forall and arrays

[Ilie__Daniel]

Hello!

I have three arrays of dimension n and same type: a(n), b(n) and c(n). I want to add the a and b and put the result into c.

Could you possibly rank the following implementations from most efficient to least efficient?

1. c = a + b

2. c(1:n) = a(1:n) + b(1:n)

3. forall(i=1:n) c(i) = a(i) + b(i)

Thank you for your input.

Kind regards,
Daniel.

[TimP]

You may require ifort directive !dir$ ivdep to make #3 as effective as the other two.