# Pastebin N4krZShA
/* RDVL X\nx, #\imm */
.macro _sve_rdvl nx, imm
        _check_general_reg \nx
        _check_num (\imm), -0x20, 0x1f
        .inst   0x04bf5000                      \
                | (\nx)                         \
                | (((\imm) & 0x3f) << 5)
.endm