Insn Attributes (GNU Compiler Collection (GCC) Internals) (original) (raw)

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16.20 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.

• Defining Attributes and their Values
• Attribute Expressions
• Assigning Attribute Values to Insns
• Example of Attribute Specifications
• Computing the Length of an Insn
• Constant Attributes
• Mnemonic Attribute
• Delay Slot Scheduling
• Specifying processor pipeline description