Jordan Rupprecht 6d33362daf [libcxx][atomic] Fix failure mapping in compare_exchange_{strong,weak}. ... https://eel.is/c++draft/atomics.types.operations#23 says: ... the value of failure is order except that a value of `memory_order::acq_rel` shall be replaced by the value `memory_order::acquire` and a value of `memory_order::release` shall be replaced by the value `memory_order::relaxed`. This failure mapping is only handled for `_LIBCPP_HAS_GCC_ATOMIC_IMP`. We are seeing bad code generation for `compare_exchange_strong(cmp, 1, std::memory_order_acq_rel)` when using libc++ in place of libstdc++: https://godbolt.org/z/v3onrrq4G. This was caught by tsan tests after D99434, `[TSAN] Honor failure memory orders in AtomicCAS`, but appears to be an issue in non-tsan code. Reviewed By: ldionne, dvyukov Differential Revision: https://reviews.llvm.org/D103846		2021-06-15 07:55:23 -07:00
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configs	[libc++] Enable tests for the experimental library by default	2021-06-02 18:39:27 -04:00
libcxx	[libc++] Add a CI configuration for the modular build	2021-06-08 13:32:08 -04:00
std	[libcxx][atomic] Fix failure mapping in compare_exchange_{strong,weak}.	2021-06-15 07:55:23 -07:00
support	[libc++] NFC: More refactoring in the prev/next/advance tests per review comments	2021-06-14 08:42:44 -04:00
CMakeLists.txt	[libc++] Switch a few CI jobs to the minimal Lit configuration	2021-05-20 10:46:59 -04:00
lit.cfg.py	[libc++] Allow specifying custom Lit config files	2020-06-18 10:06:04 -04:00