On Wed, Feb 19, 2025 at 09:31:50AM +0000, Chiranmoy.Bhattacharya@fujitsu.com wrote:
>> Hm. Any idea why that is? I wonder if the compiler isn't using as many
>> SVE registers as it could for this.
>
> Not sure, we tried forcing loop unrolling using the below line in the MakeFile
> but the results are the same.
>
> pg_popcount_sve.o: CFLAGS += ${CFLAGS_UNROLL_LOOPS} -march=native
Interesting. I do see different assembly with the 2 and 4 register
versions, but I didn't get to testing it on a machine with SVE support
today.
Besides some additional benchmarking, I might make some small adjustments
to the patch. But overall, it seems to be in decent shape.
--
nathan
