ARMv7 vs x86-64: Pathfinding benchmark of C++, D, Go, Nim, Ocaml, and more.

[Iain Buclaw via Digitalmars-d]

On 22 December 2014 at 11:45, logicchains via Digitalmars-d
<digitalmars-d at puremagic.com> wrote:
> On Sunday, 21 December 2014 at 09:48:24 UTC, Dicebot wrote:
>>
>> On Saturday, 20 December 2014 at 21:47:24 UTC, Walter Bright wrote:
>>>
>>> I did notice this:
>>>
>>> "I updated the ldc D compiler earlier today (incidentally, as part of
>>> upgrading my system with pacman -Syu), and now it doesn't compile at all. It
>>> was previously compiling, and ran at around 90% the speed of C++ on ARM."
>>>
>>> Sigh.
>>
>>
>> I have deployed experimental LDC package exactly to be able to detect such
>> issues, otherwise it will never get there. It will be either fixed within a
>> week or reverted to old mode.
>
>
> I installed the new Arch Linux LDC package but it still fails with the same
> error: /usr/lib/libldruntime.so: undefined reference to `__mulodi4'
>
> I did get GDC to work on ARM, but for some reason the resulting executable
> is horribly slow, around five times slower than what LDC produced. Are there
> any flags other than -O3 that I should be using?

Other than -frelease (to turn off most non-release code generation), no.

Can you get a profiler on it to see where it's spending most of it's time?

Thanks
Iain.