* [Fix] Suppress spurious __syncthreads() between T.ws blocks (#2192) and add T.named_barrier_arrive (#2188)
Issue #2192 - BugFix: Unexpected CTA-wide __syncthreads() between T.ws producer/consumer
- Root cause: FindConflict() in thread_storage_sync.cc did not check for mutually
exclusive thread constraints. When T.ws(0) (tx<128) reads and T.ws(1) (tx>=128)
writes the same shared buffer, no thread satisfies both constraints, so no
__syncthreads() is needed — mbarriers already handle the synchronization.
- Fix: add mutual-exclusivity check (prove NOT(P AND C)) early in FindConflict().
If the access constraints are mutually exclusive (disjoint thread sets), return
false (no conflict) immediately, before any index-range analysis.
- Measured improvement: barrierpipe_stage2 gemm latency 44ms → 25ms on H200.
Issue #2188 - Feature: expose native T.named_barrier_arrive(barrier_id, thread_count)
- Adds tl.named_barrier_arrive intrinsic op (bar.arrive PTX, one-sided arrive).
- Registers op in builtin.cc, declares in builtin.h.
- Adds tl::__named_barrier_arrive<id, cnt>() template in common.h.
- Adds codegen case in codegen_cuda.cc.
- Exposes T.named_barrier_arrive() in tilelang/language/builtin.py.
- Adds regression test testing/python/issue/test_tilelang_issue_2188_2192.py.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* lint: clang-format + ruff fixes after #2188/#2192 changes
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* test: simplify issue 2188/2192 test, keep only #2192, add requires_cuda
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* [Fix] Make named_barrier_arrive accept variable barrier_id/thread_count
* Update documentation for named barriers and remove obsolete test file
- Clarified documentation for `named_barrier_arrive` in `builtin.h` and `builtin.py` to specify the barrier index range.
- Removed obsolete regression test for issues #2188 and #2192 as it is no longer needed.
* lint fix
---------
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: LeiWang1999 <leiwang1999@outlook.com>
