Will using Vectorization speed up the program?

[PierU]

@xsong

Thank you for your reply. Yes, I do feel a little confused about vectorization. According to what you said, if I use a compiled language like Fortran, generally speaking, there is no need to deliberately vectorize the code use array syntax, because the Fortran compiler usually performs optimizations by itself.

Mostly yes. Just, one can help the compilers exploiting the vector capabilities of the code by writing appropriate code. And array syntax can be one way.

@xsong

But appropriate operations can be performed to improve code readability, such as in my example, operating on the inner loop.

Yes. The appropriate amount of array syntax can be determined for the following rule of thumb (that I like a lot): “If you have to think more than 10 seconds about how to express your calculations with array syntax, then you’d probably better write a loop instead”.