Announcement: IBM z/OS XL C/C++ to adopt LLVM open-source infrastructure Learn more. White papers Code optimization with the IBM z/OS XL C/C++ Compiler This document introduces the most important capabilities that you can use to maximize the performance of your application. Read the white paper Upgrading z/OS XL C/C++ compilers New features were introduced in the last few releases of the compiler, and their benefits are outlined in this paper. Read the white paper Using inline assembly for z/OS XL C/C++ compiler Two ways to use high-level languages in low-level programming Read the white paper Debugging optimized code Using architecture sections and run-time architecture checks Read the white paper SOS info utility for z/OS XL C/C++ compiler Obtain the options information from an executable file without the need to produce and maintain listing files. Read the white paper AutoSIMD compiler optimization for z/OS XL C/C++ programs Learn about the AutoSIMD optimization introduced in the z/OS V2R2 XL C/C++ compiler. Read the white paper Other resources Learn how to develop applications with IBM Enterprise Metal C for z/OS This video gives an overview of IBM Enterprise Metal C for z/OS, which provides system program development on z/OS. Watch the video (02:47) IBM Doc Buddy mobile app Download the app where you can search for the error messages in IBM z/OS XL C/C++ Read the solution brief (link resides outside ibm.com) z/OS XL C/C++ documentation library This document contains a collection of announcement letters and product documentation for z/OS XL C/C++. Read the documentation Fix list for z/OS XL C/C++ A complete listing of releases, refreshes, fix packs and interim fixes sorted by version for IBM z/OS XL C/C++ . Read the documentation Buy now and get started Contact us Expert resources to help you succeed Product documentation Find answers quickly in IBM product documentation. Support Learn more about product support options.