http://www.reddit.com/r/programming/comments/2aruaf/dconf_2014_keynote_high_performance_code_using_d/

https://www.facebook.com/dlang.org/posts/885322668148082

https://twitter.com/D_Programming/status/489081312297635840


Andrei

On Tuesday, 15 July 2014 at 16:20:34 UTC, Andrei Alexandrescu wrote:
> http://www.reddit.com/r/programming/comments/2aruaf/dconf_2014_keynote_high_performance_code_using_d/
>
> https://www.facebook.com/dlang.org/posts/885322668148082
>
> https://twitter.com/D_Programming/status/489081312297635840
>
>
> Andrei


Thanks for posting these videos.

At the end of this video, it sounds like it ends abruptly..
While answering a question, Walter says.. 'it turns out..' and the video ends there.

On 7/15/2014 11:28 AM, John wrote:
> At the end of this video, it sounds like it ends abruptly..
> While answering a question, Walter says.. 'it turns out..' and the video ends
> there.

That's when my time ran out and I vanished in a puff of greasy black smoke.

On Tue, 15 Jul 2014 18:28:34 +0000, John wrote:

> On Tuesday, 15 July 2014 at 16:20:34 UTC, Andrei Alexandrescu wrote:
>> http://www.reddit.com/r/programming/comments/2aruaf/
dconf_2014_keynote_high_performance_code_using_d/
>>
>> https://www.facebook.com/dlang.org/posts/885322668148082
>>
>> https://twitter.com/D_Programming/status/489081312297635840
>>
>>
>> Andrei
> 
> 
> Thanks for posting these videos.
> 
> At the end of this video, it sounds like it ends abruptly.. While answering a question, Walter says.. 'it turns out..' and the video ends there.

The sentence was "it turns out the simple compiler enhancement I am about to reveal makes all code run 5x faster."

On Tuesday, 15 July 2014 at 16:20:34 UTC, Andrei Alexandrescu wrote:
> http://www.reddit.com/r/programming/comments/2aruaf/dconf_2014_keynote_high_performance_code_using_d/
>
> https://www.facebook.com/dlang.org/posts/885322668148082
>
> https://twitter.com/D_Programming/status/489081312297635840

Will there be a lower-res video of this talk than 1.3 GBs, as there was for other talks?

On 7/15/2014 12:36 PM, Justin Whear wrote:
> The sentence was "it turns out the simple compiler enhancement I am about
> to reveal makes all code run 5x faster."

That does it. You're on the hook for writing my next material!

On Tuesday, 15 July 2014 at 16:20:34 UTC, Andrei Alexandrescu wrote:
> http://www.reddit.com/r/programming/comments/2aruaf/dconf_2014_keynote_high_performance_code_using_d/
>
> https://www.facebook.com/dlang.org/posts/885322668148082
>
> https://twitter.com/D_Programming/status/489081312297635840
>
>
> Andrei

Is the presentation itself available somewhere?

Andrei Alexandrescu:
> http://www.reddit.com/r/programming/comments/2aruaf/dconf_2014_keynote_high_performance_code_using_d/

Despite Walter is used to "pipeline programming", so the next step is to also handle failures and off-band messages in a functional way (without exceptions and global error values) with two "parallel pipelines", here named "Railway-Oriented Programming". This is one of the simplest introductions (and he can skip the slides 19-53) that I have found of this topic (that in the Haskell community is explained on the base of monads):

http://www.slideshare.net/ScottWlaschin/railway-oriented-programming

In Bugzilla there are already requests for some Railway-Oriented Programming:

https://issues.dlang.org/show_bug.cgi?id=6840
https://issues.dlang.org/show_bug.cgi?id=6843

I think no language extensions are needed for such kind of programming, but of course built-in tuple syntax and basic forms of pattern matching in switch (https://d.puremagic.com/issues/show_bug.cgi?id=596 ) improve the syntax and make the code more handy, handy enough to push more D programmers in using it.

For some examples of those things in a system language, this page shows some little examples of functional syntax for Rust:
http://science.raphael.poss.name/rust-for-functional-programmers.html

Bye,
bearophile

> Despite Walter is

Sorry, I meant to write, "Now Walter is"...

Bye,
bearophile

Am 15.07.2014 18:20, schrieb Andrei Alexandrescu:
> http://www.reddit.com/r/programming/comments/2aruaf/dconf_2014_keynote_high_performance_code_using_d/
>
> https://www.facebook.com/dlang.org/posts/885322668148082
>
> https://twitter.com/D_Programming/status/489081312297635840
>
>
> Andrei
>

@Walter

can you give an short (working) example code to show the different resulting assembler for your for-rewrite example - and what compilers your using for testing - only dmd or gdc?

this example:

T[10] array
for(int i = 0; i < 10; ++i) foo(array[i])

i've tested some combination on
http://gcc.godbolt.org/ with clang 3.4.1 and gcc4.9x

and i can't see any difference