In addition to describing the instruction supported by the target machine, the `md' file also defines a group of attributes and a set of values for each. Every generated insn is assigned a value for each attribute. One possible attribute would be the effect that the insn has on the machine's condition code. This attribute can then be used by NOTICE_UPDATE_CC to track the condition codes.
| Defining Attributes | Specifying attributes and their values. |
| Expressions | Valid expressions for attribute values. |
| Tagging Insns | Assigning attribute values to insns. |
| Attr Example | An example of assigning attributes. |
| Insn Lengths | Computing the length of insns. |
| Constant Attributes | Defining attributes that are constant. |
| Delay Slots | Defining delay slots required for a machine. |
| Function Units | Specifying information for insn scheduling. |