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129 lines
5.9 KiB
HTML
129 lines
5.9 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<head>
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<title>SH Built-in Functions (Using the GNU Compiler Collection (GCC))</title>
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<meta name="description" content="SH Built-in Functions (Using the GNU Compiler Collection (GCC))">
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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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<a name="SH-Built_002din-Functions"></a>
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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">6.59.27 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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