warning: type qualifiers ignored on cast result type [-Wignored-qualifiers]

Differential Revision: https://reviews.llvm.org/D86952

The TempDir.path() member function returns a StringRef. We've been
calling the data() method on that StringRef, which does not guarantee
to return a null-terminated string (required by chdir and other POSIX
functions).

Introduce the c_str() method in the TempDir class, which returns the
proper string without the need to create a copy of the path at use site.

This was a missed simplication in D87200

Define a _LIBUNWIND_USE_DL_ITERATE_PHDR macro in config.h when there is
no other unwind info lookup method. Also define a
_LIBUNWIND_USE_DL_UNWIND_FIND_EXIDX macro to factor out
(__BIONIC__ and _LIBUNWIND_ARM_EHABI).

Differential Revision: https://reviews.llvm.org/D86768

Since a function might have portions of its code coming from multiple
different files, "start line" is ambiguous (it can't just be resolved
relative to the file/line specified). Add start file to disambiguate it.

[SelectionDAGBuilder] Pass fast math flags to getNode calls rather than trying to set them after the fact.:

This removes the after the fact FMF handling from D46854 in favor of passing fast math flags to getNode. This should be a superset of D87130.

This required adding a SDNodeFlags to SelectionDAG::getSetCC.

Now we manage to contant fold some stuff undefs during the
initial getNode that we don't do in later DAG combines.

Differential Revision: https://reviews.llvm.org/D87200

Body of unrolled loop was missing opening bracket.

Reviewed By: Meinersbur

Differential Revision: https://reviews.llvm.org/D87329

- Introduce a new BlockRange class to represent range of blocks (constructible from
  an ArrayRef<Block *> or a SuccessorRange);
- Change Operation::create() methods to use TypeRange for result types, ValueRange for
  operands and BlockRange for successors.

Differential Revision: https://reviews.llvm.org/D86985

Failing example: v8i8 = truncate v8i32. v8i8 is legal, but v8i32 was
widened to HVX. Make sure that v8i8 does not get altered (even if it's
changed to another legal type).

Used for https://github.com/google/sanitizers/issues/1193

Reviewed By: morehouse

Differential Revision: https://reviews.llvm.org/D86933

Fixes https://github.com/google/sanitizers/issues/1193.

AsanChunk can be uninitialized yet just after return from the secondary
allocator. If lsan starts scan just before metadata assignment it can
fail to find corresponding AsanChunk.

It should be safe to ignore this and let lsan to assume that
AsanChunk is in the beginning of the block. This block is from the
secondary allocator and created with mmap, so it should not contain
any pointers and will make lsan to miss some leaks.

Similar already happens for primary allocator. If it can't find real
AsanChunk it falls back and assume that block starts with AsanChunk.
Then if the block is already returned to allocator we have  garbage in
AsanChunk and may scan dead memory hiding some leaks.
I'll fix this in D87135.

Reviewed By: morehouse

Differential Revision: https://reviews.llvm.org/D86931

This reverts commit 5b2b4f33.

This caused a link error in
http://lab.llvm.org:8011/builders/lldb-x64-windows-ninja/builds/18794/steps/build/logs/stdio

Differential Revision: https://reviews.llvm.org/D87324

Extract a simple check to check if a `RecordDecl` is a `CFError` Decl.
This is a simple refactoring to prepare for an upcoming change.  NFC.

Patch is extracted from
https://github.com/llvm/llvm-project-staging/commit/8afaf3aad2af43cfedca7a24cd817848c4e95c0c.

add release note

Implement known bits for the min/max intrinsics based on the
recently added KnownBits primitives.

We already have test coverage for the underlying calculation,
this just checked that the folding is wired up...

The test is being disabled on Linux, as lldb-vscode has a bug with
--wait-for on LInux.
I'm also fixing some compilation warnings.

The get{Return,Unwind,Unreachable}Block functions in
UnifyFunctionExitNodes have not been used for many years,
so just remove them.

Reviewed By: bjope

Differential Revision: https://reviews.llvm.org/D87078

MarkLive::scanEhFrameSection is used to retain personality/LSDA
functions when --gc-sections is enabled.

Improve its performance by only iterating over the .eh_frame relocations
that need to be resolved for an EhSectionPiece. This optimization makes
the same assumption as elsewhere in LLD that the .eh_frame relocations
are sorted by r_offset.

This appears to be a performance regression introduced in commit
e6c24299 (https://reviews.llvm.org/D59800).

This change has been seen to reduce link time by up to ~50%.

Differential Revision: https://reviews.llvm.org/D87245

This diff adds a test which checks the error-message when multiple input files
are passed to llvm-install-name-tool.

Test plan: make check-all

Differential revision: https://reviews.llvm.org/D87268

 - Fix it to work on Apple Silicon
 - Add testcases for simulators running on Apple Silicon

If the abs is poisoning, this is already folded to true/false.
For non-poisoning abs, we can convert this to a comparison with
the operand.

If we know that the abs operand is known negative, we can replace
it with a neg.

To avoid computing known bits twice, I've removed the fold for the
non-negative case from InstSimplify. Both the non-negative and the
negative case are handled by InstCombine now, with one known bits call.

Differential Revision: https://reviews.llvm.org/D87196

D66230 attempted to fix a problem where when there are allocas used before CoroBegin.
It keeps allocas and their uses stay in put if there are no escapse/changes to the data before CoroBegin.
Unfortunately that's incorrect.
Consider this code:

%var = alloca i32
%1 = getelementptr .. %var; stays put
%f = call i8* @llvm.coro.begin
store ... %1
After this fix, %1 will now stay put, however if a store happens after coro.begin and hence modifies the content, this change will not be reflected in the coroutine frame (and will eventually be DCEed).
To generalize the problem, if any alias ptr is created before coro.begin for an Alloca and that alias ptr is latter written into after coro.begin, it will lead to incorrect behavior.

There are also a few other minor issues, such as incorrect dominate condition check in the ptr visitor, unhandled memory intrinsics and etc.
Ths patch attempts to fix some of these issue, and make it more robust to deal with aliases...

SSE4_1 and SSE4_2 due imply SSSE3. So I guess I got confused when
switching the code to being table based in D83273.

Fixes PR47464

This reverts commit 514df1b2.

Some of the buildbots got llvm-lit errors on CodeGen/volatile.c

Add APInt forward declaration and move include to RISCVMatInt.cpp

D28596 added SANITIZER_INTERFACE_WEAK_DEF which can guarantee `*_default_options` are always defined.
The weak attributes on the `__{asan,lsan,msan,ubsan}_default_options` declarations can thus be removed.

`MaybeCall*DefaultOptions` no longer need nullptr checks, so their call sites can just be replaced by `__*_default_options`.

Reviewed By: #sanitizers, vitalybuka

Differential Revision: https://reviews.llvm.org/D87175

Differential Revision: https://reviews.llvm.org/D87177

This patch resumes the work of D16586.
According to the AAPCS, volatile bit-fields should
be accessed using containers of the widht of their
declarative type. In such case:
```
struct S1 {
  short a : 1;
}
```
should be accessed using load and stores of the width
(sizeof(short)), where now the compiler does only load
the minimum required width (char in this case).
However, as discussed in D16586,
that could overwrite non-volatile bit-fields, which
conflicted with C and C++ object models by creating
data race conditions that are not part of the bit-field,
e.g.
```
struct S2 {
  short a;
  int  b : 16;
}
```
Accessing `S2.b` would also access `S2.a`.

The AAPCS Release 2020Q2
(https://documentation-service.arm.com/static/5efb7fbedbdee951c1ccf186?token=)
section 8.1 Data Types, page 36, "Volatile bit-fields -
preserving number and width of container accesses" has been
updated to avoid conflict with the C++ Memory Model.
Now it reads in the note:
```
This ABI does not place any restrictions on the access widths of bit-fields where the container
overlaps with a non-bit-field member or where the container overlaps with any zero length bit-field
placed between two other bit-fields. This is because the C/C++ memory model defines these as being
separate memory locations, which can be accessed by two threads simultaneously. For this reason,
compilers must be permitted to use a narrower memory access width (including splitting the access into
multiple instructions) to avoid writing to a different memory location. For example, in
struct S { int a:24; char b; }; a write to a must not also write to the location occupied by b, this requires at least two
memory accesses in all current Arm architectures. In the same way, in struct S { int a:24; int:0; int b:8; };,
writes to a or b must not overwrite each other.
```

Patch D16586 was updated to follow such behavior by verifying that we
only change volatile bit-field access when:
 - it won't overlap with any other non-bit-field member
 - we only access memory inside the bounds of the record
 - avoid overlapping zero-length bit-fields.

Regarding the number of memory accesses, that should be preserved, that will
be implemented by D67399.

Differential Revision: https://reviews.llvm.org/D72932

The following people contributed to this patch:
- Diogo Sampaio
- Ties Stuij

https://reviews.llvm.org/D86611

When the function return type is non-void and `end` instructions are at
the very end of a function, CFGStackify's `fixEndsAtEndOfFunction`
function fixes the corresponding block/loop/try's type to match the
function's return type. This is applied to consecutive `end` markers at
the end of a function. For example, when the function return type is
`i32`,
```
block i32    ;; return type is fixed to i32
  ...
  loop i32   ;; return type is fixed to i32
    ...
  end_loop
end_block
end_function
```

But try-catch is a little different, because it consists of two parts:
a try part and a catch part, and both parts' return type should satisfy
the function's return type. Which means,
```
try i32      ;; return type is fixed to i32
  ...
  block i32  ;; this should be changed i32 too!
    ...
  end_block
catch
  ...
end_try
end_function
```
As you can see in this example, it is not sufficient to only `end`
instructions at the end of a function; in case of `try`, we should
check instructions before `catch`es, in case their corresponding `try`'s
type has been fixed.

This changes `fixEndsAtEndOfFunction`'s algorithm to use a worklist
that contains a reverse iterator, each of which is a starting point for
a new backward `end` instruction search.

Fixes https://bugs.llvm.org/show_bug.cgi?id=47413.

Reviewed By: dschuff, tlively

Differential Revision: https://reviews.llvm.org/D87207

We only need to include MachineInstrBundle.h, but exposes an implicit dependency in MachineOutliner.h.

Also, remove duplicate includes from LiveRegUnits.cpp + MachineOutliner.cpp.

Currently, there is no option to allow for unrolling a loop up to a specific factor (specified by the user).
The code for doing that is there and there are benefits when unrolling is done  to smaller loops (smaller than the factor specified).

Reviewed By: bondhugula

Differential Revision: https://reviews.llvm.org/D87111

Without this, builds with `-DBUILD_SHARED_LIBS=ON` fail.