XMVectorSum function (directxmath.h)

Computes the horizontal sum of the components of an XMVECTOR. The horizontal sum is the result of adding each component in the vector together.

Syntax

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

Parameters

[in] V

Vector for which to compute the horizontal sum.

Return value

Returns a vector whose components are the horizontal sum of the components of V.

Remarks

Note that for SSE/SSE2, horizonal sums require a number of math and shuffle operations. If you enable SSE3 (via defining _XM_SSE3_INTRINSICS_, /arch:AVX, or /arch:AVX2) -or- if using Windows on ARM/ARM64, this function can make use of horizonal sum intrinsics.

This is new to DirectXMath 3.10

Requirements

See also

Vector Arithmetic Functions