As shown in https://github.com/llvm/llvm-project/issues/55150 -
the existing fold may be wrong when converting to a signed value.
This is a quick fix to avoid the miscompile.

I added tests/comments for all of the signed/unsigned combinations
at either side of the boundary width, and tried to confirm with Alive2:
https://alive2.llvm.org/ce/z/3p9DSu

There are already some TODO items in the test file that suggest
possible refinements, so the regression with ui->FP->si is probably ok.
It seems unlikely that we'd see these kind of edge cases with
non-byte-width integer types in real code. The potential miscompile
went undetected for several years.

This and 747c6a0c fixes #55150.

Differential Revision: https://reviews.llvm.org/D124692

hint is a compile time constant and can't be passed in as a variable - we already hardcode

If a constrained intrinsic call was replaced by some value, it was not
removed in some cases. The dangling instruction resulted in useless
instructions executed in runtime. It happened because constrained
intrinsics usually have side effect, it is used to model the interaction
with floating-point environment. In some cases side effect is actually
absent or can be ignored.

This change adds specific treatment of constrained intrinsics so that
their side effect can be removed if it actually absents.

Differential Revision: https://reviews.llvm.org/D118426

This reverts commit a1bb952e.

I'd somehow missed updating llvm-yaml-parser-fuzzer, now fixed.

This reverts commit 1c5e85b3.

It broke a lot of bots with a link error:
https://lab.llvm.org/buildbot/#/builders/171/builds/14222
https://lab.llvm.org/buildbot/#/builders/188/builds/13748
https://lab.llvm.org/buildbot/#/builders/109/builds/38127

Add helper functions to query the signed and scaled properties
of ISD::IndexType along with functions to change them.

Remove setIndexType from MaskedGatherSDNode because it only has
one usage and typically should only be changed alongside its
index operand.

Minimise the direct use of the enum values to lay the groundwork
for more refactoring.

Differential Revision: https://reviews.llvm.org/D123347

All llvm-project fuzzers use this library to parse command-line arguments.
Many of them don't deal with LLVM IR or modules in any way. Bundling those
functions in one library forces build dependencies that don't need to be there.

Among other things, this means check-clang-pseudo no longer depends on most of
LLVM.

Differential Revision: https://reviews.llvm.org/D125081

These are not directly related to the CLI, and are mostly (always?) used when
mutating the modules as part of fuzzing.

Motivation: split FuzzerCLI into its own library that does not depend on IR.
Subprojects that don't use IR should be be fuzzed without the dependency.

Differential Revision: https://reviews.llvm.org/D125080

[X86] Add description comments to SandyBridge for COPY/WriteZero/WriteVecMaskedGatherWriteback cases. NFC.

Match other models.

Use X86WriteRes for WriteVecMaskedGatherWriteback like other models as well.

Alive2: https://alive2.llvm.org/ce/z/2UNVbp

Reviewed By: RKSimon, spatel

Differential Revision: https://reviews.llvm.org/D124503

Splatting a bit of constant-index across a value:
sext (ashr (trunc iN X to iM), M-1) to iN --> ashr (shl X, N-M), N-1
If the dest type is different, use a cast (adjust use check).

https://alive2.llvm.org/ce/z/acAan3

Reviewed By: spatel

Differential Revision: https://reviews.llvm.org/D124590

This reverts commit 203455c8 since
it breaks the OpenMP builders for AMDGPU.

After feedback from D122861, do the same thing with some of the other headers. Try to move the
headers so they have a similar style and way of doing things.

Reviewed By: ldionne, daltenty

Differential Revision: https://reviews.llvm.org/D124227

Reviewed By: ldionne

Differential Revision: https://reviews.llvm.org/D125068

ORC ELFNixPlatform currently only supports x86_64.

This reverts commit 102bc634 because
some tests are failing on sanitizer bots.

Reviewed By: vdonaldson, PeteSteinfeld

Differential Revision: https://reviews.llvm.org/D125140

This applies the change made to libunwind+libcxxabi+libcxx in D113253
to compiler-rt as well.

Differential Revision: https://reviews.llvm.org/D115674

This reverts commit fecad835.

This applies the change made to libunwind+libcxxabi+libcxx in D113253
to compiler-rt as well.

Differential Revision: https://reviews.llvm.org/D115674

Differential Revision: https://reviews.llvm.org/D125082

The globals are better expressed as members of the Symbolizer, and all
functions operating on it should be methods instead.

Also using the standard idiom of wrapping the main code in
`if __name__ == '__main__'`.

Reviewed By: eugenis

Differential Revision: https://reviews.llvm.org/D125032

Reviewed By: eugenis

Differential Revision: https://reviews.llvm.org/D124950

Differential Revision: https://reviews.llvm.org/D125064

This reverts commit db7a87ed.

This seems to cause a PPC buildbot failure:
https://lab.llvm.org/buildbot#builders/93/builds/8787

Since D97044, libc++ implements <stdatomic.h>, which is not compatible
with the <atomic> header in C++03 mode. To fix the tests, avoid using
<stdatomic.h> at all, since it is not strictly required.

rdar://92867529

Differential Revision: https://reviews.llvm.org/D125118

This only adds the customization point object (which isn't pipeable),
the view itself has already been implemented previously.

Differential Revision: https://reviews.llvm.org/D124978

This patch adds a test case for i256 additions and subtractions.  I'm
leaving out multiplications for now, which would result in very long
sequences.

Differential Revision: https://reviews.llvm.org/D125125

The view itself has been implemented previously -- this patch only adds
the ability to pipe it.

Also implements [P1739](https://wg21.link/p1739) (partially) and [LWG3407](https://wg21.link/lwg3407).

Differential Revision: https://reviews.llvm.org/D123600

This change was intended to add the tests check-clang and check-clang-pseudo,
but afterwards it was *only* running those tests.
(This was because unlike add_lit_testsuite, add_lit_testsuite*s* does not
get included in umbrella suites).

This is the idiomatic way to handle include directories in CMake.

Differential Revision: https://reviews.llvm.org/D122614

This changes the ELFNix platform Orc runtime to use, when available,
the __unw_add_dynamic_eh_frame_section interface provided by libunwind
for registering .eh_frame sections loaded by JITLink. When libunwind
is not being used for unwinding, the ELFNix platform detects this and
defaults to the __register_frame interface provided by libgcc_s.

Reviewed By: lhames

Differential Revision: https://reviews.llvm.org/D114961