[PATCH] D112283: [Instcombine] Try to get select's FMFs from its operands

[Usman Nadeem via Phabricator via llvm-commits]

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This tries to tackle https://bugs.llvm.org/show_bug.cgi?id=52259

Intersect the FMF of the select's operands. If the operand is not a `FPMathOperator` e.g. an argument then try to take the flag from the function's attributes.


https://reviews.llvm.org/D112283

Files:
  llvm/include/llvm/IR/Operator.h
  llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
  llvm/test/Transforms/InstCombine/minmax-fold.ll
  llvm/test/Transforms/PhaseOrdering/fmf-select-abs.ll

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