Intel® Fortran Compiler 17.0 Developer Guide and Reference
Add "%s" to the declaration of routine "%s" in order to parallelize the loop at line %d. Adding "%s" achieves a similar effect.
Confirm that the routine specified is indeed an elemental function or an ATTRIBUTES CONCURRENCY_SAFE function before following the advice to add the annotation.
If the routine is not one of these kinds of functions, try to inline it with a FORCEINLINE RECURSIVE directive. This action may or may not be beneficial.
Consider the following:
subroutine foo ()
integer, parameter :: N2 = 10000
real (8) :: A(N2), B(N2)
interface
function bar (k)
integer :: bar, k
end function bar
end interface
integer :: i
do i =1, N2
A(i) = B(i) * bar(N2)
end do
end subroutine fooIn this case, to parallelize the loop at line 11, declare the routine bar as elemental.
If you determine it is safe to do so, an alternative way you can modify the program code is as follows:
subroutine foo ()
integer, parameter :: N2 = 10000
real (8) :: A(N2), B(N2)
interface
function bar (k)
!dir$ attributes concurrency_safe : profitable
integer :: bar, k
end function bar
end interface
integer :: i
do i =1, N2
A(i) = B(i) * bar(N2)
end do
end subroutine fooConfirm that the routine satisfies the semantics of this declaration. Another way to help the loop being parallelized is to inline the routine with the FORCEINLINE RECURSIVE directive, but this method does not guarantee parallelization.