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
65Changes to building LLVM
66------------------------
67
68Changes to TableGen
69-------------------
70
71Changes to the ARM Backend
72--------------------------
73
74During this release ...
75
76Changes to the MIPS Target
77--------------------------
78
79During this release ...
80
81
82Changes to the PowerPC Target
83-----------------------------
84
85During this release ...
86
87Changes to the X86 Target
88-------------------------
89
90During this release ...
91
92Changes to the AMDGPU Target
93-----------------------------
94
95During this release ...
96
97Changes to the AVR Target
98-----------------------------
99
100During this release ...
101
102Changes to the WebAssembly Target
103---------------------------------
104
105During this release ...
106
107Changes to the OCaml bindings
108-----------------------------
109
110
111Changes to the C API
112--------------------
113
114
115Changes to the Go bindings
116--------------------------
117
118
119Changes to the FastISel infrastructure
120--------------------------------------
121
122* FastISel no longer tracks killed registers, and instead leaves this to the
123  register allocator. This means that ``hasTrivialKill()`` is removed, as well
124  as the ``OpNIsKill`` parameters to the ``fastEmit_*()`` family of functions.
125
126Changes to the DAG infrastructure
127---------------------------------
128
129
130Changes to the Debug Info
131---------------------------------
132
133During this release ...
134
135Changes to the LLVM tools
136---------------------------------
137
138* The options ``--build-id-link-{dir,input,output}`` have been deleted.
139  (`D96310 <https://reviews.llvm.org/D96310>`_)
140
141* Support for in-order processors has been added to ``llvm-mca``.
142  (`D94928 <https://reviews.llvm.org/D94928>`_)
143
144Changes to LLDB
145---------------------------------
146
147Changes to Sanitizers
148---------------------
149
150External Open Source Projects Using LLVM 13
151===========================================
152
153* A project...
154
155Additional Information
156======================
157
158A wide variety of additional information is available on the `LLVM web page
159<https://llvm.org/>`_, in particular in the `documentation
160<https://llvm.org/docs/>`_ section.  The web page also contains versions of the
161API documentation which is up-to-date with the Git version of the source
162code.  You can access versions of these documents specific to this release by
163going into the ``llvm/docs/`` directory in the LLVM tree.
164
165If you have any questions or comments about LLVM, please feel free to contact
166us via the `mailing lists <https://llvm.org/docs/#mailing-lists>`_.
167