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Claude 30151295ad perf: make uLt() platform-specific to avoid JVM regression

The inline uLt() using XOR trick in commonMain regressed JVM by ~30%
because HotSpot's Long.compareUnsigned is a JIT intrinsic (single
unsigned CMP + SETB), while the XOR trick generates 2 extra XOR insns
that HotSpot doesn't optimize away.

Convert uLt to expect/actual:
- JVM: Long.compareUnsigned (HotSpot intrinsic)
- Android: XOR trick (avoids ULong.constructor-impl NOOP calls)
- Native: XOR trick (no JVM intrinsics available)

JVM verify: 2.1x → 1.5x (restored, slightly better than 1.6x baseline)
Android: unchanged (still uses XOR trick)

https://claude.ai/code/session_01EMY5RnXb9rnsyU2KbXrSaY

2026-04-09 01:29:20 +00:00

.idea

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2026-03-06 10:58:59 -05:00

src

perf: make uLt() platform-specific to avoid JVM regression

2026-04-09 01:29:20 +00:00

.gitignore

…

build.gradle.kts

v1.08.0

2026-04-01 15:45:46 -04:00