These are in-progress notes for the upcoming LLVM 3.9 release. You may prefer the LLVM 3.8 Release Notes.
This document contains the release notes for the LLVM Compiler Infrastructure, release 3.9. Here we describe the status of LLVM, including major improvements from the previous release, improvements in various subprojects of LLVM, and some of the current users of the code. All LLVM releases may be downloaded from the LLVM releases web site.
For more information about LLVM, including information about the latest release, please check out the main LLVM web site. If you have questions or comments, the LLVM Developer’s Mailing List is a good place to send them.
Note that if you are reading this file from a Subversion checkout or the main LLVM web page, this document applies to the next release, not the current one. To see the release notes for a specific release, please see the releases page.
LLVM no longer does inter-procedural analysis and optimization (except inlining) on functions with comdat linkage. Doing IPO over such functions is unsound because the implementation the linker chooses at link-time may be differently optimized than the one what was visible during optimization, and may have arbitrarily different observable behavior. See PR26774 for more details.
Moved some optimizations from O3 to O2 (D18562)
An exciting aspect of LLVM is that it is used as an enabling technology for a lot of other language and tools projects. This section lists some of the projects that have already been updated to work with LLVM 3.9.
A wide variety of additional information is available on the LLVM web page, in particular in the documentation section. The web page also contains versions of the API documentation which is up-to-date with the Subversion version of the source code. You can access versions of these documents specific to this release by going into the llvm/docs/ directory in the LLVM tree.
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