Claude 0b5470b054 codegen: skip parameter-spill prologue for leaf functions ... Leaf functions — those that never JSR another routine from inside their body — don't need to spill the `$04..$07` parameter transport slots into per-function RAM, because nothing inside the body clobbers those slots. Detect them in `IrCodeGen::new` via a linear scan over each function's IR ops, point their parameters at `$04..$07` directly in `var_addrs` (and in a parallel `leaf_param_overrides` map for inline-asm `{name}` substitution), and have `gen_function` skip the spill prologue. The "leaf" predicate is conservative: any of `IrOp::Call`, `Mul`, `Div`, `Mod`, `Transition`, or an inline-asm body containing a `JSR` token disqualifies the function. SetPalette / LoadBackground / PlaySfx / StartMusic / DebugLog / DebugAssert were verified by inspection to not emit JSRs. Per call to a leaf primitive: `LDA $04 / STA <local> / LDA $05 / STA <local+1>` is now omitted — saves 12 cycles and 12 bytes of code per call. Across the SHA-256 example's ~5500 leaf-primitive calls per block, that's ~66K cycles saved per compression — about 2.2 frames at NTSC. The fix also touches every committed `examples/*.nes` (the leaf prologue was emitted by every fun with params, not just the SHA ones), so 9 ROMs and the same three timing-sensitive goldens (war.png + platformer/pong/war audio hashes) get refreshed; the two committed gifs that drifted do too. Verified: cargo test/clippy/fmt clean on rustc 1.95.0; emulator harness 34/34; reproducibility diff clean; SHA-256 of "NES" still computes to AE9145DB…4E0D. https://claude.ai/code/session_01FRmSBruVWCufm3LsUVMs8v		2026-04-16 16:47:07 +00:00
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goldens	codegen: skip parameter-spill prologue for leaf functions	2026-04-16 16:47:07 +00:00
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