Intel C++ Compiler 19.0 for Linux* Release Notes for Intel Parallel Studio XE 2019
Please see the licenses included in the distribution as well as the Disclaimer and Legal Information section of these release notes for details. Please see the following links for information on this release of the Intel® C++ Compiler 19.0 .
- Change History
- System Requirements
- How to Use
- Japanese Language Support
- Intel-provided debug solutions
- Technical Support
- New and Changed Features in 19.0
- Parallel STL for parallel and vector execution of the C++ STL
- Support deprecated
- Support removed
- Known Limitations
- Disclaimer and Legal Information
Changes since Intel® C++ Compiler 19.0 (New in Intel® C++ Compiler 19.0.1)
- Value safe simd options for #pragma omp simd
- New code names are to be supported in -[Q]x / -[Q]ax / -[m]tune / -[m]arch options.
- Custom memory allocator library
Changes since Intel® C++ Compiler 18.0 (New in Intel® C++ Compiler 19.0)
- Support for user defined induction for OpenMP* parallel pragmas
- Support for exclusive scan simd
- Bug fixes, including resolving a glibc issue on Ubuntu 18.04
- -openmp-simd set by default
- -rcd option deprecated
- support for cannonlake option
- Changes to mitigate speculative executive side channel and new -mindirect-branch option. Please see detailed article at Using Intel® Compilers to Mitigate Speculative Execution Side-Channel Issues available at https://software.intel.com/en-us/articles/using-intel-compilers-to-mitigate-speculative-execution-side-channel-issues)
- New C++17 features supported
- nodynamic_align and vectorlength clauses for pragma vector
- Expanded partial support for OpenMP* TR6 Version 5.0 Preview 2
- New and changed compiler options
- 2GB of RAM (4GB recommended)
- 7.5GB free disk space for all features
- One of the following Linux distributions (this is the list of distributions tested by Intel; other distributions may or may not work and are not recommended - please refer to Technical Support if you have questions):
- Debian* 8.0, 9.0
- Fedora* 27,28
- Red Hat Enterprise Linux* 6, 7
- SUSE LINUX Enterprise Server* 12 (SP5), 15
- Ubuntu* 18.04 LTS, 17.10
- CentOS 7.1, 7.2
- Intel® Cluster Ready
- Linux Developer tools component installed, including gcc, g++ and related tools
- gcc versions 4.3 - 8.x supported
- binutils versions 2.20-2.29 supported
- Library libunwind.so is required in order to use the -traceback option. Some Linux distributions may require that it be obtained and installed separately.
Additional requirements to use the integration into the Eclipse* development environment
- Eclipse Platform version 4.7 with:
- Eclipse C/C++ Development Tools (CDT) 9.2.x
- Java* Runtime Environment (JRE) 8.0 (also called 1.8) or later
- Eclipse Platform version 4.8 with:
- Eclipse C/C++ Development Tools (CDT) 9.3.x
- Java* Runtime Environment (JRE) 7.0 (also called 1.8) or later
- The Intel compilers are tested with a number of different Linux distributions, with different versions of gcc. Some Linux distributions may contain header files different from those we have tested, which may cause problems. The version of glibc you use must be consistent with the version of gcc in use. For best results, use only the gcc versions as supplied with distributions listed above.
- Compiling very large source files (several thousands of lines) using advanced optimizations such as -O3, -ipo and -openmp, may require substantially larger amounts of RAM.
- Some optimization options have restrictions regarding the processor type on which the application is run. Please see the documentation of these options for more information.
Parallel Studio XE 2019: Getting Started with the Intel® C++ Compiler 19.0 for Linux* at <install-dir>/documentation_2019/en/compiler_c/ps2019/get_started_lc.htm. contains information on how to use the Intel® C++ Compiler from the command line and from Linux*.
The Intel® C++ Compiler for Linux* does not provide "modulefiles" for usage with the Environmental Modules software utility, but is well suited for such usage. See Using Environment Modules with Intel Development Tools for further information.
Product documentation is linked from <install-dir>/documentation_2019/en/compiler_c/ps2019/get_started_lc.htm. Full documentation for all tool components is available at the Intel® Parallel Studio XE Support page.
Offline core documentation is removed from the Intel® Parallel Studio XE installed image. The core documentation for the components of Intel® Parallel Studio XE are available at the Intel® Software Documentation Library for viewing online. You can also download an offline version of the documentation from the Intel® Software Development Products Registration Center: Product List > Intel® Parallel Studio XE Documentation.
Intel® compilers optionally provide support for Japanese language users when the combined English-Japanese product is installed. Error messages, visual development environment dialogs and some documentation are provided in Japanese in addition to English. By default, the language of error messages and dialogs matches that of your operating system language selection.
Japanese language support is provided with update 1 of the product.
- Intel®-provided debug solutions are based GNU* GDB. Please see Intel® Parallel Studio XE 2019 Composer Edition C++ - Debug Solutions Release Notes for further information.
Product samples are now available online at Intel® Software Product Samples and Tutorials
If you did not register your compiler during installation, please do so at the Intel® Software Development Products Registration Center at http://registrationcenter.intel.com. Registration entitles you to free technical support, product updates and upgrades for the duration of the support term.
For information about how to find Technical Support, Product Updates, User Forums, FAQs, tips and tricks, and other support information, please visit: http://www.intel.com/software/products/support/
Note: If your distributor provides technical support for this product, please contact them for support rather than Intel.
The following features are new or significantly enhanced in this version. For more information on these features, please refer to the documentation.
Currently "#pragma omp simd" overrides FP value and exception safe settings. The following options change that legacy behaviour and produce value and exception safe code even for SIMD loops.
- Qsimd-honor-fp-model[-]: Tells the compiler to obey the selected floating-point model when vectorizing SIMD loops
- Qsimd-serialize-fp-reduction[-]: Tells the compiler to serialize floating-point reduction when vectorizing SIMD loops.
OpenMP SIMD specification and FP model flag can contradict in the requirement. Compiler’s default is to follow OpenMP specification and vectorize the loop. With this new flag, programmer can override so that the compiler follows the FP model flag instead and serialize the loop
Note1: When –qsimd-honor-fp-model is used and OpenMP SIMD reduction specification is the only thing causing serialization of entire loop addition of qsimd-serialize-fp-reduction will result in vectorization of the entire loop except reduction calculation which will be serialized.
Note2: This option does not affect auto-vectorization of loops.
code names supported :cascadelake, kabylake, coffeelake, amberlake, whiskeylake.
A new library "libqkmalloc" library is provided in the Intel C++ compiler 19.0 update 1. It provides a C level interface "qkmalloc()" for memory allocation. This allocation would replace standard routines.
- void* malloc(size_t size)
- void free(void* ptr)
- void* calloc(size_t nobj, size_t size)
- void* realloc(void* ptr, size_t size)
It also provides non C99 standard compliant memory allocation routine, which uses "weak" alignment void* _wmalloc(size_t size)
To use the library -
- Set the libqkmalloc.so path to the LD_PRELOAD =$INSTALL_DIR/compiler/linux/libqkmalloc.so
- Alternatively, define the linker option. Add -L and –l to indicate location and name of the library -L$QKMALLOC_LIB_PATH -lqkmalloc. Set up LD_LIBRARY_PATH environment variable at runtime to the library path (LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$QKMALLOC_LIB_PATH").
Note:Non-Intel microprocessors runs the standard system malloc.
- Explicit syntax for dynamic alignment
#pragma vector dynamic_align[(pointer)] #pragma vector nodynamic_align
With no pointer specified, compiler behaves normally (automatically decides which pointer has to be aligned or doesn’t generate peel loop at all). With pointer specified, compiler generates peel loop for that pointer. With nodynamic_align clause, the compiler will not generate a peel loop.
- #pragma vector vectorlength(vl1,vl2, .. , vln)
#pragma vector vectorlength(vl1,vl2, .. , vln)
Vectorizer chooses best vector length from the list according to cost model. If all vector length from the list are not profitable, the loop remains scalar. This pragma doesn’t force vectorization, thus it can be safely used for all loops.
Language features from the OpenMP* Technical Report 6 : Version 5.0 Preview 2 specifications are now supported.
- Explicit syntax for inclusive scan *
#pragma omp simd reduction[parallel](inscan, operator:list)
#pragma omp scan inclusive(item-list)
- Explicit syntax for exclusive scan *
#pragma omp simd reduction[parallel](inscan, operator:list)
#pragma omp scan exclusive(item-list)
Prefix sum is computed correctly during vector execution
- UDI for OpenMP* Parallel pragmas
#pragma omp declare induction ( induction-id : induction-type :step-type : inductor ) [collector( collector )]
For more information, see the compiler documentation or the link to the OpenMP* Specification above.
The Intel® C++ Compiler 19.0 supports the following features under the /Qstd=c++17 (Windows*) or -std=c++17 (Linux*/OS X*) options:
- Fold expressions(N4295)
- Inline variables(P0386R2)
- Construction rules for enum classes(P0138R2)
- Removing deprecated dynamic exception specifications(P0003R5)
- Make exception specifications part of the type system(P0012R1)
- constexpr lambda expressions(P0170R1)
- Lambda capture of *this(P0018R3)
- constexpr if-statements(P0292R2)
- Structured bindings(P0217R3)
- Separate variable and condition for if and switch(P0305R1)
- Please see C++17 Features Supported by Intel® C++ Compiler for an up-to-date listing of all supported features, including comparisons to previous major versions of the compiler.
The Intel® C++ Compiler 19.0 supports the following features under the /Qstd=c++14 (Windows*) or -std=c++14 (Linux*/OS X*) options:
- Please see C++14 Features Supported by Intel® C++ Compiler for an up-to-date listing of all supported features, including comparisons to previous major versions of the compiler.
The Intel® C++ Compiler 19.0 supports the following features under the /Qstd=c++11 (Windows*) or -std=c++11 (Linux*/OS X*) options:
- Please see C++11 Features Supported by Intel® C++ Compiler for an up-to-date listing of all supported features, including comparisons to previous major versions of the compiler.
The Intel® C++ Compiler supports the C11 features under the /Qstd=c11 (Windows*) or -std=c11 (Linux*/OS X*) options:
- Please see C11 Support in Intel® C++ Compiler for an up-to-date listing of all supported features, including comparisons to previous major versions of the compiler.
For details on these and all compiler options, see the Compiler Options section of the Intel® C++ Compiler 19.0 User's Guide.
- -qopenmp-simd set by default
- New -xcannonlake option
- New -mtune=cannonlake option
- -rcd option enabled “fast” float-to-integer conversions, by using round-to-nearest instead of truncating rounding. This option has been deprecated.
For a list of deprecated compiler options, see the Compiler Options section of the Intel® C++ Compiler 19.0 User's Guide.
Intel(R) C++ Compiler is installed with Parallel STL, an implementation of the C++ standard library algorithms with support for execution policies.
- More algorithms support parallel and vector execution policies: find_first_of, is_heap, is_heap_until, replace, replace_if.
- More algorithms support vector execution policies: remove, remove_if.
- More algorithms support parallel execution policies: partial_sort.
To learn more, please refer to article https://software.intel.com/en-us/get-started-with-pstl
Intel® Cilk™ Plus is a deprecated feature since Intel® C++ Compiler 18.0. For more information see Migrate Your Application to use OpenMP* or Intel® Threading Building Blocks (Intel® TBB) Instead of Intel® Cilk™ Plus
Offload support for Intel® Graphics Technology has been removed
unseq and par_unseq policies only have effect with compilers that support '#pragma omp simd' or '#pragma simd. Parallel and vector execution is only supported for a subset of algorithms if random access iterators are provided, while for the rest execution will remain serial. Depending on a compiler, zip_iterator may not work with unseq and par_unseq policies.
When using the -check-pointers option, the runtime library
libchkp.so must be linked in. When using options like -static or -static-intel with -check-pointers, be aware that this dynamic library will be linked in regardless of your settings. See the article at Pointer Checker in ICC for more information.
Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.
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