rsq (sm4 - asm)

Component-wise reciprocal square root.

rsq[_sat] dest[.mask], [-]src0[_abs][.swizzle]
Item Description
dest
[in] Contains the results of the operation.
dest = 1.0f / sqrt(src0)
src0
[in] The components for the operation.

Remarks

The maximum relative error is 2-21.

The following table shows the results obtained when executing the instruction with various classes of numbers, assuming that neither overflow or underflow occurs.

F means finite-real number.

src -inf -F -denorm -0 +0 +denorm +F +inf NaN
dest NaN NaN -inf -inf +inf +inf +F +0 NaN

This instruction applies to the following shader stages:

Vertex Shader Geometry Shader Pixel Shader
x x x

Minimum Shader Model

This function is supported in the following shader models.

Shader Model Supported
Shader Model 5 yes
Shader Model 4.1 yes
Shader Model 4 yes
Shader Model 3 (DirectX HLSL) no
Shader Model 2 (DirectX HLSL) no
Shader Model 1 (DirectX HLSL) no

Shader Model 4 Assembly (DirectX HLSL)