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522d679e59
As reported in https://reviews.llvm.org/D83101#2133062 the new visitInsertElementInst()/visitExtractElementInst() functionality is causing miscompiles (previously-crashing test added) It is due to the fact how the infra of Scalarizer is dealing with DCE, it was not updated or was it ready for such scalar value forwarding. It always assumed that the moment we "scalarized" something, it can go away, and did so with prejudice. But that is no longer safe/okay to do. Instead, let's prevent it from ever shooting itself into foot, and let's just accumulate the instructions-to-be-deleted in a vector, and collectively cleanup (those that are *actually* dead) them all at the end. All existing tests are not reporting any new garbage leftovers, but maybe it's test coverage issue. |
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