20.17 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.

20.17.1 Defining Attributes and their Values		Specifying attributes and their values.
20.17.2 Attribute Expressions		Valid expressions for attribute values.
20.17.3 Assigning Attribute Values to Insns		Assigning attribute values to insns.
20.17.4 Example of Attribute Specifications		An example of assigning attributes.
20.17.5 Computing the Length of an Insn		Computing the length of insns.
20.17.6 Constant Attributes		Defining attributes that are constant.
20.17.7 Delay Slot Scheduling		Defining delay slots required for a machine.
20.17.8 Specifying Function Units		Specifying information for insn scheduling.