Re-introduce the patch that was reverted previously.
In the first attempt, the checks would not be able to
read from the global option, since getLocalOrGlobal
only works with string types. Additional logic is needed
in order to support both use cases in the transition
period. All that logic will be removed when the local
options are fully removed.

We have a number of checks designed to analyze problems
in header files only, for example:

bugprone-suspicious-include
google-build-namespaces
llvm-header-guard
misc-definitions-in-header
...

All these checks duplicate the same logic and options
to determine whether a location is placed in the main
source file or in the header. More checks are coming
up with similar requirements.

Thus, to remove duplication, let's move this option
to the top-level configuration of clang-tidy (since
it's something all checks should share).

Add a deprecation notice for all checks that use the
local option, prompting to update to the global option.

Differential Revision: https://reviews.llvm.org/D142655

This reverts commit b6eed9a8.

This should fix https://github.com/rust-lang/rust/issues/107681.

Return undefined to a noundef return value is undefined.

Example:

```
define noundef i32 @test_ret_noundef(i1 %cond) {
entry:
  br i1 %cond, label %bb1, label %bb2
bb1:
  br label %bb2
bb2:
  %r = phi i32 [ undef, %entry ], [ 1, %bb1 ]
  ret i32 %r
}
```

Differential Revision: https://reviews.llvm.org/D144319

TypeSystemClang.cpp:4855:13: error: enumeration value 'WasmExternRef' not handled in switch [-Werror,-Wswitch]

Differential Revision: https://reviews.llvm.org/D144344

These correspond to islessgreater and it inverse.

Currently, MlirTranslateMain only executes one of the requested translations, and does not error if multiple are specified. This commit enables translations to be chained in the specified order.

This makes round-trip tests easier, since existing import/export passes can be reused and no combined round-trip passes have to be registered (example: mlir-translate  -serialize-spirv -deserialize-spirv).

Additionally, by leveraging TranslateRegistration with file-to-file TranslateFunctions, generic pre- and post-processing can be added before/after conversion to/from MLIR.

Reviewed By: lattner, Mogball

Differential Revision: https://reviews.llvm.org/D143719

Instead of special casing Zfa in the custom inserters, select the
correct instructions during isel.

BuildPairF64 we can do with pattern, but SplitF64 requires custom
selection due to the two destinations.

If we didn't need SplitF64 without Zfa, I would have an extract low
and extract high ISD opcode for Zfa to avoid that issue.

Given this transformation: X % Y -> X - (X / Y) * Y

This patch strips off the poison-generating flag of X / Y such as exact, because it may make the optimized form result poison whereas X % Y does not.

The issue was reported here: https://github.com/llvm/llvm-project/issues/60748

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D144333

"unsigned long" can be 8 bytes, but the code assumes 4.

This this the real root cause D122215 was reverted.

Reviewed By: fhahn

Differential Revision: https://reviews.llvm.org/D144316

Breaks bots
https://lab.llvm.org/buildbot/#/builders/236/builds/2349
https://lab.llvm.org/buildbot/#/builders/74/builds/17361
https://lab.llvm.org/buildbot/#/builders/168/builds/11972

This reverts commit 7be55b00.

Given concat(zip1(a, b), zip2(a, b)), we can convert that to a 128bit zip1(a, b)
if we widen a and b out first.

Fixes #54226

Differential Revision: https://reviews.llvm.org/D121088

Add cases for the following ops:
    - 0-X            -- https://alive2.llvm.org/ce/z/6C75Li
    - bitreverse(X)  -- https://alive2.llvm.org/ce/z/SGG1q9
    - bswap(X)       -- https://alive2.llvm.org/ce/z/p7pzwh
    - ctpop(X)       -- https://alive2.llvm.org/ce/z/c5y3BC
    - abs(X)         -- https://alive2.llvm.org/ce/z/yxXGz_
                        https://alive2.llvm.org/ce/z/rSRg4K
    - uadd_sat(X, Y) -- https://alive2.llvm.org/ce/z/Zw-y4W
                        https://alive2.llvm.org/ce/z/2NRqRz
                        https://alive2.llvm.org/ce/z/M1OpF8

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D142828

Add cases for the following ops:
    - 0-X
    - bitreverse(X)
    - bswap(X)
    - ctpop(X)
    - abs(X)
    - uadd_sat(X, Y)

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D142827

[ValueTracking] Add KnownBits patterns `xor(x, x - 1)` and `and(x, -x)` for knowing upper bits to be zero

These two BMI pattern will clear the upper bits of result past the
first set bit. So if we know a single bit in `x` is set, we know that
`results[bitwidth - 1, log2(x) + 1] = 0`.

Alive2:
blsmsk: https://alive2.llvm.org/ce/z/a397BS
blsi: https://alive2.llvm.org/ce/z/tsbQhC

Differential Revision: https://reviews.llvm.org/D142271

Differential Revision: https://reviews.llvm.org/D142270

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D142519

* Deployment Versions for targets
* Run Search Paths
* Text vs Data Segment attributes to symbols

Reviewed By: pete

Differential Revision: https://reviews.llvm.org/D144158

"TableGenBackends.h" has declarations of emitters.

The extending loads combine tries to prefer sign-extends folding into loads vs
zexts, and in cases where a G_ZEXTLOAD is first used by a G_ZEXT, and then used
by a G_SEXT, it would select the G_SEXT even though the load is already
zero-extending.

Fixes issue #59630

This reverts commit 5356fefc.

It looks like Polly still relies on the legacy SCCP pass. Bring it back
until the best way forward is determined.

While working on the formatter for the thread::id several minor issues
where spotted. This fixes them.

This is part of the optimization pipeline, of which the legacy pass manager version is deprecated.

Reviewed By: aeubanks

Differential Revision: https://reviews.llvm.org/D144201

This patch adds a subset of PowerPC intrinsics - fmadd,
fmsub, fnmadd and fnmsub.

Differential Revision: https://reviews.llvm.org/D143951

This is similar to ADRP and matches GNU objdump:

GNU objdump:
```
0000000000200100 <_start>:
  200100:    adr    x0, 201000 <_start+0xf00>
```

llvm-objdump (before patch):
```
0000000000200100 <_start>:
  200100:    adr    x0, #3840
```

llvm-objdump (after patch):
```
0000000000200100 <_start>:
  200100:    adr    x0, 0x201000 <_start+0xf00>
```

Reviewed By: simon_tatham, peter.smith

Differential Revision: https://reviews.llvm.org/D144079

This should fix https://github.com/rust-lang/rust/issues/107681.

Return undefined to a noundef return value is undefined.

Example:

```
define noundef i32 @test_ret_noundef(i1 %cond) {
entry:
  br i1 %cond, label %bb1, label %bb2
bb1:
  br label %bb2
bb2:
  %r = phi i32 [ undef, %entry ], [ 1, %bb1 ]
  ret i32 %r
}
```

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D144319

issue #60799
issue #60801

Reviewed By: #libc, philnik

Spies: Mordante, paulkirth, libcxx-commits

Differential Revision: https://reviews.llvm.org/D144307

Depends on D142808

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D143383