[PATCH] D106450: [InstCombine] Fold (gep (oneuse(gep Ptr, Idx0)), Idx1) -> (gep Ptr, (add Idx0, Idx1)) (PR51069)
Roman Lebedev via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Jul 22 07:21:24 PDT 2021
lebedev.ri added a comment.
FWIW i think the obvious generalization here is that only the outer GEP needs to have two operands,
we just need to fold it's index operand into the last operand of inner one-use GEP:
https://alive2.llvm.org/ce/z/UTBPnG
Or the other way around: the previous GEP could have only two operands,
and then we just need to fold it into the first index:
https://alive2.llvm.org/ce/z/xWVW8J
But i guess these aren't really interesting for the select-of-gep's, outside of the bigger pattern at least.
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