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Commit 3668bde3 authored by Craig Topper's avatar Craig Topper
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[DAGCombiner] Teach DAG combine that inserting an extract_subvector result... 

[DAGCombiner] Teach DAG combine that inserting an extract_subvector result into the same location of a an undef vector can just use the original input to the extract.

llvm-svn: 294932
parent 680c73e7
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