comments about potential inds⊸⊏˘bitmat optimizations
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// Boolean indices:
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// Short inds and short cells: Widen to i8
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// Otherwise: bitsel call per cell
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// SHOULD specialize wider input/output:
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// AVX2 extract 16 bits from 128: vbroadcasti128+vpshufb+vpmullw
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// AVX-512 extract 64 bits from 64: vpmultishiftqb/vpshufbitqmb
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// potentially better options via transposing to allow a shuffle to reorder multiple rows
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// 1, 2, 4 or 8-byte data elements & short cells & short index list:
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// Split indices to available native shuffle width (e.g. 2‿1⊸⊏˘ n‿5⥊i16 → 2‿3‿0‿1⊸⊏˘ n‿10⥊i8)
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// Repeat indices if using ≤0.5x of shuffle width (e.g. 0‿0‿2⊸⊏˘ n‿3⥊i8 → 0‿0‿2‿3‿3‿5⊸⊏˘ n‿6⥊i8)
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