gas/testsuite/gas/aarch64/system-4-invalid.s

/* Armv8.7-a DSB memory nXS barrier variant.  */
.arch armv8.7-a

    dsb #17
    dsb #18
    dsb #19

    dsb #21
    dsb #22
    dsb #23

    dsb #25
    dsb #26
    dsb #27

    dsb #29