Intel® C++ Compiler 19.0 Developer Guide and Reference
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 name 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
You enter pragmas into your C++ source code using the following syntax:
#pragma <pragma name>
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 (parameters). |
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. |