label - ps
Mark the next instruction as having a label index.
where # identifies the label number.
For ps_2_x, the label number must be between between 0 and 15.
For ps_2_sw, ps_3_0, and ps_3_sw, the label number must be between between 0 and 2047.
|Pixel shader versions||1_1||1_2||1_3||1_4||2_0||2_x||2_sw||3_0||3_sw|
This instruction defines a label located at the next shader instruction. The label instruction can only be present directly after a ret instruction (which defines the end of the previous subroutine or main program).