Developer Guide and Reference



Pragmas are directives that provide instructions to the compiler for use in specific cases. For example, you can use the
pragma to specify that a loop should never be vectorized. The keyword
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

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:
Short Description
Contains a brief description of what the pragma does.
Contains the pragma syntax.
Contains a list of the arguments (parameters).
Contains a detailed description of what the pragma does.