Hi!

On Sun, Oct 9, 2016 at 5:39 PM, Wouter van Ooijen <wouter@voti.nl> wrote:
> Op 09-Oct-16 om 7:50 PM schreef smplx:
>> The piclist seems very quite regarding PIC topics lately so I thought I'=
d
>> try to add something interesting.
>>
>> Before we get bogged down into which is better assembler or high level
>> language consider how you would feel about a compiler that generates cod=
e
>> that is optimised beyond your wildest dreams.
>>
>> Imagin that you don't need to resort to sneaky tricks or hand crafted
>> assembler embedded in your high level code. That you don't need to
>> labouriously generate complicated tables in excel or matlab and then
>> painstakingly shoehorn them into you high level code. Imagin that you ca=
n
>> execute thousands of lines of complex code and have the result available
>> in the time it takes to execute a single machine cycle. And better still=
,
>> imagin you can do all this without having to learn some new complicated
>> language.
>>
>> Basically it comes down to this: the compiler executes as much user code
>> as possible during the compilation process and works out the bare minimu=
m
>> that needs to be executed in the target.
>
> Are you aware that this is a feature of C++? It was available for a long
> time in a rather convoluted form as meta-programming (templates and
> SFINAE), extended to plain functions in a limited form in C++ 11
> (single-return-statement functions only), which was generalized in C++ 14=
..
>
> I don't fully get what you proposed, but in C++ you can use
>
> constexpr auto x =3D y( ... );
>
> which requires that y(...) is evaluated at compile time. Y can be a
> function, or an object constructor that creates a complex object.
>

For a good example of what current C++ compilers can do at
compile time, you can see the following video:

   https://www.youtube.com/watch?v=3DzBkNBP00wJE

It's a talk about C64 pong game written in C++.

    Daniel.
--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.