Don wrote:
Andrei Alexandrescu wrote:
Don wrote:
float[4] would be a greatly superior option if it could be done.
The key requirements are:
(1) need to specify that static arrays are passed by value.
(2) need to keep stack aligned to 16.
The good news is that both of these appear to be done on DMD2-Mac!
I agree with float[4] as a good choice. So are value semantics for
T[n] implemented on the Mac??
Andrei
Oh. I guess it was just a proposal then, and not implemented. We're not
as close as I thought. Bummer.
Yah. Walter agrees that that's the right thing to do. The only thing
that worries us is passing by-value large statically-sized vectors to
template functions. But then gaming code wants to do exactly that. It's
hard to figure where to draw the line. Imagine the error message "Hey,
you're going a bit overboard by passing 512 bytes around on the stack".
Besides, we already do have a solution for pass-by-value vectors:
Tuple!(T[N]). That would put the burden in the right place (on the
programmer actively wanting pass-by-value). But then it's a shame that
the built-in type T[N] is a weird exception that must be handled in all
template code.
No idea what the right choice is. I'm just dumping whatever is buzzing
around my head whenever I think of the issue.
Andrei
