jfb updated this revision to Diff 280135. jfb added a comment. Improve documentation
Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D79279/new/ https://reviews.llvm.org/D79279 Files: clang/docs/LanguageExtensions.rst Index: clang/docs/LanguageExtensions.rst =================================================================== --- clang/docs/LanguageExtensions.rst +++ clang/docs/LanguageExtensions.rst @@ -2454,6 +2454,14 @@ * Implement an atomic memory with atomic operations of a particular size, similar to that presented in C++ proposal [p1478](https://wg21.link/p1478). +When using the `_Atomic` qualifier, the memory will be accessed with a sequence +of operations of size equal to or a multiple of the pointer's element size. The +order of operations is unspecified, and has unordered atomic semantics. This +means that reads and writes do not tear at the individual element level, and +they each occur exactly once, but the order in which they occur can only be +guaranteed using appropriate fences. Atomic memory operations must be to memory +locations which are aligned to no less than the element size. + Atomic Min/Max builtins with memory ordering --------------------------------------------
Index: clang/docs/LanguageExtensions.rst =================================================================== --- clang/docs/LanguageExtensions.rst +++ clang/docs/LanguageExtensions.rst @@ -2454,6 +2454,14 @@ * Implement an atomic memory with atomic operations of a particular size, similar to that presented in C++ proposal [p1478](https://wg21.link/p1478). +When using the `_Atomic` qualifier, the memory will be accessed with a sequence +of operations of size equal to or a multiple of the pointer's element size. The +order of operations is unspecified, and has unordered atomic semantics. This +means that reads and writes do not tear at the individual element level, and +they each occur exactly once, but the order in which they occur can only be +guaranteed using appropriate fences. Atomic memory operations must be to memory +locations which are aligned to no less than the element size. + Atomic Min/Max builtins with memory ordering --------------------------------------------
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