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ppc64le - Fix deviation in floating point values caused by FMA #91

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ppc64le - Fix deviation in floating point values caused by FMA #91

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4 changes: 2 additions & 2 deletions s2/latlng.go
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Original file line number Diff line number Diff line change
Expand Up @@ -64,15 +64,15 @@ func (ll LatLng) Distance(ll2 LatLng) s1.Angle {
lng1, lng2 := ll.Lng.Radians(), ll2.Lng.Radians()
dlat := math.Sin(0.5 * (lat2 - lat1))
dlng := math.Sin(0.5 * (lng2 - lng1))
x := dlat*dlat + dlng*dlng*math.Cos(lat1)*math.Cos(lat2)
x := float64(dlat*dlat) + float64(dlng*dlng*math.Cos(lat1)*math.Cos(lat2))
return s1.Angle(2*math.Atan2(math.Sqrt(x), math.Sqrt(math.Max(0, 1-x)))) * s1.Radian
}

// NOTE(mikeperrow): The C++ implementation publicly exposes latitude/longitude
// functions. Let's see if that's really necessary before exposing the same functionality.

func latitude(p Point) s1.Angle {
return s1.Angle(math.Atan2(p.Z, math.Sqrt(p.X*p.X+p.Y*p.Y))) * s1.Radian
return s1.Angle(math.Atan2(p.Z, math.Sqrt(float64(p.X*p.X)+float64(p.Y*p.Y)))) * s1.Radian
}

func longitude(p Point) s1.Angle {
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