MathF.ReciprocalSqrtEstimate(Single) Method
Definition
Important
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Returns an estimate of the reciprocal square root of a specified number.
public:
static float ReciprocalSqrtEstimate(float x);public static float ReciprocalSqrtEstimate (float x);static member ReciprocalSqrtEstimate : single -> singlePublic Shared Function ReciprocalSqrtEstimate (x As Single) As SingleParameters
- x
- Single
The number whose reciprocal square root is to be estimated.
Returns
An estimate of the reciprocal square root x.
Remarks
On x86/x64 hardware this may use the RSQRTSS instruction which has a maximum relative error of 1.5 * 2^-12.
On ARM64 hardware this may use the FRSQRTE instruction which performs a single Newton-Raphson iteration.
On hardware without specialized support, this may just return 1.0 / Sqrt(x).
Applies to
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