| commit | 6c3897d90eda4c39789ac9f4efa51db46734a249 | [log] [tgz] |
|---|---|---|
| author | Giuseppe Rossini <giuseppe.rossini@amd.com> | Tue Jul 02 17:12:33 2024 +0100 |
| committer | GitHub <noreply@github.com> | Tue Jul 02 17:12:33 2024 +0100 |
| tree | 60ae5326a5b02b9d45f12a5e630a7ca0755fdce4 | |
| parent | 123beb7926651217024e5db58b93ab9e8f3c77c7 [diff] |
Fix block merging (#96871) With this PR I am trying to address: https://github.com/llvm/llvm-project/issues/63230. What changed: - While merging identical blocks, don't add a block argument if it is "identical" to another block argument. I.e., if the two block arguments refer to the same `Value`. The operations operands in the block will point to the argument we already inserted - After merged the blocks, get rid of "unnecessary" arguments. I.e., if all the predecessors pass the same block argument, there is no need to pass it as an argument. - This last simplification clashed with `BufferDeallocationSimplification`. The reason, I think, is that the two simplifications are clashing. I.e., `BufferDeallocationSimplification` contains an analysis based on the block structure. If we simplify the block structure (by merging and/or dropping block arguments) the analysis is invalid . The solution I found is to do a more prudent simplification when running that pass. **Note**: many tests are still not passing. But I wanted to submit the code before changing all the tests (and probably adding a couple), so that we can agree in principle on the algorithm/design.
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