrote the value already held. Their comment claimed they were kept "to stay byte-identical across a fast->general boundary"; writing an unchanged value cannot affect that. They are replaced by a debug_assert! of the invariant: byte-identical in release, checked in debug and test builds. bg_reload_render is NOT in the guard, so its store stays. - The assertion needed its own test, and finding that out is the trap worth keeping. Mutating the guard (dropping prev_rendering_enabled, then dropping every history term) left fast_dotloop_diff (5 tests) green both times: mask_write_delay == 0 alone keeps every lagging-history dot in the corpus off the fast path, so no ROM reaches the violating state. fast_render_path_asserts_its_rendering_history enters the fast body with a lagging history and requires the panic; restoring the old stores turns it red (mutation caught). - §3.1 C's sample_nmi_edge is dead work, not merely cheap: it fills nmi_edge_latch, whose only reader is poll_nmi, deprecated in v2.7.5 with no caller since v2.0.0; the live CPU detects the edge from nmi_level(). §3.1 B checks an accumulator only a unit-test path feeds. NOT removed here: doing it properly removes the deprecated trait methods too, which ADR 0041 reserves for v2.9.0 (maintainer decision, held). Removing the internals alone would leave poll_nmi answering wrongly. - §3.5b and §3.6 are byte-identical on these workloads only because they never mute a pulse or read an unmapped address; those probes delete correct behaviour and are ceilings, not candidates. Verified: cargo fmt; clippy --workspace --all-targets -D warnings clean; rustynes-ppu lib tests pass (+1 new); fast_dotloop_diff 5/5 in a debug build (assertion live); AccuracyCoin and nestest pass; release anchor and state-prose audits pass; no_std thumbv7em build. The full --features test-roms suite is NOT yet run on this branch. Docs: performance.md §v2.7.6 (and a pointer from §v2.7.5), the core audit ledger rows IMP-06 / §3.1 / §3.5b / §3.6, CHANGELOG [Unreleased]. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj * chore(release): cut v2.7.6 "Recount" The measurement release between the v2.7.x and v2.8.x audit lines: the six v2.7.5 deletions measured one at a time (all zero), the IMP-06 stores stated as an assertion, and #554's contributed libretro buildbot work, which had been waiting under [Unreleased]. - CHANGELOG: [2.7.6] cut below a kept [Unreleased], with a lead paragraph. - bump_release.py moved every anchor to 2.7.6 (Cargo.toml, both cosim manifests and lock, the libretro .info display version, ARCHITECTURE, OVERVIEW, README, SECURITY, SUPPORT, STATUS, VERSION-PLAN, ROADMAPs, AGENTS). It first REFUSED on ROADMAP.md's status line, which had no chain to extend; that line was written by hand, then the script ran. - The nested "Built on" chains trimmed to one level in AGENTS, README, SUPPORT, VERSION-PLAN, ROADMAP.md and to-dos/ROADMAP.md; OVERVIEW, SECURITY and STATUS keep the full chain, as before. - The README and AGENTS paragraphs after the anchor rewritten for v2.7.6; both still described v2.7.5 after the bump, the same stale-paragraph trap as the last two releases. - VERSION-PLAN row (current moved), to-dos/ROADMAP chain tail, plan doc to-dos/plans/v2.7.6-recount-plan.md, release notes v2.7.6.md. - .github/release-notes/v2.7.5.md gains the "Libretro cores (added after release)" section already published on the v2.7.5 GitHub release, so the committed notes match what is live. - Cargo.lock: `cargo update -w` for the workspace version only (19 lines, no dependency moved). Verified on this tree: cargo test --workspace --features test-roms, 154 suites, 2,722 passed, 0 failed, 20 ignored (v2.7.5 recorded 2,721; the +1 is the new assertion test). release_anchor_audit 15, state_prose 8, release_notes_render 2, libretro_info 3: all pass. pre-release.sh: nothing definitively wrong. markdownlint on every changed file: pass. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj * docs(perf): §3.5b was never reached; measured where it runs, ~0.2% Correction to this release's own claim that all six v2.7.5 deletions are zero. CodeRabbit (#555) asked for the §3.5b and §3.6 conclusions to be qualified; checking what each probe actually reached found that §3.5b's had measured nothing. Mechanism: Pulse::output tests `length.count == 0` first and short-circuits, and both bench ROMs (nestest, flowing_palette) are silent. Counted with a temporary AtomicU64 in muted(): 0 calls per frame on each. So v2.7.5's combined probe AND this release's individual run deleted code that never executed -- the IMP-07 failure again. §3.6 was checked the same way and IS reached: 24,832 cpu_read_unmapped calls a frame on nestest, 3,968 on flowing_palette, so its zero stands. Remeasured: a scan of the committed ROMs found several at 59,561 muted() calls a frame (both pulses, every CPU cycle). spritecans.nes, temporary run_frame bench, fast dot path, manual A/B/A, taskset 2-5, 25 s: ceiling (check deleted) -0.10% (p=0.02) / -0.14% (p=0.01) controls +0.05% (p=0.11) / +0.08% (p=0.17) A reproduced ceiling of about 0.2%. The cheapest correct change -- test the duty step before muted(); all three predicates are pure, so order cannot change the result -- measured +0.67% / +0.67% SLOWER against controls of -1.25% / +0.47%. Caching the sweep target would add a field kept in step with four register paths and the save state for at most 0.2%; not built. §3.5b stays REJECTED, now on a measurement that reaches it. No code changes in this commit; the probes and the temporary bench were reverted (tree verified clean before and after). Also from CodeRabbit (#555): the v2.7.5 notes said the Online Updater is the way to get the core "on every platform". On iOS and tvOS it cannot add a core -- every core is part of the signed app. Corrected in the committed notes and on the published v2.7.5 release. Also corrected: my own wording "no byte-identical way to take it" was too strong (caching would be byte-identical); now "the cheap byte-identical way measured slower". And a stray table substitution had turned "IMP-06" into "IMP−06" in performance.md. Every "all six are zero" in the anchors, CHANGELOG, VERSION-PLAN, ROADMAPs, plan, release notes and ledger now says five, with §3.5b's number. Verified: release anchor 15 / notes render 2 / state prose 8 pass; markdownlint pass; pre-release.sh clean. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj * docs: state the zero verdicts' resolution; drop the shipped v2.7.x plan row CodeRabbit round 2 on #555, both taken. 1. docs/performance.md: the five zero verdicts now say what "zero" means as a number. The order-bias controls moved by under 0.6% on most workloads and by up to 2.4% on a few (A run 2, C run 2, IMP-06), so each candidate is read against its own control, and an effect below roughly half a percent cannot be excluded from these runs. The method's sensitivity at that scale is shown, not assumed: the same A/B/A, pointed at a path the workload executes (§3.5b on spritecans.nes), resolved 0.10% and 0.14% at p <= 0.02 against flat controls. No new positive-control run was made; the §3.5b measurement already is one on the same procedure. Correction inside this commit's own drafting: a first version said the controls moved "up to about 0.3%". The table in the same section shows +1.89%, +2.04%, +1.97% and -2.43%; the text now matches the table. 2. VERSION-PLAN.md: "Planned next (not yet released)" still listed v2.7.x, which has shipped in full (v2.7.0 through v2.7.6). Stale since v2.7.5. Row removed; v2.8.x is now the first planned line. (CodeRabbit's line reference pointed at the shipped-history row, which is correct where it is; the finding's substance was the planned table.) Verified: release_anchor_audit 15 and release_state_prose_audit 8 pass; markdownlint pass. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj * docs(release): close the v2.7.6 notes with the required Install block Copilot (#555): .github/release-notes/README.md requires every override to end with a `## Install` block (binaries, web build, links, license); v2.7.6.md stopped after Verification, so the published release body would have carried no installation pointers. The drift is older than this release: v2.7.2 through v2.7.5 all omit the block too. The last notes that carry it are v2.6.23's, whose three lines this follows, plus the RetroArch Online Updater and links to the measurement record and the plan. The earlier v2.7.x notes are left alone here: their published release bodies match the committed files, and backfilling only the files would split them. Verified: release_notes_render_audit 2 pass; markdownlint pass. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj * docs(release): backfill the Install block on the v2.7.2-v2.7.5 notes The release-notes contract (.github/release-notes/README.md) requires every override to close with a `## Install` block. v2.7.2 through v2.7.5 all omitted it -- v2.6.23 is the last notes file that had one -- which Copilot's review of v2.7.6 surfaced (maintainer: backfill them too). Each file gains the block in v2.6.23's form (binaries, web build, license) plus a link to that release's plan and the CHANGELOG. v2.7.5's also points at the RetroArch cores attached to that release after it shipped. Committed file and published body are kept identical: each updated file was published as its release body with `gh release edit --notes-file`, then read back and compared in Python -- equal apart from the single trailing newline GitHub appends. Before the edit the only differences between each published body and its file were blank lines. Verified: markdownlint pass; release_notes_render_audit 2 pass. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj * docs: stop four documents naming v1.8.8 as the current release Copilot (#555, review of 9cf40ef) noted stale v1.8.8 release anchors in the navigation and status documents. Four still called v1.8.8 "Atlas" (2026-06) current, roughly forty releases on: - docs/DOCUMENTATION_INDEX.md: the version line and the intro sentence - to-dos/README.md: the version and project-status lines - docs/user-guide/compatibility.md: "held byte-identically through every release up to and including the current v1.8.8" -- also wrong in a second way, since v2.0.0 broke byte-identity by design (ADR 0003) - docs/ra-integration-request.md: "cite the current stable release (v1.8.8)" None is covered by release_anchor_audit or bump_release.py, which is why each drifted: a pinned version literal that no release step touches. Bumping them to v2.7.6 would restart the same drift, so each now points at the maintained source (docs/STATUS.md's "Current release" line, or to-dos/ROADMAP.md) and says it deliberately does not repeat the number. The compatibility sentence drops the byte-identity-through claim for "re-measured on every release". Swept for the same shape elsewhere (`current [stable ]release ... vX.Y.Z` and `RustyNES version:** vX`, excluding changelogs, archives, plans and release notes): no other hit that is not v2.7.6. Verified: release_anchor_audit 15, release_state_prose_audit 8 pass; markdownlint pass. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj --------- Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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v2.7.5 "Tally": every audit claim closed with a measurement or a reason
The last release of the v2.7.x audit line (ADR 0041). The core and frontend ledgers in
docs/audits/now have no untriaged row. Plan:to-dos/plans/v2.7.5-tally-plan.md. Release notes:.github/release-notes/v2.7.5.md.(Originally cut as "Ledger". Renamed because v2.3.4 is already "Ledger".)
No emulation behaviour changes. The engine diff is deprecation attributes, doc strings, one error message, and one allocation change. The allocation change leaves audio byte-identical; AccuracyCoin, nestest and every golden are unaffected.
Commits
refactor(core): 18 deadrustynes_cpu::Busmethods andApuBusmarked#[deprecated], and the architecture drift corrected (§4.2 to §4.4, §4.7). The list comes from the compiler rather than grep: 5 of the audit's 22 "dead" methods are live.fix(hdpack): refund the pack budget when a PNG fails after its header (carried over from agy on v2.7.3 "Hearth": the desktop and web frontends keep what they are given #551). Red first, mutation caught.docs(perf): the performance record. Every probe was reverted.chore(release): the version bump and release documents.docs(release): Copilot round 1 (README lineage, two dates).perf(apu): IMP-07 adopted.drain_allkeeps its capacity between frames.docs(core): internal CPU cycles have no bus access (CodeRabbit).docs(release): the codename change, and the record updated for IMP-07.fix(apu): the capacitydrain_allkeeps is clamped at 4,096 samples, so a one-off backlog is not kept as a high-water mark (agy); the last claim corrections (CodeRabbit).perf(apu): an emptydrain_allallocates nothing (agy).docs: the performance adoption rule stated asab_check.shrecords it (maintainer instruction).Performance
drain_allcapacity, frame-then-drain A/B/AmatchfoldIMP-07 was first counted among the combined probe's zeros. The stock
full_framebenches never drain audio, so the probe could not have seen it; checking for that, after CodeRabbit challenged the combined bound, is what found it. Full numbers:docs/performance.md§v2.7.5.Verification
cargo test --workspace --features test-romsrustynes-cosim-D warnings,no_std, ios-host-typecheckFor the maintainer
AGENTS.md(anddocs/audits/README.md, and the v2.7.x plan's criterion) now stateab_check.sh's evidence-quality rule, under which IMP-07 was adopted.Deferred
&mut [u8]). They exist only on its unreleasedmain; 0.32.2 has read-only borrowed bytes.🤖 Generated with Claude Code
https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj