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If the PHI-of-ops simplifies to an existing value, no real PHI is created, which means the dependencies between the PHI-of-ops and its operands is not materialized in IR. At the moment, we fail to create a real PHI node for the PHI-of-ops, because the PHI-of-ops root instruction is not re-visited if one of the PHI-of-ops operands changes. We need to add the operands as additional users in this case. Even with this patch, there are still some dependencies missing. I will continue tackling the outstanding reporeted crashes in this area. Fixes PR36501, PR42422, PR42557. Reviewed By: asbirlea Differential Revision: https://reviews.llvm.org/D66924 |
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