In C restrict says in this function assume pointers don't alias. Which may or may not be true. This gives the library author a hard choice to make: limit usefu

In C restrict says in this function assume pointers don't alias. Which may or may not be true. This gives the library author a hard choice to make: limit usefulness or performance. Fortran for the longest time(introduced in 90) didn't have pointers so there was no aliasing possible. With pointers in Fortran you have to specify what they may alias so the problem is much easier.(note: I have read about it but never actually worked in Fortran so I may be wrong.)