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Commit 6d5f120c authored by Dan Gohman's avatar Dan Gohman
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Generalize the new code in instcombine's ComputeNumSignBits for handling 

and/or to handle more cases (such as this add-sitofp.ll testcase), and
port it to selectiondag's ComputeNumSignBits.

llvm-svn: 51469
parent 30499844
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