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Commit 0d66d296 authored by Simon Pilgrim's avatar Simon Pilgrim
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[SelectionDAG] Early out from computeKnownBits when we know we will have no common bits. 

Avoid extra (recursive) calls to computeKnownBits if we already know that there are no common known bits.

llvm-svn: 290490
parent 23dd4c37
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