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<title>Using the GNU Compiler Collection (GCC): Altera Nios II Built-in Functions</title>

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<a name="Altera-Nios-II-Built_002din-Functions"></a>
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<p>
Next: <a href="ARC-Built_002din-Functions.html#ARC-Built_002din-Functions" accesskey="n" rel="next">ARC Built-in Functions</a>, Previous: <a href="Alpha-Built_002din-Functions.html#Alpha-Built_002din-Functions" accesskey="p" rel="prev">Alpha Built-in Functions</a>, Up: <a href="Target-Builtins.html#Target-Builtins" accesskey="u" rel="up">Target Builtins</a> &nbsp; [<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>
</div>
<hr>
<a name="Altera-Nios-II-Built_002din-Functions-1"></a>
<h4 class="subsection">6.60.3 Altera Nios II Built-in Functions</h4>

<p>These built-in functions are available for the Altera Nios II
family of processors.
</p>
<p>The following built-in functions are always available.  They
all generate the machine instruction that is part of the name.
</p>
<div class="example">
<pre class="example">int __builtin_ldbio (volatile const void *)
int __builtin_ldbuio (volatile const void *)
int __builtin_ldhio (volatile const void *)
int __builtin_ldhuio (volatile const void *)
int __builtin_ldwio (volatile const void *)
void __builtin_stbio (volatile void *, int)
void __builtin_sthio (volatile void *, int)
void __builtin_stwio (volatile void *, int)
void __builtin_sync (void)
int __builtin_rdctl (int) 
int __builtin_rdprs (int, int)
void __builtin_wrctl (int, int)
void __builtin_flushd (volatile void *)
void __builtin_flushda (volatile void *)
int __builtin_wrpie (int);
void __builtin_eni (int);
int __builtin_ldex (volatile const void *)
int __builtin_stex (volatile void *, int)
int __builtin_ldsex (volatile const void *)
int __builtin_stsex (volatile void *, int)
</pre></div>

<p>The following built-in functions are always available.  They
all generate a Nios II Custom Instruction. The name of the
function represents the types that the function takes and
returns. The letter before the <code>n</code> is the return type
or void if absent. The <code>n</code> represents the first parameter
to all the custom instructions, the custom instruction number.
The two letters after the <code>n</code> represent the up to two
parameters to the function.
</p>
<p>The letters represent the following data types:
</p><dl compact="compact">
<dt><code>&lt;no letter&gt;</code></dt>
<dd><p><code>void</code> for return type and no parameter for parameter types.
</p>
</dd>
<dt><code>i</code></dt>
<dd><p><code>int</code> for return type and parameter type
</p>
</dd>
<dt><code>f</code></dt>
<dd><p><code>float</code> for return type and parameter type
</p>
</dd>
<dt><code>p</code></dt>
<dd><p><code>void *</code> for return type and parameter type
</p>
</dd>
</dl>

<p>And the function names are:
</p><div class="example">
<pre class="example">void __builtin_custom_n (void)
void __builtin_custom_ni (int)
void __builtin_custom_nf (float)
void __builtin_custom_np (void *)
void __builtin_custom_nii (int, int)
void __builtin_custom_nif (int, float)
void __builtin_custom_nip (int, void *)
void __builtin_custom_nfi (float, int)
void __builtin_custom_nff (float, float)
void __builtin_custom_nfp (float, void *)
void __builtin_custom_npi (void *, int)
void __builtin_custom_npf (void *, float)
void __builtin_custom_npp (void *, void *)
int __builtin_custom_in (void)
int __builtin_custom_ini (int)
int __builtin_custom_inf (float)
int __builtin_custom_inp (void *)
int __builtin_custom_inii (int, int)
int __builtin_custom_inif (int, float)
int __builtin_custom_inip (int, void *)
int __builtin_custom_infi (float, int)
int __builtin_custom_inff (float, float)
int __builtin_custom_infp (float, void *)
int __builtin_custom_inpi (void *, int)
int __builtin_custom_inpf (void *, float)
int __builtin_custom_inpp (void *, void *)
float __builtin_custom_fn (void)
float __builtin_custom_fni (int)
float __builtin_custom_fnf (float)
float __builtin_custom_fnp (void *)
float __builtin_custom_fnii (int, int)
float __builtin_custom_fnif (int, float)
float __builtin_custom_fnip (int, void *)
float __builtin_custom_fnfi (float, int)
float __builtin_custom_fnff (float, float)
float __builtin_custom_fnfp (float, void *)
float __builtin_custom_fnpi (void *, int)
float __builtin_custom_fnpf (void *, float)
float __builtin_custom_fnpp (void *, void *)
void * __builtin_custom_pn (void)
void * __builtin_custom_pni (int)
void * __builtin_custom_pnf (float)
void * __builtin_custom_pnp (void *)
void * __builtin_custom_pnii (int, int)
void * __builtin_custom_pnif (int, float)
void * __builtin_custom_pnip (int, void *)
void * __builtin_custom_pnfi (float, int)
void * __builtin_custom_pnff (float, float)
void * __builtin_custom_pnfp (float, void *)
void * __builtin_custom_pnpi (void *, int)
void * __builtin_custom_pnpf (void *, float)
void * __builtin_custom_pnpp (void *, void *)
</pre></div>

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Next: <a href="ARC-Built_002din-Functions.html#ARC-Built_002din-Functions" accesskey="n" rel="next">ARC Built-in Functions</a>, Previous: <a href="Alpha-Built_002din-Functions.html#Alpha-Built_002din-Functions" accesskey="p" rel="prev">Alpha Built-in Functions</a>, Up: <a href="Target-Builtins.html#Target-Builtins" accesskey="u" rel="up">Target Builtins</a> &nbsp; [<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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