1. An apparatus, configured to execute first and second different types of graphics instructions, comprising: a first pipeline configured to execute the first type of graphics instruction but not the second type of graphics instruction, wherein the first pipeline is configured to execute the first type of graphics instruction in parallel for groups of graphics elements; and a second pipeline configured to execute the second type of graphics instruction but not the first type of graphics instruction, wherein the second pipeline is configured to execute the second type of graphics instruction in parallel for groups of graphics elements, wherein: the apparatus is configured to, in response to dispatch of an instruction of the second type to the second pipeline, mark a particular instruction of the first type in the first pipeline with information indicative of the dispatched instruction, wherein the particular instruction is a youngest valid instruction in the first pipeline that corresponds to the same group of graphics elements; and the apparatus is configured to stall performance of the dispatched instruction until a determination that none of a set of pipeline stages in the first pipeline store instructions that are marked with the information indicative of the dispatched instruction, indicating the first pipeline has completed execution of the marked particular instruction.