GCC optimizations are also smart enough to remove memcpy calls for small numbers of bytes entirely and just output the unrolled movs/loads inline. If you're memcpy'ing a struct from a byte buffer and reading some fields, the optimizer is usually smart enough to output the minimum instructions necessary. As I recall, MSVC's optimizations perform similarly.
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GCC optimizations are also smart enough to remove memcpy calls for small numbers of bytes entirely and just output the unrolled movs/loads inline. If you're memcpy'ing a struct from a byte buffer and reading some fields, the optimizer is usually smart enough to output the minimum instructions necessary. As I recall, MSVC's optimizations perform similarly.