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=== IBM AIX and Linux ===
The XL compilers on AIX have delivered, for example, SPEC CPU2006 Floating Point score of 71.5 in May 2010<ref>[http://www.spec.org/cpu2006/results/res2010q2/#SPECfp|SPEC CPU2006 Floating Point]</ref> and score of
Current versions of XL C/C++ for AIX (17.1.1) and XL C/C++ for Linux (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>
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