Visible to Intel only — GUID: GUID-4D8408E2-D3B5-4AA5-9727-26EE46A9DEC1
Visible to Intel only — GUID: GUID-4D8408E2-D3B5-4AA5-9727-26EE46A9DEC1
LOOP COUNT
General Compiler Directive: Specifies the iterations (typical trip count) for a DO loop.
!DIR$ LOOP COUNT (n1[, n2]...)
!DIR$ LOOP COUNT= n1[, n2]...
!DIR$ LOOP COUNT qualifier(n)[, qualifier(n)]...
!DIR$ LOOP COUNT qualifier=n[, qualifier=n]...
n1, n2 |
Is a non-negative integer constant. It indicates that the next DO loop will iterate n1, n2, or some other number of times. |
qualifier |
Is one or more of the following:
|
The value of the loop count affects heuristics used in software pipelining, vectorization, and loop-transformations.
There is no check at runtime to determine if the MAX or MIN values are exceeded.
Example
Consider the following:
!DIR$ LOOP COUNT (10000)
do i =1,m
b(i) = a(i) +1 ! This is likely to enable the loop to get software-pipelined
enddo
Note that you can specify more than one LOOP COUNT directive for a DO loop. For example, the following directives are valid:
!DIR$ LOOP COUNT (10, 20, 30)
!DIR$ LOOP COUNT MAX=100, MIN=3, AVG=17
DO
...