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optimization: migrate SipHashUint256 to PresaltedSipHasher

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Replaces standalone `SipHashUint256` with an `operator()` overload in `PresaltedSipHasher`.
Updates all hasher classes (`SaltedUint256Hasher`, `SaltedTxidHasher`, `SaltedWtxidHasher`) to use `PresaltedSipHasher` internally, enabling the same constant-state caching optimization while keeping behavior unchanged.

Benchmark was also adjusted to cache the salting part.
This commit is contained in:
Lőrinc
2025-09-30 20:58:19 -04:00
parent ec11b9fede
commit 9ca52a4cbe
8 changed files with 45 additions and 55 deletions
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11
src/crypto/siphash.cpp
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@@ -96,16 +96,11 @@ uint64_t CSipHasher::Finalize() const
return v0 ^ v1 ^ v2 ^ v3;
}
uint64_t SipHashUint256(uint64_t k0, uint64_t k1, const uint256& val)
uint64_t PresaltedSipHasher::operator()(const uint256& val) const noexcept
{
/* Specialized implementation for efficiency */
uint64_t v0 = v[0], v1 = v[1], v2 = v[2], v3 = v[3];
uint64_t d = val.GetUint64(0);
// TODO moved in followup commit
uint64_t v0 = CSipHasher::C0 ^ k0;
uint64_t v1 = CSipHasher::C1 ^ k1;
uint64_t v2 = CSipHasher::C2 ^ k0;
uint64_t v3 = CSipHasher::C3 ^ k1 ^ d;
v3 ^= d;
SIPROUND;
SIPROUND;