[PATCH] D24011: [ConstantFold] Add a flag for ppc_fp128 constant folding, since APFloat doesn't support double-double semantic

[Tim Shen via llvm-commits]

timshen created this revision.
timshen added reviewers: hfinkel, kbarton, echristo, iteratee.
timshen added a subscriber: llvm-commits.
Herald added subscribers: nemanjai, mehdi_amini.

There is a FIXME in APFloat that is saying ppc_fp128 is supported through IEEE 128 bits semantic, not IBM double-double semantic. Add a flag to turn of the constand folding to leave the computation to runtime.

https://reviews.llvm.org/D24011

Files:
  llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  llvm/lib/IR/ConstantFold.cpp
  llvm/test/CodeGen/PowerPC/ppc128-constant-folding.ll

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