What happens when you remove the #pragma ivdep from the 2nd loop?
What happens when you add #pragma vector always to the 2nd loop?

In the static memory array loop the address of the arrays require no register usage as they can expressed using the Base part of the addressing.

In the dynamic array loop the addresses of the arrays are on the stack requiring an instruction to copy the pointer to the array to a register and if there are sufficient registers available the compiler could move the base address fetch outside the loop. To fully registerize the base of the three arrays in the second loop will require an additional three registers over what the first loop reqires.

An additional matter that could influence performance is the alignment of the arrays. If the static arrays are aligned on a 16 byte address and the dynamic are not. In this case the 2nd the loop (when vectorized) might be performing split loads/stores.

Jim Dempsey