| commit | 035cac0842e5d0e3886be0442100b10d15bf1be7 | [log] [tgz] |
|---|---|---|
| author | Sergio Afonso <safonsof@amd.com> | Tue Apr 15 16:59:18 2025 +0100 |
| committer | Sergio Afonso <safonsof@amd.com> | Thu May 15 12:36:15 2025 +0100 |
| tree | f2991cbeb5851ba084934e387f80c379532bff27 | |
| parent | 0cd7e8aa911dd4d0d6f4c43bef28fd853cf929f5 [diff] |
[Flang][OpenMP] Minimize host ops remaining in device compilation This patch updates the function filtering OpenMP pass intended to remove host functions from the MLIR module created by Flang lowering when targeting an OpenMP target device. Host functions holding target regions must be kept, so that the target regions within them can be translated for the device. The issue is that non-target operations inside these functions cannot be discarded because some of them hold information that is also relevant during target device codegen. Specifically, mapping information resides outside of `omp.target` regions. This patch updates the previous behavior where all host operations were preserved to then ignore all of those that are not actually needed by target device codegen. This, in practice, means only keeping target regions and mapping information needed by the device. Arguments for some of these remaining operations are replaced by placeholder allocations and `fir.undefined`, since they are only actually defined inside of the target regions themselves. As a result, this set of changes makes it possible to later simplify target device codegen, as it is no longer necessary to handle host operations differently to avoid issues.
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