09-Dec-2014 22:18, Iain Buclaw via Digitalmars-d пишет:
On 9 December 2014 at 19:15, H. S. Teoh via Digitalmars-d
<digitalmars-d@puremagic.com> wrote:
On Tue, Dec 09, 2014 at 10:08:35PM +0300, Dmitry Olshansky via Digitalmars-d
wrote:
09-Dec-2014 20:54, H. S. Teoh via Digitalmars-d пишет:
On Tue, Dec 09, 2014 at 07:16:56PM +0300, Dmitry Olshansky via Digitalmars-d
wrote:
08-Dec-2014 18:18, H. S. Teoh via Digitalmars-d пишет:
[...]
Yeah, I find in my own experience that gdc -O3 tends to produce
code that's consistently ~20% faster than dmd -O, especially in
compute-intensive code.
And that's not nearly enough. Also both LDC & GDC often can't inline
many functions from phobos due to separate compilation.
[...]
Really? Most of the Phobos function I use are templates, so inlining
shouldn't be a problem, should it? Besides, gdc is far better at
inlining that dmd ever was, though of course there are some
constructs that the front-end doesn't inline, and the backend doesn't
have enough info to do so. This is an area that should be improved.
std.ascii.isWhite ... and there are plenty of things our templates
inevitably unfold to. I mean come on phobos library is big pile of
object code, it can't be all templates.
Last time I checked if you copy-paste isWhite it to your source code
it gets much faster then std one because of inlining.
[...]
Hmm. Would it help to change isWhite into a template function?
That can't be the answer for everything.
As someone (ab)using empty template "idiom", I agree, we need a better
solution.
--
Dmitry Olshansky
