Cameron Zwarich 4c82cd21ed 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

2011-02-25 01:11:01 +00:00

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