IBM XL C/C++ Compilers: Difference between revisions

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{{Infobox software

| name = XL C/C++ Compilers and Open XL C/C++ Compilers

| logo =

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| developer = [[IBM]]

| latest_release_version = 1617.1.1 (LinuxAIX on Power, forLinux little-endianon distributionsPower), 1.1 (z/OS)

| latest_release_date = {{Start date and age|20182022|1209}} (Linux on Power), {{Start date and age|2022|11}} (AIX on Power), {{Start date and age|2022|05}} (z/OS)

| latest_preview_version =

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'''XL C/C++''' is the name of [[IBM]]'s [[proprietary software|proprietary]] optimizing [[C (language)|C]]/[[C++]] compilercompilers for IBM-supported environments.

==Compiler==

The IBM XL compilers are built from modularized components consisting of front ends (for different [[Programming language|programming languages]]), a platform-agnostic high-level optimizer, and platform-specific low-level optimizers/code generators to target specific hardware and operating systems. The XL C/C++ compilers target POWER, BlueGene/Q, and [[IBM Z]] hardware architectures.

=== Optimization ===

A common high level optimizer across the POWER and [[z/OS]] XL C/C++<ref>[https://www.ibm.com/products/xl-cpp-compiler-zos z/OS XL C/C++]</ref> compilers optimizes the source program using platform-agnostic optimizations such as [[interprocedural analysis]], [[profile-directed feedback]], and loop and vector optimizations.

A low-level optimizer on each platform performs function-level optimizations and generates optimized code for a specific operating system and hardware platformplatforms.

The particular optimizations performed for any given compilation depend upon the optimization level chosen under option control (O2 to O5) along with any other optimization-related options, such as those for interprocedural analysis or [[loop optimization]]s.

The XL compilers on AIX have delivered, leadershipfor scoresexample, in the [[Standard Performance Evaluation Corporation|SPEC]] CPU2000 and CPU2006 benchmarks,Floating inPoint combinationscore withof specific71.5 IBMin POWERMay system processor announcements, for example, SPEC CPU2006 Floating Point2010<ref>[http://www.spec.org/cpu2006/results/res2010q2/#SPECfp|SPEC CPU2006 Floating Point]</ref> and score of 71.54051 in May 2010 andAugust 2006.<ref>[http://www.spec.org/cpu2000/results/res2006q3/ SPEC CPU2000 Floating Point]</ref> score of 4051 in August 2006.

A 60-day installable evaluation version is available for download for XL C/C++ for AIX.<ref>[https://www.ibm.com/products/xl-cpp-aix-compiler-power/ XL C/C++ for AIX evaluation version]</ref> In June 2016, IBM introduced XL C/C++ for Linux Community Edition, which is a no-charge and fully functional

edition for unlimited production use.<ref>[https://www.ibm.com/products/xl-cpp-linux-compiler-power XL C/C++ for Linux Community Edition]</ref>

=== IBM i ===

The XL compilers on AIX have delivered leadership scores in the [[Standard Performance Evaluation Corporation|SPEC]] CPU2000 and CPU2006 benchmarks, in combination with specific IBM POWER system processor announcements, for example, SPEC CPU2006 Floating Point<ref>[http://www.spec.org/cpu2006/results/res2010q2/#SPECfp|SPEC CPU2006 Floating Point]</ref> score of 71.5 in May 2010 and <ref>[http://www.spec.org/cpu2000/results/res2006q3/ SPEC CPU2000 Floating Point]</ref> score of 4051 in August 2006.

The XL compiler on IBM i series for C/C++, is called ixlc. It is a qsh CLI based on the same assets than the CRTCPPMOD / CRTPGM system commands. It is compatible with C++98, and partially with C++11. It was discontinued in 2011.

=== IBM AIX and Linux on Power ===

Current versions of XL C/C++ for AIX (16.1) and XL C/C++ for Linux (16.1.1), are based on open-source [[Clang]] front end (part of the Clang/LLVM open source project).{{citation-needed}} They provide support for C11, C++03, C++11, and C++14.

Current versions of XL C/C++ for AIX on Power (17.1.1) and XL C/C++ for [[Linux]] on Power (17.1.1),<ref name="xlc-linux-1711">[https://www.ibm.com/support/pages/system/files/inline-files/openxl_cpp_lop_1711_fact_sheet.pdf IBM Open XL C/C++ for Linux on Power 17.1.1]</ref> are based on open-source [[Clang]] front-end (part of the Clang/LLVM open source project). In particular, XL C/C++ for AIX 17.1.0 is based on LLVM Clang 13.<ref>[https://www.ibm.com/docs/en/openxl-c-and-cpp-aix/17.1.0?topic=migration-migrating-new-llvm-clang-compiler-infrastructure Migrating to the new LLVM and Clang compiler infrastructure]</ref> Both compilers provide support for C11, C++03, C++11, and C++14. Note that while XL C/C++ for Linux on Power supports at least C++17,<ref name="xlc-linux-1711" /> some library features later than C++14 may be unavailable under XL C/C++ for AIX on Power.<ref>{{citation|url=https://www.ibm.com/docs/en/openxl-c-and-cpp-aix/17.1.0?topic=infrastructure-language-support|title="IBM Open XL C/C++ for AIX" - 17.1.0 - Language support}}</ref>

==== Licensing ====

A 60-day installable evaluation version is available for download for XL C/C++ for AIX.<ref>[https://www.ibm.com/products/xl-cpp-aix-compiler-power/ XL C/C++ for AIX evaluation version]</ref> In June 2016, IBM introduced XL C/C++ for Linux Community Edition, which is a no-charge and fully functional edition for unlimited production use.<ref>[https://www.ibm.com/products/xl-cpp-linux-compiler-power XL C/C++ for Linux Community Edition]</ref>

A new monthly pricing option is offered in XL C/C++ for AIX 16.1 and XL Fortran for AIX 16.1 to provide more flexibility for cloud-based use cases. This pricing model is on a term or subscription basis, with Software Subscription and Support included.

IBM Open XL compilers offer monthly licenses (per Virtual Processor Core); meanwhile, user-based licenses (i.e. Authorized user and Concurrent user licenses) are still available.

The next release of C/C++ and Fortran offering will fully incorporate the [[LLVM]] compiler infrastructure to combine IBM's strength in compiler optimization technology with LLVM open-source infrastructure. Now the beta version of future C/C++ and Fortran offerings are available.<ref>[https://community.ibm.com/community/user/power/blogs/si-yuan-zhang1/2020/11/20/ibm-cc-and-fortran-new-beta-compilers-available?CommunityKey=5d23d564-1e3e-47e6-8e47-71b8b65eedfd&tab=recentcommunityblogsdashboard IBM C/C++ and Fortran new beta compilers]</ref>

=== IBM Z ===

The z/OS XL C/C++ compiler exploits the latest IBM Z® systems, including the latest IBM z15™ servers. It enables the development of high-performing business applications and system programs on z/OS while maximizing hardware use and improving application performance. IBM z/OS XL C/C++ uses services provided by the z/OS Language Environment® and Runtime Library Extensions base elements. It supports embedded CICS® and SQL statements in the C/C++ source, which simplifies the operation of C/C++ within CICS and Db2® environments. It works in concert with the IBM Application Delivery Foundation for z/OS.

IBM® Open XL C/C++ V2.41.1 for z/OS® V2.4 web deliverable is the latest offering from the IBM XLnewest C/C++ compiler family,on which provides new C and C++ compilersz/OS that adoptis thefully Clangbased infrastructure fromon the LLVM open source communityLLVM for a portion of the compilersinfrastructure. z/OSOpen XL C/C++ V2.41.1 issupports designedup to aidC17/C18 inand portingC++17 codelanguage fromstandard otherfeatures platformsand toleverages z/OSthe andfeatures toof givethe aIBM morez16™ familiarmainframe, viewideal tofor developersz/OS whoUNIX areSystem accustomedServices tousers aporting UNIXapplications environmentfrom distributed platforms. IBMOpen XL C/C++ V2.41.1 foris z/OSavailable V2.4as providesa supportno-charge foradd-on thefeature corefor C11users standardwho andhave most ofenabled the C++11z/OS andXL C/C++14 standard(an featuresoptionally forpriced easierfeature) applicationon migrationz/OS to2.4 IBMor Z®z/OS servers2.5.{{citation-needed}}

==Products==

TheXL C/C++ and Open XL C/C++ compiler familyfamilies consistsconsist of the following products, with most recent version and release dates where known:

* Open XL C/C++ for AIXz/OS (Version 161.1, DecemberMay 20182022)

* Open XL C/C++ for LinuxAIX on Power for big-endian distributions (Version 1317.1.1, JuneNov 20142022)

* Open XL C/C++ for Linux on Power (Version 17.1.1, August 2022)

* XL C for AIX (Version 13.1.3, December 2015)

* XL C/C++ for Linux on Power2.4.1 for little-endianz/OS distributions2.4 (Version 16.1.1, NovemberDec 20182019)

* XL C/C++ for Linux on Power for big-endian distributions (Version 13.1, June 2014)

* z/OS XL C/C++ (Version 2.4, Sep 2019)

* z/OS XL C/C++ (Version 2.3, September 2017)

* z/OS XL C/C++ (Version 2.2, September 2015)

* XL C/C++ for z/VM (Version 1.3, December 2011)

* XL C/C++ for Linux on z Systems (Version 1.12, January 20152016)

* XL C/C++ for Blue Gene/Q (Version 12.1, June 2012)

* XL C/C++ Advanced Edition for Blue Gene (Version 9.0, September 2007, withdrawn August 2009)

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==External links==

* [https://www.ibm.com/docs/en/zosopenxl-c-and-cpp-aix/217.21.0?topic=zos-xl-cc/ Product documentation: z/OSOpen XL C/C++, V2for AIX 17.21.0]

* [https://www.ibm.com/docs/en/xl-c-and-cpp-linux/16.1.1/ Product documentation: XL C/C++ for Linux 16.1.1]

* [https://www.ibm.com/docs/en/xl-c-and-cpp-aix/16.1/ Product documentation: XL C/C++ for AIX 16.1]

* [https://www.ibm.com/docs/en/xl-c-aix/13.1.3/ Product documentation: XL C for AIX 13.1.3]

* [https://www.ibm.com/docs/en/zos/2.4.0?topic=zosopen-xl-ccc-cpp-zos/1.1 Product documentation: z/OSOpen XL C/C++, V2for z/OS 1.41]

* [https://www.ibm.com/docs/en/zos/2.34.0?topic=zos-xl-cc Product documentation: z/OS XL C/C++, V22.34]

* [https://www.ibm.com/docs/en/zos/2.2.0?topic=zos-xl-cc Product documentation: z/OS XL C/C++, V2.2]

* [https://www.ibm.com/products/xl-cpp-compiler-zos Product page: z/OS XL C/C++]

* [https://community.ibm.com/community/user/power/communities/community-home?communitykey=5d23d564-1e3e-47e6-8e47-71b8b65eedfd&tab=groupdetails Community: IBM XL C, /C++, and Fortran compilers foron Power® serverscommunity]

* [https://community.ibm.com/community/user/ibmz-and-linuxone/groups/topic-home?CommunityKey=5805da79-8284-4015-97fb-5a19f6480452 Community: IBM C/C++ compilers for IBM Z]