[PATCH] D143195: ValueTracking: Add start of computeKnownFPClass API

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: spatel, jcranmer-intel, nikic, andrew.w.kaylor, sepavloff, kpn, scanon.
Herald added subscribers: StephenFan, hiraditya.
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arsenm requested review of this revision.
Herald added a subscriber: wdng.
Herald added a project: LLVM.

Add a new compute-known-bits like function to compute all
the interesting floating point properties at once.

      

Eventually this should absorb all the various floating point
queries we already have.

The operators on FPClassTest should really go with the definition in FloatingPointMode.h 
and are reusable in InstCombine; they're where they are to avoid merge pain for myself in 
some of my other patches backed up in review


https://reviews.llvm.org/D143195

Files:
  llvm/include/llvm/ADT/FloatingPointMode.h
  llvm/include/llvm/Analysis/ValueTracking.h
  llvm/lib/Analysis/ValueTracking.cpp
  llvm/unittests/Analysis/ValueTrackingTest.cpp

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