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An HPF directive has the form of a comment line:
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!HPF$ hpf-directive
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A goal of the design is that HPF directives should be consistent with Fortran 90 syntax in the following strong sense: if HPF were to be adopted as a part of a future Fortran standard, the only change necessary to convert an HPF program would be to remove the comment character and directive prefix from each directive.
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There is a clear separation between directives that serves as specification statements and directives that serve as executable statements ( in the sense of the Fortran standard). Specification statements are carried out on entry to a program unit; after these, executable statements are carried out.
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