[feature-request] make vector intrinsics constexpr #30794
Description
| Bugzilla Link | 31446 |
| Version | trunk |
| OS | All |
| Depends On | #20531 #41806 |
| CC | @Bigcheese,@topperc,@erichkeane,@filcab,@RKSimon,@zygoloid,@rotateright |
Extended Description
Linear algebra libraries like Eigen3 explicitly vectorize their code. However, because vector intrinsics (SSE, AVX,...) are not constexpr, it is impossible for them to provide an interface that can easily be used both at compile-time and run-time.
Duplicating all their code for running at compile-time is not an option.
A first step towards allowing these libraries to be usable within constant expressions would be to make the vector intrinsics constexpr and allowing their evaluation at compile-time.