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According to PTX ISA .volatile has the same memory synchronization semantics as .relaxed.sys, so it can be used to implement monotonic atomic loads and stores. This is important for OpenMP's atomic construct where - 'read's and 'write's are lowered to atomic loads and stores, and - an update of float or double types are lowered into a cmpxchg loop. (Note that PTX could do better because it has atom.add.f{32,64} but LLVM's atomicrmw instruction only allows integer types.) Higher levels of atomicity (like acquire and release) need additional synchronization properties which were added with PTX ISA 6.0 / sm_70. So using these instructions still results in an error. Differential Revision: https://reviews.llvm.org/D50391 llvm-svn: 339316 |
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