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Measured on AVX-512 hardware, the x8 C code uses at most 2736 bytes of stack across all SP alignments, independent of input length. A 4096-byte frame leaves ~1.3KB headroom and avoids needless morestack calls. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Fixes the stack pointer alignment when using the SIMD path.