[PATCH] D61419: Support FNeg constant folding

[Cameron McInally via Phabricator via llvm-commits]

cameron.mcinally created this revision.
cameron.mcinally added reviewers: spatel, arsenm, kpn, andrew.w.kaylor, craig.topper.
Herald added subscribers: llvm-commits, hiraditya, wdng.
Herald added a project: LLVM.

Also, fix `ConstantExpr::getFNeg(...)` so that it actually returns an `FNeg(X)`, not an `FSub(-0.0, X)`.


Repository:
  rL LLVM

https://reviews.llvm.org/D61419

Files:
  llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  llvm/lib/IR/ConstantFold.cpp
  llvm/lib/IR/ConstantFold.h
  llvm/lib/IR/Constants.cpp
  llvm/test/CodeGen/X86/fp-fold.ll
  llvm/test/CodeGen/X86/vec_fneg.ll
  llvm/test/Transforms/InstCombine/fneg.ll
  llvm/test/Transforms/InstCombine/fsub.ll
  llvm/test/Transforms/InstCombine/inselt-binop.ll
  llvm/test/Transforms/Reassociate/crash2.ll
  llvm/unittests/IR/ConstantsTest.cpp

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