Overview: Intel® C++ Compiler Pragmas

Pragmas are directives that provide instructions to the compiler for use in specific cases. For example, you can use the novector pragma to specify that a loop should never be vectorized. The keyword #pragma is standard in the C++ language, but individual pragmas are machine-specific or operating system-specific, and vary by compiler.

Some pragmas provide the same functionality as compiler options. Pragmas override behavior specified by compiler options.

Some pragmas are available for both Intel® and non-Intel microprocessors but they may perform additional optimizations for Intel® microprocessors than they perform for non-Intel microprocessors. Refer to the individual pragma page for detailed description.

The Intel® C++ Compiler pragmas are categorized as follows:

Intel-Specific Pragmas - pragmas developed or modified by Intel to work specifically with the Intel® C++ Compiler
Intel Supported Pragmas - pragmas developed by external sources that are supported by the Intel® C++ Compiler for compatibility reasons

Using Pragmas

You enter pragmas into your C++ source code using the following syntax:

#pragma <pragma name>

Individual Pragma Descriptions

Each pragma description has the following details:

Section	Description
Short Description	Contains a brief description of what the pragma does
Syntax	Contains the pragma syntax
Arguments	Contains a list of the arguments with descriptions
Description	Contains a detailed description of what the pragma does
Example	Contains typical usage example/s
See Also	Contains links or paths to other pragmas or related topics