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120 lines
4.8 KiB
HTML
120 lines
4.8 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Stack Registers (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Stack Registers (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Stack Registers (GNU Compiler Collection (GCC) Internals)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Registers.html#Registers" rel="up" title="Registers">
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<link href="Register-Classes.html#Register-Classes" rel="next" title="Register Classes">
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<link href="Leaf-Functions.html#Leaf-Functions" rel="prev" title="Leaf Functions">
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<style type="text/css">
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</style>
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</head>
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<body lang="en">
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<a name="Stack-Registers"></a>
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<div class="header">
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<p>
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Previous: <a href="Leaf-Functions.html#Leaf-Functions" accesskey="p" rel="prev">Leaf Functions</a>, Up: <a href="Registers.html#Registers" accesskey="u" rel="up">Registers</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Registers-That-Form-a-Stack"></a>
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<h4 class="subsection">18.7.5 Registers That Form a Stack</h4>
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<p>There are special features to handle computers where some of the
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“registers” form a stack. Stack registers are normally written by
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pushing onto the stack, and are numbered relative to the top of the
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stack.
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</p>
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<p>Currently, GCC can only handle one group of stack-like registers, and
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they must be consecutively numbered. Furthermore, the existing
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support for stack-like registers is specific to the 80387 floating
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point coprocessor. If you have a new architecture that uses
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stack-like registers, you will need to do substantial work on
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<samp>reg-stack.c</samp> and write your machine description to cooperate
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with it, as well as defining these macros.
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</p>
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<dl>
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<dt><a name="index-STACK_005fREGS"></a>Macro: <strong>STACK_REGS</strong></dt>
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<dd><p>Define this if the machine has any stack-like registers.
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</p></dd></dl>
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<dl>
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<dt><a name="index-STACK_005fREG_005fCOVER_005fCLASS"></a>Macro: <strong>STACK_REG_COVER_CLASS</strong></dt>
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<dd><p>This is a cover class containing the stack registers. Define this if
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the machine has any stack-like registers.
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</p></dd></dl>
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<dl>
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<dt><a name="index-FIRST_005fSTACK_005fREG"></a>Macro: <strong>FIRST_STACK_REG</strong></dt>
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<dd><p>The number of the first stack-like register. This one is the top
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of the stack.
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</p></dd></dl>
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<dl>
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<dt><a name="index-LAST_005fSTACK_005fREG"></a>Macro: <strong>LAST_STACK_REG</strong></dt>
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<dd><p>The number of the last stack-like register. This one is the bottom of
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the stack.
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</p></dd></dl>
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</body>
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</html>
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