[clang] implement CWG2064: ignore value dependence for decltype
The 'decltype' for a value-dependent (but non-type-dependent) should be known,
so this patch makes them non-opaque instead.
This patch also implements what's neceessary to allow overloading
on pure differences in instantiation dependence, making `std::void_t`
usable for SFINAE purposes.
This also readds a few test cases from da98651, which was a previous attempt
at resolving CWG2064.
Fixes #8740
Fixes #61818
Fixes #190388
[Flang][OpenMP][Offload] Add Flang offload tests for common block and declare target (#202949)
This PR adds a couple of tests revolving around the usage of common
block with declare target in Fortran OpenMP.
[AArch64][LV] Cost low-VF interleaved access (#205844)
Adds a case to getInterleavedMemoryOpCost to cost scalable interleaved
memory accesses where the interleave factor is larger than the VF.
Previously for these cases, memory operations would be costed as
individual gathers and scatters, which may result in the LoopVectorizer
choosing a wider VF than necessary.
This changes proposes an alternative approach of using a contiguous
load/store of the interleaved vector followed by shuffles to get
the elements into place.
[libc++][ThreadSafety] Add thread safety annotations for variadic std::scoped_lock (#204462)
The thread safety annotations on std::scoped_lock were previously only
applied to the empty and single-mutex specializations. The general
variadic specialization carried no annotations, so -Wthread-safety
considered none of the mutexes held inside a multi-mutex scoped_lock
block and reported the guarded data accessed there as unprotected.
Now that Clang supports pack expansion inside thread safety attributes
(landed for Clang 21), annotate the variadic scoped_lock with
acquire_capability/requires_capability on its constructors,
release_capability on its destructor, and scoped_lockable on the class.
Fixes #42000.
Co-authored-by: Anthony Calandra <anthony at anthony-calandra.com>
[OpenMP] Remove internal linkage from __kmp_wait template (NFC) (#207983)
__kmp_wait in kmp_dispatch.h is a static function template in a header,
so any TU that includes it without instantiating it trips
-Wunused-template (kmp_runtime.cpp, kmp_affinity.cpp, kmp_global.cpp,
kmp_settings.cpp). It is used by kmp_dispatch.cpp and
kmp_dispatch_hier.h. Drop static, which the comment above it already
suggests.
Part of #202945
[SLP] Retune look-ahead scores for constants
Rescale LookAheadHeuristics scores and add ScoreSameConstants /
ScoreConstantScaleFactor so identical constants no longer score the
same as same-opcode instruction matches, fixing suboptimal operand
reordering around repeated constants (shift amounts, splat values).
Also retry a SplitVectorize alt-shuffle build for copyable-element
bundles when scheduling fails, instead of always falling back to a
gather, to fix regressions.
Reviewers: hiraditya, bababuck, RKSimon
Pull Request: https://github.com/llvm/llvm-project/pull/207548
[AMDGPU] Clear DS aggregate in inverted sched_barrier mask when LDSDMA allowed (#207779)
The DS clause was missing the LDSDMA check that the VMEM clause has
PPC: Remove manual run of machine verifier
This is redundant with using the standard -verify-machineinstrs.
It's also confusing / worse, since the error is not produced to
stderr.
[SLP] Drop nsw when mul by INT_MIN is converted to shl
mul nsw X, INT_MIN is valid, but shl X, BW-1 is not nsw-safe. Drop nsw on
the vector shl when a mul lane with INT_MIN is unified into shl during
opcode interchange.
Fixes #207990
Reviewers:
Pull Request: https://github.com/llvm/llvm-project/pull/208028
[clang][Sema][NFC] Improve readability in `computeDeclContext` (#208010)
Split off from #190495.
Co-authored-by: Matheus Izvekov <mizvekov at gmail.com>
[libc][stdfix] Fix idiv* doc table, rename idivfx test helpers and remove duplicate bitsuk source (#206729)
Two small cleanups in libc/src/stdfix.
1. `idiv*` in `stdfix.rst` was marked as implemented for all 12 type
variants but only the 8 non-short width variants (ur, r, ulr, lr, uk, k,
ulk, lk) exist in the directory and are built. Updated the table to
match.
2. Removed `bitusk.cpp` which is an orphaned duplicate of `bitsuk.cpp`
with a typo in the file name. It isn't referenced in the CMakeLists.txt
and has no corresponding .h file.
3. Rename the idivfx test header and helpers.
[clang][X86] Emit AVX level mismatch psABI warnings on function definitions (#199091)
Emit -WpsABI for x86_64 function definitions whose return type or
parameter type uses a vector wider than 128 bits without the required
ABI feature enabled. 256-bit vectors require avx, and 512-bit vectors
require avx512f.
Previously this diagnostic was only emitted at call sites, so
definitions with wide vector signatures could be introduced without a
warning until they were called. Use the function feature map so
attribute(target("avx/avx512f")) definitions are accepted, and emit no
warnings for prototype-only declarations.
[AArch64][llvm] Allow +hcx to be specified as optional for Armv8.6
The `HCRX_EL2` system register can be accessed if FEAT_HCX is
implemented, and is optional from Armv8.6 (and mandatory in Armv8.7).
Allow `clang -march=armv8.6-a+hcx` by making FeatureHCX an
optional argument.
[clang] implement CWG2064: ignore value dependence for decltype
The 'decltype' for a value-dependent (but non-type-dependent) should be known,
so this patch makes them non-opaque instead.
This patch also implements what's neceessary to allow overloading
on pure differences in instantiation dependence, making `std::void_t`
usable for SFINAE purposes.
This also readds a few test cases from da98651, which was a previous attempt
at resolving CWG2064.
Fixes #8740
Fixes #61818
Fixes #190388
[libc] Fix build failure with ASSUME_ROUND_NEAREST_ONLY (#207991)
Commit 03c62ca40d19ba0 moved some local variables of
`convert_float_hex_exp` into a struct called `properties`, but didn't
edit the #ifdef branch for `LIBC_MATH_HAS_ASSUME_ROUND_NEAREST_ONLY`, so
builds with that definition failed.
