On 16/07/2021 12:17, Jonathan Wakely via Gcc-patches wrote:
On Fri, 16 Jul 2021 at 03:51, Noah Goldstein wrote:
On intel x86 systems with a private L2 cache the spatial prefetcher
can cause destructive interference along 128 byte aligned boundaries.
https://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-optimization-manual.pdf#page=60
Which is a good example of why these "constants" should never have
been standardized in the first place. Sigh.
+1 for that.
I'll have a chat with our architecture guys, but I've no idea if they'll
commit to any (useful) values for either constant.
R.
