Re: [PATCH] Hex-coding optimizations using SVE on ARM.

On Tue, Jan 14, 2025 at 12:59:04AM -0500, Tom Lane wrote:
> John Naylor <johncnaylorls@gmail.com> writes:
>> We can do about as well simply by changing the nibble lookup to a byte
>> lookup, which works on every compiler and architecture:

Nice.  I tried enabling auto-vectorization and loop unrolling on top of
this patch, and the numbers looked the same.  I think we'd need CPU
intrinsics or an even bigger lookup table to do any better.

> I didn't attempt to verify your patch, but I do prefer addressing
> this issue in a machine-independent fashion.  I also like the brevity
> of the patch (though it could do with some comments perhaps, not that
> the existing code has any).

+1

-- 
nathan