Add unrolled bit-packing kernels for longs (widths 1..63) - #70
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lemire merged 1 commit intoJun 17, 2026
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Branch-free unrolled fastpackwithoutmask/fastunpack for all widths, mirroring the 32-bit BitPacking. Measured on Graviton (aarch64), Corretto 21, median over widths 1..63: pack 1.93x, unpack 2.66x.
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June 17, 2026 07:32
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Unrolled bit-packing kernels for longs
Add unrolled fastpackwithoutmask{1..63} / fastunpack{1..63} to
LongBitPacking, mirroring the 32-bit BitPacking, and extend both
dispatchers to a 0..64 switch.
Performance
BenchmarkLongBitPacking, Graviton (aarch64), Corretto 21. Speedup of the
unrolled kernels over the generic path: