[PATCH] D86364: [ValueTracking] Interpret GEPs as a series of adds multiplied by the related scaling factor

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

A couple special cases might improve performance:

1. Check for and skip zero array indexes, similar to the special case for zero struct indexes, since they show up frequently.
2. Accumulate constant indexes separately from variable ones: you can compute the sum of the constant indexes, and computeForAddSub with the result, instead of using computeForAddSub on each index.
3. Add a special case for computeForAddSub on a constant; the arithmetic is a bit simpler.


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  https://reviews.llvm.org/D86364/new/

https://reviews.llvm.org/D86364