On Friday, 6 January 2012 at 21:10:50 UTC, Piotr Szturmaj wrote:
Vladimir Panteleev wrote:
On Monday, 26 December 2011 at 17:37:17 UTC, Piotr Szturmaj
wrote:
Yes. Here are the results: http://pastebin.com/rD8kiaQy. This
is
observed only with Windows DMD.
I'd be more interested in seeing the code.
Sorry for late answer. For memcpy cases code is the same as in
my github Phobos fork. Here is the change to slice copying:
http://pastebin.com/EteqEper
I haven't looked at the disassembly yet, but I'd suggest to
rewrite your code so that the left side of the assignment is a
slice expression beginning with 0. I think DMD will generate
optimal code (memcpy with slightly less overhead than a manual
call) if you make it clear to the compiler that the left-hand
slice and the right-hand slice have the same length.
Also, it looks like the slice version wastes an extra variable
(bw).
