[PATCH] D39240: Improve clamp recognition in ValueTracking.

[Artur Gainullin via Phabricator via llvm-commits]

ArturGainullin created this revision.
Herald added a subscriber: jholewinski.

ValueTracking was recognizing not all variations of clamp. Swapping of
true value and false value of select was added to fix this problem. We
break canonical form only for clamp pattern recognition. The first patch
was reverted because it caused miscompile in NVPTX target. Added
corresponding test cases.


https://reviews.llvm.org/D39240

Files:
  lib/Analysis/ValueTracking.cpp
  test/CodeGen/NVPTX/minmax-negative.ll
  test/Transforms/InstCombine/minmax-fold.ll

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