* Adds dialect registration, hand coded 'encoding' attribute and test.
* An MLIR CAPI tablegen backend for attributes does not exist, and this is a relatively complicated case. I opted to hand code it in a canonical way for now, which will provide a reasonable blueprint for building out the tablegen version in the future.
* Also added a (local) CMake function for declaring new CAPI tests, since it was getting repetitive/buggy.

Differential Revision: https://reviews.llvm.org/D102141

[X86][SSE] Add examples of failures to remove a permute(pack(pack(),pack())) shuffle by reordering the packed operands.

We were incorrectly calling getVectorNumElements on a scalable
vector type. This shouldn't be allowed. This gives a warning on
EVT, but not MVT.

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D102142

-fno-semantic-interposition (only effective with -fpic) can optimize default
visibility external linkage (non-ifunc-non-COMDAT) variable access and function
calls to avoid GOT/PLT, by using local aliases, e.g.
```
int var;
__attribute__((optnone)) int fun(int x) { return x * x; }
int test() { return fun(var); }
```

-fpic (var and fun are dso_preemptable)
```
test:                                   // @test
        adrp    x8, :got:var
        ldr     x8, [x8, :got_lo12:var]
        ldr     w0, [x8]
// fun is preemptible by default in ld -shared mode. ld will create a PLT.
        b       fun
```

vs -fpic -fno-semantic-interposition (var and fun are dso_local)
```
test:                                   // @test
.Ltest$local:
        adrp    x8, .Lvar$local
        ldr     w0, [x8, :lo12:.Lvar$local]
// The assembler either resolves .Lfun$local at assembly time, or produces a
// relocation referencing a non-preemptible section symbol (which ca...

The nm command guide shows the short options used as aliases but these
are not found in the help text unless --show-hidden is used, other tools
show aliases with --help. This change fixes the help output to be
consistent with the command guide.

Differential Revision: https://reviews.llvm.org/D102072

The option --use-symbol-table is now a noop and does not appear in the
help text, however it still appears in the command guide. This change
removes it from the command guide and updates the description of
--output-style .

Differential Revision: https://reviews.llvm.org/D102078

This adds a separator between two pieces of information.

Reviewed By: #lld-macho, alexshap

Differential Revision: https://reviews.llvm.org/D102114

Reviewed By: #libc, Quuxplusone

Differential Revision: https://reviews.llvm.org/D102133

The logic for x86_64 position-independent TType encodings was backwards,
using 8 bytes where 4 were wanted and 4 where 8 were wanted. For regular
x86_64, this was mostly harmless, exception tables are allowed to use
8-byte encodings even when it is not needed. For the large code model,
and for X32, however, the generated exception tables were wrong. For the
large code model, we cannot assume that the address will fit in 4 bytes.
For X32, we cannot use 64-bit relocations.

Fixes PR50148.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D102132

Differential Revision: https://reviews.llvm.org/D102164

Analogously to https://reviews.llvm.org/D98794 this patch uses the
`alignstack` attribute to fix incorrect passing of homogeneous
aggregate (HA) arguments on AArch32. The EABI/AAPCS was recently
updated to clarify how VFP co-processor candidates are aligned:
https://github.com/ARM-software/abi-aa/commit/4488e34998514dc7af5507236f279f6881eede62

Differential Revision: https://reviews.llvm.org/D100853

This reverts commit fefcb1f8.
It was supposed to be NFC, but as noted in the post-commit
comments in D102002, that was not true: SimplifyCFG uses
different parameters and there's a difference in an
extension point / callback.

[libomptarget] Add support for target allocators to dynamic cuda RTL

Follow on to D102000 which introduced new calls into libcuda. This patch adds
the corresponding entry points to dynamic_cuda, fixing the build for systems
that do not have the cuda toolkit installed.

Function types and enum from https://docs.nvidia.com/cuda/cuda-driver-api/group__CUDA__MEM.html

Reviewed By: pdhaliwal

Differential Revision: https://reviews.llvm.org/D102169

Correctly emit `vins`instructions that are safe in 32bit mode.

Reviewed By: nemanjai, #powerpc

Differential Revision: https://reviews.llvm.org/D101383

Need to remove the old code for avoiding double counting of the gather
nodes with perfect diamond matches within the tree after we started
detecting perfect/shuffled matching in the previous patch D100495. We
may skip the cost for such nodes completely.

Differential Revision: https://reviews.llvm.org/D102023

The aim is to define _LIBCPP_ELAST for AIX since strerror/strerror_r
can't handle out-of-range errno values.

Differential Revision: https://reviews.llvm.org/D100986

Expanding a fixed length operation involves wrapping the operation in an
insert/extract subvector pair, as such, when this is done to bitcast we
end up with an extract_subvector of a bitcast. DAGCombine tries to
convert this into a bitcast of an extract_subvector which restores the
initial fixed length bitcast, causing an infinite loop of legalization.

As part of this patch, we must make sure the above DAGCombine does not
trigger after legalization if the created bitcast would not be legal.

Differential Revision: https://reviews.llvm.org/D101990

Follow the more general patch for now, do not try to SPMDize the kernel
if the variable is used and local.

Differential Revision: https://reviews.llvm.org/D101911

Since calling `PrintFatalError` will automatically add `error: `
prefix in the message printed, there is no need having an extra
`ERROR:` prefix in the argument passed.

Differential Revision: https://reviews.llvm.org/D102151
Reviewed By: Paul-C-Anagnostopoulos

X86FlagsCopyLowering.cpp - try to pass DebugLoc by const-ref to avoid costly TrackingMDNodeRef copies. NFCI.

X86LoadValueInjectionLoadHardening.cpp - use const-reference in for-range loops to avoid unnecessary copies. NFCI.

A ConstantAggregateZero may be created from a scalable vector type.
However, it still assumed fixed number of elements when queried for
them. This patch changes ConstantAggregateZero to correctly report its
element count.

This change fixes a couple of issues. Firstly, it fixes a crash in
Constant::getUniqueValue when called on a scalable-vector
zeroinitializer constant.

Secondly, it fixes a latent bug in GlobalISel's IRTranslator in which
translating a scalable-vector zeroinitializer would hit the assertion in
ConstantAggregateZero::getNumElements when casting to a FixedVectorType,
rather than reporting an error more gracefully. This is currently
hypothetical as the IRTranslator has deeper issues preventing the use of
scalable vector types.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D102082

According to the specification, this should be an unsigned integer.

Reviewed By: sammccall

Differential Revision: https://reviews.llvm.org/D101616

This is preparation for the https://reviews.llvm.org/D101025.
The D101025 will start calculating var locstats for concrete fns
that refere to an abstract origin as well.

We might release a new version at some point after all.
In fact, use the same pattern the other CHECK lines in this test
use, for consistency.

When using predicated intrinsics, if the predicate used is all lanes active,
use an unpredicated form of the instruction, additionally this allows for
better use of immediate forms.

This only includes instructions where the unpredicated/predicated forms
matched in such a way that instruction selection would not introduce extra
ptrue instructions. This allows us to convert the intrinsics directly to
architecture independent ISD nodes.

Depends on D101062

Differential Revision: https://reviews.llvm.org/D101828

When using predicated arithmetic intrinsics, if the predicate used is all
lanes active, use an unpredicated form of the instruction, additionally
this allows for better use of immediate forms.

This also includes a new complex isel pattern which allows matching an
all active predicate when the types are different but the predicate is a
superset of the type being used. For example, to allow a b8 ptrue for a
b32 predicate operand.

This only includes instructions where the unpredicated/predicated forms
are mismatched between variants, meaning that the removal of the
predicate is done during instruction selection in order to prevent
spurious re-introductions of ptrue instructions.

Co-authored-by: Paul Walker <paul.walker@arm.com>

Differential Revision: https://reviews.llvm.org/D101062

The function template `CallLowering::setArgFlags` is invoked both
for arguments and return values. In the latter case, it calls
`getParamStackAlign` with argument index `~0u`. Nothing wrong
happens now, as the argument is safely incremented back to 0
inside `getParamStackAlign` (the type is `unsigned`), but in
principle it's fragile and may become incorrect.

Differential Revision: https://reviews.llvm.org/D102004

DAGCombiner tries to combine a (fpext (load)) to (fround (extload))
but SVE has no FP-extending loads. By marking these as expand,
the combine no longer happens.

This also fixes a similar issue for fptrunc, where the source type
is not a legal type.

Reviewed By: bsmith, kmclaughlin

Differential Revision: https://reviews.llvm.org/D102053

Silences MSVC warning.

This fixes a crash caused by Lexers being invalidated at code
completion points in
https://github.com/llvm/llvm-project/blob/main/clang/lib/Lex/PPLexerChange.cpp#L520.

Differential Revision: https://reviews.llvm.org/D102069

When using parallel loop construct, the OpenMP specification allows for
guided, auto and runtime as scheduling variants (as well as static and
dynamic which are already supported).

This adds the translation from MLIR to LLVM-IR for these scheduling
variants.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D101435

In the buffer deallocation pass, unranked memref types are not properly supported.
After investigating this issue, it turns out that the Clone and Dealloc operation
does not support unranked memref types in the current implementation.
This patch adds the missing feature and enables the transformation of any memref
type.

This patch solves this bug: https://bugs.llvm.org/show_bug.cgi?id=48385

Differential Revision: https://reviews.llvm.org/D101760

According to:
https://docs.python.org/3/library/subprocess.html#subprocess.Popen.poll

poll can return None if the process hasn't terminated.

I'm not quite sure how addr2line could end up closing the pipe without
terminating but we did see this happen on one of our bots:
```
<...>scripts/asan_symbolize.py",
line 211, in symbolize
    logging.debug("addr2line exited early (broken pipe), returncode=%d"
% self.pipe.poll())
TypeError: %d format: a number is required, not NoneType
```

Handle None by printing a message that we couldn't get the return
code.

Reviewed By: delcypher

Differential Revision: https://reviews.llvm.org/D101891

As a canonicalization, infer the resulting shape rank if possible.

Differential Revision: https://reviews.llvm.org/D102068

This is a follow up on D101524 which:
 - simplifies cpu features detection and usage,
 - flattens target dependent optimizations so it's obvious which implementations are generated,
 - provides an implementation targeting the host (march/mtune=native) for the mem* functions,
 - makes sure all implementations are unittested (provided the host can run them),
 - makes sure all implementations are benchmarkable (provided the host can run them).

Differential Revision: https://reviews.llvm.org/D101895