[anonymoushn]

I just read the entire documentation for the rearrange method. My apologies for not reading some unrelated docs to find out what rearrange does. It looks like this just makes things worse though? Like you really do have to mask off the high bits of the input, but then you're also paying several instructions for the mapping of out-of-bounds indices to negative values when making the VectorShuffle and then several instructions again to check whether any of them were negative so you can throw an exception from `rearrange`.