James Molloy e9d50dc9f7 Compute demanded bits for icmp instructions ...

Instead of bailing out when we see an icmp, we can instead at least
say that if the upper bits of both operands are known zero, they are
not demanded. This doesn't help with signed comparisons, but it's at
least better than bailing out.

llvm-svn: 249687

2015-10-08 12:40:06 +00:00

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