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Claude ab3a9076e3 perf: eliminate ULong.constructor-impl NOOP calls in unsigned comparisons

Bytecode analysis revealed that every `a.toULong() < b.toULong()`
comparison generates 2 invokestatic calls to ULong.constructor-impl
(NOOPs that return the input unchanged) plus Long.compareUnsigned.
Across all secp256k1 hot paths, this produced 554 NOOP invokestatic
calls in the bytecode, translating to ~18,000 wasted calls per verify.

Replace all toULong() comparisons with an inline uLt() helper that
uses the XOR-with-MIN_VALUE trick directly:

  (a xor Long.MIN_VALUE) < (b xor Long.MIN_VALUE)

This produces pure arithmetic bytecode (lxor, lcmp, ifge) with ZERO
method calls, eliminating all ULong.constructor-impl overhead.

Before: lload, invokestatic ULong.constructor-impl, lload,
        invokestatic ULong.constructor-impl, invokestatic
        Long.compareUnsigned, ifge  (6 bytecodes, 3 method calls)

After:  lload, ldc MIN_VALUE, lxor, lload, ldc MIN_VALUE, lxor,
        lcmp, ifge  (8 bytecodes, 0 method calls)

https://claude.ai/code/session_01EMY5RnXb9rnsyU2KbXrSaY

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

.idea

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src

perf: eliminate ULong.constructor-impl NOOP calls in unsigned comparisons

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

.gitignore

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build.gradle.kts

v1.08.0

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

CLIENT.md