[PATCH] DAGCombiner: don't duplicate (fmul x, c) when folding fneg if fneg is free

[Matthias Braun]

I would say the hasOneUse() check makes sense even in the TLI.isFNegFree() == false case (it's not TLI.NegIsWayMoreExpensiveThanMul() after all).


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  rL LLVM

http://reviews.llvm.org/D10277

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