[llvm-readobj][ARM] - Improve support of printing unwind (-u) information for non-relocatable objects.

This is the one more patch for https://bugs.llvm.org/show_bug.cgi?id=47581

It fixes how we print an information for the Generic model. With this patch
we are able to read values from `.ARM.extab` and dump proper personality routines names/addresses.

Differential revision: https://reviews.llvm.org/D88478

Differential Revision: https://reviews.llvm.org/D88168

Make a helper function that wraps around RDA::isSafeToRemove and
utilises the existing DCE IT block checks.

Differential Revision: https://reviews.llvm.org/D88489

In preparation for making moving TweakFilter from ClangdServer::Options to
a ClangdLSPServer option, and letting it vary per-request.
(In order to implement CodeActionParams.only)

Also a general overdue cleanup.

Differential Revision: https://reviews.llvm.org/D88470

So forwards is forwards and backwards is reverse. Also add a check
so that we know the instructions are in the expected order.

Differential Revision: https://reviews.llvm.org/D88419

Just because we haven't encountered an instruction setting the VPR,
it doesn't mean we can't create a VPT block - the VPR maybe a
live-in.

Differential Revision: https://reviews.llvm.org/D88224

Rather than relaying on CMake to substitute the full path to the lldb
source root, use the  value set in config.lldb_src_root. This makes it
slightly easier to write a custom lit.site.cfg.py.

This test is going to be removed because using dynamic rounding mode
in initializers is changing. It also causes build failures in some
cases, so remove it now.

Since https://reviews.llvm.org/D78522, Symbol is not a Trait itself.

Reviewed By: rriddle

Differential Revision: https://reviews.llvm.org/D88512

During lowering of G_UMULO and friends, the previous code moved the builder's
insertion point to be after the legalizing instruction. When that happened, if
there happened to be a "G_CONSTANT i32 0" immediately after, the CSEMIRBuilder
would try to find that constant during the buildConstant(zero) call, and since
it dominates itself would return the iterator unchanged, even though the def
of the constant was *after* the current insertion point. This resulted in the
compare being generated *before* the constant which it was using.

There's no need to modify the insertion point before building the mul-hi or
constant. Delaying moving the insert point ensures those are built/CSEd before
the G_ICMP is built.

Fixes PR47679

Differential Revision: https://reviews.llvm.org/D88514

These instructions are implemented with two port 5 uops and one port 015 uop so they are more complicated that most shuffles.

This patch increases the depth threshold for when we form them during shuffle combining to try to limit increasing the number of uops especially on port 5.

Differential Revision: https://reviews.llvm.org/D88503

This patch improves the assembly output produced for string literals by
using character literals in byte lists. This provides the benefits of
having printable characters appear as such in the assembly output and of
having strings kept as logical units on the same line.

Reviewed By: daltenty

Differential Revision: https://reviews.llvm.org/D80953

Use the ISA extensions for specific processors in the conventional canonical order.

Give the trace directory argument its own variable
(LLDB_TEST_TRACE_DIRECTORY) so that we can configure it in
lit.site.cfg.py if we so desire.

- Make the consteval constructor for the zero type be noexcept
- Don't expect three-way comparison of 0 against a comparison category
  to fail

llvm.fabs does not need a special handler as llvm.abs as its
single argument type match the return type.

Add class types to the retained types list to make sure they
don't get dropped if the constructor is optimized out later.

Differential Revision: https://reviews.llvm.org/D88522

- Fix a memory leak accidentally introduced yesterday by using CodeGen's
  existing mangling context instead of creating a new context afresh.

- Move GNU-runtime ObjC method mangling into the AST mangler; this will
  eventually be necessary to support direct methods there, but is also
  just the right architecture.

- Make the Apple-runtime method mangling work properly when given an
  interface declaration, fixing a bug (which had solidified into a test)
  where mangling a category method from the interface could cause it to
  be mangled as if the category name was a class name.  (Category names
  are namespaced within their class and have no global meaning.)

- Fix a code cross-reference in dsymutil.

Based on a patch by Ellis Hoag.

NFC. Some small changes to make things more consistent but primarily
avoiding old behavior without any further change.

Lifetime marker intrinsics support any pointer type, so CodeExtractor
does not need to bitcast to `i8*` in order to use these markers.

This causes a build break under -Werror=format.

It turns to be not needed anymore.

Differential Revision: https://reviews.llvm.org/D88520

This happens in glibc's headers. It's important that we recognize these
functions so that we can mark them as returns_twice.

Differential Revision: https://reviews.llvm.org/D88518

* Use an empty struct instead of a member pointer to represent this
  type, so that we don't actually pass a zero member pointer at runtime.

* Mark the constructor as consteval to ensure that no code is emitted
  for it whenever possible.

* Add a honeypot constructor to reject all non-int arguments, so that
  the only argument that can arrive at the real constructor is the
  literal 0.

This results in better generated code, and rejecting invalid comparisons
against nullptr, 0L, and so on, while also rejecting invalid comparisons
against (1-1) and similar that would be allowed if we required an
integer constant expression with value 0.

Differential Revision: https://reviews.llvm.org/D85051

[nfc][libomptarget] Drop parameter to named_sync

named_sync has one call site (in sync.cu) where it always passed L1_BARRIER.
Folding this into the call site and dropping the macro is a simplification.

amdgpu doesn't have ptx' bar.sync instruction. A correct implementation of
__kmpc_impl_named_sync in terms of shared memory is much easier if it can
assume that the barrier argument is this constant. Said implementation is left
for a second patch.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D88474

The flags F_OK, R_OK and W_OK are defined in unistd.h, which does not exist under the Windows platform. Windows still defines the `access` function. Its access flags are documented at https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/access-waccess. For compatibility, define the flags F_OK, R_OK and W_OK using these constants.

This patch is part of the series to make flang compilable with MS Visual Studio <http://lists.llvm.org/pipermail/flang-dev/2020-July/000448.html>.

Reviewed By: klausler

Differential Revision: https://reviews.llvm.org/D88508

The custom implementation of UnsignedInt128 has an implicit conversion operator to unit64_t, but not int64_t. Considering that the former is already truncating, and C++ implicitly converts uint64_t to int64_t, UnsignedInt128  should also support an implicit conversion to int64_t. An analogous conversion would be from uint32_t to int16_t.

Without the conversion operator overload, the msvc emits the following error:
```
descriptor-io.h(44): error C2440: 'static_cast': cannot convert from 'A' to 'int64_t'
        with
        [
            A=Fortran::common::uint128_t
        ]
```

This patch is part of the series to make flang compilable with MS Visual Studio <http://lists.llvm.org/pipermail/flang-dev/2020-July/000448.html>.

Reviewed By: klausler

Differential Revision: https://reviews.llvm.org/D88509

Differential Revision: https://reviews.llvm.org/D88444

@feat.00 is a bitfield read by Microsoft-style linkers, and is required to signal (e.g.) /safeseh support on 32-bit systems.

Reviewed By: rnk

Differential Revision: https://reviews.llvm.org/D88451

MASM allows arbitrary whitespace around the Intel dot operator, especially when used for struct field lookup

Reviewed By: rnk

Differential Revision: https://reviews.llvm.org/D88450

Support the "alias" directive.

Required support for emitWeakReference in MCWinCOFFStreamer.

Reviewed By: thakis

Differential Revision: https://reviews.llvm.org/D87403

Add MASM support for 80-bit reals in the x87 extended precision format.

Reviewed By: thakis

Differential Revision: https://reviews.llvm.org/D87402