D mentioned on Rust discussions site

[NaN]

On Saturday, 23 May 2020 at 02:37:23 UTC, Walter Bright wrote:
> On 5/22/2020 2:22 AM, Henrik wrote:
>> do you find the ideas of the restrict keyword and VLA bad, or 
>> only the current implementation in C99?
>
> I've done some experiments with restrict in gcc, examined the 
> generated code, and found the optimizations it does and does 
> not do baffling. I wonder if perhaps it is used so little that 
> nobody really bothered to get the semantics right.

There's a video on YouTube Chandler Caruth about how LLVM 
optimises C++, one of the interesting points he made was that 
const is literately zero help to the compiler for optimisation.

He also said that inlining is the single most important 
optimisation.