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+<div class="subsection-level-extent" id="SH-Built-in-Functions"> <div class="nav-panel"> <p> Next: <a href="sparc-vis-built-in-functions" accesskey="n" rel="next">SPARC VIS Built-in Functions</a>, Previous: <a href="s_002f390-system-z-built-in-functions" accesskey="p" rel="prev">S/390 System z Built-in Functions</a>, Up: <a href="target-builtins" accesskey="u" rel="up">Built-in Functions Specific to Particular Target Machines</a> [<a href="index#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="indices" title="Index" rel="index">Index</a>]</p> </div>  <h1 class="subsection" id="SH-Built-in-Functions-1"><span>6.60.32 SH Built-in Functions<a class="copiable-link" href="#SH-Built-in-Functions-1"> ¶</a></span></h1> <p>The following built-in functions are supported on the SH1, SH2, SH3 and SH4 families of processors: </p> <dl class="first-deftypefn"> <dt class="deftypefn" id="index-_005f_005fbuiltin_005fset_005fthread_005fpointer">
+<span class="category-def">Built-in Function: </span><span><code class="def-type">void</code> <strong class="def-name">__builtin_set_thread_pointer</strong> <code class="def-code-arguments">(void *<var class="var">ptr</var>)</code><a class="copiable-link" href="#index-_005f_005fbuiltin_005fset_005fthread_005fpointer"> ¶</a></span>
+</dt> <dd>
+<p>Sets the ‘<samp class="samp">GBR</samp>’ register to the specified value <var class="var">ptr</var>. This is usually used by system code that manages threads and execution contexts. The compiler normally does not generate code that modifies the contents of ‘<samp class="samp">GBR</samp>’ and thus the value is preserved across function calls. Changing the ‘<samp class="samp">GBR</samp>’ value in user code must be done with caution, since the compiler might use ‘<samp class="samp">GBR</samp>’ in order to access thread local variables. </p> </dd>
+</dl> <dl class="first-deftypefn"> <dt class="deftypefn" id="index-_005f_005fbuiltin_005fthread_005fpointer-1">
+<span class="category-def">Built-in Function: </span><span><code class="def-type">void *</code> <strong class="def-name">__builtin_thread_pointer</strong> <code class="def-code-arguments">(void)</code><a class="copiable-link" href="#index-_005f_005fbuiltin_005fthread_005fpointer-1"> ¶</a></span>
+</dt> <dd>
+<p>Returns the value that is currently set in the ‘<samp class="samp">GBR</samp>’ register. Memory loads and stores that use the thread pointer as a base address are turned into ‘<samp class="samp">GBR</samp>’ based displacement loads and stores, if possible. For example: </p>
+<div class="example smallexample"> <pre class="example-preformatted" data-language="cpp">struct my_tcb
+{
+   int a, b, c, d, e;
+};
+
+int get_tcb_value (void)
+{
+  // Generate ‘<samp class="samp">mov.l @(8,gbr),r0</samp>’ instruction
+  return ((my_tcb*)__builtin_thread_pointer ())-&gt;c;
+}</pre>
+</div> </dd>
+</dl> <dl class="first-deftypefn"> <dt class="deftypefn" id="index-_005f_005fbuiltin_005fsh_005fget_005ffpscr">
+<span class="category-def">Built-in Function: </span><span><code class="def-type">unsigned int</code> <strong class="def-name">__builtin_sh_get_fpscr</strong> <code class="def-code-arguments">(void)</code><a class="copiable-link" href="#index-_005f_005fbuiltin_005fsh_005fget_005ffpscr"> ¶</a></span>
+</dt> <dd><p>Returns the value that is currently set in the ‘<samp class="samp">FPSCR</samp>’ register. </p></dd>
+</dl> <dl class="first-deftypefn"> <dt class="deftypefn" id="index-_005f_005fbuiltin_005fsh_005fset_005ffpscr">
+<span class="category-def">Built-in Function: </span><span><code class="def-type">void</code> <strong class="def-name">__builtin_sh_set_fpscr</strong> <code class="def-code-arguments">(unsigned int <var class="var">val</var>)</code><a class="copiable-link" href="#index-_005f_005fbuiltin_005fsh_005fset_005ffpscr"> ¶</a></span>
+</dt> <dd><p>Sets the ‘<samp class="samp">FPSCR</samp>’ register to the specified value <var class="var">val</var>, while preserving the current values of the FR, SZ and PR bits. </p></dd>
+</dl> </div>  <div class="nav-panel"> <p> Next: <a href="sparc-vis-built-in-functions">SPARC VIS Built-in Functions</a>, Previous: <a href="s_002f390-system-z-built-in-functions">S/390 System z Built-in Functions</a>, Up: <a href="target-builtins">Built-in Functions Specific to Particular Target Machines</a> [<a href="index#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="indices" title="Index" rel="index">Index</a>]</p> </div><div class="_attribution">
+  <p class="_attribution-p">
+    &copy; Free Software Foundation<br>Licensed under the GNU Free Documentation License, Version 1.3.<br>
+    <a href="https://gcc.gnu.org/onlinedocs/gcc-13.1.0/gcc/SH-Built-in-Functions.html" class="_attribution-link">https://gcc.gnu.org/onlinedocs/gcc-13.1.0/gcc/SH-Built-in-Functions.html</a>
+  </p>
+</div>