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XMVectorReciprocalSqrtEst function (directxmath.h)

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Estimates the per-component reciprocal square root of a vector.

Syntax

XMVECTOR XM_CALLCONV XMVectorReciprocalSqrtEst(
  [in] FXMVECTOR V
) noexcept;

Parameters

[in] V

Vector whose reciprocal square root is estimated.

Return value

Returns a vector. Each component is an estimate of the reciprocal square-root of the corresponding component of V.

Remarks

The reciprocal square-root operation handles special input values as follows.

Input Value Return Value
+Infinity 0
+0.0f +Infinity
-0.0f -Infinity
< 0.0f QNaN
 

Est functions offer increased performance at the expense of reduced accuracy. Est functions are appropriate for non-critical calculations where accuracy can be sacrificed for speed. The exact amount of lost accuracy and speed increase are platform dependent.

Platform Requirements

Microsoft Visual Studio 2010 or Microsoft Visual Studio 2012 with the Windows SDK for Windows 8. Supported for Win32 desktop apps, Windows Store apps, and Windows Phone 8 apps.

Requirements

Requirement Value
Target Platform Windows
Header directxmath.h (include DirectXMath.h)

See also

Vector Arithmetic Functions

XMVectorReciprocalSqrt