How to use Vector Extensions in an opBinary

[user1234]

On Sunday, 17 April 2022 at 11:16:25 UTC, HuskyNator wrote:
> I recently found out there is [support for vector 
> extensions](https://dlang.org/spec/simd.html)
> But I have found I don't really understand how to use it, not 
> even mentioning the more complex stuff. I couldn't find any 
> good examples either.
>
> I'm trying to figure out how to implement the following 
> opBinary using vector extensions.
> ```dlang
> alias MatType = typeof(this);
>
> union{
>   T[rows*columns] vec;
>   T[rows][columns] mat;
> }
>
> MatType opBinary(string op, T)(const T right) const {
>   MatType result = this;
>   mixin("result.vec[] = this.vec[] " ~ op ~ " right;");
>   return result;
> }
> ```
> Or alternatively, as I'm not sure which is more 
> efficient/faster:
> ```dlang
> MatType opBinary(string op, T)(const T right) const {
>   MatType result;
>   static foreach(i; 0..rows*columns)
>     mixin("result.vec[i] = this.vec[i] " ~ op ~ " right;");
>   return result;
> }
> ```
>
> But going off the documentation, I have no idea how to use 
> vector extensions to achieve something like this.
>
> As a small disclaimer; I don't know to what extent the compiler 
> already automates these kind of operations, and mostly want to 
> use this as a learning experience.
>
> Kind regards, HN

I'd experiment with CompilerExplorer. For example 
[this](https://godbolt.org/z/a51r8GEv4) shows that the codegen is 
identical for both opBinary version for "+".

About time spent to compile, `static foreach` is known not to 
scale well.