P2728: use buffer capacity 64 for the SIMD performance table#238
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64 output code units is the smallest capacity at which the prototype kernel's whole-block paths all fit (a 16-lane block of 3-byte output needs 48 bytes), and for the UTF-8 direction it makes the iterator's buffer exactly one cache line. Update the Wikipedia timing estimates to match the new Latin-row rates. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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64 output code units is the smallest capacity at which the prototype kernel's whole-block paths all fit (a 16-lane block of 3-byte output needs 48 bytes), and for the UTF-8 direction it makes the iterator's buffer exactly one cache line. Update the Wikipedia timing estimates to match the new Latin-row rates.