mirror of
https://github.com/imjasonh/nescript
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20a244b9e7
Commit 76d0fd0 moved function-locals from a codegen-minted
`$0300+` absolute range into the analyzer's zero-page
allocations so inline-asm `{param}` substitutions resolve
correctly (compiler-bugs.md #1). Observable semantics are
preserved — the analyzer + codegen now agree, and every
primitive that used to work still does — but the emitted ROM
bytes change whenever a function reads or writes a local,
because zero-page addressing uses a 2-byte instruction and
absolute addressing uses 3.
Consequences that need regenerated artifacts:
- **Twelve committed `.nes` files are stale.** Same source, new
compiler, different bytes. The `Build Examples` CI job
rebuilds each example into a tmp path and diffs against the
committed ROM, so any drift is a hard failure. Rebuilt all
twelve (arrays_and_functions, bitwise_ops, coin_cavern,
function_chain, loop_break_continue, mmc1_banked, platformer,
pong, sprites_and_palettes, state_machine, structs_enums_for,
war).
- **Three goldens drift by one animation frame.** Zero-page
addressing shaves a cycle per local access, which over a full
frame handler shifts timing-sensitive sequences by a cycle or
two. war's dealing animation and platformer + pong's audio
tick stream catch the shift at frame 180 — war's card under
player A's deck is now one frame earlier in its slide, and all
three programs' captured audio buffers start from slightly
different envelope positions. The new goldens (`war.png` + the
three `.audio.hash` files) reflect the same code compiled with
the cycle-count-corrected primitives.
- **`platformer.gif` and `war.gif` rebuild.** Same one-frame
timing drift, integrated across 360 frames of captured
gameplay — the emulator job's gif-reproducibility check
wouldn't pass without the refresh. `pong.gif` happened to
byte-match the old capture after rebuild.
All verified:
- `cargo clippy --all-targets -- -D warnings` clean on both
rustc 1.94.1 and 1.95.0.
- `cargo test --all-targets` — 616 + 3 + 75 tests pass.
- Full emulator harness — 34/34 ROMs match goldens.
- Committed-ROM reproducibility diff clean — every
`examples/*.ne` compiles byte-identical to its committed
`.nes`.
- `docs/{platformer,war,pong}.gif` byte-match fresh captures.
- SHA-256 of "NES" still computes to `AE9145DB…4E0D`.
https://claude.ai/code/session_01FRmSBruVWCufm3LsUVMs8v
24 KiB
24 KiB