Lowers the optimization level used by the HP Fortran compiler.
Syntax
where +On (or -On) specifies a level of optimization that is equal
to or less than the level specified on the command line.
Description
The OPTIONS statement is an extension of HP Fortran and is
used to specify a level of optimization that is equal to or less
than the level specified on the command line. If the level specified
by the OPTIONS statement is higher than that specified on the
command line, the statement is ignored.
The OPTIONS statement must be placed outside all program units.
The changed level of optimization applies to the beginning of the
next program unit and remains in effect for all succeeding program
units or until superseded by another OPTIONS statement or by the !$HP$
OPTIMIZE directive.
The OPTIONS statement differs from the OPTIMIZE directive
in that the OPTIMIZE directive enables or disables optimization
but does not change the optimization level. The !$HP$ OPTIMIZE directive
is described in the HP Fortran Programmer’s Guide.
The OPTIMIZE directive takes precedence over the OPTIONS statement:
when the OPTIMIZE directive is used to disable optimization, any
subsequent OPTIONS statement has no effect until a later directive
enables optimization.
Examples
In the following example, the first OPTIONS statement optimizes
the subroutine go_fast at optimization level 3. The second OPTIONS
statement lowers the optimization level to 2.
OPTIONS +O3
SUBROUTINE go_fast
...
END SUBROUTINE go_fast
OPTIONS +O2
SUBROUTINE not_so_fast
...
END SUBROUTINE not_so_fast |
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