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"evidence/M2Pro/sanity.txt", "pair": "1000 seeds pass registered-prefix and full-24-byte equality, exactly 8 output bytes, identical 9000-word expanded keys to fixed adapter", "pair_raw_file": "evidence/M2Pro/pair.txt" } } }, "flags": [], "reference_controls": { "M2Pro": { "chainhash-256": { "bulk_bytes_per_cycle": 22.8, "small_cycles_per_hash": 70.49, "source": "../m2-rerun/speeds_m2_v2_final.json" }, "XXH3-64": { "bulk_bytes_per_cycle": 13.16, "small_cycles_per_hash": 24.51, "source": "../m2-rerun/speeds_m2_v2_final.json" }, "HalftimeHash-512": { "bulk_bytes_per_cycle": 7.46, "small_cycles_per_hash": 63.18, "source": "speeds_halftime_fixed.json" }, "HalftimeHash24-fixed": { "bulk_bytes_per_cycle": 5.55, "small_cycles_per_hash": 48.63, "source": "speeds_halftime_fixed.json" } }, "Xeon8375C": { "chainhash-256": { "bulk_bytes_per_cycle": 14.42, "small_cycles_per_hash": 103.9, "source": "../speedbench/speeds.json" }, "XXH3-64": { "bulk_bytes_per_cycle": 19.69, "small_cycles_per_hash": 30.16, "source": "../speedbench/speeds.json" }, "HalftimeHash-512": { "bulk_bytes_per_cycle": 19.19, "small_cycles_per_hash": 84.53, "source": "speeds_halftime_fixed.json" }, "HalftimeHash24-fixed": { "bulk_bytes_per_cycle": 14.12, "small_cycles_per_hash": 79.42, "source": "speeds_halftime_fixed.json" } } }, "shipped_header_sha256": "7ef5dd48f54537b430f85bc1867b23a93551ab1c56415cfcef362d1651956cc3", "fixed_header_sha256": "77d30baf4c6dc12e270236400e5323ccd4ef7a17e0aac877b3cbe4bc325ecbad", "api_bindings": { "HalftimeHash24-shipped": "unmodified advanced::V4<3>; first 8 bytes copied to SMHasher3; full value is 24 bytes", "HalftimeHash24-fixed": "existing repaired advanced::V4<3>; all 24 bytes copied, unchanged registration", "HalftimeHash-512": "existing SMHasher3 64-bit Style wrapper port" }, "collision_score": { "name": "HalftimeHash24-shipped", "bits": 0, "scope": "full 24-byte advanced value, not merely 64-bit projection", "witness": "empty string versus one zero byte; equal for every key; tail zero-pads without encoding length" }, "key_expansion": "Exact fixed registration adapter: four SplitMix64 initial words, Romu-style w/x/y/z generator, 10 discarded rounds, 9000 uint64 words in aligned thread_local storage; excluded from hash timing by SMHasher3 seedfn.", "chart_points": [ { "host": "Xeon8375C", "name": "HalftimeHash24-shipped", "bulk_bytes_per_cycle": 12.81, "collision_score_bits": 0, "full_value_bits": 192, "smhasher_output_bits": 64, "backend_token": "avx512f" }, { "host": "M2Pro", "name": "HalftimeHash24-shipped", "bulk_bytes_per_cycle": 1.37, "collision_score_bits": 0, "full_value_bits": 192, "smhasher_output_bits": 64, "backend_token": "scalar" } ] }