Form of Parallelization Directive Lines

Parallel directives have the following syntax.

!MIC$ DOALL [general parameters] [scheduling parameter]

A parallelization directive line is defined as follows.

• A parallel directive starts with the CMIC$ or !MIC$, followed by:

  • A space

  • A directive

  • For some directives, one or more parameters

• Spaces before, after, or within a directive are ignored.

• Letters of a parallelization directive line can be in uppercase, lowercase, or mixed.

The form varies for fixed-form and free-form source as follows.

Fixed

• Put CMIC$ or !MIC$ in columns 1 through 5.

• Directives are listed in columns 7 and beyond.

• Columns beyond 72 are ignored.

• An initial directive line has a blank in column 6.

• A continuation directive line has a nonblank in column 6.

Free

• Put !MIC$ followed by a space anywhere in the line. The !MIC$ characters are the first nonblank characters in the line (actually, non-whitespace).

• Directives are listed after the space.

• An initial directive line has a blank, tab, or newline in the position immediately after the !MIC$.

• A continuation directive line has a character other than a blank, tab, or newline in the position immediately after the !MIC$.

Thus, !MIC$ in columns 1 through 5 works for both free and fixed.

Example: Directive with continuation lines (DOALL directive and parameters.)

C$PAR DOALL
!MIC$&   SHARED( a, b, c, n )
!MIC$&   PRIVATE( i )
	DO i = 1, n
		a(i) = b(i) * c(i)
	END DO

Example: Same directive and parameters, with no continuation lines.

C$PAR DOALL  SHARED( a, b, c, n )  PRIVATE( i )
	DO i = 1, n
		a(i) = b(i) * c(i)
	END DO