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Take the absolute value of a source operand used in an arithmetic operation.
| _abs |
|---|
This modifier is used for single and double precision floating point and instructions only. The _abs modifier forces the sign of the number(s) on the source operand positive, including on INF values.
Applying _abs on NaN preserves NaN, although the particular NaN bit pattern that results is not defined.
When _abs is combined with the negate modifier, the combination forces the sign to be negative, as if the _abs modifier is applied first, then the negate.
Minimum Shader Model
This modifier 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 |
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