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The fletcher_4_native() and fletcher_4_byteswap() functions may only safely use the vectorized implementations when the buffer is 128-bit aligned. This is because both the AVX2 and SSE implementations process four 32-bit words per iterations. Fallback to the scalar implementation which only processes a single 32-bit word for unaligned buffers. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Gvozden Neskovic <neskovic@gmail.com> Issue #4330