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wai-rs: the JPEG AI exact decoder calls no platform math library, and its output is pinned
The exact decoder's only math-library calls were `exp` in the gain scaler
and, on some targets, the float-to-integer roundings. Those results could
differ between platform math libraries, so the decoded bytes could differ
between machines.

- `float_repro` provides `exp` and the roundings built only from IEEE-754
  basic operations, so their bits are the same on every conforming target.
  Its unit tests pin their bits over a fixed grid of inputs and compare them
  with the host's own functions.
- Two guards keep the decode path free of math-library calls. Clippy's
  `disallowed_methods` (wai-rs/clippy.toml) is denied in each module on the
  path, however the call is spelled. tests/jpegai_decode_symbols.rs fails if
  the linked decoder imports a C math-library function.
- tests/jpegai_cross_platform.rs pins the decoded bytes of the `jpegai/v1`
  inputs and the bits of the float values reported after each stage. They
  were measured identical on macOS arm64, wasm32-wasip2, Linux arm64 (glibc)
  and Linux x86_64 (glibc, under user-mode emulation). Not measured: macOS
  x86_64, Windows, x86_64 hardware, 32-bit targets. The test skips unless its
  inputs are supplied.
- The gain-scaler margin tool now models the reference software's float32
  arithmetic and corrects `log_k`.
- determinism-tiers' evidence table records the measurement and its limits.
  The registry class of `wai.image.jpegai` is unchanged (NeuralEntropyExact).

Co-Authored-By: Claude Opus 5.5 <[email protected]>
2026-09-28 18:30:35 -04:00
..
workflows wai-rs: the JPEG AI exact decoder calls no platform math library, and its output is pinned 2026-09-28 18:30:35 -04:00