dfma (sm5 - asm)
Performs a fused-multiply add.
| dfma[_sat] dest[.mask], [-]src0[_abs][.swizzle], [-]src1[_abs][.swizzle],[-]src2[_abs][.swizzle] |
|---|
| Item | Description |
|---|---|
| dest |
[in] The address of the result of the operation. The result value must be accurate to 0.5 ULP. dest = src0 * src1 + src2 |
| src0 |
[in] The components to multiply with src1. |
| src1 |
[in] The components to multiply with src0. |
| src2 |
[in] The components to add tosrc0 * src1. |
Remarks
Shaders that use this instruction will be marked with a shader flag that will cause them to fail to bind unless all the following conditions are met.
- The system supports DirectX 11.1.
- The system includes a WDDM 1.2 driver.
- The driver reports support for this instruction via D3D11_FEATURE_DATA_D3D11_OPTIONS.ExtendedDoublesShaderInstructions set to TRUE.
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 |