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Commit 4c82cd21 authored by Cameron Zwarich's avatar Cameron Zwarich
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Set NumSignBits to 1 if KnownZero/KnownOne are being zero extended. In theory it 

is possible to do better if the high bit is set in either KnownZero/KnownOne, but
in practice NumSignBits is always 1 when we are zero extending because nothing
is known about that register.

llvm-svn: 126465
parent d2f3041c
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