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backend: emit bitwise ops as native ops (test.check PRNG ~2.4x)

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Profiling the test.check distribution/large-sample slowness (jolt-i5if): the
hot path is the SplitMix PRNG, dominated by 64-bit mix arithmetic, and the
bitwise ops (bit-and/or/xor/not, shifts) were NOT in the backend native-ops
table — so (bit-xor a b) compiled to a var-deref through the variadic overlay
(__bit-xor) instead of a direct call, the way +/-/* already emit.

Map bit-and/or/xor/not to the Chez bitwise-and/ior/xor/not primitives (inlined
to native code; a non-integer operand now errors like the JVM instead of being
silently truncated) and the shifts to a direct helper call. bit-and-not stays on
its overlay — its only Scheme impl is 2-arg, so a value-position arity-3 use
would mis-emit.

mix-64 arithmetic 2.7x faster, raw split+rand-long 2.4x, gen/vector ~1.4x. The
remaining gap is the bignum-vs-native-long floor (~20x, substrate) plus the
generator machinery (deftype/fn dispatch, separate). Corpus rows added for value
position, bit-not, apply, and a full-64-bit unsigned shift.
This commit is contained in:
Yogthos 2026-06-28 11:25:52 -04:00
parent b5ea06c5c2
commit f17b68ccfe
4 changed files with 153 additions and 135 deletions
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6
host/chez/seed/prelude.ss
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@ -539,11 +539,11 @@
(guard (e (#t #f))
(def-var! "clojure.core" "to-array-2d" (letrec ((to-array-2d (lambda (coll) (let fnrec4639 ((coll coll)) (jolt-invoke (var-deref "clojure.core" "to-array") (jolt-map (var-deref "clojure.core" "to-array") coll)))))) to-array-2d)))
(guard (e (#t #f))
(def-var! "clojure.core" "unchecked-byte" (letrec ((unchecked-byte (lambda (x) (let fnrec4640 ((x x)) (jolt-invoke (var-deref "clojure.core" "bit-and") (jolt-invoke (var-deref "clojure.core" "int") x) 255))))) unchecked-byte)))
(def-var! "clojure.core" "unchecked-byte" (letrec ((unchecked-byte (lambda (x) (let fnrec4640 ((x x)) (bitwise-and (jolt-invoke (var-deref "clojure.core" "int") x) 255))))) unchecked-byte)))
(guard (e (#t #f))
(def-var! "clojure.core" "unchecked-short" (letrec ((unchecked-short (lambda (x) (let fnrec4641 ((x x)) (jolt-invoke (var-deref "clojure.core" "bit-and") (jolt-invoke (var-deref "clojure.core" "int") x) 65535))))) unchecked-short)))
(def-var! "clojure.core" "unchecked-short" (letrec ((unchecked-short (lambda (x) (let fnrec4641 ((x x)) (bitwise-and (jolt-invoke (var-deref "clojure.core" "int") x) 65535))))) unchecked-short)))
(guard (e (#t #f))
(def-var! "clojure.core" "unchecked-char" (letrec ((unchecked-char (lambda (x) (let fnrec4642 ((x x)) (jolt-invoke (var-deref "clojure.core" "char") (jolt-invoke (var-deref "clojure.core" "bit-and") (jolt-invoke (var-deref "clojure.core" "int") x) 65535)))))) unchecked-char)))
(def-var! "clojure.core" "unchecked-char" (letrec ((unchecked-char (lambda (x) (let fnrec4642 ((x x)) (jolt-invoke (var-deref "clojure.core" "char") (bitwise-and (jolt-invoke (var-deref "clojure.core" "int") x) 65535)))))) unchecked-char)))
(guard (e (#t #f))
(def-var! "clojure.core" "unchecked-float" (letrec ((unchecked-float (lambda (x) (let fnrec4643 ((x x)) (jolt-invoke (var-deref "clojure.core" "double") x))))) unchecked-float)))
(guard (e (#t #f))