1=========================
2LLVM 13.0.0 Release Notes
3=========================
4
5.. contents::
6    :local:
7
8.. warning::
9   These are in-progress notes for the upcoming LLVM 13 release.
10   Release notes for previous releases can be found on
11   `the Download Page <https://releases.llvm.org/download.html>`_.
12
13
14Introduction
15============
16
17This document contains the release notes for the LLVM Compiler Infrastructure,
18release 13.0.0.  Here we describe the status of LLVM, including major improvements
19from the previous release, improvements in various subprojects of LLVM, and
20some of the current users of the code.  All LLVM releases may be downloaded
21from the `LLVM releases web site <https://llvm.org/releases/>`_.
22
23For more information about LLVM, including information about the latest
24release, please check out the `main LLVM web site <https://llvm.org/>`_.  If you
25have questions or comments, the `LLVM Developer's Mailing List
26<https://lists.llvm.org/mailman/listinfo/llvm-dev>`_ is a good place to send
27them.
28
29Note that if you are reading this file from a Git checkout or the main
30LLVM web page, this document applies to the *next* release, not the current
31one.  To see the release notes for a specific release, please see the `releases
32page <https://llvm.org/releases/>`_.
33
34Non-comprehensive list of changes in this release
35=================================================
36.. NOTE
37   For small 1-3 sentence descriptions, just add an entry at the end of
38   this list. If your description won't fit comfortably in one bullet
39   point (e.g. maybe you would like to give an example of the
40   functionality, or simply have a lot to talk about), see the `NOTE` below
41   for adding a new subsection.
42
43
44.. NOTE
45   If you would like to document a larger change, then you can add a
46   subsection about it right here. You can copy the following boilerplate
47   and un-indent it (the indentation causes it to be inside this comment).
48
49   Special New Feature
50   -------------------
51
52   Makes programs 10x faster by doing Special New Thing.
53
54* Windows Control-flow Enforcement Technology: the ``-ehcontguard`` option now
55  emits valid unwind entrypoints which are validated when the context is being
56  set during exception handling.
57
58Changes to the LLVM IR
59----------------------
60
61* The ``inalloca`` attribute now has a mandatory type field, similar
62  to ``byval`` and ``sret``.
63
64* The opaque pointer type ``ptr`` has been introduced. It is still in the
65  process of being worked on and should not be used yet.
66
67Changes to building LLVM
68------------------------
69
70* The build system now supports building multiple distributions, so that you can
71  e.g. have one distribution containing just tools and another for libraries (to
72  enable development). See :ref:`Multi-distribution configurations` for details.
73
74Changes to TableGen
75-------------------
76
77Changes to the ARM Backend
78--------------------------
79
80During this release ...
81
82Changes to the MIPS Target
83--------------------------
84
85During this release ...
86
87Changes to the Hexagon Target
88-----------------------------
89
90* The Hexagon target now supports V68/HVX ISA.
91
92Changes to the PowerPC Target
93-----------------------------
94
95During this release ...
96
97Changes to the X86 Target
98-------------------------
99
100During this release ...
101
102Changes to the AMDGPU Target
103-----------------------------
104
105During this release ...
106
107Changes to the AVR Target
108-----------------------------
109
110During this release ...
111
112Changes to the WebAssembly Target
113---------------------------------
114
115During this release ...
116
117Changes to the OCaml bindings
118-----------------------------
119
120
121Changes to the C API
122--------------------
123
124* The C API function ``LLVMIntrinsicCopyOverloadedName`` has been deprecated.
125  Please migrate to ``LLVMIntrinsicCopyOverloadedName2`` which takes an extra
126  module argument and which also handles unnamed types.
127  ('D99173' <https://reviews.llvm.org/D99173>'_)
128
129Changes to the Go bindings
130--------------------------
131
132
133Changes to the FastISel infrastructure
134--------------------------------------
135
136* FastISel no longer tracks killed registers, and instead leaves this to the
137  register allocator. This means that ``hasTrivialKill()`` is removed, as well
138  as the ``OpNIsKill`` parameters to the ``fastEmit_*()`` family of functions.
139
140Changes to the DAG infrastructure
141---------------------------------
142
143
144Changes to the Debug Info
145---------------------------------
146
147During this release ...
148
149Changes to the LLVM tools
150---------------------------------
151
152* The options ``--build-id-link-{dir,input,output}`` have been deleted.
153  (`D96310 <https://reviews.llvm.org/D96310>`_)
154
155* Support for in-order processors has been added to ``llvm-mca``.
156  (`D94928 <https://reviews.llvm.org/D94928>`_)
157
158* llvm-objdump supports ``-M {att,intel}`` now.
159  ``--x86-asm-syntax`` is a deprecated internal option which will be removed in LLVM 14.0.0.
160  (`D101695 <https://reviews.llvm.org/D101695>`_)
161
162Changes to LLDB
163---------------------------------
164
165Changes to Sanitizers
166---------------------
167
168External Open Source Projects Using LLVM 13
169===========================================
170
171* A project...
172
173Additional Information
174======================
175
176A wide variety of additional information is available on the `LLVM web page
177<https://llvm.org/>`_, in particular in the `documentation
178<https://llvm.org/docs/>`_ section.  The web page also contains versions of the
179API documentation which is up-to-date with the Git version of the source
180code.  You can access versions of these documents specific to this release by
181going into the ``llvm/docs/`` directory in the LLVM tree.
182
183If you have any questions or comments about LLVM, please feel free to contact
184us via the `mailing lists <https://llvm.org/docs/#mailing-lists>`_.
185