Visible to Intel only — GUID: GUID-0E845993-9E85-441C-A6A3-6E4B0D6E6C24
Visible to Intel only — GUID: GUID-0E845993-9E85-441C-A6A3-6E4B0D6E6C24
EXIT Statement
Statement: Terminates execution of a DO loop or a named construct.
EXIT [name]
name |
(Optional) Is the name of the DO loop or construct. |
Description
The EXIT statement causes execution of a DO loop or a named construct to be terminated.
If name is specified, the EXIT statement must be within the range of that named construct. Otherwise, the EXIT statement must be within a DO loop and it exits the innermost DO within which it appears.
If a DO loop is terminated, any inner DO loops are also terminated and the DO control variables retain their last value. If a non-DO construct is terminated, any DO loops inside that construct are also terminated.
An EXIT statement must not appear within a DO CONCURRENT construct if it belongs to that construct or an outer construct.
An EXIT statement must not appear in a CHANGE TEAM or CRITICAL construct if it belongs to an outer construct.
An EXIT statement can appear in any of the following constructs:
ASSOCIATE
BLOCK
CHANGE TEAM
CRITICAL
DO
IF
SELECT CASE
SELECT RANK
SELECT TYPE
An EXIT statement cannot appear in a WHERE or FORALL construct.
Example
The following examples demonstrate EXIT statements.
Example 1:
LOOP_A : DO I = 1, 15
N = N + 1
IF (N > I) EXIT LOOP_A
END DO LOOP_A
Example 2:
INTEGER numpoints, point
REAL datarray(1000), sum
sum = 0.0
DO point = 1, 1000
sum = sum + datarray(point)
IF (datarray(point+1) .EQ. 0.0) EXIT
END DO
Example 3:
DO I=1,N
MyBlock: BLOCK
REAL :: T
T = A(I) + B(I)
IF (T == 0.0) EXIT MyBlock
C(I) = T + SQRT(T)
END BLOCK
END DO
Example 4:
DO CONCURRENT (I = 1:N)
MyBlock: BLOCK
REAL :: T
T = A(I) + B(I)
IF (T == 0.0) EXIT MyBlock
C(I) = T + SQRT(T)
END BLOCK
END DO
The following example shows illegal EXIT statements in DO CONCURRENT and CRITICAL:
LOOP_1 : DO CONCURRENT (I = 1:N)
N = N + 1
IF (N > I) EXIT LOOP_1 ! can’t EXIT DO CONCURRENT
END DO LOOP_1
LOOP_2 : DO I = 1, 15
CRITICAL
N = N + 1
IF (N > I) EXIT LOOP_2 ! can’t EXIT outer construct from inside
END CRITICAL ! CHANGE TEAM, DO CONCURRENT, or CRITICAL
END DO LOOP_2