[PATCH] D43761: [IPSCCP] Add getCompare which returns either true, false, undef or null.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: davide, mssimpso, dberlin.

getCompare returns true, false or undef constants if the comparison can
be evaluated, or nullptr if it cannot. This is in line with what
ConstantExpr::getCompare returns. It also allows us to use
ConstantExpr::getCompare for comparing constants.


https://reviews.llvm.org/D43761

Files:
  include/llvm/Analysis/ValueLattice.h
  lib/Transforms/Scalar/SCCP.cpp
  test/Transforms/SCCP/ip-constant-ranges.ll
  unittests/Analysis/ValueLatticeTest.cpp

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