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77 lines
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<title>Registers - GNU Compiler Collection (GCC) Internals</title>
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<a name="Registers"></a>
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Next: <a rel="next" accesskey="n" href="Register-Classes.html#Register-Classes">Register Classes</a>,
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Previous: <a rel="previous" accesskey="p" href="Type-Layout.html#Type-Layout">Type Layout</a>,
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Up: <a rel="up" accesskey="u" href="Target-Macros.html#Target-Macros">Target Macros</a>
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<h3 class="section">17.7 Register Usage</h3>
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<p><a name="index-register-usage-4044"></a>
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This section explains how to describe what registers the target machine
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has, and how (in general) they can be used.
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<p>The description of which registers a specific instruction can use is
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done with register classes; see <a href="Register-Classes.html#Register-Classes">Register Classes</a>. For information
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on using registers to access a stack frame, see <a href="Frame-Registers.html#Frame-Registers">Frame Registers</a>.
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For passing values in registers, see <a href="Register-Arguments.html#Register-Arguments">Register Arguments</a>.
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For returning values in registers, see <a href="Scalar-Return.html#Scalar-Return">Scalar Return</a>.
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<ul class="menu">
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<li><a accesskey="1" href="Register-Basics.html#Register-Basics">Register Basics</a>: Number and kinds of registers.
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<li><a accesskey="2" href="Allocation-Order.html#Allocation-Order">Allocation Order</a>: Order in which registers are allocated.
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<li><a accesskey="3" href="Values-in-Registers.html#Values-in-Registers">Values in Registers</a>: What kinds of values each reg can hold.
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<li><a accesskey="4" href="Leaf-Functions.html#Leaf-Functions">Leaf Functions</a>: Renumbering registers for leaf functions.
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<li><a accesskey="5" href="Stack-Registers.html#Stack-Registers">Stack Registers</a>: Handling a register stack such as 80387.
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</ul>
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