XMVectorSqrtEst

Estimates the per-component square root of a vector.

Syntax

XMVECTOR XMVectorSqrtEst(
         XMVECTOR V
)

Parameters

V
Type: XMVECTOR

Vector whose square root is estimated.

Return value

Type: XMVECTOR

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

Remarks

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

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

Note that due to implementation details, VMX128 returns -Infinity in this case instead of the standard 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.

Requirements

Header: Declared in directxmath.h.