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fma using BigFloats on Sys.iswindows()#49

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JeffreySarnoff wants to merge 3 commits intoJuliaMath:masterfrom
JeffreySarnoff:jas/fma
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fma using BigFloats on Sys.iswindows()#49
JeffreySarnoff wants to merge 3 commits intoJuliaMath:masterfrom
JeffreySarnoff:jas/fma

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@JeffreySarnoff
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After much consideration and some testing, since we are using MPFR's `fma`, it is appropriate to use 113 bits of precision.  FMA implementations (even on chip) do not really evaluate as if infinite bits of precision were available.
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@simonbyrne ^

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