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Unsigned integer subtract with borrow.
| usubb dst0[.mask], dst1[.mask], src0[.swizzle], src1[.swizzle] |
|---|
| Item | Description |
|---|---|
| dst0 |
[in] Contains the LSAB results of the instruction. |
| dst1 |
[in] The corresponding component of dst0 that specifies if a borrow was produced. |
| src0 |
[in] The value from which to subtract. |
| src1 |
[in] The amount to subtract from src0. |
Remarks
This instruction performs a component-wise unsigned subtract of 32-bit operands src1 from src0, placing the LSB part of the 32-bit result in dst0.
The corresponding component in dst1 is written with 1 if a borrow is produced, 0 otherwise.
dst1 can be NULL if the borrow is not needed.
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 |