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jolt/host/chez/seed
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Yogthos 7d85b3892f Hint-directed fast arithmetic: loop-carried variable typing (round 2) 
A loop binding whose init is double and whose every recur arg stays double (a
bounded monotone fixpoint) is typed :double, so its arithmetic — and the recur
args feeding it — emit fl-ops. Chez can then keep the accumulator unboxed in a
float register across the loop.

Integer loop vars stay untyped: a bare integer init never seeds :long (same rule
as round 1), so a bignum-producing loop keeps arbitrary precision rather than
overflowing a fixnum. recur-kinds walks only tail position (if/do-ret/let-body),
stopping at nested loop/fn so a loop sees only its own recur.

A/B on a loop-carried double accumulator: 735ms generic -> 500ms typed (1.47x),
closing the gap to the JVM from ~3.3x to ~2.2x. The integer counter stays generic,
which is most of the residual.
2026-06-23 16:49:59 -04:00
..
image.ss Hint-directed fast arithmetic: loop-carried variable typing (round 2) 2026-06-23 16:49:59 -04:00
prelude.ss Split 20-coll.clj into three collection-tier files 2026-06-23 02:06:24 -04:00
README.md Docs: Chez-only, drop the Janet-era references and obsolete migration notes 2026-06-22 09:05:35 -04:00

README.md

Chez bootstrap seed

These two files are the bootstrap compiler for jolt — the seed that makes the build self-hosting:

  • prelude.ss — the clojure.core prelude (all tiers + clojure.string/walk/ template/edn/set/pprint) as Scheme def-var! forms.
  • image.ss — the compiler image (jolt.ir + jolt.analyzer + jolt.backend-scheme) as Scheme def-var! forms.

Both are generated, not hand-written. They are checked in because a fresh checkout must be able to build jolt-on-Chez using only Chez: host/chez/bootstrap.ss loads this seed, then rebuilds the prelude + image from the .clj/.ss sources via the on-Chez compiler (read → analyze → emit, all on Chez). The seed is a joint byte-fixpoint: rebuilding from an up-to-date seed reproduces it exactly. make selfhost (host/chez/selfcheck.sh) runs host/chez/bootstrap.ss and diffs the rebuilt artifacts against the checked-in seed.

Re-minting

When the seed sources change (the core tiers, the compiler namespaces, the host contract, the reader, emit-image.ss), the seed drifts and make selfhost fails. Re-mint it by running host/chez/bootstrap.ss and writing the freshly rebuilt prelude/image back to host/chez/seed/prelude.ss / host/chez/seed/image.ss, then commit the refreshed files.