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round_pi (sm4 - asm)

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Floating-point round to integral float.

round_pi[_sat] dest[.mask], [-]src0[_abs][.swizzle]
Item Description
dest
 [in] The address of the results of the operation.
src0
 [in] The components in the operation.

Remarks

This instruction performs a component-wise floating-point round of the values in src0, writing integral floating-point values to dest.

round_pi rounds towards +infinity, commonly known as ceil().

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

F means finite-real number.

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