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105 lines
5.3 KiB
HTML
105 lines
5.3 KiB
HTML
4 years ago
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<html lang="en">
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<title>SH Built-in Functions - Using the GNU Compiler Collection (GCC)</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Using the GNU Compiler Collection (GCC)">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Target-Builtins.html#Target-Builtins" title="Target Builtins">
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<link rel="prev" href="S_002f390-System-z-Built_002din-Functions.html#S_002f390-System-z-Built_002din-Functions" title="S/390 System z Built-in Functions">
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<link rel="next" href="SPARC-VIS-Built_002din-Functions.html#SPARC-VIS-Built_002din-Functions" title="SPARC VIS Built-in Functions">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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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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</head>
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<body>
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<div class="node">
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<a name="SH-Built-in-Functions"></a>
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<a name="SH-Built_002din-Functions"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="SPARC-VIS-Built_002din-Functions.html#SPARC-VIS-Built_002din-Functions">SPARC VIS Built-in Functions</a>,
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Previous: <a rel="previous" accesskey="p" href="S_002f390-System-z-Built_002din-Functions.html#S_002f390-System-z-Built_002din-Functions">S/390 System z Built-in Functions</a>,
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Up: <a rel="up" accesskey="u" href="Target-Builtins.html#Target-Builtins">Target Builtins</a>
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<hr>
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</div>
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<h4 class="subsection">6.58.24 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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<div class="defun">
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— Built-in Function: void <b>__builtin_set_thread_pointer</b> (<var>void *ptr</var>)<var><a name="index-g_t_005f_005fbuiltin_005fset_005fthread_005fpointer-4142"></a></var><br>
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<blockquote><p>Sets the ‘<samp><span class="samp">GBR</span></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><span class="samp">GBR</span></samp>’ and
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thus the value is preserved across function calls. Changing the ‘<samp><span class="samp">GBR</span></samp>’
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value in user code must be done with caution, since the compiler might use
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‘<samp><span class="samp">GBR</span></samp>’ in order to access thread local variables.
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</blockquote></div>
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<div class="defun">
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— Built-in Function: void * <b>__builtin_thread_pointer</b> (<var>void</var>)<var><a name="index-g_t_005f_005fbuiltin_005fthread_005fpointer-4143"></a></var><br>
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<blockquote><p>Returns the value that is currently set in the ‘<samp><span class="samp">GBR</span></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><span class="samp">GBR</span></samp>’ based displacement loads and stores, if possible.
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For example:
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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><span class="samp">mov.l @(8,gbr),r0</span></samp>’ instruction
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return ((my_tcb*)__builtin_thread_pointer ())->c;
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}
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</pre>
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</blockquote></div>
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<div class="defun">
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— Built-in Function: unsigned int <b>__builtin_sh_get_fpscr</b> (<var>void</var>)<var><a name="index-g_t_005f_005fbuiltin_005fsh_005fget_005ffpscr-4144"></a></var><br>
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<blockquote><p>Returns the value that is currently set in the ‘<samp><span class="samp">FPSCR</span></samp>’ register.
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</p></blockquote></div>
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<div class="defun">
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— Built-in Function: void <b>__builtin_sh_set_fpscr</b> (<var>unsigned int val</var>)<var><a name="index-g_t_005f_005fbuiltin_005fsh_005fset_005ffpscr-4145"></a></var><br>
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<blockquote><p>Sets the ‘<samp><span class="samp">FPSCR</span></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></blockquote></div>
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</body></html>
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