[PATCH] D27294: Factor out common parts of LVI and Float2Int into ConstantRange [NFCI]

[Philip Reames via Phabricator via llvm-commits]

reames created this revision.
reames added reviewers: jmolloy, sanjoy, apilipenko.
reames added a subscriber: llvm-commits.
Herald added a subscriber: mcrosier.

This just extracts out the transfer rules for constant ranges into a single shared point.  As it happens, neither bit of code actually overlaps in terms of the handled operators, but with this change that could easily be tweaked in the future.

I also want to have this separated out to make experimenting with a eager value info implementation and possibly a ValueTracking-like fixed depth recursion peephole version.  There's no reason all four of these can't share a common implementation which reduces the chances of bugs.


https://reviews.llvm.org/D27294

Files:
  include/llvm/IR/ConstantRange.h
  lib/Analysis/LazyValueInfo.cpp
  lib/IR/ConstantRange.cpp
  lib/Transforms/Scalar/Float2Int.cpp

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