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James Molloy 52b426c16a [ValueTracking] Teach isKnownNonZero a new trick
If the shifter operand is a constant, and all of the bits shifted out
are known to be zero, then if X is known non-zero at least one
non-zero bit must remain.

llvm-svn: 248508
2015-09-24 16:06:32 +00:00
..
2015-03-25 22:33:53 +00:00
2015-09-21 22:04:10 +00:00