OT (partially): about promotion of integers

[Timon Gehr]

On 12/13/2012 09:09 PM, SomeDude wrote:
> On Wednesday, 12 December 2012 at 20:01:43 UTC, Timon Gehr wrote:
>> On 12/12/2012 03:45 AM, Walter Bright wrote:
>>> On 12/11/2012 5:05 PM, bearophile wrote:
>>>> Walter Bright:
>>>>
>>>>> ML has been around for 30-40 years, and has failed to catch on.
>>>>
>>>> OcaML, Haskell, F#, and so on are all languages derived more or less
>>>> directly
>>>> from ML, that share many of its ideas. Has Haskell caught on? :-)
>>>
>>> Haskell is the language that everyone loves to learn and talk about, and
>>> few actually use.
>>>
>>> And it's significantly slower than D,
>>
>> (Sufficiently sane) languages are not slow or fast and I think the
>> factor GHC/DMD cannot be more than about 2 or 3 for roughly
>> equivalently written imperative code.
>>
>> Furthermore no D implementation has any kind of useful performance for
>> lazy functional style D code.
>>
>> In some ways, D is very significantly slower than Haskell. The
>> compilers optimize specific coding styles better than others.
>>
>>> in unfixable ways.
>>>
>>
>> I disagree. That is certainly fixable. It is a mere QOI issue.
>
> Actually, a factor of 2 to 3 can be huge.

Sure.

> Consider that java is around a
> factor 2 or less to C++ in the Computer Languages Benchmark Game, and
> yet, you easily feel the difference everyday on your desktop applications.

Most software I use is written in C or C++. I think some of it is way 
too slow.

> But although the pure computation power is not very different, the real
> difference I believe lies the memory management, which is probably far
> less efficient in Java than in C++.

It still depends heavily on how well it is done in each case.