Intel® C and C++ Compilers

Leadership application performance

  • Rich set of components to efficiently implement higher-level, task-based parallelism
  • Future-proof applications to tap multicore and many-core power
  • Compatible with multiple compilers and portable to various operating systems

Performance without compromise

  • Industry leading performance on Intel and compatible processors.
  • Extensive optimizations for the latest Intel processors, including Intel® Xeon Phi™ coprocessor
  • Scale forward with support multi-core, manycore and multiprocessor systems with OpenMP, automatic parallelism, and Intel Xeon Phi coprocessor support
  • Patented automatic CPU dispatch feature gets you code optimized for the current running processor runs code optimized for specified processors identified at application runtime.
  • Intel® Performance Guide provides suggestions for improving performance in your Windows* applications.

Broad support for current and previous C and C++ standards, plus popular extensions

  • Language support with full C++11 and most C99 support. For details on C++11, see
  • Extensive OpenMP 4.0* support

Faster, more scalable applications with advanced parallel models and libraries

Intel provides a variety of scalable, easy to use parallel models. These highly abstracted models and libraries simplify adding both task and vector parallelism. The end result is faster, more scalable applications running on multi-core and manycore architectures.

Intel® Cilk™ Plus (included with Intel C++ compiler)

  • Simplifies adding parallelism for performance with only three keywords
  • Scale for the future with runtime system operates smoothly on systems with hundreds of cores.
  • Vectorized and threaded for highest performance on all Intel and compatible processors
  • Click here for sample code, contributed libraries, open specifications and other information from the Cilk Plus community.
  • Included with Intel C++ compiler and available in GCC 4.9 development branch (with –fcilkplus and the caveat that Cilk_for is not supported yet in a Clang*/LLVM* project at
  • More information

OpenMP 4.0 (included with Intel C++ compiler)

  • Support for most of the new features in the OpenMP* 4.0 API Specification (user-defined reductions not yet supported)
  • Support for C, C++, and Fortran OpenMP programs on Windows*, Linux*, and OS X*
  • Complete support for industry-standard OpenMP pragmas and directives in the OpenMP 3.1 API Specification
  • Intel-specific extensions to optimize performance and verify intended functionality
  • Intel compiler OpenMP libraries are object-level compatible with Microsoft Visual C++* on Windows and GCC on Linux*

Intel® Math Kernel Library

  • Vectorized and threaded for highest performance using de facto standard APIs for simple code integration
  • C, C++ and Fortran compiler-compatible with royalty-free licensing for low cost deployment
  • More information

Intel® Integrated Performance Primitives

  • Performance: Pre-optimized building blocks for compute-intensive tasks
  • A consistent set of APIs that support multiple operating systems and architectures
    • Windows*, Linux*, Android*, and OS X*
    • Intel® Quark™, Intel® Atom™, Intel® Core™, Intel® Xeon®, and Intel® Xeon Phi™ processors
  • More information

Intel® Threading Building Blocks

  • Rich set of components to efficiently implement higher-level, task-based parallelism
  • Compatible with multiple compilers and portable to various operating systems
  • More information

Intel® Media SDK 2014 for Clients

  • A cross-platform API for developing consumer and professional media applications.
  • Intel® Quick Sync Video: Hardware-accelerated video encoding, decoding, and transcoding.
  • Development Efficiency: Code once now and see it work on tomorrow's platforms.
  • More information

A drop-in addition for C and C++ development

  • Windows*
    • Develop, build, debug and run from the familiar Visual Studio IDE
    • Works with Microsoft Visual Studio* 2008, 2010, 2012 and 2013
    • Source and binary compatible with Visual C++*
  • Linux*
    • Develop, build, debug and run using Eclipse* IDE interface or command line
    • Source and binary compatible with GCC
  • OS X*
    • Develop, build, debug and run from the familiar Xcode* IDE
    • Works with Xcode 4.6, 5.0 and 5.1
    • Source and binary compatible with LLVM-GCC and Clang* tool chains
  • 32-bit and 64-bit development included

  1. Project and source in Visual Studio
  2. C/C++ aware text editor
  3. Debug C/C++ code
  4. Call Stack information
  5. Set breakpoints at certain source lines on IDE.

Outstanding support

One year of support included with purchase – gives you access to all product updates and new versions released in the support period plus access to Intel Premier Support. There's a very active user forum for help from experienced users and Intel engineers

  • Videos on Getting Started with Intel® C++ Compiler
  • Vectorization Essentials
  • Performance Essentials with OpenMP 4.0 Vectorization
  • View slides

Register for future Webinars

Previously recorded Webinars:

  • Update Now: What’s New in Intel® Compilers and Libraries
  • Performance essentials using OpenMP* 4.0 vectorization with C/C++
  • Intel® Cilk™ Plus Array Notation - Technology and Case Study Beta
  • OpenMP 4.0 for SIMD and Affinity Features with Intel® Xeon® Processors and Intel® Xeon Phi™ Coprocessor
  • Introduction to Vectorization using Intel® Cilk™ Plus Extensions
  • Optimizing and Compilation for Intel® Xeon Phi™ Coprocessor

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Intel(R) System Studio Developer Story : How to configure, build and profile the Linux Kernel of Android by using the VTune
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Intel(R) System Studio Developer Story: How to configure, build, debug and optimize key parts of your mobile software stack for Android* 1. Set-up and configure a development environment. (1) The target HW environment    In this article, a Minnow board MAX is used for a HW platform. The Minnow...
Building OpenCV 3.0 based embedded application using Intel® System Studio 2015
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We describe how to use Intel® System Studio 2015 to build the OpenCV 3.0 based embedded application on Intel platforms. In this paper, we have considered a sample code that is part of OpenCV, how to use different components of Intel® System Studio to build OpenCV sample code.
Intel® System Studio - Multicore Programming with Intel® Cilk™ Plus
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Intel System Studio not only provides a variety of signal processing primitives via Intel® Integrated Performance Primitives (Intel® IPP), and Intel® Math Kernel Library (Intel® MKL), but also allows developing high-performance low-latency custom code (Intel C++ Compiler with Intel Cilk Plus). Si...
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Article speaking about taking advantage of using Intel® System Studio with MinnowBoard MAX. MinnowBoard MAX is an open hardware embedded board designed with the Intel® Atom™ E38xx series SOC (code name Baytrail).
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Supplemental Documentation

Intel® MKL Sparse BLAS Overview
By Naveen Gv (Intel)Posted 06/25/20120
Sparse BLAS routines can be useful to implement iterative methods for solving large sparse systems of equations or eigenvalue problems
Intel Guide for Developing Multithreaded Applications
By adminPosted 01/16/201224
The Intel® Guide for Developing Multithreaded Applications covers topics ranging from general advice applicable to any multithreading method to usage guidelines for Intel® software products to API-specific issues.
Elemental functions: Writing data parallel code in C/C++ using Intel® Cilk™ Plus
By Robert Geva (Intel)Posted 01/24/20116
Intel® Cilk™ Plus provides simple to use language extensions to express data and task-parallelism to the C and C++ language. This article describes one of these programming constructs: “elemental functions”.
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Announcing new product: Intel® Data Analytics Acceleration Library 2016 Beta
By Jennifer J. (Intel)0
We are pleased to announce the release of Intel® Data Analytics Acceleration Library 2016 Beta! Intel® Data Analytics Acceleration Library is a C++ and Java API library of optimized analytics building blocks for all data analysis stages, from data acquisition to data mining and machine learning. It is a library essential for engineering high performance data application solutions. Click here to see more.
OS X 10.9 Xcode 5 error can't open "stdlib.h" OR ld: library not found for -lcrt1.10.6.o
By Ronald W Green (Intel)0
Environment:  OS X 10.9 (Mavericks) and Xcode 5.0 Command line compilations/links fail with either: "catastrophic error: cannot open source file "stdlib.h" OR with "ld: library not found for -lcrt1.10.6.o" Affected compiler:  Intel Composer XE 2013 Update 1 Root cause:  Xcode 5.0 installation does not install all command line tools (include files, libraries, SDKs) need for the compiler to link user applications.  FIX: Install the Xcode 5.0 "Command Line Tools".  Follow this Knowledge Base article for installation of this package:
ld: cannot find -lm when building with -static or -fast
By Ronald W Green (Intel)0
RHEL 6.x, FC14, FC13, FC12, SL6.x, CentOS 6, etc. and possibly other recent distributions: error when using -static or -fast: ld: cannot find -lm See this article:
IDB use under Mac OS* X 10.7 Lion
By Ronald W Green (Intel)0
In order to debug applications built by the Intel Composer XE 2011 ( Updates 6, 7, 8, and possible future updates ) under Mac OS* X 10.7 Lion, the following options are required: -g -save-temps -fpic -Wl,-no_pie Further information can be found here: does not affect users running Mac OS* X 10.6 Snow Leopard or Mac OS* X 10.5 Leopard.
Bug in exp()?
By SomeScientist0
Hello again,  as my last post went by unnoticed, I chose to restate my question. While analyzing Intel-compiled code, I stumbled upon an interesting code snippet I cannot find another explanation than a potential bug. I wrote the following test program: #include <stdio.h> #include <math.h> #include <stdlib.h> int main(int argc, char *argv[]) { if(argc < 2) { printf("argument for exp() is needed\n"); printf("call %s <the xth power>\n", *argv); return EXIT_FAILURE; } double power = atof(argv[1]); double result = exp(power); printf("The exponential value of %lf is %lf\n", power, result); return EXIT_SUCCESS; }The code was compiled with "-O1 -g". Here, we could further pinpoint the original error. The culprit is found in libimf.a. If you extract it, you can find the file exp_wmt.o, having the public function exp.J (exp_J). I'll post again some instructions of the erroneous basic block: .text:080001C2 jmp loc_80002EB...
Error compililing qhull library with icc & icpc
By puneet s.4
I am trying to compile octave with intel compilers.I am facing trouble building downloaded qhull-2012.1-src.tgz dependency for octave. now while trying to compile the qhull package (with cmake)cmake .. -DCMAKE_CXX_COMPILER=icpc -DCMAKE_CC_COMPILER=icc i get following error:   In file included from /usr/include/limits.h:125, from /home/puneet/OCTAVE/qhull-2012.1/src/libqhull/qhull_a.h:42, from /home/puneet/OCTAVE/qhull-2012.1/src/libqhull/global.c:19: /opt/intel/include/limits.h:36:54: error: missing binary operator before token "(" /home/puneet/OCTAVE/qhull-2012.1/src/libqhull/global.c: In function ‘qh_clear_outputflags’: /home/puneet/OCTAVE/qhull-2012.1/src/libqhull/global.c:182: error: ‘DBL_MAX’ undeclared (first use in this function) /home/puneet/OCTAVE/qhull-2012.1/src/libqhull/global.c:182: error: (Each undeclared identifier is reported only once /home/puneet/OCTAVE/qhull-2012.1/src/libqhull/global.c:182: error: for each function it appears ...
Installation of Parallel Studio XE Composer Edition c++ 2015 fails on clean Windows 8.1 system
By BURGI Berlin7
Hello, I have problems installing the Parallel Studio XE 2015 Composer Edition for C++. The installation ends immediately after displaying the setup splash screen for about 1 second, also after a clean Windows 8.1 installation. The last lines in the log files are always the same: ... [t13b4 2015.03.23 10.56.01 0000003f] [message_processor]: INFO: Registered: zip ( [t13b4 2015.03.23 10.56.01 00000040] [message_processor]: INFO: Registered: zip script ( [t13b4 2015.03.23 10.56.01 00000041] [message_processor]: CRITICAL: Failed to load plugin: action [t13b4 2015.03.23 10.56.01 00000042] [message_processor]: CRITICAL: Failed to load plugin: cache [t13b4 2015.03.23 10.56.01 00000043] [message_processor]: CRITICAL: Failed to load plugin: catalog [t13b4 2015.03.23 10.56.01 00000044] [message_processor]: CRITICAL: Failed to load plugin: sizer [t13b4 2015.03.23 10.56.01 00000045] [message_processor]: CRITICAL: Failed to load plugin: system/string list -END OF LOG- ...
Centos support
By andrei k.1
Hello, which Parallel Studio SP1 update is compatible with my Centos OS 6.5. I tried to download Sp1 update 4 but the install says my OS is not supported. I was not able to find XE dedicated forum to post it
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A new version of CilkPlus/LLVM compiler is available!
By Andrew Tischenko (Intel)0
Hi All! We’re glad to inform you that a new version of CilkPlus LLVM-based compiler available now on Cilk Plus/LLVM. This version fully supports Intel® Cilk™ Plus Language Extension Specification Version 1.2, including C-Extended Array Notation missed in the previous version of the compiler. In addition, a lot of bugs were fixed, including variable length arrays support in _Cilk_spawn calls. We’re encouraging you to download the new compiler and to play with it. All your comments are welcome! Andrew V. Tischenko ================= Software Engineer Intel Compiler Team  
Cilk Plus for GCC 4.8
By Barry Tannenbaum (Intel)0
Binary versions of the GNU Compiler Collection (GCC) C and C++ 4.8 compilers with the cilkplus extension are now available from . The binaries support the x86-32 and x86-64 architectures on Ubuntu* Linux*. The source for these compilers is available at  . These compilers are provided as a convenience. This branch is under active development and should not be used for production code. The compilers are not guaranteed to be up-to-date or error-free. Questions, bug reports, or issues should be posted in this forum. Cilk Plus is also being integrated into the next version of the GCC C and C++ compilers.  Sources for that version are available at .
Announcement: Version 1.2 of the Cilk Plus Language Specification released
By Pablo Halpern (Intel)0
We are pleased to announce an update to the Intel® Cilk™ Plus Language Specification.  This document describes the syntax and semantics of the Cilk™ Plus language constructs that were added to the C and C++ programming languages.  This version of the specification was relseased in September, 2013 and supersedes the 1.1 version of the same specification released in July, 2011.  This version adds no new features to the language extensions described in the V1.1 specification, but contains numerous corrections and clarifications.  A few obsolete constructs were removed.  It is recommended that implementors adding Cilk Plus extensions to their compilers base their changes on this document instead of the V1.1 document. The new spec is available on the Open Specifications download page on
Cilkpub: a library of community-contributed Cilk Plus code
By Jim Sukha (Intel)3
We are pleased to announce that Cilkpub, a library of community-contributed Cilk Plus code, is now available for download. Cilkpub is intended to be a public library of code contributed and maintained by the members of the Cilk Plus community. Version 1.02 has been posted to the community website and contains the following modules: DotMix DPRNG: a deterministic parallel random number generator for Cilk Plus, contributed by Tao B. Schardl and myself. Sort: a module containing parallel implementations of quicksort and sample sort, contributed by Arch Robison.   This code is derived from the sorts described in Structured Paralllel Programming. Cilkpub is distributed as a source code.  The DotMix and Sort modules are implemented using C++ templates, and consist of only header files. If you have your own Cilk Plus code that you would like to share with the world, please consider contributing your code!   The Cilkpub project is still in its early stages, and we hope to expand the librar...
Cilk Plus/LLVM available on Github
By Ben Langmuir (Intel)3
Hi all, I am pleased to announce that the source code for our in-progress implementation of the Intel Cilk Plus extensions in Clang/LLVM is now available on Github: This is an early release, and is not yet feature-complete. Right now, only spawn and sync are supported, as well as anything that only requires the runtime library, such as hyperobjects. We will of course be adding the rest of the Intel Cilk Plus extensions over time, including cilk_for and the vectorization features. More information about the current status, including supported platforms and known issues is available at We would love to hear your feedback (and bug reports!) – either on this forum, or via the github issue tracker  Ben
New Cilk Plus website -
By Bethany Dalby (Intel)1
Check out the new Intel® Cilk Plus™ website  Learn about the latest product information, download tools and samples, submit contributions, and much more! If you have any comments or suggestions, we would love to hear them.
Intel Cilk Plus SDK - Cilkscreen and Cilkview for Intel Cilk Plus
By Barry Tannenbaum (Intel)6
The Intel Cilk Plus SDK (Software Development Kit) is now available as a WhatIf kit. It supplies the Cilkscreen race detection and Cilkview scalability tools for Intel Cilk Plus developers working on the Microsoft Windows* and Linux* operating systems. More information can be found at the Intel Cilk Plus Download page. Support for the Intel Cilk Plus SDK will be provided through the Intel Cilk Plus forum. Note: You must have SP1 or later of the Intel Parallel Composer 2011 or Intel C++ Composer XE 2011 products. - Barry
GCC Cilk Plus: warning: unused variable 'sf_01;
By dsf4233
Hello, and thank you for your time. I've just installed a fresh version of GCC Cilk Plus, and my first simple program is presenting an anomalous warning. /home/david/cilkplus-install/bin/g++ -Wall -O0 -fcilkplus -o hello_cilk hello_cilk.cpp -Wl,-rpath=/home/david/cilkplus-install/lib64 -lcilkrts -lpthread -ldl In function ‘int fib(int)’: cc1plus: warning: unused variable ‘sf_01’ [-Wunused-variable] In function ‘int main(int, char**)’: cc1plus: warning: unused variable ‘sf_02’ [-Wunused-variable] I've seen this warning mentioned in some other threads in this forum and other places on the internet, but I never found a definite cause or resolution. I'm curious if the Cilk Plus team has an explanation/resolution (or at least an intuition that this won't cause a problem).  The program in question: //Hello to GCC Cilk! #include <iostream> const int iterations = 1000000; void adder( int& a){ for(int i=0; i < iterations; i++) a++; } void subber( int...
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