signet::forge::xxhash::detail Namespace Reference

Implementation details – not part of the public API. More...

Functions
constexpr uint64_t	rotl64 (uint64_t v, int r)
	Rotate v left by r bits (circular shift).
uint64_t	read_u64_le (const uint8_t *p)
	Read a little-endian uint64_t from potentially unaligned memory.
uint32_t	read_u32_le (const uint8_t *p)
	Read a little-endian uint32_t from potentially unaligned memory.
constexpr uint64_t	round (uint64_t acc, uint64_t lane)
	Round function: accumulate one 8-byte lane into an accumulator.
constexpr uint64_t	merge_accumulator (uint64_t acc, uint64_t v)
	Merge an accumulator value into the converged accumulator.
constexpr uint64_t	avalanche (uint64_t h)
	Avalanche / finalization mix to ensure all output bits are well-distributed.

Detailed Description

Implementation details – not part of the public API.

Function Documentation

avalanche()

constexpr uint64_t signet::forge::xxhash::detail::avalanche ( uint64_t  h )

inlineconstexpr

Avalanche / finalization mix to ensure all output bits are well-distributed.

Applies three rounds of xor-shift-multiply to diffuse entropy.

Parameters

h	Raw hash accumulator before finalization.

Returns

Finalized 64-bit hash value.

Definition at line 133 of file xxhash.hpp.

merge_accumulator()

constexpr uint64_t signet::forge::xxhash::detail::merge_accumulator ( uint64_t  acc, uint64_t  v  )

inlineconstexpr

Merge an accumulator value into the converged accumulator.

Computes: acc = (acc ^ round(0, v)) * PRIME1 + PRIME4

Parameters

acc	Converged accumulator (from the 4-lane rotation sum).
v	One of the four lane accumulators to merge.

Returns

Updated converged accumulator.

Definition at line 121 of file xxhash.hpp.

read_u32_le()

uint32_t signet::forge::xxhash::detail::read_u32_le ( const uint8_t *  p )

inline

Read a little-endian uint32_t from potentially unaligned memory.

Parameters

p	Pointer to 4 bytes of data in little-endian byte order.

Returns

The decoded 32-bit value in host byte order.

Note

On big-endian platforms, a byte swap is applied automatically.

Definition at line 82 of file xxhash.hpp.

read_u64_le()

uint64_t signet::forge::xxhash::detail::read_u64_le ( const uint8_t *  p )

inline

Read a little-endian uint64_t from potentially unaligned memory.

Parameters

p	Pointer to 8 bytes of data in little-endian byte order.

Returns

The decoded 64-bit value in host byte order.

Note

On big-endian platforms, a byte swap is applied automatically.

Definition at line 61 of file xxhash.hpp.

rotl64()

constexpr uint64_t signet::forge::xxhash::detail::rotl64 ( uint64_t  v, int  r  )

inlineconstexpr

Rotate v left by r bits (circular shift).

Parameters

v	64-bit value to rotate.
r	Number of bit positions to rotate (0-63).

Returns

Rotated value.

Definition at line 52 of file xxhash.hpp.

round()

constexpr uint64_t signet::forge::xxhash::detail::round ( uint64_t  acc, uint64_t  lane  )

inlineconstexpr

Round function: accumulate one 8-byte lane into an accumulator.

Computes: acc = rotl(acc + lane * PRIME2, 31) * PRIME1

Parameters

acc	Current accumulator value.
lane	64-bit data lane to fold in.

Returns

Updated accumulator.

Definition at line 107 of file xxhash.hpp.