On Thu, Feb 02, 2023 at 10:21:09PM +0000, David Laight wrote: > From: Andy Shevchenko > > Sent: 02 February 2023 15:18 > > > > Instead of zeroing some memory and then copying data in part or all of it, > > use memcpy_and_pad(). > > This avoids writing some memory twice and should save a few cycles. > > Maybe, maybe not. > It rather depends on the lengths involved (the code doesn't seem to be in the > main tree). > > The cost of the conditionals and the misaligned length/start for the > memset() could easily overwhelm any apparent saving. > > A memset() of a constant whole number of words is going to be significantly > faster than the partial one. Then you can put some (little I suppose) efforts in optimizing memcpy_and_pad() once for all, no? -- With Best Regards, Andy Shevchenko
