On Tue, Jun 16, 2026 at 02:55:52PM +1000, Gavin Shan wrote: > On 6/16/26 2:49 PM, Michael S. Tsirkin wrote: > > On Mon, Jun 15, 2026 at 09:48:00PM -0700, Richard Henderson wrote: > > > On 6/15/26 21:23, Michael S. Tsirkin wrote: > > > > B. Also on x86, I do not see why we should not use memcpy for large > > > > accesses if we can. Better perf. > > > > > > We have an example where memcpy writes to the same location 3 times. > > > This is not appropriate for any host. > > > > > > > > > r~ > > > > as in, same byte? could you share the details pls? > > > > This issue happened on aarch64 only. > > https://lore.kernel.org/qemu-devel/cafeaca8dwhv8f48kb-013rxkg9kkczhym9_qarkmoeufeh0...@mail.gmail.com/ > > Thanks, > Gavin
oh wow. thanks for sharing! Still I think for sizes outside of 2,4,8 it's fine? That is where the perf is. -- MST
