|Microsoft DirectX 9.0|
Multiply the value by two before using it in the instruction.
Source register. For more about register types, see Registers - ps_1_X.
The contents of the register are not changed. The modifier is applied only to the data read from the register.
This modifier is mutually exclusive with Invert, so it cannot be applied to the same register.
This modifier is only available to arithmetic instructions in version 1_4.