If `LLVM_BUILD_MAIN_SRC_DIR` is not defined, just assume we are in
regular monorepo layout. Non-standard (and not really supported) layouts
can still be configured manually.

Reviewed By: beanz

Differential Revision: https://reviews.llvm.org/D132314

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D132141

extractShiftForRotate may fail to return canonicalized shifts due to constant folding or other simplification that can occur in getNode()

Fixes Issue #57283

This allows the language mode for HLSL to be inferred from the file
extension.

This change came in a few hours ago and introduced a warning. The fix
is trivial, so I'm providing it. The original change was reviewed here:

https://reviews.llvm.org/D132331

This reverts commit 07e34763.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D132141

MSVC is not picking up a variable capture somehow, try moving it inside.

Move the large lambda out of BinaryFunction::disassemble, reducing its size from
255 to 233 LoC.

Reviewed By: rafauler

Differential Revision: https://reviews.llvm.org/D132104

Move the large lambda out of BinaryFunction::disassemble, reducing its size from
295 to 255 LoC.

Differential Revision: https://reviews.llvm.org/D132101

Move the large lambda out of BinaryFunction::disassemble, reducing its size from
338 to 295 LoC.

Reviewed By: rafauler

Differential Revision: https://reviews.llvm.org/D132100

Move the large lambda out of BinaryFunction::disassemble, reducing its size from
377 to 338 LoC.

Reviewed By: rafauler

Differential Revision: https://reviews.llvm.org/D132099

We're seeing the following warnings with --rtlib=compiler-rt:

  lld-link: warning: ignoring unknown argument '--as-needed'
  lld-link: warning: ignoring unknown argument '-lunwind'
  lld-link: warning: ignoring unknown argument '--no-as-needed'

MSVC doesn't use the unwind library, so just omit it.

Differential Revision: https://reviews.llvm.org/D132440

Some tests still pass even though we don't claim big-endian support. Using
UNSUPPORTED is a better indicator than XFAIL that we don't guarantee that
the tests work.

Dialects can opt-in to providing custom encodings by implementing the
`BytecodeDialectInterface`. This interface provides hooks, namely
`readAttribute`/`readType` and `writeAttribute`/`writeType`, that will be used
by the bytecode reader and writer. These hooks are provided a reader and writer
implementation that can be used to encode various constructs in the underlying
bytecode format. A unique feature of this interface is that dialects may choose
to only encode a subset of their attributes and types in a custom bytecode
format, which can simplify adding new or experimental components that aren't
fully baked.

Differential Revision: https://reviews.llvm.org/D132498

This moves some parsing functionality from BytecodeReader to
AttrTypeReader, and removes some duplication between the attribute/type
code paths.

Differential Revision: https://reviews.llvm.org/D132497

This extracts the string section writer and reader into dedicated
classes, which better separates the logic and will also simplify future
patches that want to interact with the string section.

Differential Revision: https://reviews.llvm.org/D132496

The existing code resulted in the max size and access counts being equal
to the min. Compute the max instead (max lifetime was already correct).

Differential Revision: https://reviews.llvm.org/D132515

The constructors of non-POD array elements are evaluated under
certain conditions. This patch makes sure that in such cases
we also evaluate the destructors.

Differential Revision: https://reviews.llvm.org/D130737

Keep the original data type of integer do-variables
for structured loops. When do-variable's data type
is an integer type shorter than IndexType, processing
the do-variable separately from the DoLoop's iteration index
allows getting rid of type casts, which can make backend
optimizations easier.

For example,
```
  do i = 2, n-1
    do j = 2, n-1
      ... = a(j-1, i)
    end do
  end do
```

If value of 'j' is computed by casting the DoLoop's iteration
index to 'i32', then Flang will produce the following LLVM IR:
```
  %1 = trunc i64 %iter_index to i32
  %2 = sub i32 %1, 1
  %3 = sext i32 %2 to i64
```

LLVM's InstCombine may try to get rid of the sign extension,
and may transform this into:
```
  %1 = shl i64 %iter_index, 32
  %2 = add i64 %1, -4294967296
  %3 = ashr exact i64 %2, 32
```

The extra computations for the element address applied on top
of this awkward pattern confuse LLVM vectorizer so that
it does not recognize the unit-strided access of 'a'.

Measured performance improvements on `SPEC CPU2000@IceLake`:
```
168.wupwise:    11.96%
171.swim:       11.22%
172.mrgid:      56.38%
178.galgel:      7.29%
301.apsi:        8.32%
```

Differential Revision: https://reviews.llvm.org/D132176

Differential Revision: https://reviews.llvm.org/D132180

Differential Revision: https://reviews.llvm.org/D132175

This now allows enabling the chmod function on aarch64.

Trying to figure out intermittent failure on reverse-iteration buildbot.

(ctpop x) == 1 --> (x != 0) && ((x & x-1) == 0)

Adjust the legality check to avoid the poor codegen on AArch64.
We probably only want to use popcount on this pattern when it
is a single instruction.

fixes #57225

Differential Revision: https://reviews.llvm.org/D132237

More coverage for D132237

The existing tests were added with 2880d7b9, but
discussion in D132412 suggests that we should start
with a simpler pattern (the more complicated pattern
may not be a real problem).

342e0ebd reverted LLVM_ENABLE_RUNTIMES incompletly and missed /runtimes
part. This target has no issues with LLVM_ENABLE_RUNTIMES, so we can
keep it.

It runs 8 threads. Sometimes tsan is able to detect more than one of the
same race.

We build libcxx using LLVM_ENABLE_RUNTIMES during Stage2, which requires
cxx-headers to be part of LLVM_RUNTIME_DISTRIBUTION_COMPONENTS instead
of LLVM_DISTRIBUTION_COMPONENTS.

rdar://99028431

Differential Revision: https://reviews.llvm.org/D132488

"this" parameter of lambda if undef, notnull and differentiable.
So we need to pass something consistent.

Any alloca will work. It will be eliminated as unused later by optimizer.

Otherwise we generate code which Msan is expected to catch.

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D132275

This title says it all.

Differential Revision: https://reviews.llvm.org/D132179

For mingw target, if a symbol is not marked DSO local, a `.refptr` is
generated for it. This makes CFG check calls use an extra pointer
dereference, which adds extra overhead compared to the MSVC version,
so mark the CFG guard check funciton pointer DSO local to stop it.
This should have no effect on MSVC target.

Also adapt the existing cfguard tests to run for mingw targets, so that
this change is checked.

Reviewed By: rnk

Differential Revision: https://reviews.llvm.org/D132331

To support using Control Flow Guard with mingw-w64, Clang needs to
accept `__declspec(guard(nocf))` also for the GNU target. Since mingw
has `#define __declspec(a) __attribute__((a))` as built-in, the simplest
solution is to accept `__attribute__((guard(nocf)))` to be compatible with
MSVC and Clang's msvc target.

As a side effect, this also adds `[[clang::guard(nocf)]]` for C++.

Reviewed By: aaron.ballman

Differential Revision: https://reviews.llvm.org/D132302

Change loop induction variable type to match the type of "SIZE" where it's compared against, to prevent infinite loop caused by overflow wraparound if there are more than 2^32 samples

Reviewed By: wenlei

Differential Revision: https://reviews.llvm.org/D132493

This reverts commit 0cbfd6fd.

A test is crashing with the shared_lib config.

For unions constructors with empty bodies behave differently
(in comparison with structs/classes) and clang-tidy's fix
might break the code. This diff adjusts the check to skip unions
for now (it seems to be a relatively rare case).

Test plan: ninja check-all

Differential revision: https://reviews.llvm.org/D132290

Reviewed By: antiagainst

Differential Revision: https://reviews.llvm.org/D132428