static inline int vmsvga_fifo_length ( struct vmsvga_state_s * s ) {
 int num ;
 if ( ! s -> config || ! s -> enable ) {
 return 0 ;
 }
 num = CMD ( next_cmd ) - CMD ( stop ) ;
 if ( num < 0 ) {
 num += CMD ( max ) - CMD ( min ) ;
 }
 return num >> 2 ;
 }
static inline int vmsvga_fifo_length ( struct vmsvga_state_s * s ) {
 int num ;
 if ( ! s -> config || ! s -> enable ) {
 return 0 ;
 }
 num = CMD ( next_cmd ) - CMD ( stop ) ;
 if ( num < 0 ) {
 num += CMD ( max ) - CMD ( min ) ;
 }
 return num >> 2 ;
 }