[PATCH] D106450: [InstCombine] Fold (gep (oneuse(gep Ptr, Idx0)), Idx1) -> (gep Ptr, (add Idx0, Idx1)) (PR51069)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

In D106450#2952679 <https://reviews.llvm.org/D106450#2952679>, @alexfh wrote:

> @RKSimon we've discovered that this commit is causing substantial performance regressions (~11% runtime) of some of our benchmarks on different x86 microarchitectures (haswell, skylake). @wmi is trying to get an isolated test.

OK - do you know offhand if its another CSE / loop invariant screwup?


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