Registers

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Register Usage
==============

   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 See Register Classes.  For
information on using registers to access a stack frame, see *Note Frame
Registers::.  For passing values in registers, see *Note Register
Arguments::.  For returning values in registers, see *Note 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.
Obsolete Register Macros: Macros formerly used for the 80387.

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