130 lines
6.0 KiB
HTML
130 lines
6.0 KiB
HTML
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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) 1988-2016 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 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using the GNU Compiler Collection (GCC): SH Built-in Functions</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): SH Built-in Functions">
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<meta name="keywords" content="Using the GNU Compiler Collection (GCC): SH Built-in Functions">
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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="Target-Builtins.html#Target-Builtins" rel="up" title="Target Builtins">
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<link href="SPARC-VIS-Built_002din-Functions.html#SPARC-VIS-Built_002din-Functions" rel="next" title="SPARC VIS Built-in Functions">
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<link href="S_002f390-System-z-Built_002din-Functions.html#S_002f390-System-z-Built_002din-Functions" rel="prev" title="S/390 System z Built-in 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" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="SH-Built_002din-Functions"></a>
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<div class="header">
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<p>
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Next: <a href="SPARC-VIS-Built_002din-Functions.html#SPARC-VIS-Built_002din-Functions" accesskey="n" rel="next">SPARC VIS Built-in Functions</a>, Previous: <a href="S_002f390-System-z-Built_002din-Functions.html#S_002f390-System-z-Built_002din-Functions" accesskey="p" rel="prev">S/390 System z Built-in Functions</a>, Up: <a href="Target-Builtins.html#Target-Builtins" accesskey="u" rel="up">Target Builtins</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="SH-Built_002din-Functions-1"></a>
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<h4 class="subsection">6.59.25 SH Built-in Functions</h4>
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<p>The following built-in functions are supported on the SH1, SH2, SH3 and SH4
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families of processors:
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</p>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005fset_005fthread_005fpointer"></a>Built-in Function: <em>void</em> <strong>__builtin_set_thread_pointer</strong> <em>(void *<var>ptr</var>)</em></dt>
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<dd><p>Sets the ‘<samp>GBR</samp>’ register to the specified value <var>ptr</var>. This is usually
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used by system code that manages threads and execution contexts. The compiler
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normally does not generate code that modifies the contents of ‘<samp>GBR</samp>’ and
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thus the value is preserved across function calls. Changing the ‘<samp>GBR</samp>’
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value in user code must be done with caution, since the compiler might use
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‘<samp>GBR</samp>’ in order to access thread local variables.
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</p>
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</dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005fthread_005fpointer"></a>Built-in Function: <em>void *</em> <strong>__builtin_thread_pointer</strong> <em>(void)</em></dt>
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<dd><p>Returns the value that is currently set in the ‘<samp>GBR</samp>’ register.
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Memory loads and stores that use the thread pointer as a base address are
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turned into ‘<samp>GBR</samp>’ based displacement loads and stores, if possible.
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For example:
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</p><div class="smallexample">
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<pre class="smallexample">struct my_tcb
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{
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int a, b, c, d, e;
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};
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int get_tcb_value (void)
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{
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// Generate ‘<samp>mov.l @(8,gbr),r0</samp>’ instruction
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return ((my_tcb*)__builtin_thread_pointer ())->c;
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}
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</pre></div>
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</dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005fsh_005fget_005ffpscr"></a>Built-in Function: <em>unsigned int</em> <strong>__builtin_sh_get_fpscr</strong> <em>(void)</em></dt>
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<dd><p>Returns the value that is currently set in the ‘<samp>FPSCR</samp>’ register.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005fsh_005fset_005ffpscr"></a>Built-in Function: <em>void</em> <strong>__builtin_sh_set_fpscr</strong> <em>(unsigned int <var>val</var>)</em></dt>
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<dd><p>Sets the ‘<samp>FPSCR</samp>’ register to the specified value <var>val</var>, while
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preserving the current values of the FR, SZ and PR bits.
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</p></dd></dl>
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</body>
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</html>
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