Files
scylladb/cql3/functions
Szymon Malewski d817e56e87 vector_similarity_fcts.cc: fix strict aliasing violation in extract_float_vector
Previous code performed endian conversion by bulk-copying raw bytes
into a std::vector<float> and then iterating over it via a
reinterpret_cast<uint32_t*> pointer. Accessing float storage through a
uint32_t* violates C++ strict aliasing rules, giving the compiler
freedom to reorder or elide the stores, causing undefined behavior.

Replace the two-pass approach with a single-pass loop using
seastar::consume_be<uint32_t>() and std::bit_cast<float>(), which is
both well-defined and auto-vectorizable.

Follow-up #28754

Closes scylladb/scylladb#28912
2026-03-06 09:15:45 +01:00
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