2016-07-18 18:02:23 +00:00
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2019-01-16 10:57:02 +00:00
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LLVM 9.0.0 Release Notes
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2016-07-18 18:02:23 +00:00
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========================
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2012-12-09 23:14:26 +00:00
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.. contents::
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:local:
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2013-01-20 03:29:50 +00:00
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.. warning::
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2019-01-16 10:57:02 +00:00
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These are in-progress notes for the upcoming LLVM 9 release.
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2017-02-09 23:03:34 +00:00
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Release notes for previous releases can be found on
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2018-09-10 08:50:31 +00:00
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`the Download Page <https://releases.llvm.org/download.html>`_.
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2012-12-09 23:14:26 +00:00
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Introduction
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============
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This document contains the release notes for the LLVM Compiler Infrastructure,
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release 9.0.0. Here we describe the status of LLVM, including major improvements
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from the previous release, improvements in various subprojects of LLVM, and
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some of the current users of the code. All LLVM releases may be downloaded
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from the `LLVM releases web site <https://llvm.org/releases/>`_.
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For more information about LLVM, including information about the latest
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release, please check out the `main LLVM web site <https://llvm.org/>`_. If you
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2012-12-09 23:14:26 +00:00
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have questions or comments, the `LLVM Developer's Mailing List
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<https://lists.llvm.org/mailman/listinfo/llvm-dev>`_ is a good place to send
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them.
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Note that if you are reading this file from a Subversion checkout or the main
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LLVM web page, this document applies to the *next* release, not the current
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one. To see the release notes for a specific release, please see the `releases
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page <https://llvm.org/releases/>`_.
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2012-12-09 23:14:26 +00:00
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2013-01-20 03:29:50 +00:00
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Non-comprehensive list of changes in this release
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=================================================
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.. NOTE
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For small 1-3 sentence descriptions, just add an entry at the end of
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this list. If your description won't fit comfortably in one bullet
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point (e.g. maybe you would like to give an example of the
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functionality, or simply have a lot to talk about), see the `NOTE` below
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for adding a new subsection.
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2019-04-23 13:46:18 +00:00
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* The optimizer will now convert calls to ``memcmp`` into a calls to ``bcmp`` in
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some circumstances. Users who are building freestanding code (not depending on
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the platform's libc) without specifying ``-ffreestanding`` may need to either
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pass ``-fno-builtin-bcmp``, or provide a ``bcmp`` function.
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[SelectionDAG] Allow the user to specify a memeq function.
Summary:
Right now, when we encounter a string equality check,
e.g. `if (memcmp(a, b, s) == 0)`, we try to expand to a comparison if `s` is a
small compile-time constant, and fall back on calling `memcmp()` else.
This is sub-optimal because memcmp has to compute much more than
equality.
This patch replaces `memcmp(a, b, s) == 0` by `bcmp(a, b, s) == 0` on platforms
that support `bcmp`.
`bcmp` can be made much more efficient than `memcmp` because equality
compare is trivially parallel while lexicographic ordering has a chain
dependency.
Subscribers: fedor.sergeev, jyknight, ckennelly, gchatelet, llvm-commits
Differential Revision: https://reviews.llvm.org/D56593
llvm-svn: 355672
2019-03-08 09:07:45 +00:00
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2013-01-20 03:29:50 +00:00
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.. NOTE
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If you would like to document a larger change, then you can add a
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subsection about it right here. You can copy the following boilerplate
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and un-indent it (the indentation causes it to be inside this comment).
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2013-01-20 03:29:50 +00:00
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Special New Feature
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-------------------
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2013-01-20 03:29:50 +00:00
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Makes programs 10x faster by doing Special New Thing.
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2016-03-29 06:55:56 +00:00
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Changes to the LLVM IR
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----------------------
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2019-03-12 21:02:54 +00:00
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* Added ``immarg`` parameter attribute. This indicates an intrinsic
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parameter is required to be a simple constant. This annotation must
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be accurate to avoid possible miscompiles.
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2019-05-15 02:35:32 +00:00
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* The 2-field form of global variables ``@llvm.global_ctors`` and
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``@llvm.global_dtors`` has been deleted. The third field of their element
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type is now mandatory. Specify `i8* null` to migrate from the obsoleted
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2-field form.
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2018-05-18 23:53:46 +00:00
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2014-03-18 10:16:15 +00:00
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Changes to the ARM Backend
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--------------------------
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2014-08-22 21:57:38 +00:00
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During this release ...
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2014-03-18 10:16:15 +00:00
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2014-07-23 12:59:26 +00:00
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Changes to the MIPS Target
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--------------------------
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2015-01-14 18:07:30 +00:00
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During this release ...
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2015-01-11 10:34:52 +00:00
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2014-07-23 12:59:26 +00:00
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2014-07-31 14:38:17 +00:00
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Changes to the PowerPC Target
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2014-07-31 15:20:30 +00:00
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-----------------------------
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2014-07-31 14:38:17 +00:00
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2016-07-18 18:02:23 +00:00
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During this release ...
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2014-07-31 14:38:17 +00:00
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2015-12-21 02:37:23 +00:00
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Changes to the X86 Target
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2016-03-29 06:55:56 +00:00
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-------------------------
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2015-12-21 02:37:23 +00:00
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2019-01-16 10:57:02 +00:00
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During this release ...
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2015-12-21 02:37:23 +00:00
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2016-01-26 04:29:15 +00:00
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Changes to the AMDGPU Target
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-----------------------------
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2016-07-18 18:02:23 +00:00
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During this release ...
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2015-12-21 02:37:23 +00:00
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2016-11-17 22:26:09 +00:00
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Changes to the AVR Target
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-----------------------------
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2017-01-12 21:50:22 +00:00
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During this release ...
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2016-11-17 22:26:09 +00:00
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2019-01-14 18:20:30 +00:00
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Changes to the WebAssembly Target
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---------------------------------
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2019-01-16 10:57:02 +00:00
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During this release ...
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2019-01-15 17:54:42 +00:00
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2019-01-14 18:20:30 +00:00
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2015-01-13 09:48:02 +00:00
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Changes to the OCaml bindings
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-----------------------------
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2016-02-17 19:35:47 +00:00
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2017-06-30 01:17:45 +00:00
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Changes to the C API
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--------------------
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2017-06-30 07:09:08 +00:00
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Set ADDE/ADDC/SUBE/SUBC to expand by default
Summary:
They've been deprecated in favor of UADDO/ADDCARRY or USUBO/SUBCARRY for a while.
Target that uses these opcodes are changed in order to ensure their behavior doesn't change.
Reviewers: efriedma, craig.topper, dblaikie, bkramer
Subscribers: jholewinski, arsenm, jyknight, sdardis, nemanjai, nhaehnle, kbarton, fedor.sergeev, asb, rbar, johnrusso, simoncook, jordy.potman.lists, apazos, sabuasal, niosHD, jrtc27, zzheng, edward-jones, mgrang, atanasyan, llvm-commits
Differential Revision: https://reviews.llvm.org/D47422
llvm-svn: 333748
2018-06-01 13:21:33 +00:00
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Changes to the DAG infrastructure
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---------------------------------
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2018-06-04 18:36:22 +00:00
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External Open Source Projects Using LLVM 9
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==========================================
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2016-07-18 18:02:23 +00:00
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* A project...
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2013-11-14 05:57:40 +00:00
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2012-12-09 23:14:26 +00:00
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Additional Information
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======================
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A wide variety of additional information is available on the `LLVM web page
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2018-09-10 08:50:31 +00:00
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<https://llvm.org/>`_, in particular in the `documentation
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<https://llvm.org/docs/>`_ section. The web page also contains versions of the
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API documentation which is up-to-date with the Subversion version of the source
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code. You can access versions of these documents specific to this release by
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going into the ``llvm/docs/`` directory in the LLVM tree.
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If you have any questions or comments about LLVM, please feel free to contact
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2018-09-10 08:50:31 +00:00
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us via the `mailing lists <https://llvm.org/docs/#mailing-lists>`_.
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