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2016 Nov 11
2
RFC: Add atomic versions of the llvm.memcpy, llvm.memmove and llvm.memset intrinsics
...To be more specific here is the definition I'm thinking about:
declare void @llvm.memcpy_atomic.p0i8.p0i8.i32(i8* <dest>, i8* <src>, i32 <num_elements>,
i32 <element_size>, i32 <align>, i1 <isvolatile>)
It closelly mimicks original memcpy intrinsic. Only difference is that now we explicitly
specify element_size. Semantically memcpy_atomic is equivalent to the explicit IR loop
in which each load and store is marked as unordered atomic. This definition should give
sufficient freedom to the optimizer while allow...