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The OpenACC standard specifies an `atomic` construct in section 2.12 (of 3.3 spec), used to ensure that a specific location is accessed or updated atomically. Four different clauses are allowed: `read`, `write`, `update`, or `capture`. If no clause appears, it is as if `update` is used. The OpenMP specification defines the same clauses for `omp atomic`. The types of expression and the clauses in the OpenACC spec match the OpenMP spec exactly. The main difference is that the OpenMP specification is a superset - it includes clauses for `hint` and `memory order`. It also allows conditional expression statements. But otherwise, the expression definition matches. Thus, for OpenACC, we refactor and reuse the OpenMP implementation as follows: * The atomic operations are duplicated in OpenACC dialect. This is preferable so that each language's semantics are precisely represented even if specs have divergence. * However, since semantics overlap, a common interface between the atomic operations is being added. The semantics for the interfaces are not generic enough to be used outside of OpenACC and OpenMP, and thus new folders were added to hold common pieces of the two dialects. * The atomic interfaces define common accessors (such as getting `x` or `v`) which match the OpenMP and OpenACC specs. It also adds common verifiers intended to be called by each dialect's operation verifier. * The OpenMP write operation was updated to use `x` and `expr` to be consistent with its other operations (that use naming based on spec). The frontend lowering necessary to generate the dialect can also be reused. This will be done in a follow up change. |
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| python | ||
| test | ||
| tools | ||
| unittests | ||
| utils | ||
| .clang-format | ||
| .clang-tidy | ||
| CMakeLists.txt | ||
| LICENSE.TXT | ||
| README.md | ||
Multi-Level Intermediate Representation
See https://mlir.llvm.org/ for more information.