Re: vectorized CRC on ARM64

On Fri, Apr 03, 2026 at 03:22:59PM +0700, John Naylor wrote:
> I went with the following for v5, and it passes MacOS on my Github CI:
> 
> +  /* set fallbacks */
> +#ifdef USE_ARMV8_CRC32C
> +  /* On e.g. MacOS, our runtime feature detection doesn't work */
> +  pg_comp_crc32c = pg_comp_crc32c_armv8;
> +#else
> +  pg_comp_crc32c = pg_comp_crc32c_sb8;
> +#endif
> + [...crc and pmull checks]
> 
> That should keep scalar hardware support working, but now it'll only
> use direct calls for constant inputs.

v5 LGTM

-- 
nathan