[LLVMdev] SCEV bottom value

[Preston Briggs]

I'd like a value, call it Bottom, such that

SE->getAddExpr(Bottom, X) => Bottom
SE->getMulExpr(Bottom, X,) => Bottom
isKnownPredicate(any, Bottom, X) => false
etc.


I can write code to make NULL work like I want, but it would be simpler if
something was already defined. I'm wondering about SCEV::Unknown.  The
documentation suggests I could perhaps use it for a "bottom" value.

Think it would work?

Thanks,
Preston
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