Intel C++ Compiler 19.0 for macOS* Release Notes for Intel Parallel Studio XE 2019

This document provides a summary of new and changed product features and includes notes about features and problems not described in the product documentation.

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

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This section highlights important from the previous product version and changes in product updates.

Changes since Intel® C++ Compiler 19.0.5 (New in Intel® C++ Compiler 19.0.8)

This is release for Intel® Compilers 2019 Update 8, compilers version 19.0.8. Highlights for this release:

• Intel(R) Parallel Studio XE 2019 Update 6 Composer Edition contains Compiler Update 8.
• Compilers Update 6 and 7 are not available to the general public.
• Compilers Update 6 and 7 were special releases not available to all customers.
• Corrections to reported problems
• Includes certain functional and security updates. We recommend updating for these functional and security updates.

Changes since Intel® C++ Compiler 19.0.4 (New in Intel® C++ Compiler 19.0.5)

• Note: macOS* 10.15 Catalina and Xcode* 11.0 are not supported in this release. Users will see issues with installation of the Intel Compilers for 2019 Update 5 and prior releases, no Xcode 11 integration, and other possible errors due to incompatibility. Users are advised to delay upgrading to macOS* 10.15 and Xcode 11 until we officially support this environment. Support for macOS* 10.15 and Xcode 11 will be provided in a future release.
• Support for Xcode 10.3
• Corrections to reported problems
• Includes certain functional and security updates. We recommend updating for these functional and security updates.

Changes since Intel® C++ Compiler 19.0.3 (New in Intel® C++ Compiler 19.0.4)

• Support for Xcode 10.2
• Corrections to reported problems

Changes since Intel® C++ Compiler 19.0.2 (New in Intel® C++ Compiler 19.0.3)

• Support for Xcode 10.1
• Corrections to reported problems

Changes since Intel® C++ Compiler 19.0.1 (New in Intel® C++ Compiler 19.0.2)

• Intel® C++ Compiler 19.0 Update 2 includes functional and security updates. Users should update to the latest version.

Changes since Intel® C++ Compiler 19.0 (New in Intel® C++ Compiler 19.0.1)

• macOS* 10.14 and Xcode* 10 support
• Corrections to reported problems

Changes since Intel® C++ Compiler 18.0 (New in Intel® C++ Compiler 19.0 )

• 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 /content/www/us/en/develop/articles/using-intel-compilers-to-mitigate-speculative-execution-side-channel-issues.html)

System Requirements

• A 64-bit Intel®-based Apple* Mac* system host
• 2GB RAM minimum, 4GB RAM recommended
• 3GB free disk space
• One of the following combinations of mac OS*, Xcode* and the Xcode SDK:
  • macOS* 10.13, macOS* 10.14
  • Xcode* 9.4, Xcode* 10.2, 10.3
• If doing command line development, the Command Line Tools component of Xcode* is required

Note: Advanced optimization options or very large programs may require additional resources such as memory or disk space.

How to use the Intel® C++ Compiler

Parallel Studio XE 2019 : Getting Started with the Intel® C++ Compiler 19.0 for mac OS* at <install_dir>/documentation_2019/en/compiler_c/ps2019/get_started_mc.htm contains information on how to use the Intel® C++ Compiler from the command line and from Xcode*.

Documentation

Product documentation is linked from <install-dir>/documentation_2019/en/compiler_c/ps2019/get_started_mc.htm. Full documentation for all tool components is available at the Intel® Parallel Studio XE Support page.

Offline Core Documentation Removed from the Installed Image

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-provided debug solutions

• Intel®-provided debug solutions are based GNU* GDB. Please see Intel® Parallel Studio XE 2019 Composer Edition C++ - Debug Solutions Release Notes further information.

Samples

Product samples are now available online at Intel® Software Product Samples and Tutorials

Redistributable Libraries

Refer to the Redistributable Libraries for Intel® Parallel Studio XE for more information.

Technical Support

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.

New and Changed Features

This option is supported in versions 19.0 update 8 of the compiler and above. The details about this option can be found in the Intel® C++ Compiler 19.1 Developer Guide and Reference here.

To find more information, see https://www.intel.com/content/dam/support/us/en/documents/processors/mitigations-jump-conditional-code-erratum.pdf

The Intel® Software License Manager has been updated to version 2.9 for this release. You must upgrade to this version before installing Intel Parallel Studio XE 2019 Update 4 with a floating license. Please refer for more details:

Intel® Software License Manager Download
Intel® Software License Manager Release Notes

Please refer here for more details.

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.

• 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[parallel] scan(scan-op: item-list)
#pragma omp inclusive_scan(item-list)
• Explicit syntax for exclusive scan *
  #pragma omp simd[parallel] scan(scan-op: item-list)
#pragma omp inclusive_scan(item-list)
  Prefix sum is computed correctly during vector execution
  *The syntax will be renamed in product release
• 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*/macOS*) 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*/macOS*) 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*/macOS*) 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*/macOS*) 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
• Canary bytes are cleared right after read with /GS 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++ Compiler19.0 User's Guide.

Parallel STL for parallel and vector execution of the C++ STL

Intel(R) C++ Compiler is installed with Parallel STL, an implementation of the C++ standard library algorithms with support for execution policies.

Features/APi changes

• 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

Support Deprecated

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

Support Removed

Removed support for 32 bit applications on macOS

Starting with the 19.0 release of the Intel® C++ Compiler, macOS 32-bit applications are no longer supported. If you want to compile 32-bit applications, you should use an earlier version of the compiler and Xcode* 9.4 or earlier.

Known Limitations

Tachyon deprecated from samples

In macOS 10.15, apple removed openGL framework, hence PSXE samples such as Tachyon uses openGL is also deprecated.

Xcode* 10 and Xcode* 11, new build system not supported

The Xcode 10 Beta introduced a “New Build System (Default)” which currently do not support custom compilers.You will see the error 'no rule to process file' when building an Intel C++ Compiler project within XCode 10 and Xcode 11. To use Intel compilers, switch to “Legacy Build System” in Project Settings.

Slow License Checkout macOS* 10.15 Catalina*

The license checkout performance on macOS Catalina 10.15 is roughly 1.1 seconds per source file. This is a 10x slowdown on this OS compared to previous versions of macOS. We are evaluating our license technology for a solution but at this time we have not root caused the issue. If this slowdown is an issue, please revert back to the previous macOS 10.14 where this slowdown does not occur.

Parallel STL

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.

Disclaimer and Legal Information

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Intel may make changes to specifications and product descriptions at any time, without notice. Designers must not rely on the absence or characteristics of any features or instructions marked 'reserved' or 'undefined.' Intel reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them. The information here is subject to change without notice. Do not finalize a design with this information.

The products described in this document may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current characterized errata are available on request.

Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.

Copies of documents which have an order number and are referenced in this document, or other Intel literature, may be obtained by calling 1-800-548-4725, or go to: http://www.intel.com/design/literature.htm

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The Intel® C++ Compiler is provided under Intel's End User License Agreement (EULA).

Please consult the licenses included in the distribution for details.

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