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LLVM 3.4 Release Notes

Warning

These are in-progress notes for the upcoming LLVM 3.4 release. You may prefer the LLVM 3.3 Release Notes.

Introduction

This document contains the release notes for the LLVM Compiler Infrastructure, release 3.4. 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.

Non-comprehensive list of changes in this release

  • The regression tests now fail if any command in a pipe fails. To disable it in a directory, just add config.pipefail = False to its lit.local.cfg. See :doc:`Lit <CommandGuide/lit>` for the details.
  • Support for exception handling has been removed from the old JIT. Use MCJIT if you need EH support.
  • The R600 backend is not marked experimental anymore and is built by default.
  • APFloat::isNormal() was renamed to APFloat::isFiniteNonZero() and APFloat::isIEEENormal() was renamed to APFloat::isNormal(). This ensures that APFloat::isNormal() conforms to IEEE-754R-2008.
  • The library call simplification pass has been removed. Its functionality has been integrated into the instruction combiner and function attribute marking passes.
  • Support for building using Visual Studio 2008 has been dropped. Use VS 2010 or later instead. For more information, see the Getting Started using Visual Studio page.
  • The Loop Vectorizer that was previously enabled for -O3 is now enabled for -Os and -O2.
  • The new SLP Vectorizer is now enabled by default.
  • llvm-ar now uses the new Object library and produces archives and symbol tables in the gnu format.
  • ... next change ...

External Open Source Projects Using LLVM 3.4

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 3.4.

Additional Information

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.

If you have any questions or comments about LLVM, please feel free to contact us via the mailing lists.