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21.6 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 21.7 Register Classes. For information on using registers to access a stack frame, see 21.8.3 Registers That Address the Stack Frame. For passing values in registers, see 21.8.6 Passing Arguments in Registers. For returning values in registers, see 21.8.7 How Scalar Function Values Are Returned.

21.6.1 Basic Characteristics of Registers  Number and kinds of registers.
21.6.2 Order of Allocation of Registers  Order in which registers are allocated.
21.6.3 How Values Fit in Registers  What kinds of values each reg can hold.
21.6.4 Handling Leaf Functions  Renumbering registers for leaf functions.
21.6.5 Registers That Form a Stack  Handling a register stack such as 80387.

This document was generated by Charlie & on June, 17 2001 using texi2html