Andrei Alexandrescu needs to read this

[Walter Bright]

On 10/23/2019 4:51 PM, H. S. Teoh wrote:
>> It's also true that code optimizers are tuned to what the local C/C++
>> compiler generates, even if the optimizer is designed to work with
>> multiple diverse languages.
> 
> Interesting, I didn't know this.

It's pretty straightforward why - the optimizer developers tend to be C/C++ 
developers who look at the generated code from their C/C++ compiler.