[PATCH] D136201: [InstCombine] Handle PHI nodes when eliminating constant memcpy

[Anshil Gandhi via Phabricator via llvm-commits]

gandhi21299 added a comment.

@nikic Since alloca instructions are iterated more than once, shouldn't the `Worklist` under `PointerReplacer` remove instructions that have already been //replaced// (new instruction inserted without removing the old instruction)? The first function goes through a strange transformation when opaque pointers are used, where the `replace(Instruction&)` function is called on a GEP instruction which was already replaced in a previous instruction. This somehow causes the removal of the new GEP instruction.


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  https://reviews.llvm.org/D136201/new/

https://reviews.llvm.org/D136201