GCC is just vectorizing the code literally. It's doing multiple bytes in each loop iteration, but the vectorized code is still bit-testing the index to conditio

GCC is just vectorizing the code literally. It's doing multiple bytes in each loop iteration, but the vectorized code is still bit-testing the index to conditionally XOR into each accumulator. This is still much less efficient than taking advantage of the regular patterns as in the latter parts of the article. It also runs with a lot less lanes than it could, because it uses 32-bit lanes instead of 8-bit for some reason.