[llvm-announce] LLVM 3.4 Release!

Chris Lattner
2014-01-06T15:30:01Z

LLVM 3.4 is now available! Download it now, or read the release notes.

This is a big new release with a lot of features.  Clang now supports all of the
features in the current working draft of the upcoming C++ standard,
provisionally named C++1y.  The static analyzer has greatly improved C++
support, produces fewer false positives and catches more bugs.  Clang also
includes a few new capabilities: 1) a tool called "clang-format" which
can be used in an IDE or text editor to auto-format your code according to
builtin styles, and 2) a new (experimental!) driver designed for drop-in
compatibility with Visual Studio on Windows.

In the code generator, overall performance is greatly increased.  Notably, the
loop auto-vectorizer is now enabled at -Os and -O2 in addition to -O3 (with
appropriately tuned heuristics for each level).  The SLP ("straight-line
code") auto-vectorizer is now enabled by default as well.  Many targets
have made major leaps, but the R600 target is now built by default (instead of
experimental), the PowerPC backend has made several major improvements to code
generation quality and compile time, and the X86, SPARC, ARM32, Aarch64 and
SystemZ backends have all seen major feature work.

In addition to all of the improvements, there is one notable change: clang -O4
now no longer implicitly enables link-time optimization.  LTO continues to be
available with the -flto flag, and can be enabled at any optimization level.  To
get the previous -O4 behavior, simply use "clang -O3 -flto".  In
addition, LLVM 3.4 will be the last release that will build with a plain
C++'98 compiler.  Future releases will require some C++'11 support in
the host compiler to build.

LLVM 3.4 is the result of an incredible number of people working together over
the last six months, but this release would not be possible without our
volunteer release team!  Thanks to Bill Wendling for making it all possible by
shepherding the release, and to the awesome release testers: Arnaud A. de
Grandmaison, Ben Pope, Dimitry Andric, Duncan Sands, Erik Verbruggen, Hans
Wennborg, Nikola Smiljanic, Paweł Worach, Rafael Espíndola, Renato Golin,
Sebastian Dreßler, Sylvestre Ledru, and Tom Stellard.

If you have questions or comments about this release, please contact the LLVMdev
mailing list! Onward to LLVM 3.5!

-Chris

LLVM 3.3 Release Announcement:
http://lists.cs.uiuc.edu/pipermail/llvm-announce/2013-June/000046.html
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