D outperformed by C++, what am I doing wrong?

[via Digitalmars-d-learn]

On Sunday, 13 August 2017 at 08:29:30 UTC, Petar Kirov 
[ZombineDev] wrote:
> On Sunday, 13 August 2017 at 08:13:56 UTC, amfvcg wrote:
>> On Sunday, 13 August 2017 at 08:00:53 UTC, Daniel Kozak wrote:
>>> my second version on ldc takes 380ms and c++ version on same 
>>> compiler (clang), takes 350ms, so it seems to be almost same
>>>
>>
>> Ok, on ideone (ldc 1.1.0) it timeouts, on dpaste (ldc 0.12.0) 
>> it gets killed.
>> What version are you using?
>>
>> Either way, if that'd be the case - that's slick. (and ldc 
>> would be the compiler of choice for real use cases).
>
> Here are my results:
>
> $ uname -sri
> Linux 4.10.0-28-generic x86_64
>
> $ lscpu | grep 'Model name'
> Model name:            Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz
>
> $ ldc2 --version | head -n5
> LDC - the LLVM D compiler (1.3.0):
>   based on DMD v2.073.2 and LLVM 4.0.0
>   built with LDC - the LLVM D compiler (1.3.0)
>   Default target: x86_64-unknown-linux-gnu
>   Host CPU: ivybridge
>
> $ g++ --version | head -n1
> g++ (Ubuntu 6.3.0-12ubuntu2) 6.3.0 20170406
>
> $ ldc2 -O3 --release sum_subranges.d
> $ ./sum_subranges
> 378 ms, 556 μs, and 9 hnsecs
> 50000000
>
> $ g++ -O5 sum_subranges.cpp -o sum_subranges
> $ ./sum_subranges
> 237135
> 50000000

With Daniel's latest version (
http://forum.dlang.org/post/mailman.5963.1502612885.31550.digitalmars-d-learn@puremagic.com )

$ ldc2 -O3 --release sum_subranges2.d
$ ./sum_subranges2
210 ms, 838 μs, and 8 hnsecs
50000000