| GNU Compiler Collection (GCC) Internals: Registers |
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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. |