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docs/ReleaseNotes.rst
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@ -1,12 +1,12 @@
========================
LLVM 7.0.0 Release Notes
LLVM 8.0.0 Release Notes
========================
.. contents::
:local:
.. warning::
These are in-progress notes for the upcoming LLVM 7 release.
These are in-progress notes for the upcoming LLVM 8 release.
Release notes for previous releases can be found on
`the Download Page <http://releases.llvm.org/download.html>`_.
@ -15,7 +15,7 @@ Introduction
============
This document contains the release notes for the LLVM Compiler Infrastructure,
release 7.0.0. Here we describe the status of LLVM, including major improvements
release 8.0.0. Here we describe the status of LLVM, including major improvements
from the previous release, improvements in various subprojects of LLVM, and
some of the current users of the code. All LLVM releases may be downloaded
from the `LLVM releases web site <http://llvm.org/releases/>`_.
@ -40,75 +40,6 @@ Non-comprehensive list of changes in this release
functionality, or simply have a lot to talk about), see the `NOTE` below
for adding a new subsection.
* Libraries have been renamed from 7.0 to 7. This change also impacts
downstream libraries like lldb.
* The LoopInstSimplify pass (-loop-instsimplify) has been removed.
* Symbols starting with ``?`` are no longer mangled by LLVM when using the
Windows ``x`` or ``w`` IR mangling schemes.
* A new tool named :doc:`llvm-exegesis <CommandGuide/llvm-exegesis>` has been
added. :program:`llvm-exegesis` automatically measures instruction scheduling
properties (latency/uops) and provides a principled way to edit scheduling
models.
* A new tool named :doc:`llvm-mca <CommandGuide/llvm-mca>` has been added.
:program:`llvm-mca` is a static performance analysis tool that uses
information available in LLVM to statically predict the performance of
machine code for a specific CPU.
* The optimization flag to merge constants (-fmerge-all-constants) is no longer
applied by default.
* Optimization of floating-point casts is improved. This may cause surprising
results for code that is relying on the undefined behavior of overflowing
casts. The optimization can be disabled by specifying a function attribute:
"strict-float-cast-overflow"="false". This attribute may be created by the
clang option :option:`-fno-strict-float-cast-overflow`.
Code sanitizers can be used to detect affected patterns. The option for
detecting this problem alone is "-fsanitize=float-cast-overflow":
.. code-block:: c
int main() {
float x = 4294967296.0f;
x = (float)((int)x);
printf("junk in the ftrunc: %f\n", x);
return 0;
}
.. code-block:: bash
clang -O1 ftrunc.c -fsanitize=float-cast-overflow ; ./a.out
ftrunc.c:5:15: runtime error: 4.29497e+09 is outside the range of representable values of type 'int'
junk in the ftrunc: 0.000000
* ``LLVM_ON_WIN32`` is no longer set by ``llvm/Config/config.h`` and
``llvm/Config/llvm-config.h``. If you used this macro, use the compiler-set
``_WIN32`` instead which is set exactly when ``LLVM_ON_WIN32`` used to be set.
* The ``DEBUG`` macro has been renamed to ``LLVM_DEBUG``, the interface remains
the same. If you used this macro you need to migrate to the new one.
You should also clang-format your code to make it easier to integrate future
changes locally. This can be done with the following bash commands:
.. code-block:: bash
git grep -l 'DEBUG' | xargs perl -pi -e 's/\bDEBUG\s?\(/LLVM_DEBUG(/g'
git diff -U0 master | ../clang/tools/clang-format/clang-format-diff.py -i -p1 -style LLVM
* Early support for UBsan, X-Ray instrumentation and libFuzzer (x86 and x86_64) for OpenBSD. Support for MSan
(x86_64), X-Ray instrumentation and libFuzzer (x86 and x86_64) for FreeBSD.
* ``SmallVector<T, 0>`` shrank from ``sizeof(void*) * 4 + sizeof(T)`` to
``sizeof(void*) + sizeof(unsigned) * 2``, smaller than ``std::vector<T>`` on
64-bit platforms. The maximum capacity is now restricted to ``UINT32_MAX``.
Since SmallVector doesn't have the exception-safety pessimizations some
implementations saddle std::vector with and is better at using ``realloc``,
it's now a better choice even on the heap (although when TinyPtrVector works,
it's even smaller).
* Note..
.. NOTE
@ -124,13 +55,6 @@ Non-comprehensive list of changes in this release
Changes to the LLVM IR
----------------------
* The signatures for the builtins @llvm.memcpy, @llvm.memmove, and @llvm.memset
have changed. Alignment is no longer an argument, and are instead conveyed as
parameter attributes.
* invariant.group.barrier has been renamed to launder.invariant.group.
* invariant.group metadata can now refer only empty metadata nodes.
Changes to the ARM Backend
--------------------------
@ -167,26 +91,16 @@ Changes to the AVR Target
Changes to the OCaml bindings
-----------------------------
* Remove ``add_bb_vectorize``.
Changes to the C API
--------------------
* Remove ``LLVMAddBBVectorizePass``. The implementation was removed and the C
interface was made a deprecated no-op in LLVM 5. Use
``LLVMAddSLPVectorizePass`` instead to get the supported SLP vectorizer.
Changes to the DAG infrastructure
---------------------------------
* ADDC/ADDE/SUBC/SUBE are now deprecated and will default to expand. Backends
that wish to continue to use these opcodes should explicitely request so
using ``setOperationAction`` in their ``TargetLowering``. New backends
should use UADDO/ADDCARRY/USUBO/SUBCARRY instead of the deprecated opcodes.
* The SETCCE opcode has now been removed in favor of SETCCCARRY.
External Open Source Projects Using LLVM 7
External Open Source Projects Using LLVM 8
==========================================
* A project...