Andrew Tridgell aa142f08ef fix uninitialized mul_one in AVX2 checksum and add SIMD checksum test ...

The AVX2 get_checksum1_avx2_64() read mul_one before initializing it,
which is undefined behavior. Replace the cmpeq/abs trick with
_mm256_set1_epi8(1) to match the SSSE3 and SSE2 versions.

Add a TEST_SIMD_CHECKSUM1 test mode that verifies all SIMD paths
(SSE2, SSSE3, AVX2, and the full dispatch chain) produce identical
results to the C reference, across multiple buffer sizes with both
aligned and unaligned buffers.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-02 09:52:01 +11:00

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