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 AArch64 Backend
78------------------------------
79
80* Introduced support for Armv9-A's Realm Management Extension.
81
82Changes to the ARM Backend
83--------------------------
84
85During this release ...
86
87Changes to the MIPS Target
88--------------------------
89
90During this release ...
91
92Changes to the Hexagon Target
93-----------------------------
94
95* The Hexagon target now supports V68/HVX ISA.
96
97Changes to the PowerPC Target
98-----------------------------
99
100During this release ...
101
102Changes to the X86 Target
103-------------------------
104
105During this release ...
106
107Changes to the AMDGPU Target
108-----------------------------
109
110During this release ...
111
112Changes to the AVR Target
113-----------------------------
114
115During this release ...
116
117Changes to the WebAssembly Target
118---------------------------------
119
120During this release ...
121
122Changes to the OCaml bindings
123-----------------------------
124
125
126Changes to the C API
127--------------------
128
129* The C API function ``LLVMIntrinsicCopyOverloadedName`` has been deprecated.
130  Please migrate to ``LLVMIntrinsicCopyOverloadedName2`` which takes an extra
131  module argument and which also handles unnamed types.
132  ('D99173' <https://reviews.llvm.org/D99173>'_)
133
134Changes to the Go bindings
135--------------------------
136
137
138Changes to the FastISel infrastructure
139--------------------------------------
140
141* FastISel no longer tracks killed registers, and instead leaves this to the
142  register allocator. This means that ``hasTrivialKill()`` is removed, as well
143  as the ``OpNIsKill`` parameters to the ``fastEmit_*()`` family of functions.
144
145Changes to the DAG infrastructure
146---------------------------------
147
148
149Changes to the Debug Info
150---------------------------------
151
152During this release ...
153
154Changes to the LLVM tools
155---------------------------------
156
157* The options ``--build-id-link-{dir,input,output}`` have been deleted.
158  (`D96310 <https://reviews.llvm.org/D96310>`_)
159
160* Support for in-order processors has been added to ``llvm-mca``.
161  (`D94928 <https://reviews.llvm.org/D94928>`_)
162
163* llvm-objdump supports ``-M {att,intel}`` now.
164  ``--x86-asm-syntax`` is a deprecated internal option which will be removed in LLVM 14.0.0.
165  (`D101695 <https://reviews.llvm.org/D101695>`_)
166
167* The llvm-readobj short aliases ``-s`` (previously ``--sections``) and ``-t``
168  (previously ``--syms``) have been changed to ``--syms`` and
169  ``--section-details`` respectively, to match llvm-readelf.
170  (`D105055 <https://reviews.llvm.org/D105055>`_)
171
172Changes to LLDB
173---------------------------------
174
175Changes to Sanitizers
176---------------------
177
178External Open Source Projects Using LLVM 13
179===========================================
180
181* A project...
182
183Additional Information
184======================
185
186A wide variety of additional information is available on the `LLVM web page
187<https://llvm.org/>`_, in particular in the `documentation
188<https://llvm.org/docs/>`_ section.  The web page also contains versions of the
189API documentation which is up-to-date with the Git version of the source
190code.  You can access versions of these documents specific to this release by
191going into the ``llvm/docs/`` directory in the LLVM tree.
192
193If you have any questions or comments about LLVM, please feel free to contact
194us via the `mailing lists <https://llvm.org/docs/#mailing-lists>`_.
195