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 <a name="ARC-Built_002din-Functions"></a>
 <div class="header">
 <p>
 Next: <a href="ARC-SIMD-Built_002din-Functions.html#ARC-SIMD-Built_002din-Functions" accesskey="n" rel="next">ARC SIMD Built-in Functions</a>, Previous: <a href="Altera-Nios-II-Built_002din-Functions.html#Altera-Nios-II-Built_002din-Functions" accesskey="p" rel="prev">Altera Nios II 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="ARC-Built_002din-Functions-1"></a>
 <h4 class="subsection">6.57.4 ARC Built-in Functions</h4>

 <p>The following built-in functions are provided for ARC targets.  The
 built-ins generate the corresponding assembly instructions.  In the
 examples given below, the generated code often requires an operand or
 result to be in a register.  Where necessary further code will be
 generated to ensure this is true, but for brevity this is not
 described in each case.
 </p>
 <p><em>Note:</em> Using a built-in to generate an instruction not supported
 by a target may cause problems. At present the compiler is not
 guaranteed to detect such misuse, and as a result an internal compiler
 error may be generated.
 </p>
 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005faligned"></a>Built-in Function: <em>int</em> <strong>__builtin_arc_aligned</strong> <em>(void *<var>val</var>, int <var>alignval</var>)</em></dt>
 <dd><p>Return 1 if <var>val</var> is known to have the byte alignment given
 by <var>alignval</var>, otherwise return 0.
 Note that this is different from
 </p><div class="smallexample">
 <pre class="smallexample">__alignof__(*(char *)<var>val</var>) &gt;= alignval
 </pre></div>
 <p>because __alignof__ sees only the type of the dereference, whereas
 __builtin_arc_align uses alignment information from the pointer
 as well as from the pointed-to type.
 The information available will depend on optimization level.
 </p></dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005fbrk"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_brk</strong> <em>(void)</em></dt>
 <dd><p>Generates
 </p><div class="example">
 <pre class="example">brk
 </pre></div>
 </dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005fcore_005fread"></a>Built-in Function: <em>unsigned int</em> <strong>__builtin_arc_core_read</strong> <em>(unsigned int <var>regno</var>)</em></dt>
 <dd><p>The operand is the number of a register to be read.  Generates:
 </p><div class="example">
 <pre class="example">mov  <var>dest</var>, r<var>regno</var>
 </pre></div>
 <p>where the value in <var>dest</var> will be the result returned from the
 built-in.
 </p></dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005fcore_005fwrite"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_core_write</strong> <em>(unsigned int <var>regno</var>, unsigned int <var>val</var>)</em></dt>
 <dd><p>The first operand is the number of a register to be written, the
 second operand is a compile time constant to write into that
 register.  Generates:
 </p><div class="example">
 <pre class="example">mov  r<var>regno</var>, <var>val</var>
 </pre></div>
 </dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005fdivaw"></a>Built-in Function: <em>int</em> <strong>__builtin_arc_divaw</strong> <em>(int <var>a</var>, int <var>b</var>)</em></dt>
 <dd><p>Only available if either <samp>-mcpu=ARC700</samp> or <samp>-meA</samp> is set.
 Generates:
 </p><div class="example">
 <pre class="example">divaw  <var>dest</var>, <var>a</var>, <var>b</var>
 </pre></div>
 <p>where the value in <var>dest</var> will be the result returned from the
 built-in.
 </p></dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005fflag"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_flag</strong> <em>(unsigned int <var>a</var>)</em></dt>
 <dd><p>Generates
 </p><div class="example">
 <pre class="example">flag  <var>a</var>
 </pre></div>
 </dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005flr"></a>Built-in Function: <em>unsigned int</em> <strong>__builtin_arc_lr</strong> <em>(unsigned int <var>auxr</var>)</em></dt>
 <dd><p>The operand, <var>auxv</var>, is the address of an auxiliary register and
 must be a compile time constant.  Generates:
 </p><div class="example">
 <pre class="example">lr  <var>dest</var>, [<var>auxr</var>]
 </pre></div>
 <p>Where the value in <var>dest</var> will be the result returned from the
 built-in.
 </p></dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005fmul64"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_mul64</strong> <em>(int <var>a</var>, int <var>b</var>)</em></dt>
 <dd><p>Only available with <samp>-mmul64</samp>.  Generates:
 </p><div class="example">
 <pre class="example">mul64  <var>a</var>, <var>b</var>
 </pre></div>
 </dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005fmulu64"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_mulu64</strong> <em>(unsigned int <var>a</var>, unsigned int <var>b</var>)</em></dt>
 <dd><p>Only available with <samp>-mmul64</samp>.  Generates:
 </p><div class="example">
 <pre class="example">mulu64  <var>a</var>, <var>b</var>
 </pre></div>
 </dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005fnop"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_nop</strong> <em>(void)</em></dt>
 <dd><p>Generates:
 </p><div class="example">
 <pre class="example">nop
 </pre></div>
 </dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005fnorm"></a>Built-in Function: <em>int</em> <strong>__builtin_arc_norm</strong> <em>(int <var>src</var>)</em></dt>
 <dd><p>Only valid if the &lsquo;<samp>norm</samp>&rsquo; instruction is available through the
 <samp>-mnorm</samp> option or by default with <samp>-mcpu=ARC700</samp>.
 Generates:
 </p><div class="example">
 <pre class="example">norm  <var>dest</var>, <var>src</var>
 </pre></div>
 <p>Where the value in <var>dest</var> will be the result returned from the
 built-in.
 </p></dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005fnormw"></a>Built-in Function: <em>short int</em> <strong>__builtin_arc_normw</strong> <em>(short int <var>src</var>)</em></dt>
 <dd><p>Only valid if the &lsquo;<samp>normw</samp>&rsquo; instruction is available through the
 <samp>-mnorm</samp> option or by default with <samp>-mcpu=ARC700</samp>.
 Generates:
 </p><div class="example">
 <pre class="example">normw  <var>dest</var>, <var>src</var>
 </pre></div>
 <p>Where the value in <var>dest</var> will be the result returned from the
 built-in.
 </p></dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005frtie"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_rtie</strong> <em>(void)</em></dt>
 <dd><p>Generates:
 </p><div class="example">
 <pre class="example">rtie
 </pre></div>
 </dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005fsleep"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_sleep</strong> <em>(int <var>a</var></em></dt>
 <dd><p>Generates:
 </p><div class="example">
 <pre class="example">sleep  <var>a</var>
 </pre></div>
 </dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005fsr"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_sr</strong> <em>(unsigned int <var>auxr</var>, unsigned int <var>val</var>)</em></dt>
 <dd><p>The first argument, <var>auxv</var>, is the address of an auxiliary
 register, the second argument, <var>val</var>, is a compile time constant
 to be written to the register.  Generates:
 </p><div class="example">
 <pre class="example">sr  <var>auxr</var>, [<var>val</var>]
 </pre></div>
 </dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005fswap"></a>Built-in Function: <em>int</em> <strong>__builtin_arc_swap</strong> <em>(int <var>src</var>)</em></dt>
 <dd><p>Only valid with <samp>-mswap</samp>.  Generates:
 </p><div class="example">
 <pre class="example">swap  <var>dest</var>, <var>src</var>
 </pre></div>
 <p>Where the value in <var>dest</var> will be the result returned from the
 built-in.
 </p></dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005fswi"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_swi</strong> <em>(void)</em></dt>
 <dd><p>Generates:
 </p><div class="example">
 <pre class="example">swi
 </pre></div>
 </dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005fsync"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_sync</strong> <em>(void)</em></dt>
 <dd><p>Only available with <samp>-mcpu=ARC700</samp>.  Generates:
 </p><div class="example">
 <pre class="example">sync
 </pre></div>
 </dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005ftrap_005fs"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_trap_s</strong> <em>(unsigned int <var>c</var>)</em></dt>
 <dd><p>Only available with <samp>-mcpu=ARC700</samp>.  Generates:
 </p><div class="example">
 <pre class="example">trap_s  <var>c</var>
 </pre></div>
 </dd></dl>

 <dl>
 <dt><a name="index-_005f_005fbuiltin_005farc_005funimp_005fs"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_unimp_s</strong> <em>(void)</em></dt>
 <dd><p>Only available with <samp>-mcpu=ARC700</samp>.  Generates:
 </p><div class="example">
 <pre class="example">unimp_s
 </pre></div>
 </dd></dl>

 <p>The instructions generated by the following builtins are not
 considered as candidates for scheduling.  They are not moved around by
 the compiler during scheduling, and thus can be expected to appear
 where they are put in the C code:
 </p><div class="example">
 <pre class="example">__builtin_arc_brk()
 __builtin_arc_core_read()
 __builtin_arc_core_write()
 __builtin_arc_flag()
 __builtin_arc_lr()
 __builtin_arc_sleep()
 __builtin_arc_sr()
 __builtin_arc_swi()
 </pre></div>

 <hr>
 <div class="header">
 <p>
 Next: <a href="ARC-SIMD-Built_002din-Functions.html#ARC-SIMD-Built_002din-Functions" accesskey="n" rel="next">ARC SIMD Built-in Functions</a>, Previous: <a href="Altera-Nios-II-Built_002din-Functions.html#Altera-Nios-II-Built_002din-Functions" accesskey="p" rel="prev">Altera Nios II 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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	<a name="ARC-Built_002din-Functions"></a>
	<div class="header">
	<p>
	Next: <a href="ARC-SIMD-Built_002din-Functions.html#ARC-SIMD-Built_002din-Functions" accesskey="n" rel="next">ARC SIMD Built-in Functions</a>, Previous: <a href="Altera-Nios-II-Built_002din-Functions.html#Altera-Nios-II-Built_002din-Functions" accesskey="p" rel="prev">Altera Nios II 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>
	</div>
	<hr>
	<a name="ARC-Built_002din-Functions-1"></a>
	<h4 class="subsection">6.57.4 ARC Built-in Functions</h4>

	<p>The following built-in functions are provided for ARC targets. The
	built-ins generate the corresponding assembly instructions. In the
	examples given below, the generated code often requires an operand or
	result to be in a register. Where necessary further code will be
	generated to ensure this is true, but for brevity this is not
	described in each case.
	</p>
	<p><em>Note:</em> Using a built-in to generate an instruction not supported
	by a target may cause problems. At present the compiler is not
	guaranteed to detect such misuse, and as a result an internal compiler
	error may be generated.
	</p>
	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005faligned"></a>Built-in Function: <em>int</em> <strong>__builtin_arc_aligned</strong> <em>(void *<var>val</var>, int <var>alignval</var>)</em></dt>
	<dd><p>Return 1 if <var>val</var> is known to have the byte alignment given
	by <var>alignval</var>, otherwise return 0.
	Note that this is different from
	</p><div class="smallexample">
	<pre class="smallexample">__alignof__((char )<var>val</var>) >= alignval
	</pre></div>
	<p>because __alignof__ sees only the type of the dereference, whereas
	__builtin_arc_align uses alignment information from the pointer
	as well as from the pointed-to type.
	The information available will depend on optimization level.
	</p></dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005fbrk"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_brk</strong> <em>(void)</em></dt>
	<dd><p>Generates
	</p><div class="example">
	<pre class="example">brk
	</pre></div>
	</dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005fcore_005fread"></a>Built-in Function: <em>unsigned int</em> <strong>__builtin_arc_core_read</strong> <em>(unsigned int <var>regno</var>)</em></dt>
	<dd><p>The operand is the number of a register to be read. Generates:
	</p><div class="example">
	<pre class="example">mov <var>dest</var>, r<var>regno</var>
	</pre></div>
	<p>where the value in <var>dest</var> will be the result returned from the
	built-in.
	</p></dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005fcore_005fwrite"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_core_write</strong> <em>(unsigned int <var>regno</var>, unsigned int <var>val</var>)</em></dt>
	<dd><p>The first operand is the number of a register to be written, the
	second operand is a compile time constant to write into that
	register. Generates:
	</p><div class="example">
	<pre class="example">mov r<var>regno</var>, <var>val</var>
	</pre></div>
	</dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005fdivaw"></a>Built-in Function: <em>int</em> <strong>__builtin_arc_divaw</strong> <em>(int <var>a</var>, int <var>b</var>)</em></dt>
	<dd><p>Only available if either <samp>-mcpu=ARC700</samp> or <samp>-meA</samp> is set.
	Generates:
	</p><div class="example">
	<pre class="example">divaw <var>dest</var>, <var>a</var>, <var>b</var>
	</pre></div>
	<p>where the value in <var>dest</var> will be the result returned from the
	built-in.
	</p></dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005fflag"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_flag</strong> <em>(unsigned int <var>a</var>)</em></dt>
	<dd><p>Generates
	</p><div class="example">
	<pre class="example">flag <var>a</var>
	</pre></div>
	</dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005flr"></a>Built-in Function: <em>unsigned int</em> <strong>__builtin_arc_lr</strong> <em>(unsigned int <var>auxr</var>)</em></dt>
	<dd><p>The operand, <var>auxv</var>, is the address of an auxiliary register and
	must be a compile time constant. Generates:
	</p><div class="example">
	<pre class="example">lr <var>dest</var>, [<var>auxr</var>]
	</pre></div>
	<p>Where the value in <var>dest</var> will be the result returned from the
	built-in.
	</p></dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005fmul64"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_mul64</strong> <em>(int <var>a</var>, int <var>b</var>)</em></dt>
	<dd><p>Only available with <samp>-mmul64</samp>. Generates:
	</p><div class="example">
	<pre class="example">mul64 <var>a</var>, <var>b</var>
	</pre></div>
	</dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005fmulu64"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_mulu64</strong> <em>(unsigned int <var>a</var>, unsigned int <var>b</var>)</em></dt>
	<dd><p>Only available with <samp>-mmul64</samp>. Generates:
	</p><div class="example">
	<pre class="example">mulu64 <var>a</var>, <var>b</var>
	</pre></div>
	</dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005fnop"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_nop</strong> <em>(void)</em></dt>
	<dd><p>Generates:
	</p><div class="example">
	<pre class="example">nop
	</pre></div>
	</dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005fnorm"></a>Built-in Function: <em>int</em> <strong>__builtin_arc_norm</strong> <em>(int <var>src</var>)</em></dt>
	<dd><p>Only valid if the ‘<samp>norm</samp>’ instruction is available through the
	<samp>-mnorm</samp> option or by default with <samp>-mcpu=ARC700</samp>.
	Generates:
	</p><div class="example">
	<pre class="example">norm <var>dest</var>, <var>src</var>
	</pre></div>
	<p>Where the value in <var>dest</var> will be the result returned from the
	built-in.
	</p></dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005fnormw"></a>Built-in Function: <em>short int</em> <strong>__builtin_arc_normw</strong> <em>(short int <var>src</var>)</em></dt>
	<dd><p>Only valid if the ‘<samp>normw</samp>’ instruction is available through the
	<samp>-mnorm</samp> option or by default with <samp>-mcpu=ARC700</samp>.
	Generates:
	</p><div class="example">
	<pre class="example">normw <var>dest</var>, <var>src</var>
	</pre></div>
	<p>Where the value in <var>dest</var> will be the result returned from the
	built-in.
	</p></dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005frtie"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_rtie</strong> <em>(void)</em></dt>
	<dd><p>Generates:
	</p><div class="example">
	<pre class="example">rtie
	</pre></div>
	</dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005fsleep"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_sleep</strong> <em>(int <var>a</var></em></dt>
	<dd><p>Generates:
	</p><div class="example">
	<pre class="example">sleep <var>a</var>
	</pre></div>
	</dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005fsr"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_sr</strong> <em>(unsigned int <var>auxr</var>, unsigned int <var>val</var>)</em></dt>
	<dd><p>The first argument, <var>auxv</var>, is the address of an auxiliary
	register, the second argument, <var>val</var>, is a compile time constant
	to be written to the register. Generates:
	</p><div class="example">
	<pre class="example">sr <var>auxr</var>, [<var>val</var>]
	</pre></div>
	</dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005fswap"></a>Built-in Function: <em>int</em> <strong>__builtin_arc_swap</strong> <em>(int <var>src</var>)</em></dt>
	<dd><p>Only valid with <samp>-mswap</samp>. Generates:
	</p><div class="example">
	<pre class="example">swap <var>dest</var>, <var>src</var>
	</pre></div>
	<p>Where the value in <var>dest</var> will be the result returned from the
	built-in.
	</p></dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005fswi"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_swi</strong> <em>(void)</em></dt>
	<dd><p>Generates:
	</p><div class="example">
	<pre class="example">swi
	</pre></div>
	</dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005fsync"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_sync</strong> <em>(void)</em></dt>
	<dd><p>Only available with <samp>-mcpu=ARC700</samp>. Generates:
	</p><div class="example">
	<pre class="example">sync
	</pre></div>
	</dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005ftrap_005fs"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_trap_s</strong> <em>(unsigned int <var>c</var>)</em></dt>
	<dd><p>Only available with <samp>-mcpu=ARC700</samp>. Generates:
	</p><div class="example">
	<pre class="example">trap_s <var>c</var>
	</pre></div>
	</dd></dl>

	<dl>
	<dt><a name="index-_005f_005fbuiltin_005farc_005funimp_005fs"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_unimp_s</strong> <em>(void)</em></dt>
	<dd><p>Only available with <samp>-mcpu=ARC700</samp>. Generates:
	</p><div class="example">
	<pre class="example">unimp_s
	</pre></div>
	</dd></dl>

	<p>The instructions generated by the following builtins are not
	considered as candidates for scheduling. They are not moved around by
	the compiler during scheduling, and thus can be expected to appear
	where they are put in the C code:
	</p><div class="example">
	<pre class="example">__builtin_arc_brk()
	__builtin_arc_core_read()
	__builtin_arc_core_write()
	__builtin_arc_flag()
	__builtin_arc_lr()
	__builtin_arc_sleep()
	__builtin_arc_sr()
	__builtin_arc_swi()
	</pre></div>

	<hr>
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	<p>
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