This is compiled as C code, so it's a good idea to be explicit about the
prototype. Clang complains about this when -Wstrict-prototypes is used.

Differential Revision: https://reviews.llvm.org/D125672

This fixes bug 55463, similar to D78668. This is a temporary fix since
we will switch to post-isel CTR loop determination in the future.

Reviewed By: dim, shchenz

Differential Revision: https://reviews.llvm.org/D125746

The previous fix from af371f9f only applied when using a bottom-up
traversal. The change here applies the constant preprocessing logic to the
top-down case as well. This resolves the issue with the canonicalizer pass still
reordering constants, since it uses a top-down traversal by default.

Fixes #51892

Reviewed By: rriddle

Differential Revision: https://reviews.llvm.org/D125623

%x umin_seq %y is currently expanded to %x == 0 ? 0 : umin(%x, %y).
This patch changes the expansion to umin(%x, freeze %y) instead
(https://alive2.llvm.org/ce/z/wujUhp).

The motivation for this change are the test cases affected by
D124910, where the freeze expansion ultimately produces better
optimization results. This is largely because
`(%x umin_seq %y) == %x` is a common expansion pattern, which
reliably optimizes in freeze representation, but only sometimes
with the zero comparison (in particular, if %x == 0 can fold to
something else, we generally won't be able to cover reasonable
code from this.)

Differential Revision: https://reviews.llvm.org/D125372

When performing runtime unrolling with multiple exits, one of the
earlier (non-latch) exits may exit the loop on the first iteration,
such that we never branch on the latch exit condition. As such, we
need to freeze the condition of the new branch that is introduced
before the loop, as it now executes unconditionally.

Differential Revision: https://reviews.llvm.org/D125754

Always enable opaque pointers in llvm-nm, because the tool doesn't
actually care, and this allows us to read both typed pointer and
opaque pointer bitcode files in one archive. Previously this
depended on the order inside the archive (it would work with an
opaque pointer bitcode file first, but fail with a typed pointer
bitcode file first).

Fixes https://github.com/llvm/llvm-project/issues/55506.

Differential Revision: https://reviews.llvm.org/D125751

The canonicalize command-line options currently have no effect, as the pass is
reading the pass options in its constructor, before they're actually
initialized. This results in the default values of the options always being used.

The change here moves the initialization of the `GreedyRewriteConfig` out of the
constructor, so that it runs after the pass options have been parsed.

Fixes #55466

Reviewed By: rriddle

Differential Revision: https://reviews.llvm.org/D125621

This allows for properly using / as a trigger character, i.e.
more easily allows chaining include directory completions.

This allows for the range to encompass more of the source associated
with the full expression, making diagnostics easier to see/tooling easier/etc.

This causes annoyances when attempting to use space as
a trigger character (to start a different completion).

The existing code was essentially untested; in some cases, it used
too narrow variable types to fit all the bits, in some cases the
bit manipulation operations were incorrect.

For the "ldr lr, [sp], #x" opcode, there's nothing in the documentation
that says it cannot be used in a prologue. (In practice, it would
probably seldom be used there, but technically there's nothing
stopping it from being used.) The documentation only specifies the
operation to replay for unwinding it, but the corresponding mirror
instruction to be printed for a prologue is "str lr, [sp, #-x]!".

Also improve printing of register masks, by aggregating registers
into ranges where possible, and make the printing of the terminating
branches clearer, as "bx <reg>" and "b.w <target>".

Differential Revision: https://reviews.llvm.org/D125643

If a pointer argument is unused within the callee, this argument should
be removed from the function's signature while all used pointer
arguments should be promoted as it is expected. The ArgumentPromotion
pass doesn't touch unused non-pointer arguments at all.

Revert "[clang-format] Fix WhitespaceSensitiveMacros not being honoured when macro closing parenthesis is followed by a newline."

This reverts commit 50cd52d9.

It provoked regressions in C++ and ObjectiveC as described in https://reviews.llvm.org/D123676#3515949.

Reproducers:
```
MACRO_BEGIN
#if A
int f();
#else
int f();
#endif
```

```
NS_SWIFT_NAME(A)
@interface B : C
@property(readonly) D value;
@end
```

This patch cleans up multiple getMaybeValue functions to take an IdKind instead
of special functions.

Reviewed By: arjunp

Differential Revision: https://reviews.llvm.org/D125617

This patch changes `FlatAffineValueConstraints` to only allow attaching
values to non-local identifiers.

The reasoning for this change is:
1. Information attached to local identifiers can be lost since local identifiers
  can be removed for output size optimizations.
2. There are no current use cases for attaching values to Local identifiers.
3. Attaching a value to a local identifier does not make sense since a local
  identifier represents existential quantification.

This patch also adds some additional asserts to the affected functions.

Reviewed By: arjunp, bondhugula

Differential Revision: https://reviews.llvm.org/D125613

This code pre-exists the generic handling for inaccessiblememonly.  If we remove it and update one test with inaccessiblememonly, nothing else changes.  Note that simply running O1 on that test would annotate malloc with the missing inaccessiblememonly.

CSKY is always in 4-byte align, no matter it's long long type.
For global aggregate variable, it's 4-byte align if its size is bigger than or equal to 4 bytes.

Differential Revision: https://reviews.llvm.org/D124977

Based on D123467.

Reviewed By: rampitec

Differential Revision: https://reviews.llvm.org/D124508

This patch makes JumpThreading's ProcessImpliedCondition deal with frozen
conditions.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D84941

Reviewed By: MaskRay

differential Revision: https://reviews.llvm.org/D125544

Added handling rounding behavior in 32-bits for when possible. This
avoids kernel compilation generating scalarized code on platforms where
64-bit vectors are not available.

As the 48-bit lowering requires 64-bit anyway, we added a full 64-bit
solution simplifying the old path.

Reviewed By: dcaballe, mravishankar

Differential Revision: https://reviews.llvm.org/D125583

This reverts commit 79a66ec9.

The stronger asserts served their purpose; I stumbled across another bug.  Will reapply once this one is also fixed.

The bug appears to be a variant of a previous one:
* We mutate an instruction in one block.
* That mutation changes the phase3 results of another block.

This is very similiar to a previous issue, except cross block instead of within a single block.

Before this fix, the bufferization implementation made the incorrect assumption that the values yielded from the "before" region must match with the values yielded from the "after" region.

Differential Revision: https://reviews.llvm.org/D125835

This diff adjusts binaryAnd to take advantage of the analysis
based on KnownBits.

Differential revision: https://reviews.llvm.org/D125603

Test plan:
1/ ninja check-llvm
2/ ninja check-llvm-unit

Addresses the warnings emitted by Apple Clang 13.1.6 (Xcode 13.3.1).
Tip @tschuett issue #55404.

Reviewed By: rafauler

Differential Revision: https://reviews.llvm.org/D125733

Split up the BinaryLoop header and move BinaryDominatorTree into its own header,
preparing it for a standalone use.

Reviewed By: rafauler

Differential Revision: https://reviews.llvm.org/D125664

After adding sprintf, snprintf is simple. The functions are very
similar. The tests only cover the behavior of the max length since the
sprintf tests should cover the other behavior.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D125826

Sub-expressions that are logical operators are not spelled out
separately in basic blocks, so we need to manually visit them when we
encounter them. We do this in both the `TerminatorVisitor`
(conditionally) and the `TransferVisitor` (unconditionally), which can
cause cause an expression to be visited twice when the binary
operators are nested 2+ times.

This changes the visit in `TransferVisitor` to check if it has been
evaluated before trying to visit the sub-expression.

Differential Revision: https://reviews.llvm.org/D125821

[trace][intelpt] Support system-wide tracing [6] - Break IntelPTCollector into smaller files and minor refactor

IntelPTCollector is very big and has 3 classes in it. It's actually cleaner if each one has its own file. This also gives more visibility to the developer about the different kinds of "tracers" that we have.

Besides that, I'm now restricting the creation of the BinaryData chunks to GetState() instead of having it in different places, which is not very clean, because the gdb-remote protocol should be as restricted as possible.

Differential Revision: https://reviews.llvm.org/D125047

[trace][intelpt] Support system-wide tracing [5] - Disable/enable per-core tracing based on the process state

When tracing on per-core mode, we are tracing all processes, which means
that after hitting a breakpoint, our process will stop running (thus
producing no more tracing data) but other processes will continue
writing to our trace buffers. This causes a big data loss for our trace.
As a way to remediate this, I'm adding some logic to pause and unpause
tracing based on the target's state. The earlier we do it the better,
however, I'm not adding the trigger at the earliest possible point for
simplicity of this diff. Later we can improve that part.

Differential Revision: https://reviews.llvm.org/D124962

This diffs implements per-core tracing on lldb-server. It also includes tests that ensure that tracing can be initiated from the client and that the jLLDBGetState ppacket returns the list of trace buffers per core.

This doesn't include any decoder changes.

Finally, this makes some little changes here and there improving the existing code.

A specific piece of code that can't reliably be tested is when tracing
per core fails due to permissions. In this case we add a
troubleshooting message and this is the manual test:

```
/proc/sys/kernel/perf_event_paranoid set to 1

(lldb) process trace start --per-core-tracing                                         error: perf event syscall failed: Permission denied
 You might need that /proc/sys/kernel/perf_event_paranoid has a value of 0 or -1.
``

Differential Revision: https://reviews.llvm.org/D124858

Differential Revision: https://reviews.llvm.org/D125279