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InstSimplify should do all transformations that ConstProp does, but one thing that ConstProp does that InstSimplify wouldn't is inline vector instructions that are constants, e.g. into a ret. Previously vector instructions wouldn't be inlined in InstSimplify because llvm::Simplify*Instruction() would return nullptr for specific instructions, such as vector instructions that were actually constants, if it couldn't simplify them. This changes SimplifyInsertElementInst, SimplifyExtractElementInst, and SimplifyShuffleVectorInst to return a vector constant when possible. Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D85946 |
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