This section explains how to describe what registers the target machine has, and how (in general) they can be used.
The description of which registers a specific instruction can use is done with register classes; see Register Classes. For information on using registers to access a stack frame, see Frame Registers. For passing values in registers, see Register Arguments. For returning values in registers, see Scalar Return.
|• Register Basics:||Number and kinds of registers.|
|• Allocation Order:||Order in which registers are allocated.|
|• Values in Registers:||What kinds of values each reg can hold.|
|• Leaf Functions:||Renumbering registers for leaf functions.|
|• Stack Registers:||Handling a register stack such as 80387.|