controlled compile-time specialization

[Andreas Schwab]

On Dez 14 2025, Martin Uecker via Gcc wrote:

> One could use templates in C++ or macros, but then this is
> rather heavy weight and also rigid as one has to structure the
> code around it.   I am rather looking for some lightweight 
> solution such as annotation I could put on the argument or variable
> that says: If this is value is known to be a compile-time
> constant, please create a specialized code path when optimizing.
> (maybe with some limit on recursion), maybe only for specified
> parameter ranges.
>
> Or are there other better ways to do this already?

Is __builtin_constant_p what you are looking for?

-- 
Andreas Schwab, schwab@linux-m68k.org
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