This pass isn't used anywhere and thus has no test coverage. Remove it
for these reasons.

For whatever reason, there was no entry in
`llvm/include/llvm/LinkAllPasses.h` to remove.

This pass isn't used anywhere and thus has no test coverage. For these
reasons, remove it.

This legacy pass isn't used anywhere and there is no test coverage, so
at this point it should be removed.

This patch extends TransferReadDropUnitDimsPattern to support dropping
unit dims from partially-static memrefs, for example:

%v = vector.transfer_read %base[%c0, %c0], %pad {in_bounds = [true, true]} :
  memref<?x1xi8, strided<[?, ?], offset: ?>>, vector<[16]x1xi8>

Is rewritten as:

%dim0 = memref.dim %base, %c0 : memref<?x1xi8, strided<[?, ?], offset: ?>>
%subview = memref.subview %base[0, 0] [%dim0, 1] [1, 1] :
  memref<?x1xi8, strided<[?, ?], offset: ?>> to memref<?xi8, #map1>
%v = vector.transfer_read %subview[%c0], %pad {in_bounds = [true]}
  : memref<?xi8, #map1>, vector<[16]xi8>

Scalable vectors are now also supported, the scalable dims were being
dropped when creating the rank-reduced vector type. The xfer op can also
have a mask of type 'vector.create_mask', which gets rewritten as long
as the mask of the unit dim is a constant of 1.

The change implements lowering of `get_fpenv`, `set_fpenv` and
`reset_fpenv`.

Differential Revision: https://reviews.llvm.org/D81843

PowerPC AIX backend does not support float128 at all. Diagnose even when
specifying -mfloat128 to avoid backend crash.

---------

Co-authored-by: Kai Luo <gluokai@gmail.com>

This reverts commit e2fb816c.
It breaks TestLinuxCore.py on lldb-*-windows. See buildbot below:
https://lab.llvm.org/buildbot/#/builders/219/builds/7014

It's always guaranteed to be valid since we compute it ourselves from MI.
This should simplify an upcoming change in #72352

The property we're explicitly looking for is whether or not MI only cares about
VL zeroness and not VL itself, so we can just use DemandedFields for this. This
should simplify an upcoming change in #72352

If there are two 'or' instructions concat variables in opposite order
and the first 'or' dominates the second one, the second 'or' can be
optimized to fshl to rotate shift first 'or'. This can eliminate an shl
and expose more optimization opportunity for bswap/bitreverse.

InitUndef pass need replace the implicit def with Undef pseudo, but
current remove method will make noreg2implicit borken.

This patch postpone the removal until all basicblock be processed.

The code that calculates the flexible array member size is big enough to
warrant its own method.

Some subtargets of PPC don't support `isel` instruction, early-ifcvt
should not insert this instruction.

Also fixed some existing test cases.

Fixed #57305.
Fixed #58251.

Fixed #72751.

Fixed #72785.

This reverts commit 4323da92.

This broke building libffi for ARM on Windows (and probably Darwin),
where one extern function intentionally falls through to another
one, while sharing one CFI region.

As long as one isn't using .subsections_via_symbols on MachO,
this probably shouldn't be a hard error.

Secondly, the tested pattern only produces an error on MachO and
COFF targets, but not for ELF, making the error case even more
inconsistent.

Reverting this commit for now, to figure out the best way forward.

This matches what PowerPC and X86 do.

This reverts commit aa6be2f7.

Some tests for the obsoleted NaCl misuse the -e for linking.

Three transforms (all commutative):
https://alive2.llvm.org/ce/z/Bc-nh4

Closes #71309

Recommit "[DAGCombiner] Transform `(icmp eq/ne (and X,C0),(shift X,C1))` to use rotate or to getter constants." (2nd Try)

Added missing check that the mask and shift amount added up to correct
bitwidth as well as test cases for the bug.

Closes #71729

This combine was previously adding instruction in some cases (see the
tests).

Closes #72767

Alive2: https://alive2.llvm.org/ce/z/gqeaVo

Related patch:
https://github.com/llvm/llvm-project/commit/31d219d2997fed1b7dc97e0adf170d5aaf65883e

This allows us to also check the constraints during constant evaluation.

This reverts commit 99ee2db1.

It's causing ICEs in the ARM tests. See the comment here:

https://github.com/llvm/llvm-project/commit/99ee2db198d86f685bcb07a1495a7115ffc31d7e

I swore I copied the if statement from somewhere, but whatever I did to
it while moving it over dropped one of the equals signs. This patch
fixes that so the action will actually work properly.

Currently, the scorecard action runs on forks. This means that every
recent fork will be periodically running a job that doesn't really make
a lot of sense to run outside the main monorepo. This patch fixes that
by restricting the job to only run in the monorepo.

/llvm-project/clang/lib/CodeGen/CGObjCGNU.cpp:3674:15: error: variable 'selStructPtrTy' set but not used [-Werror,-Wunused-but-set-variable]
  llvm::Type *selStructPtrTy = SelectorTy;
              ^
1 error generated.