Nathan Chancellor reported a crash due to commit
3466e007 (Reland "[Attr] support btf_type_tag attribute").

The following test can reproduce the crash:
  $ cat efi.i
  typedef unsigned long efi_query_variable_info_t(int);
  typedef struct {
    struct {
      efi_query_variable_info_t __attribute__((regparm(0))) * query_variable_info;
    };
  } efi_runtime_services_t;
  efi_runtime_services_t efi_0;
  $ clang -m32 -O2 -g -c -o /dev/null efi.i

The reason is that FunctionTypeLoc.getParam(Idx) may return a
nullptr which should be checked before dereferencing the
result pointer. This patch fixed this issue.

This makes it easy to write tests where the irrelevant fields are not needed.

Fix a dangling else that gcc-11 warned about. The EXPECT_EQ macro
expands to an if-else, so the whole construction contains a hidden
dangling else.

Differential Revision: https://reviews.llvm.org/D113346

Add a variant of getEquivalentICmp() that produces an optional
offset. This allows us to create an equivalent icmp for all ranges.

Use this in the with.overflow folding code, which was doing this
adjustment separately -- this clarifies that the fold will indeed
always apply.

As described in https://bugs.llvm.org/show_bug.cgi?id=52429 this
fold is incorrect, because inbounds only guarantees that the
pointers don't wrap in the unsigned space: It is possible that
the sign boundary is crossed by an object.

I'm dropping the fold entirely rather than adjusting it, because
computePointerICmp() fully subsumes it (just with correct predicate
handling).

Differential Revision: https://reviews.llvm.org/D113343

The public API for this functionality is forgetValue(). There was
only one call from LoopVectorize, which was directly next to a
forgetValue() call and as such redundant.

While this isn't what we eventually need (i8 or i1),
approaching from this end is more straight-forward.

Added omp.sections and omp.section operation according to the
section 2.8.1 of OpenMP Standard 5.0.

Reviewed By: kiranchandramohan

Differential Revision: https://reviews.llvm.org/D110844

This finally creates proper test coverage for replication shuffles,
that are used by LV for conditional loads, and will allow to add
proper costmodel at least for AVX512.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D113324

Hiding it in `getInterleavedMemoryOpCost()` is problematic for a number of reasons,
including testability and reuse, let's do better.

In a followup `getUserCost()` will be taught to use to to estimate the mask costs,
which will allow for better cost model tests for it.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D113313

This diff snuck into the unrelated:
025a2f73

It's a suggested follow-up for D113212, but I need to add test
coverage first.

umax(X, Op1) - Op1 --> usub.sat(X, Op1)

https://alive2.llvm.org/ce/z/HpcGiJ

This happens in 2 or more steps with an icmp-select idiom
instead of an intrinsic. This is another step towards
canonicalization of the min/max intrinsics. See:
D98152

Turning on `enable_noundef_analysis` flag allows better codegen by removing freeze instructions.
I modified clang by renaming `enable_noundef_analysis` flag to `disable-noundef-analysis` and turning it off by default.

Test updates are made as a separate patch: D108453

Reviewed By: eugenis

Differential Revision: https://reviews.llvm.org/D105169

[Clang/Test]: Rename enable_noundef_analysis to disable-noundef-analysis and turn it off by default (2)

This patch updates test files after D105169.
Autogenerated test codes are changed by `utils/update_cc_test_checks.py,` and non-autogenerated test codes are changed as follows:

(1) I wrote a python script that (partially) updates the tests using regex: {F18594904} The script is not perfect, but I believe it gives hints about which patterns are updated to have `noundef` attached.

(2) The remaining tests are updated manually.

Reviewed By: eugenis

Differential Revision: https://reviews.llvm.org/D108453

Resolve lit failures in clang after 8ca4b3ef's land

Fix lit test failures in clang-ppc* and clang-x64-windows-msvc

Fix missing failures in clang-ppc64be* and retry fixing clang-x64-windows-msvc

Fix internal_clone(aarch64) inline assembly

The structured bindings decomposition of a non-dependent array in a dependent context (a template) were, upon instantiation, creating nested OpaqueValueExprs that would trigger assertions in CodeGen. Additionally the OpaqueValuesExpr's contained SourceExpr is being emitted in CodeGen, but there was no code for its transform in template instantiation. This would trigger other assertions such as when emitting a DeclRefExpr that refers to a VarDecl that is not marked as ODR-used.

This is all based on cursory deduction, but with the way the code flows from SemaTemplateInstantiate back to SemaInit, it is apparent that the nesting of OpaqueValueExpr is unintentional.

This commit fixes https://bugs.llvm.org/show_bug.cgi?id=45964 and possible other issues involving OpaqueValueExprs in template instantiations might be resolved.

Reviewed By: aaron.ballman, rjmccall

Differential Revision: https://reviews.llvm.org/D108482

It's availible from GLIBC 2.33
Fixes use-of-uninitialized-value llvm/lib/Support/Unix/Path.inc:467:29 in llvm::sys::fs::remove(llvm::Twine const&, bool)

The files in compile-commands.json can potentially include duplicates.
Change run-clang-tidy.py so that it does not run on the duplicate entries.

Differential Revision: https://reviews.llvm.org/D112926

Revert "[Clang/Test]: Rename enable_noundef_analysis to disable-noundef-analysis and turn it off by default"

This reverts commit 7584ef76.

Turning on `enable_noundef_analysis` flag allows better codegen by removing freeze instructions.
I modified clang by renaming `enable_noundef_analysis` flag to `disable-noundef-analysis` and turning it off by default.

Test updates are made as a separate patch: D108453

Reviewed By: eugenis

Differential Revision: https://reviews.llvm.org/D105169

Make sure that every case has its own lexical block.

Don't set the OS when computing supported architectures in
PlatformDarwin::ARMGetSupportedArchitectureAtIndex.

Differential revision: https://reviews.llvm.org/D113159

Matching a recent clang change I've made, now 'int[3]' is formatted
without the space between the type and array bound. This commit updates
libDebugInfoDWARF/llvm-dwarfdump to match that formatting.

Remove the nested switches from the ARMGetSupportedArchitectureAtIndex
implementation.

Differential revision: https://reviews.llvm.org/D113155

This reverts commit 3255578e.

Failed buildbot's Armv7 builds:
https://lab.llvm.org/buildbot/#/builders/60/builds/5303

This patch abstracts VWholeLoad* classes into VWholeLoadN, simplifies
existing code as well as fixes a typo.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D109319

This patch refactors classes for load/store of V extension by:
- Introduce new class for VUnitStrideLoadFF and VUnitStrideSegmentLoadFF
  so that uses of L/SUMOP* are not spread around different places.
- Reorder classes for Unit-Stride load/store in line with table
  describing lumop/sumop in riscv-v-spec.pdf.

Reviewed By: HsiangKai, craig.topper

Differential Revision: https://reviews.llvm.org/D109318

This patch fixes:

  mlir/lib/Dialect/SparseTensor/Transforms/SparseTensorConversion.cpp:124:3:
  error: default label in switch which covers all enumeration values
  [-Werror,-Wcovered-switch-default]

by removing the default case.

Previously we assume there're some non-executing sections at the bottom of the text section so that we won't hit the array's bound. But on BOLTed binary, it turned out .bolt section is at the bottom of text section which can be profiled, then it crash llvm-profgen. This change try to fix it.

Reviewed By: hoy, wenlei

Differential Revision: https://reviews.llvm.org/D113238