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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.
A 60-day installable evaluation version is available for download for the [[AIX]],<ref>[https://www.ibm.com/products/xl-cpp-aix-compiler-power/ XL C/C++ for AIX]</ref> Linux on Power and <ref>[https://www.ibm.com/
In June 2016, IBM introduced XL C/C++ for Linux Community Edition which is free of charge. It can be downloaded.<ref>[https://www.ibm.com/
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.
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* [https://www.ibm.com/support/knowledgecenter/SSLTBW_2.2.0/com.ibm.zos.v2r2.cbc/cbc.htm 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?
* [https://community.ibm.com/community/user/ibmz-and-linuxone/groups/topic-home?CommunityKey=5805da79-8284-4015-97fb-5a19f6480452 C/C++ Compilers for IBM Z - Community & Forum]
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