On 7/22/21 12:02 AM, Dr. David Alan Gilbert wrote:
Hi Richard,
I think you were the last person to fiddle with the prefetching
in buffer_zero_avx2 and friends; Joe (cc'd) wondered if explicit
prefetching still made sense on modern CPUs, and that their hardware
generally figures stuff out better on simple increments.
What was your thinking on this, and did you actually measure
any improvement?
Ah, well, that was 5 years ago so I have no particular memory of this. It wouldn't
surprise me if you can't measure any improvement on modern hardware.
Do you now measure an improvement with the prefetches gone?
r~
