feat[fastlanes]: add optimized 1024-bit transpose implementations#6135

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joseph-isaacs wants to merge 9 commits intodevelopfrom

claude/bitpacking-transpose-optimization-tM1U4

Commits on Jan 24, 2026

feat[fastlanes]: add optimized 1024-bit transpose implementations
claude
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chore[fastlanes]: add perf measurement examples for transpose
claude
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feat[fastlanes]: add BMI2 PEXT/PDEP transpose and fix GFNI implementations
claude
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feat[fastlanes]: add scalar_fast and ARM64 NEON transpose implementations
claude
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perf[fastlanes]: fully unroll BMI2 transpose for 12% performance gain
claude
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test[fastlanes]: add verification against fastlanes crate transpose
claude
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feat[fastlanes]: add AVX-512 VBMI transpose with 7.5x speedup
claude
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feat[fastlanes]: add dual-block VBMI transpose for 10% more throughput
claude
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feat[fastlanes]: add 4-block VBMI transpose for 7% additional speedup
claude
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