Florian Hahn 126f90b252 [DAGCombine] Poison-prove scalarizeExtractedVectorLoad. ...

extractelement is poison if the index is out-of-bounds, so just
scalarizing the load may introduce an out-of-bounds load, which is UB.

To avoid introducing new UB, we can mask the index so it only contains
valid indices.

Fixes PR50382.

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D103077

2021-05-30 11:40:55 +01:00

504 B

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