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release/18.x: [LV,LAA] Don't vectorize loops with load and store to invar address. #91092

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release/18.x: [LV,LAA] Don't vectorize loops with load and store to invar address. #91092

wants to merge 1 commit into from

Commits on May 9, 2024

  1. [LV,LAA] Don't vectorize loops with load and store to invar address. 

    Code checking stores to invariant addresses and reductions made an
incorrect assumption that the case of both a load & store to the same
invariant address does not need to be handled.

In some cases when vectorizing with runtime checks, there may be
dependences with a load and store to the same address, storing a
reduction value.

Update LAA to separately track if there was a store-store and a
load-store dependence with an invariant addresses.

Bail out early if there as a load-store dependence with invariant
address. If there was a store-store one, still apply the logic checking
if they all store a reduction.

(cherry picked from commit b54a78d)
    @fhahn @AreaZR
    fhahn authored and AreaZR committed May 9, 2024
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