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Chez Phase 1 close-out: truthy? elision + end-to-end compute bench (jolt-nkcb)

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Elide the redundant jolt-truthy? wrapper on an :if test that provably
yields a Scheme boolean (a native comparison/not, or a boolean const).
Sound because jolt-truthy? of #t/#f is identity. The hot fib/mandelbrot
tests are all comparisons, so this is a direct ceiling lever: fib(30)
end-to-end 24.0 -> 14.4 ms.

Add bench-pipeline.janet (JOLT_CHEZ_BENCH=1, opt-in) timing fib(30) +
mandelbrot(200) through the real pipeline vs the spike ceiling.
Mandelbrot 200 runs at 87 ms, at/below the 98 ms generic-flonum ceiling
- the substrate ceiling is reached end-to-end. fib sits at 2x its
hand-flonum ceiling; the residual is jolt's all-double number model
(typed fl*/fx* emission is Phase 4). Compile-only is total for the
compute subset (every form emits; Chez has no interpreter fallback).

Full parity unchanged at 1534/2494, 0 new divergences.
This commit is contained in:
Yogthos 2026-06-18 09:05:54 -04:00
parent af680ed106
commit e98afcad13
5 changed files with 181 additions and 4 deletions
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10
test/chez/README.md
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@ -196,6 +196,16 @@ class names, eval-order, with-open — all deferred Phase-2 / dynamic-var gaps).
lenient nil-fill was non-Clojure and inconsistent with the seed's own `assoc`. The 4
`assoc! odd args` spec rows became 3 `:throws` + 1 even-args positive; corpus.edn
regenerated. The Chez host already threw, so this only realigns the corpus contract.
- Phase 1 close-out (jolt-nkcb): truthy? elision + end-to-end compute bench. `emit.janet`
now drops the redundant `jolt-truthy?` wrapper on an `:if` test that provably yields a
Scheme boolean (a native comparison/`not`, or a boolean const) — sound because
`jolt-truthy?` of `#t`/`#f` is identity; the hot fib/mandelbrot tests are all
comparisons, so this is a direct ceiling lever (fib 30 end-to-end 24.0 -> 14.4 ms).
`bench-pipeline.janet` (JOLT_CHEZ_BENCH=1, opt-in) times fib(30) + mandelbrot(200)
through the real pipeline vs the spike ceiling: mandelbrot 87 ms runs AT the
generic-flonum ceiling (98 ms); fib is 2x its hand-flonum ceiling, the residual being
jolt's all-double number model (typed fl*/fx* emission = Phase 4). Compile-only is
total for the compute subset (every form emits; Chez has no interpreter fallback).
The remaining buckets are the punch-list the next increments chase: ~361 emit-fail
(genuine host interop — qualified Java/Janet refs, runtime `defmacro`/`eval`, out of