[dzaima]

For my solution (https://github.com/dzaima/1brc, uses jdk.incubator.vector significantly), switching all array reads/writes to identical Unsafe ones results in the solution running ~100x slower, so there's certainly truth to Unsafe messing with optimization - I suppose it means that the VM must consider all live objects to potentially have mutated. (as for the sibling comment, indeed, lack of vpshufb among other things can be felt significantly while attempting to use jdk.incubator.vector)