further update slash.c implementation comments
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// In the notes 𝕨 might indicate 𝕩 for Indices too
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// Boolean 𝕨 (Where/Compress) general case based on result type width
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// Size 1: pext, or bit-at-a-time
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// Emulate pext if unavailable
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// Size 1: pext
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// Emulate if unavailable
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// COULD return boolean result from Where
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// Size 8, 16, 32, 64: mostly table-based
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// Where: direct table lookup, widening for 16 and 32 if available
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