rcp (sm5 - asm)

Component-wise reciprocal.

rcp[_sat] dest[.mask], [-]src0[_abs][.swizzle]
Item Description
dest
[in] The address of the results
dest = 1.0f / src0.
src0
[in] The number to take the reciprocal of.

Remarks

Use this instruction for reduced precision reciprocal, independent of the strict requirements for divide.

Maximum relative error is 2-21. (The error tolerance just matches rsq)

The following table shows the results obtained when executing the instruction with various classes of numbers.

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

This instruction applies to the following shader stages:

Vertex Hull Domain Geometry Pixel Compute
X X X X X X

Minimum Shader Model

This instruction is supported in the following shader models:

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

Shader Model 5 Assembly (DirectX HLSL)