XMVectorReciprocalSqrt function (directxmath.h)

Article
02/22/2024

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

Syntax

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

Parameters

[in] V

Vector whose reciprocal square root is computed.

Return value

Returns a vector. Each component is 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

Note that due to implementation details, VMX128 returns QNaN in all special cases.

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)