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Commit c702fc0e authored by Dan Gohman's avatar Dan Gohman
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Make GetMinTrailingZeros a member function of ScalarEvolution, 

so that it can access the TargetData member (when available) and
use ValueTracking.h information to compute information for
SCEVUnknown Values.

Also add GetMinLeadingZeros and GetMinSignBits functions,
with minimal implementations.

llvm-svn: 73794
parent cc31110b
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