[PATCH] D60947: [ConstantRange] Add getNonEmpty() constructor

[Nikita Popov via Phabricator via llvm-commits]

nikic created this revision.
nikic added a reviewer: lebedev.ri.
Herald added subscribers: llvm-commits, sanjoy, hiraditya.
Herald added a project: LLVM.

ConstantRanges have an annoying special case: If upper and lower are the same, it can be either an empty or a full set. When constructing constant ranges nearly always a full set is intended. This requires an explicit check in many places.

This revision adds a `getNonEmpty()` constructor that disambiguates this case: If upper and lower are the same, a full set is created.


Repository:
  rL LLVM

https://reviews.llvm.org/D60947

Files:
  llvm/include/llvm/IR/ConstantRange.h
  llvm/lib/Analysis/ScalarEvolution.cpp
  llvm/lib/Analysis/ValueTracking.cpp
  llvm/lib/IR/ConstantRange.cpp

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