Developer Guide and Reference


Intel® oneAPI
Developer Guide and Reference

This document is for version 2021.4 of the compilers.
This document contains information about the
Intel® oneAPI
) compiler and runtime environment. The
Intel® oneAPI
can be found in the Intel® oneAPI Base Toolkit, Intel® oneAPI HPC Toolkit, Intel® oneAPI IoT Toolkit, or as a stand-alone compiler. More information and specifications can be found on the Intel® oneAPI DPC++/C++ Compiler main page.
In this document, you may see features labeled as experimental. An experimental feature is one that requires further testing and possible refinement. Depending on testing results, such features may be fully defined and implemented or they may be removed in a future release.
To use Microsoft C++ (MSVC) compatible options, use
The following are some important aspects of the compiler:
Compiler Setup
Compiler Setup explains how to invoke the compiler on the command line or from within an IDE.
macOS* is not supported for the
compilers. For macOS or Xcode* support, visit the
compiler: Intel® C++ Compiler Classic Developer Guide and Reference
OpenMP* Support
The compiler supports OpenMP* 5.0 Version TR4 features, and some OpenMP* Version 5.1 features.
Compiler Options
Compiler Options provides information about options you can use to affect optimization, code generation, and more. This document provides an Alphabetical List of Compiler Options for your reference.
Clang compiler options are supported for this compiler. For more information about Clang options, see the Clang documentation. The Clang website is
Intrinsics let you generate more readable code, simplify instruction scheduling, reduce debugging, access the instructions that cannot be generated using the standard constructs of the C and C++ languages, and more. For details about available intrinsics, see the interactive Intel® Intrinsics Guide at
Pragmas provide the compiler with instructions for specific tasks, including splitting large loops into smaller ones, enabling or disabling optimization for code, or offloading computation to the target.
Context Sensitive/F1 Help
To use the Context Sensitive/F1 Help feature, visit the Download Documentation: Intel® Compiler (Current and Previous) page and follow the instructions provided there.
Download Previous Versions of the Developer Guide and Reference
Visit the Download Documentation: Intel® Compiler (Current and Previous) page to download PDF or FAR HTML versions of previous compiler documentation.
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Intel oneAPI
Developer Guide and Reference.
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Product and Performance Information


Performance varies by use, configuration and other factors. Learn more at