Sanjay Patel 23019d1006 [ValueTracking, InstSimplify] extend isKnownNonZero() to handle vector constants ...

Similar in spirit to D20497 :
If all elements of a constant vector are known non-zero, then we can say that the
whole vector is known non-zero.

It seems like we could extend this to FP scalar/vector too, but isKnownNonZero()
says it only works for integers and pointers for now.

Differential Revision: http://reviews.llvm.org/D20544

llvm-svn: 270562

2016-05-24 14:18:49 +00:00

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