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93 lines
3.8 KiB
HTML
93 lines
3.8 KiB
HTML
4 years ago
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<html lang="en">
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<title>Stack Registers - GNU Compiler Collection (GCC) Internals</title>
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<meta name="description" content="GNU Compiler Collection (GCC) Internals">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Registers.html#Registers" title="Registers">
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<link rel="prev" href="Leaf-Functions.html#Leaf-Functions" title="Leaf Functions">
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Copyright (C) 1988-2015 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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(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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</head>
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<body>
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<div class="node">
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<a name="Stack-Registers"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="Leaf-Functions.html#Leaf-Functions">Leaf Functions</a>,
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Up: <a rel="up" accesskey="u" href="Registers.html#Registers">Registers</a>
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<hr>
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</div>
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<h4 class="subsection">17.7.5 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>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><span class="file">reg-stack.c</span></samp> and write your machine description to cooperate
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with it, as well as defining these macros.
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<div class="defun">
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— Macro: <b>STACK_REGS</b><var><a name="index-STACK_005fREGS-4094"></a></var><br>
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<blockquote><p>Define this if the machine has any stack-like registers.
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</p></blockquote></div>
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<div class="defun">
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— Macro: <b>STACK_REG_COVER_CLASS</b><var><a name="index-STACK_005fREG_005fCOVER_005fCLASS-4095"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Macro: <b>FIRST_STACK_REG</b><var><a name="index-FIRST_005fSTACK_005fREG-4096"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Macro: <b>LAST_STACK_REG</b><var><a name="index-LAST_005fSTACK_005fREG-4097"></a></var><br>
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<blockquote><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></blockquote></div>
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</body></html>
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