A video decoder is configured to obtain an index value for a current video block. The video decoder obtains a partition type for a current video block. The video decoder selects one of a plurality of defined sets of ordered candidate predictive video blocks based on the partition type of the current video block. A video decoder selects a predictive video block from a selected one of the plurality of defined sets of ordered candidate predictive video blocks based on an index value. A video decoder generates a motion vector for a current video block based on motion information of the predictive video block.