On Tuesday, 8 November 2016 at 12:56:10 UTC, Johan Engelen wrote:
On Monday, 7 November 2016 at 16:48:55 UTC, John Colvin wrote:
[...]
This reminds me of an LLVM presentation by Chandler, mentioning
that passing by reference may hamper the optimization of code
(because memory becomes involved). I don't think he gave a
clear example, but one thing I can think of is potential
aliasing:
void foo(ref LargeThing a, ref LargeThing b), where a and b may
alias partly.
To do the "ref" optimization for _all_ large function
parameters per default sounds like a bad idea.
Also, how would I turn the optimization off (I guess
extern(C++) would do that?)? What if my function needs a local
copy (say, in multithreaded stuff), and I want that copy to be
const?
-Johan
Aliasing is not an issue when LargeThing is immutable, is it ?
