[AArch64] Prevent reuse of retired architecture names
Add explicit lists of retired AArch64 feature and system register names,
with TableGen validation preventing future definitions from reusing them.
This preserves names previously exposed by LLVM after their architectural
features or registers have been withdrawn or removed. Add coverage for
target features, architecture extension names and aliases, architectural
FEAT_* names, and system registers.
Revert "[CodeGen] Use RegisterClassInfo for remaining allocation-order users" (#221749)
Reverts llvm/llvm-project#216510
breaks tests MIOpen/CK shard 1-4 in CI
queueing this up in case we want to save a bit of time
[SCEV] Add test coverage for ext-nusw/nsuw inference (#218943)
Complete the existing incorrect-nsw test, showing that zext-addrec nusw
is not implied by nw on the pre-inc AR, and that sext-addrec nsuw is not
implied by nw on the pre-inc AR. See also: #217405 and #217362.
Assisted-by: AI
[offload][omp] Remove data_fence
All supported backends execute enqueued work on a given queue in
submission order (CUDA, AMDGPU, and Host queues are always in-order;
Level Zero's default and non-default in-order/synchronous command
modes are as well), so the explicit data-fence used to order a
pointer-attachment after prior data transfers is unnecessary. Remove
the DeviceTy/GenericDeviceTy/GenericPluginTy dataFence chain and the
now-unused olQueueBarrier liboffload API added to support it.
[SimplifyCFG] Preserve !unpredictable when forming a switch (#221580)
SimplifyCFG turns a chain of equality comparisons into a switch in two
places, performValueComparisonIntoPredecessorFolding() and
simplifyBranchOnICmpChain(), and neither propagated !unpredictable. The
hint was therefore dropped even though it is valid on a switch and the
reverse transform, simplifySwitchOfCmpIntrinsic(), already preserves it.
Propagate the metadata in both. Folding a comparison into a predecessor
merges two decisions into a single switch, so the result is only marked
unpredictable when both of the folded comparisons were. That also makes
chains longer than two blocks work: the fold runs once per predecessor
and reads the metadata back off the switch it built on the previous
iteration.
simplifyBranchOnICmpChain() also emits a range check instead of a switch
when the case values are contiguous. That branch is an exact replacement
for the original one, so it inherits the metadata unconditionally, and
the flag now survives into the machine IR.
Fixes #42658.
[libc] Add cpp::swap and cpp::clamp utilities (#221236)
Added cpp::swap to src/__support/CPP/utility/swap.h with move semantics
and array support, and cpp::clamp to src/__support/CPP/algorithm.h with
comparator support.
Included unit tests in swap_test.cpp and algorithm_test.cpp.
Adopted the new utilities in initial callsites:
* stdlib: Used cpp::swap in qsort_data.h
* wctype: Used cpp::swap in perfect_hash_map.h
* math: Used cpp::clamp in powf.h
* scanf_core: Used cpp::min and cpp::max in parser.h
Also fixed sign extension when parsing scanset specifiers in parser.h:
signed characters greater than or equal to 128 produced negative values,
inverting comparisons and causing out-of-bounds writes in the bitset.
Scanset characters are now cast through uint8_t, and non-ASCII tests
were added to parser_test.cpp.
Assisted-by: Automated tooling, human reviewed.
