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[InstCombine] check alloc size in bitcast of geps fold (PR44321)
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Authored by spatel on Dec 20 2019, 8:12 AM.

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Summary

We missed a constraint in D44833 when folding a bitcast into a GEP with vector/array types.
If the alloc sizes specified by the datalayout don't match, this could miscompile as shown in:
https://bugs.llvm.org/show_bug.cgi?id=44321

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Event Timeline

spatel created this revision.Dec 20 2019, 8:12 AM
Herald added a project: Restricted Project. · View Herald TranscriptDec 20 2019, 8:12 AM
aqjune accepted this revision.Dec 20 2019, 10:50 AM
This revision is now accepted and ready to land.Dec 20 2019, 10:50 AM
This revision was automatically updated to reflect the committed changes.