Fortran Directives Summary
This appendix summarizes the directives
recognized by f95 Fortran compiler:
General Fortran Directives
Sun Parallelization Directives
Cray Parallelization Directives
OpenMP Fortran 95 Directives, Library Routines, and Environment
C.1 General Fortran Directives
General directives accepted by f95 are described in Directives.
Table 32 Summary of General Fortran Directives
Format
|
!$PRAGMA
keyword
( a
[ , a
]
… ) [ ,
keyword ( a [ , a
]
… )
]
,… !$PRAGMA SUN
keyword
( a
[ , a
]
… ) [ ,
keyword ( a [ , a
]
… )
]
,… Comment-indicator in column 1 may be c, C,
!, or *. (We use ! in these examples.
f95 free-format must use !.)
|
C
Directive
| !$PRAGMA C(list) Declares a list of names of external functions as C language routines.
|
IGNORE_TKR
Directive
| !$PRAGMA IGNORE_TKR {name {,
name} ...} The compiler ignores the type, kind, and rank of the specified dummy
argument names appearing in a generic procedure interface when resolving a
specific call.
|
UNROLL
Directive
| !$PRAGMA SUN UNROLL=n Advises the compiler that the following loop can be unrolled to a length n.
|
WEAK
Directive
| !$PRAGMA
WEAK(name[=name2]) Declares name to be a weak symbol, or an
alias for name2.
|
OPT
Directive
| !$PRAGMA SUN OPT=n Set optimization level for a subprogram to n.
|
PIPELOOP
Directive
| !$PRAGMA SUN
PIPELOOP[=n] Assert dependency in loop between iterations n apart.
|
PREFETCH
Directives
| !$PRAGMA SUN_PREFETCH_READ_ONCE
(name) !$PRAGMA SUN_PREFETCH_READ_MANY
(name) !$PRAGMA SUN_PREFETCH_WRITE_ONCE
(name) !$PRAGMA SUN_PREFETCH_WRITE_MANY
(name) Request compiler generate prefetch instructions for references to name. (Requires
-xprefetch option, which is enabled by default. Prefetch directives can be
disabled by compiling with —xprefetch=no. Target architecture must also
support prefetch instructions, and the compiler optimization level must be set greater than
—xO2.)
|
ASSUME
Directives
| !$PRAGMA [BEGIN} ASSUME
(expression
[,probability]) !$PRAGMA END ASSUME Make assertions about conditions at certain points in the program that
the compiler can assume are true.
|
|