Also makes LINK_TEST customizable from commandline with `--test` option.

This would fail in test environments with < 3 hardware threads.

Differential Revision: https://reviews.llvm.org/D99858

We can clear line by line, but that's likely not very important.

Reviewed By: hans

Differential Revision: https://reviews.llvm.org/D99921

This is a followup to D98145: As far as I know, tracking of kill
flags in FastISel is just a compile-time optimization. However,
I'm not actually seeing any compile-time regression when removing
the tracking. This probably used to be more important in the past,
before FastRA was switched to allocate instructions in reverse
order, which means that it discovers kills as a matter of course.

As such, the kill tracking doesn't really seem to serve a purpose
anymore, and just adds additional complexity and potential for
errors. This patch removes it entirely. The primary changes are
dropping the hasTrivialKill() method and removing the kill
arguments from the emitFast methods. The rest is mechanical fixup.

Differential Revision: https://reviews.llvm.org/D98294

Mostly just works already.

Linux-only for now. Some mac bits stubbed out, but not tested.

Good enough for the tiny_race.c example at
https://clang.llvm.org/docs/ThreadSanitizer.html :

   $ out/gn/bin/clang -fsanitize=address -g -O1 tiny_race.c
   $ while true; do ./a.out || echo $? ; done

While here, also make `-fsanitize=address` work for .c files.

Differential Revision: https://reviews.llvm.org/D99795

Add header guards and fix other clang-tidy warnings in .h files.
Also align misaligned header docs

Reviewed By: aeubanks

Differential Revision: https://reviews.llvm.org/D99634

This reverts commit 2c3cf62d.

Causes build failures on x86_64, will respond to commit thread with link errors.

That's how it was originally intended but that wasn't possible because
we still needed to support older CMake versions.

The problem here is that the sources in TableGenGlobalISel are meant to
be linked into both llvm-tblgen and TableGenTests (a unit test), but not
be part of LLVM proper. So they shouldn't be an ordinary LLVM component.
Because they are used in llvm-tblgen, they can't draw in the LLVM dylib
dependency, but then we'd have to do the same thing in TableGenTests to
make sure we don't link both a static Support library and another copy
through the LLVM dylib.

With an object library we're just reusing the object files and don't
have to care about dependencies at all.

Reviewed By: beanz

Differential Revision: https://reviews.llvm.org/D74588

I have seen this error quite frequently in our out-of-tree CHERI backends
and the lack of location information sometimes makes it quite difficult
to track down the actual source of the error.
This patch changes the llvm_unreachable() to a PrintFatalError() so that
tablegen prints a stack of source locations.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D99468

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D99404

This reverts commit 13aff21f,
since the CMake part relanded in c06a8f9c.

The GN part is a bit simpler than last time due to the
prior simplifications in acea470c.

Add a new delta pass to llvm-reduce that removes dso_local when possible

Reviewed By: aeubanks

Differential Revision: https://reviews.llvm.org/D98673

[X86][update_llc_test_checks] Use a less greedy regular expression for replacing constant pool labels in tests.

While working on D97208 I noticed that these greedy regular
expressions prevent tests from failing when (%rip) appears after
a constant pool label when it didn't before.

Reviewed By: RKSimon, pengfei

Differential Revision: https://reviews.llvm.org/D99460

RVV intrinsics has new overloading rule, please see
https://github.com/riscv/rvv-intrinsic-doc/commit/82aac7dad4c6c1c351ed5b17ca6007c395843ed7

Changed:
1. Rename `generic` to `overloaded` because the new rule is not using C11 generic.
2. Change HasGeneric to HasNoMaskedOverloaded because all masked operations
   support overloading api.
3. Add more overloaded tests due to overloading rule changed.

Differential Revision: https://reviews.llvm.org/D99189

For example,

<https://lab.llvm.org/buildbot/#/builders/132/builds/3929>

has this diagnostic:

```
/opt/gcc/9.3.0/snos/include/g++/bits/stl_tree.h:780:8: error: static assertion failed: comparison object must be invocable as const
  780 |        is_invocable_v<const _Compare&, const _Key&, const _Key&>,
      |        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```

In input dump annotations, `check:2'1` indicates diagnostic 1 for the
`CHECK` directive on check file line 2.  Without this patch,
`-dump-input` computes the diagnostic index with the assumption that
FileCheck *consecutively* produces all diagnostics for the same
pattern.  Already, that can be a false assumption, as in the examples
below.  Moreover, it seems like a brittle assumption as FileCheck
evolves.  Finally, it actually complicates the implementation even if
it makes it slightly more efficient.

This patch avoids that assumption.  Examples below show results after
applying this patch.  Before applying this patch, `'N` is omitted
throughout these examples because the implementation doesn't notice
there's more than one diagnostic per pattern.

First, `CHECK-LABEL` violates the assumption because `CHECK-LABEL`
tries to match twice, and other directives can match in between:

```
$ cat check
CHECK: foobar
CHECK-LABEL: foobar

$ FileCheck -vv check < input |& tail -8
<<<<<<
           1: text
           2: foobar
label:2'0     ^~~~~~
check:1       ^~~~~~
label:2'1           X error: no match found
           3: text
>>>>>>
```

Second, `--implicit-check-not` is obviously processed many times among
other directives:

```
$ cat check
CHECK: foo
CHECK: foo

$ FileCheck -vv -dump-input=always -implicit-check-not=foo \
            check < input |& tail -16
<<<<<<
            1: text
not:imp1'0     X~~~~
            2: foo
check:1        ^~~
not:imp1'1        X
            3: text
not:imp1'1     ~~~~~
            4: foo
check:2        ^~~
not:imp1'2        X
            5: text
not:imp1'2     ~~~~~
            6:
eof:2          ^
>>>>>>
```

Reviewed By: thopre, jhenderson

Differential Revision: https://reviews.llvm.org/D97813

IR values convert to check prefix FileCheck variables for IR checks. For example, nameless values, e.g., %0, convert to check prefix TMP FileCheck variables, e.g., [[TMP0:%.*]]. This check prefix may clash with named values that have the same name and that causes auto-generated tests to fail. Currently a warning is emitted to change the names of the IR values but this is not always possible, if for example they are generated by clang. Manual intervention to fix the FileCheck variable names is too tedious. This patch add a parameter to prefix conflicting FileCheck variable names with a user-provided string to automate the process.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D99415

In future patches I will be setting the IsText parameter frequently so I will refactor the args to be in the following order. I have removed the FileSize parameter because it is never used.

```
  static ErrorOr<std::unique_ptr<MemoryBuffer>>
  getFile(const Twine &Filename, bool IsText = false,
          bool RequiresNullTerminator = true, bool IsVolatile = false);

  static ErrorOr<std::unique_ptr<MemoryBuffer>>
  getFileOrSTDIN(const Twine &Filename, bool IsText = false,
                 bool RequiresNullTerminator = true);

 static ErrorOr<std::unique_ptr<MB>>
 getFileAux(const Twine &Filename, uint64_t MapSize, uint64_t Offset,
            bool IsText, bool RequiresNullTerminator, bool IsVolatile);

  static ErrorOr<std::unique_ptr<WritableMemoryBuffer>>
  getFile(const Twine &Filename, bool IsVolatile = false);
```

Reviewed By: jhenderson

Differential Revision: https://reviews.llvm.org/D99182

Relates to: https://reviews.llvm.org/D97107

This reverts commit 50fd426f
and tweaks things for the reland: SystemZAsmLexer is now
SystemZAsmLexerTests.