[flang][OpenMP] Check the context of the declare_simd directive (#209318)
OpenMP 6.0, 9.8 "declare_simd Directive", restricts the placement of the
directive:
Any declare_simd directive must appear in the specification part of a
subroutine subprogram, function subprogram, or interface body to which
it applies.
Flang did not enforce this, and accepted the directive in the
specification part of a module, submodule, main program or block data.
Note: the restriction requiring the argument to name the procedure to
which the directive applies is not implemented here.
Fixes #205478
[orc-rt] Make noDispatch test helper fail in -Asserts builds. (#209493)
noDispatch guards Sessions that must never dispatch a wrapper call, but
it did so with assert(false), which compiles out under NDEBUG.
Replace the assert with ADD_FAILURE(), which records a failure in every
build mode, and then complete the call via its Return continuation with
an out-of-band error. Completing the call means a caller awaiting the
result unblocks and fails too, rather than hanging, even when the
dispatch arrives on a non-test thread where ADD_FAILURE() alone may not
be observed.
Make ios_base::xalloc non-atomic with LIBCXX_ENABLE_THREADS=OFF. (#208356)
762b77a moved the definition of "xindex" out of the header, and in the
process dropped the _LIBCPP_HAS_THREADS check. Re-add the check to
maintain the status quo.
The discussion on https://github.com/llvm/llvm-project/pull/198994
indicates it's not clear whether LIBCXX_ENABLE_THREADS=OFF is actually
supposed to mean single-threaded. But it clearly does in practice:
atomic_support.h uses non-atomic ops when threads are disabled, and a
few other APIs have explicit non-atomic fallback paths.
My team ran into this trying to run libc++ tests for a RISC-V core
without the "a" extension.
[libc++] Compute a confidence interval in compare-benchmarks (#208090)
When comparing benchmark results with more than one sample per
benchmark, compute a confidence interval and flag rows that are
statistically significant. This should make the A/B comparison PR job
more robust to noise and easier to rely on. After this change, output
for a multi-sample run looks like:
```
Benchmark Baseline Candidate Difference % Difference Significant? 95% C.I. of %diff
------------------------------ ---------- ----------- ------------ -------------- -------------- -------------------
std::any_of(list<int>)/32 39.92 39.22 -0.70 -1.75% [-6.5%, +1.6%]
std::any_of(list<int>)/32768 54071.34 65395.51 11324.17 20.94% [-2.8%, +34.5%]
std::any_of(list<int>)/50 67.39 69.08 1.69 2.51% x [+0.2%, +4.7%]
std::any_of(list<int>)/8 7.21 6.46 -0.75 -10.40% x [-25.0%, -0.7%]
std::any_of(list<int>)/8192 21745.58 22299.32 553.74 2.55% [-20.3%, +38.4%]
std::any_of(vector<int>)/32 24.21 14.61 -9.60 -39.65% x [-41.2%, -38.4%]
std::any_of(vector<int>)/32768 24365.14 12498.21 -11866.93 -48.70% x [-48.9%, -48.6%]
Geomean 324.15 247.83 -76.32 -23.54%
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[SSAF] Add EntitySourceLocationsSummary and JSON format (#208841)
Adds a per-entity TU-level summary recording the canonical (file, line,
column) of each declaration registered against an entity. The data feeds
a follow-on whole-program analysis that groups entities sharing a
declaration source-location into equivalence classes.
Assisted-By: Claude Opus 4.7
[lldb-dap][test] Fix stackTrace test in symlink environment (#209595)
This test (edited in #209236) fails when run in an environment where
source files are symlinks. Using `realpath` breaks that, as we use the
path in assertions later. The var is already constructed as `source_file
= self.getSourcePath("main.c")` which should be sufficient for
`_RecurseSource()` to work.
