This differentiates the Ryzen 4000/4300/4500/4700 series APUs that were
previously included in gfx909.
Differential Revision: https://reviews.llvm.org/D90419
Change-Id: Ia901a7157eb2f73ccd9f25dbacec38427312377d
This has already been done by @rjmccall in D76526 (49e5a97ec363), and
9514c048d89e. We should remove this from the docs.
Differential Revision: https://reviews.llvm.org/D90550
Only the aliases 'xzr' and 'sp' exist for the physical register x31.
The reason for wanting to remove the alias 'x31' is because it allows users
to write invalid asm that is not accepted by the GNU assembler.
Is there any objection to removing this alias? Or do we want to keep
this for compatibility with existing code that uses w31/x31?
Differential Revision: https://reviews.llvm.org/D90153
This patch mainly made the following changes:
1. Support AVX-VNNI instructions;
2. Introduce ExplicitVEXPrefix flag so that vpdpbusd/vpdpbusds/vpdpbusds/vpdpbusds instructions only use vex-encoding when user explicity add {vex} prefix.
Differential Revision: https://reviews.llvm.org/D89105
Make all of the "AMDGPU Machine Code GFX*" columns in the Memory Model
table a consistent width of 32-characters.
Best viewed with something like --word-diff
Differential Revision: https://reviews.llvm.org/D89977
Mostly NFC, but some changes are "bug fixes" rather than just e.g.
formatting changes or typo corrections.
- Fix typo "competing" -> "completing".
- Document why waintcnt is added to stores and not loads for
sequentially consistent ordering.
- Lowercase some mentions of `buffer_gl{0,1}_inv`.
- Make mentions of `*cnt(0)` consistently include the `(0)` count.
- Remove some mentions of instructions for incorrect address spaces. For
example, remove mention of `flat_load` from
`load atomic acquire workgroup global`.
- Re-flow some text to get all the target columns to fit in a
32-character wide column. Makes a future NFC patch to make these columns
both 32-character wide more straightforward.
Modified cherry-pick of patch by Tony Tye
Reviewed By: t-tye
Differential Revision: https://reviews.llvm.org/D89596
The neutral value is -0.0, not 0.0. This doesn't matter for "fast"
reductions due to nsz, but does matter for reassoc-only and seq
reductions.
Change tests to mostly use -0.0 where the neutral value was intended,
and add some additional test coverage in some places. Also update
LangRef to use the right value.
- AMDGPUUsage.rst: Correct AMD GPU DWARF address space table address
sizes which are in bits and not bytes.
- clang/.../Options.td: Improve description of AMD GPU options.
- Re-generate ClangComamndLineReference.rst from clang/.../Options.td .
Differential Revision: https://reviews.llvm.org/D90364
Add a few cross-references among TableGen documents.
Differential Revision: https://reviews.llvm.org/D90186
Add cross-references between TableGen documents.
If `null_pointer_is_valid` is present, `dereferenceable` does not imply
`nonnull`, make it clear.
Came up in D17993.
Reviewed By: aqjune
Differential Revision: https://reviews.llvm.org/D89417
--section-details/-t is a GNU readelf option that produce
an output that is an alternative to --sections.
Differential revision: https://reviews.llvm.org/D89304
Allow overriding the default set of flags used to enable UBSan when
building llvm.
This can be used to test new checks or opt out of certain checks.
Differential Revision: https://reviews.llvm.org/D89439
This change introduces a GC parseable lowering for element atomic
memcpy/memmove intrinsics. This way runtime can provide an
implementation which can take a safepoint during copy operation.
See "GC-parseable element atomic memcpy/memmove" thread on llvm-dev
for the background and details:
https://groups.google.com/g/llvm-dev/c/NnENHzmX-b8/m/3PyN8Y2pCAAJ
Differential Revision: https://reviews.llvm.org/D88861
It's currently ambiguous in IR whether the source language explicitly
did not want a stack a stack protector (in C, via function attribute
no_stack_protector) or doesn't care for any given function.
It's common for code that manipulates the stack via inline assembly or
that has to set up its own stack canary (such as the Linux kernel) would
like to avoid stack protectors in certain functions. In this case, we've
been bitten by numerous bugs where a callee with a stack protector is
inlined into an __attribute__((__no_stack_protector__)) caller, which
generally breaks the caller's assumptions about not having a stack
protector. LTO exacerbates the issue.
While developers can avoid this by putting all no_stack_protector
functions in one translation unit together and compiling those with
-fno-stack-protector, it's generally not very ergonomic or as
ergonomic as a function attribute, and still doesn't work for LTO. See also:
https://lore.kernel.org/linux-pm/20200915172658.1432732-1-rkir@google.com/https://lore.kernel.org/lkml/20200918201436.2932360-30-samitolvanen@google.com/T/#u
Typically, when inlining a callee into a caller, the caller will be
upgraded in its level of stack protection (see adjustCallerSSPLevel()).
By adding an explicit attribute in the IR when the function attribute is
used in the source language, we can now identify such cases and prevent
inlining. Block inlining when the callee and caller differ in the case that one
contains `nossp` when the other has `ssp`, `sspstrong`, or `sspreq`.
Fixes pr/47479.
Reviewed By: void
Differential Revision: https://reviews.llvm.org/D87956
In preparation for potential future concurrency, a FunctionPass
shouldn't modify anything at the module level that other FunctionPasses
can also modify.
Reviewed By: asbirlea
Differential Revision: https://reviews.llvm.org/D89890
Recently [1], there was an upgrade to the version of buildbot being
deployed. The new setup will still work with old buildslaves but I
thought it might be a good idea to update the documentation to reflect,
that you now can use a newer buildbot version to when setting up your
worker (formely known as slave).
The upgrade from buildbot 0.8.5 to 2.8.5 went a long with a transition
to a new "worker" terminology [2] which is also reflected by this
change.
[1]: http://lists.llvm.org/pipermail/llvm-dev/2020-October/145629.html
[2]: http://docs.buildbot.net/0.9.12/manual/worker-transition.html
Reviewed By: gkistanova
Differential Revision: https://reviews.llvm.org/D89230
LLVM IR currently assumes some form of forward progress. This form is
not explicitly defined anywhere, and is the cause of miscompilations
in most languages that are not C++11 or later. This implicit forward progress
guarantee can not be opted out of on a function level nor on a loop
level. Languages such as C (C11 and later), C++ (pre-C++11), and Rust
have different forward progress requirements and this needs to be
evident in the IR.
Specifically, C11 and onwards (6.8.5, Paragraph 6) states that "An
iteration statement whose controlling expression is not a constant
expression, that performs no input/output operations, does not access
volatile objects, and performs no synchronization or atomic operations
in its body, controlling expression, or (in the case of for statement)
its expression-3, may be assumed by the implementation to terminate."
C++11 and onwards does not have this assumption, and instead assumes
that every thread must make progress as defined in [intro.progress] when
it comes to scheduling.
This was initially brought up in [0] as a bug, a solution was presented
in [1] which is the current workaround, and the predecessor to this
change was [2].
After defining a notion of forward progress for IR, there are two
options to address this:
1) Set the default to assuming Forward Progress and provide an opt-out for functions and an opt-in for loops.
2) Set the default to not assuming Forward Progress and provide an opt-in for functions, and an opt-in for loops.
Option 2) has been selected because only C++11 and onwards have a
forward progress requirement and it makes sense for them to opt-into it
via the defined `mustprogress` function attribute. The `mustprogress`
function attribute indicates that the function is required to make
forward progress as defined. This is sharply in contrast to the status
quo where this is implicitly assumed. In addition, `willreturn` implies `mustprogress`.
The background for why this definition was chosen is in [3] and for why
the option was chosen is in [4] and the corresponding thread(s). The implementation is in D85393, the
clang patch is in D86841, the LoopDeletion patch is in D86844, the
Inliner patches are in D87180 and D87262, and there will be more
incoming.
[0] https://bugs.llvm.org/show_bug.cgi?id=965#c25
[1] https://lists.llvm.org/pipermail/llvm-dev/2017-October/118558.html
[2] https://reviews.llvm.org/D65718
[3] https://lists.llvm.org/pipermail/llvm-dev/2020-September/144919.html
[4] https://lists.llvm.org/pipermail/llvm-dev/2020-September/145023.html
Reviewed By: jdoerfert, efriedma, nikic
Differential Revision: https://reviews.llvm.org/D86233
The langref description for llvm.test.set.loop.iterations.* were
missing the i1 return type.
Differential Revision: https://reviews.llvm.org/D89564
Patch by: Janek van Oirschot
This patch updates the Kaleidoscope and BuildingAJIT tutorial series (chapter
1-4) to OrcV2. Chapter 5 of the BuildingAJIT series is removed -- it will be
re-instated once we have in-tree support for out-of-process JITing.
This patch only updates the tutorial code, not the text. Patches welcome for
that, otherwise I will try to update it in a few weeks.
This patch adds metadata !noundef and makes load instructions can optionally have it.
A load with !noundef always return a well-defined value (has no undef bit or isn't poison).
If the loaded value isn't well defined, the behavior is undefined.
This metadata can be used to encode the assumption from C/C++ that certain reads of variables should have well-defined values.
It is helpful for optimizing freeze instructions away, because freeze can be removed when its operand has well-defined value, and showing that a load from arbitrary location is well-defined is usually hard otherwise.
The same information can be encoded with llvm.assume with operand bundle; using metadata is chosen because I wasn't sure whether code motion can be freely done when llvm.assume is inserted from clang instead.
The existing codebase already is stripping unknown metadata when doing code motion, so using metadata is UB-safe as well.
Reviewed By: jdoerfert
Differential Revision: https://reviews.llvm.org/D89050
LLVM rejects DWARF operator DW_OP_over. This DWARF operator is needed
for Flang to support assumed rank array.
Summary:
Currently LLVM rejects DWARF operator DW_OP_over. Below error is
produced when llvm finds this operator.
[..]
invalid expression
!DIExpression(151, 20, 16, 48, 30, 35, 80, 34, 6)
warning: ignoring invalid debug info in over.ll
[..]
There were some parts missing in support of this operator, which are
now completed.
Testing
-added a unit testcase
-check-debuginfo
-check-llvm
Reviewed By: aprantl
Differential Revision: https://reviews.llvm.org/D89208
