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

[via Digitalmars-d-learn]

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