release: cut v2.1.8 "Fathom" (performance — "Tempo")#292
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Cuts the v2.1.8 release — the performance step of the v2.1.5 → v2.2.0 "deepen the existing project" run. Bumps the workspace version 2.1.7 → 2.1.8, renames the CHANGELOG `[Unreleased]` section to `[2.1.8]`, refreshes Cargo.lock, syncs the README badge / current-release paragraph / BibTeX, and authors `.github/release-notes/v2.1.8.md`. v2.1.8 is profile-first performance work, every change byte-identical (or default-off behind a runtime knob), on the byte-identical default core (AccuracyCoin 141/141, nestest 0-diff, visual_regression / pal_apu_tests unchanged): - #284 — specialized visible-scanline fast PPU dot path (profiled: Ppu::tick was 46.5% of frame self-time), ~12% faster on rendering-heavy frames, shipped default-OFF (Nes::set_fast_dotloop) and differential-tested bit-identical to the exact path across the corpus (incl. the v2.1.7 Rp2c02G corruption path). - #286 — vectorized software palette->RGBA blitter (scalar/wide/wasm-simd128, SIMD==scalar byte-identical; memory-bound so scalar stays default per the >3% bar) + a wasm size pass (wasm-opt -O4 -> 3.99 MiB gzip, under budget). No default-build behavior change. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Pull request overview
Prepares the repository for the v2.1.8 “Fathom” (“Tempo”) release by updating workspace versioning and user-facing release documentation/notes, aligning the README and changelog with the new release entry and release automation expectations.
Changes:
- Bumps the workspace version to 2.1.8 and refreshes
Cargo.lockcrate version entries. - Adds v2.1.8 release notes and updates
CHANGELOG.mdwith the new release header/section. - Updates
README.mdto reflect the new current release and version badge/BibTeX version.
Reviewed changes
Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.
Show a summary per file
| File | Description |
|---|---|
| README.md | Updates the version badge, “Current Release” section, and BibTeX version to 2.1.8. |
| CHANGELOG.md | Adds the v2.1.8 release header/section under the changelog’s top-level structure. |
| Cargo.toml | Bumps [workspace.package] version from 2.1.7 to 2.1.8. |
| Cargo.lock | Updates workspace crate package versions to 2.1.8. |
| .github/release-notes/v2.1.8.md | Adds the release body used by release-auto for v2.1.8. |
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…-bound) Adopts Copilot's nit on the v2.1.8 release PR: 'vectorized blitter' could imply a SIMD speedup, but scalar stays the default because palette->RGBA is a memory-bound LUT gather (no path clears the >3% bar). Reworded to 'SIMD-validated blitter paths ... not a shipped speedup' so the byte-identical-but-non-default reality is clear upfront rather than only in the trailing parenthetical. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
doublegate
enabled auto-merge (squash)
July 12, 2026 06:12
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Cuts v2.1.8 — the performance step of the v2.1.5 → v2.2.0 "deepen the project" run (profile-first, byte-identical or default-off).
Release mechanics
Cargo.toml+Cargo.lock); CHANGELOG[Unreleased]→[2.1.8] "Tempo"; README badge/current-release/BibTeX;.github/release-notes/v2.1.8.md.What v2.1.8 collects (merged)
Sacred gates (held)
fast_dotloop_diff); SIMD blitter byte-identical to scalar → shipped build byte-identicalvisual_regression/pal_apu_testsunchangedrelease-autotagsv2.1.8, publishes from the notes, builds + attaches binaries on merge-to-green.🤖 Generated with Claude Code