[clangd] Use unique_function for config handlers (#203008)
`ConfigYAML.cpp`'s `DictParser` owns its callbacks for one parse and
never copies them, so this replaces `std::function` with move-only
`llvm::unique_function` and removes the unused copy machinery for each
lambda.
In a matched Release AArch64 build, `ConfigYAML.cpp.o` shrank by 94,560
bytes, stripped clangd shrank by 16,848 bytes, unstripped clangd shrank
by 82,512 bytes, and dyld fixups fell by 336.
Validated with the 16 `ParseYAML` unit tests and `clangd --check`; 12
paired runs of 100,000 parses improved mean user CPU time by 3.46% (95%
CI: 1.31% to 5.61%).
Work towards #202616
AI tool disclosure: Co-authored with OpenAI Codex.
[clang][Sema] Fix rejected-valid for explicit object parameters in dependent nested classes context (#209107)
In #89078, we banned explicit object parameters from several invalid
contexts. This patch proposes we relax the restriction and allow
entering contexts so that nested classes can be visited correctly.
Close #136472
[CodeGen][NPM] Disable Machine verifier at the end of default pipelines (#208357)
keeping discussions in https://github.com/llvm/llvm-project/pull/176693.
Adds target option to disable machine verifier at the end of default
pilelines (O0,O1..). Also ref.
https://github.com/llvm/llvm-project/pull/201004 for discussions
regarding why this is required (temporarily atleast) so that NPM
migration is unblocked. should be removed once we have fixed all the
latent verifier issues.
[AMDGPU][GlobalISel] Select s16 G_MERGE_VALUES into wider scalars (#207999)
With real-true16 (default on `gfx11`/`gfx12`), a scalar `s16` is a
register type, so the `G_MERGE_VALUES` legality rule started accepting
scalar merges built from `s16` pieces, e.g. `s64 = G_MERGE_VALUES(4 x
s16)`. The instruction selector has no pattern for that shape. So this
aborts with `cannot select` on something like:
```mlir
define amdgpu_kernel void @k(ptr %p) {
store i136 0, ptr %p, align 8
ret void
}
```
Make it selectable rather than restricting legalization: Pack pairs of
`s16` with `S_PACK_LL_B32_B16` then `REG_SEQUENCE`.
Assisted-by: Claude
Signed-off-by: Keshav Vinayak Jha <keshavvinayakjha at gmail.com>
[Support] Treat Windows "NUL" as the null device in writeToOutput (#208179)
llvm-objcopy (via writeToOutput) only special-cased "/dev/null", so on
Windows an output path of "NUL" fell through to TempFile::create() +
rename. Windows reserves "NUL" as a device name, so the rename fails
with "permission denied". This broke clang-offload-bundler's SYCL fat
object step when the driver is invoked with `-o nul` in downstream test
https://github.com/intel/llvm/blob/sycl/sycl/test/include_deps/header_reach.cpp
Assisted by: Claude
