[ARC] ARCRegisterInfo cleanup prior to adding core register pairs (ARC32) and 64-bit core registers (ARC64)

Differential Revision: https://reviews.llvm.org/D11108

Some subprojects like compiler-rt define the `darwin` feature in their
lit config, but clang does not do that, so we need to use the global
`system-darwin` here instead.

Differential Revision: https://reviews.llvm.org/D111267

LoopFlatten does preserve loop analyses (DT, LI and SCEV), but
currently doesn't mark them as preserved in the NewPM (they are
marked as preserved in the LegacyPM). I think this doesn't really
have an effect in the end because the loop pass adaptor will just
assume they're preserved anyway, but let's be explicit about this
for the sake of clarity.

Differential Revision: https://reviews.llvm.org/D111328

Updates the Bazel config for changes from
https://github.com/llvm/llvm-project/commit/3b01cf9286
by adding configuration for the new OpenMPOpsInterfaces tablegn target.

Differential Revision: https://reviews.llvm.org/D111347

Vendors take libc++ and ship it in various ways. Some vendors might
ship it differently from what upstream LLVM does, i.e. the install
location might be different, some ABI properties might differ, etc.

In the past few years, I've come across several instances where
having a place to test some of these properties would have been
incredibly useful. I also just got bitten by the lack of tests
of that kind, so I'm adding some now.

The tests added by this commit for Apple platforms have numerous
TODOs that capture discrepancies between the upstream LLVM CMake
and the slightly-modified build we perform internally to produce
Apple's system libc++. In the future, the goal would be to upstream
all those differences so that it's possible to build a faithful
Apple system libc++ with the upstream LLVM sources only.

But this isn't only useful for Apple - this lays out the path for
any vendor being able to add their own checks (either upstream or
downstream) to libc++.

This is a re-application of 9892d164, which was reverted in 138dc271
because it broke the build. The issue was that we didn't apply the required
changes to libunwind and our CI didn't notice it because we were not
running the libunwind tests. This has been fixed now, and we're running
the libunwind tests in CI now too.

Differential Revision: https://reviews.llvm.org/D110736

Some subprojects like compiler-rt define the `darwin` feature in their
lit config, but lld does not do that, so we need to use the global
system-darwin here instead. This test seems to have drifted from the
actual behavior so I also had to add `/usr/local/lib` here to make it
pass.

Differential Revision: https://reviews.llvm.org/D111268

Revert "Reland A new option -print-on-crash that prints the IR as it was upon entering the last pass when there is a crash."

This reverts commit 13d15927.

This helps with examples like:
https://llvm.org/PR52057
...but we need at least one more fold to fix that case.

Differential Revision: https://reviews.llvm.org/D111007

Differential Revision: https://reviews.llvm.org/D111006

When PHIElimination adds kills after lowering PHIs to COPYs it knows
that some instructions after the inserted COPY might use the same
SrcReg, but it was only looking at the terminator instructions at the
end of the block, not at other instructions like INLINEASM_BR that can
appear after the COPY insertion point.

Since we have already called findPHICopyInsertPoint, which knows about
INLINEASM_BR, we might as well reuse the insertion point that it
calculated when looking for instructions that might use SrcReg.

This fixes a machine verification failure if you force machine
verification to run after PHIElimination (currently it is disabled for
other reasons) when running
test/CodeGen/X86/callbr-asm-phi-placement.ll.

Differential Revision: https://reviews.llvm.org/D110834

Reland A new option -print-on-crash that prints the IR as it was upon entering the last pass when there is a crash.

Summary:
The IR is saved in its print form before each pass is started and a
signal handler is registered.  If the compilation crashes, the signal
handler will print the saved IR to dbgs().  This option
can be modified using -print-module-scope to get the IR for the complete
module.  Filtering options can be used to improve performance by limiting
which passes (or functions) save the IR.  Note that this option only works
with the new pass manager.

Author: Jamie Schmeiser <schmeise@ca.ibm.com>
Reviewed By: aeubanks (Arthur Eubanks) yrouban (Yevgeny Rouban)
Differential Revision: https://reviews.llvm.org/D86657

Add an interface for outlineable OpenMP operations.
This patch was initially done in fir-dev and is now needed
for the upstreaming.

Reviewed By: schweitz

Differential Revision: https://reviews.llvm.org/D111310

[mlir][python] Temporarily disable test for converting unsupported DenseElementsAttr types to a buffer.

* Need to investigate the proper solution to https://github.com/pybind/pybind11/issues/3336 or engineer something different.
* The attempt to produce an empty buffer_info as a workaround triggers asan/ubsan.
* Usage of this API does not arise naturally in practice yet, and it is more important to be asan/crash clean than have a solution right now.
* Switching back to raising an exception, even though that triggers terminate().

X86InstrInfo::convertToThreeAddress would convert this:

  %1:gr32 = ADD32rr killed %0:gr32(tied-def 0), %0:gr32, implicit-def dead $eflags

to this:

  undef %2.sub_32bit:gr64 = COPY killed %0:gr32
  undef %3.sub_32bit:gr64_nosp = COPY %0:gr32
  %1:gr32 = LEA64_32r killed %2:gr64, 1, killed %3:gr64_nosp, 0, $noreg

Note that in the ADD32rr, %0 was used twice and the first use had a kill
flag, which is what MachineInstr::addRegisterKilled does.

In the converted code, each use of %0 is copied to a new reg, and the
first COPY inherits the kill flag from the ADD32rr. This causes
machine verification to fail (if you force it to run after
TwoAddressInstructionPass) because the second COPY uses %0 after it is
killed. Note that machine verification is currently disabled after
TwoAddressInstructionPass but this is a step towards being able to
enable it.

Fix this by not inserting more than one COPY from the same source
register.

Differential Revision: https://reviews.llvm.org/D110829

Otherwise we may end up with an inconsistent redeclarations of the standard
library functions if _FORTIFY_SOURCE is in effect.

https://bugs.llvm.org/show_bug.cgi?id=47869

Differential Revision: https://reviews.llvm.org/D110781

This is a straight port from the equivalent DAG combine.

Differential Revision: https://reviews.llvm.org/D110890

Zbc RUN lines should use ZBC instead of BC in their prefix.

This is in preparation for another patch I'm planning to send later.

Extracted from Itay Bookstein's D108872.

In the review of D111085 it was pointed out that these functions don't
conform to the naming scheme in use in LLVM. With this commit we should
be good for all of FPEnv.h.

Print this basic block flag as inlineasm-br-indirect-target and parse
it. This allows you to write MIR test cases for INLINEASM_BR. The test
case I added is one that I wanted to precommit anyway for D110834.

Differential Revision: https://reviews.llvm.org/D111291

This patch fixes problems reported in PR51981.

When rotating a loop it isn't enough to just forget SCEV for that
loop nest. When rotating we might clone some instructions from the
old header into the preheader, and insert new PHI nodes to merge
values together. There could be users of the original value that are
updated to use the PHI result. And those users were not necessarily
depending on a PHI node earlier, so they weren't cleaned up when just
forgetting all SCEV:s for the loop nest. So we need to explicitly
forget those values to avoid invalid cached SCEV expressions.

Reviewed By: fhahn, mkazantsev

Differential Revision: https://reviews.llvm.org/D110813

Reviewed By: fhahn

Differential Revision: https://reviews.llvm.org/D110812

mingw-g++ does not correctly support the full `std::errc` namespace as
worded in the standard[1]. As such, we cannot reliably use all names
therein. This patch changes the use of
`std::errc::state_not_recoverable`, to use portable error codes from the
`llvm::errc` equivalent.

[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71444

Reviewed by v.g.vassilev
Differential Revision: https://reviews.llvm.org/D111315

This patch fixes:

  llvm-project/lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc.cpp:204:6:
  error: missing field 'invalidate_regs' initializer
  [-Werror,-Wmissing-field-initializers]

getScalarSizeInBits() doesn't work if the scalar type is a pointer.
For that we need to go through DataLayout.

Desccribe in cxx_status.html the missing parts of the partially
implemented proposals described in cxx_status.html.

Uses <details> blocks so the information appears collapsed
by default.

This patch updates the vec_popcnt builtins to return vector unsigned,
as defined by the Power Vector Intrinsics Programming Reference.
This patch is NFC and all existing tests pass.

Differential Revision: https://reviews.llvm.org/D110934

https://alive2.llvm.org/ce/z/4BE33w

This is the logical (select-form) equivalent of the bitwise logic fold:
e36d351d

This is another part of solving the regression from:
https://llvm.org/PR52077

This change is to keep the help text and command guide of llvm-readelf
in tandem.

 - In the help text mention that --section-data, --section-relocations,
   --section-symbols and --stack-sizes have no effect on GNU style
   output; give the accepted values for --elf-output-style and update
   the description of --gnu-hash-table to use the command guide
   description.
 - In the command guide add the missing options -a,
   --dependant-libraries,--no-demangle, --wide and -W. Also update the
   description of --symbols so it matches the help text.

Differential Revision: https://reviews.llvm.org/D111240

Replace `&__rhs` with `_VSTD::addressof(__rhs)` to guard against ADL hijacking
of `operator&` in `operator=`. Thanks to @CaseyCarter for bringing it to our
attention.

Similar issues with hijacking `operator&` still exist, they will be
addressed separately.

Reviewed By: #libc, Quuxplusone, ldionne

Differential Revision: https://reviews.llvm.org/D110852

This has started failing since we moved our bots to Focal.
For unknown reasons the abort_caller stack is missing when
we check from the handler breakpoint.

Mark unsupported while I investigate.

Fixed formatting issues reported by clang-format

Differential Revision: https://reviews.llvm.org/D111255

* This already half existed in terms of reading the raw buffer backing a DenseElementsAttr.
* Documented the precise expectations of the buffer layout.
* Extended the Python API to support construction from bitcasted buffers, allowing construction of all primitive element types (even those that lack a compatible representation in Python).
* Specifically, the Python API can now load all integer types at all bit widths and all floating point types (f16, f32, f64, bf16).

Differential Revision: https://reviews.llvm.org/D111284

SCEV-based salvaging will use excessive resources if it encounters
very long SCEV expressions. This patch places a limit on the length of
SCEV expression that salvaging will attempt to translate.

Reviewed by: Orlando

Differential Revision: https://reviews.llvm.org/D110558