Vax C90-EL SERIES Service Manual download pdf (Page 65)

#pragma Directives [3]

#pragma directives are used within the source program to request certain kinds

of special processing. #pragma directives are part of the C and C++ languages,

but the meaning of any #pragma directive is defined by the implementation.

#pragma directives are expressed in the following form:

#pragma [ _CRI] identifier [arguments]

The _CRI specification is optional and ensures that the compiler will issue a

message concerning any directives that it does not recognize. Diagnostics are not

generated for directives that do not contain the _CRI specification.

These directives are classified according to the following types:

• General

• Instantiation (Cray Standard C++ only)

• Vectorization

• Scalar

• Tasking

• Inlining

Macro expansion occurs on the directive line after the directive name. That is,

macro expansion is applied only to arguments. For example, if NUM_CHUNKS is a

macro defined with a value 8, the original code is as follows:

#pragma _CRI taskloop numchunks(NUM_CHUNKS)

The expanded code is equivalent to the following:

#pragma _CRI taskloop numchunks(8)

At the beginning of each section that describes a directive, information is

included about the compilers and systems that allow the use of the directive,

and the scope of the directive. Unless otherwise noted, the following default

information applies to each directive:

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Vax C90-EL SERIES Service Manual Page 65