Instruction Attributes

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.

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