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Ran 13 Apr 2026 08:26AM UTC

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Committed 13 Apr 2026 08:26AM UTC coverage: 87.224% (+0.2%) from 87.009%

Job # 24333417795.1

Build Type

push

github

Committed by

MagicalTux

Commit Message

Speed up gost and snefru: 4.5x and 1.8x on 64 KiB throughput

gost (13 → 59 MB/s):
- Fold the GOST 28147-89 S-box substitution with the 11-bit left rotation
  into four precomputed 256-entry uint32 tables per S-box, so each round
  collapses to four byte-indexed lookups OR'd together instead of eight
  variable-shift 4-bit lookups followed by a rotate.
- Rewrite gostPsi as four uint64 shift/or ops, eliminating the 30-byte
  memmove that ran 74 times per compression.
- Inline the 74 psi iterations, the psi(m XOR ...) step, and the h XOR
  into gostShuffle64 so the 256-bit shuffle state stays in registers for
  the whole shuffle.

snefru (25 → 45 MB/s):
- Remove the (i/2)&1 branch in the 16-word inner loop by picking the two
  S-boxes into locals once per round and referring to them directly in the
  unrolled body.
- Unroll the 4-pass byteInWord loop and use bits.RotateLeft32 with a
  literal shift so the compiler emits a ROR instruction per word instead
  of a register-held shift+or.

All existing tests pass.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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347.91 hits per line

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