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305 lines
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<title>Using the GNU Compiler Collection (GCC): ARC Built-in Functions</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): ARC Built-in Functions">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<a name="ARC-Built_002din-Functions"></a>
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<div class="header">
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<p>
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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>
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</div>
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<hr>
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<a name="ARC-Built_002din-Functions-1"></a>
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<h4 class="subsection">6.59.4 ARC Built-in Functions</h4>
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<p>The following built-in functions are provided for ARC targets. The
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built-ins generate the corresponding assembly instructions. In the
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examples given below, the generated code often requires an operand or
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result to be in a register. Where necessary further code will be
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generated to ensure this is true, but for brevity this is not
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described in each case.
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</p>
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<p><em>Note:</em> Using a built-in to generate an instruction not supported
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by a target may cause problems. At present the compiler is not
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guaranteed to detect such misuse, and as a result an internal compiler
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error may be generated.
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</p>
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<dl>
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<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>
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<dd><p>Return 1 if <var>val</var> is known to have the byte alignment given
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by <var>alignval</var>, otherwise return 0.
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Note that this is different from
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</p><div class="smallexample">
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<pre class="smallexample">__alignof__(*(char *)<var>val</var>) >= alignval
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</pre></div>
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<p>because __alignof__ sees only the type of the dereference, whereas
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__builtin_arc_align uses alignment information from the pointer
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as well as from the pointed-to type.
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The information available will depend on optimization level.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005farc_005fbrk"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_brk</strong> <em>(void)</em></dt>
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<dd><p>Generates
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</p><div class="example">
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<pre class="example">brk
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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_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>
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<dd><p>The operand is the number of a register to be read. Generates:
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</p><div class="example">
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<pre class="example">mov <var>dest</var>, r<var>regno</var>
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</pre></div>
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<p>where the value in <var>dest</var> will be the result returned from the
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built-in.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>The first operand is the number of a register to be written, the
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second operand is a compile time constant to write into that
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register. Generates:
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</p><div class="example">
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<pre class="example">mov r<var>regno</var>, <var>val</var>
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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_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>
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<dd><p>Only available if either <samp>-mcpu=ARC700</samp> or <samp>-meA</samp> is set.
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Generates:
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</p><div class="example">
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<pre class="example">divaw <var>dest</var>, <var>a</var>, <var>b</var>
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</pre></div>
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<p>where the value in <var>dest</var> will be the result returned from the
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built-in.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>Generates
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</p><div class="example">
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<pre class="example">flag <var>a</var>
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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_005farc_005flr"></a>Built-in Function: <em>unsigned int</em> <strong>__builtin_arc_lr</strong> <em>(unsigned int <var>auxr</var>)</em></dt>
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<dd><p>The operand, <var>auxv</var>, is the address of an auxiliary register and
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must be a compile time constant. Generates:
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</p><div class="example">
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<pre class="example">lr <var>dest</var>, [<var>auxr</var>]
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</pre></div>
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<p>Where the value in <var>dest</var> will be the result returned from the
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built-in.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>Only available with <samp>-mmul64</samp>. Generates:
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</p><div class="example">
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<pre class="example">mul64 <var>a</var>, <var>b</var>
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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_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>
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<dd><p>Only available with <samp>-mmul64</samp>. Generates:
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</p><div class="example">
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<pre class="example">mulu64 <var>a</var>, <var>b</var>
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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_005farc_005fnop"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_nop</strong> <em>(void)</em></dt>
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<dd><p>Generates:
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</p><div class="example">
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<pre class="example">nop
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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_005farc_005fnorm"></a>Built-in Function: <em>int</em> <strong>__builtin_arc_norm</strong> <em>(int <var>src</var>)</em></dt>
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<dd><p>Only valid if the ‘<samp>norm</samp>’ instruction is available through the
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<samp>-mnorm</samp> option or by default with <samp>-mcpu=ARC700</samp>.
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Generates:
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</p><div class="example">
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<pre class="example">norm <var>dest</var>, <var>src</var>
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</pre></div>
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<p>Where the value in <var>dest</var> will be the result returned from the
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built-in.
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</p></dd></dl>
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<dl>
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<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>
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<dd><p>Only valid if the ‘<samp>normw</samp>’ instruction is available through the
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<samp>-mnorm</samp> option or by default with <samp>-mcpu=ARC700</samp>.
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Generates:
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</p><div class="example">
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<pre class="example">normw <var>dest</var>, <var>src</var>
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</pre></div>
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<p>Where the value in <var>dest</var> will be the result returned from the
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built-in.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005farc_005frtie"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_rtie</strong> <em>(void)</em></dt>
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<dd><p>Generates:
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</p><div class="example">
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<pre class="example">rtie
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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_005farc_005fsleep"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_sleep</strong> <em>(int <var>a</var></em></dt>
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<dd><p>Generates:
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</p><div class="example">
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<pre class="example">sleep <var>a</var>
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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_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>
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<dd><p>The first argument, <var>auxv</var>, is the address of an auxiliary
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register, the second argument, <var>val</var>, is a compile time constant
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to be written to the register. Generates:
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</p><div class="example">
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<pre class="example">sr <var>auxr</var>, [<var>val</var>]
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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_005farc_005fswap"></a>Built-in Function: <em>int</em> <strong>__builtin_arc_swap</strong> <em>(int <var>src</var>)</em></dt>
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<dd><p>Only valid with <samp>-mswap</samp>. Generates:
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</p><div class="example">
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<pre class="example">swap <var>dest</var>, <var>src</var>
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</pre></div>
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<p>Where the value in <var>dest</var> will be the result returned from the
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built-in.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fbuiltin_005farc_005fswi"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_swi</strong> <em>(void)</em></dt>
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<dd><p>Generates:
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</p><div class="example">
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<pre class="example">swi
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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_005farc_005fsync"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_sync</strong> <em>(void)</em></dt>
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<dd><p>Only available with <samp>-mcpu=ARC700</samp>. Generates:
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</p><div class="example">
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<pre class="example">sync
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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_005farc_005ftrap_005fs"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_trap_s</strong> <em>(unsigned int <var>c</var>)</em></dt>
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<dd><p>Only available with <samp>-mcpu=ARC700</samp>. Generates:
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</p><div class="example">
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<pre class="example">trap_s <var>c</var>
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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_005farc_005funimp_005fs"></a>Built-in Function: <em>void</em> <strong>__builtin_arc_unimp_s</strong> <em>(void)</em></dt>
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<dd><p>Only available with <samp>-mcpu=ARC700</samp>. Generates:
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</p><div class="example">
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<pre class="example">unimp_s
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</pre></div>
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</dd></dl>
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<p>The instructions generated by the following builtins are not
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considered as candidates for scheduling. They are not moved around by
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the compiler during scheduling, and thus can be expected to appear
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where they are put in the C code:
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</p><div class="example">
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<pre class="example">__builtin_arc_brk()
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__builtin_arc_core_read()
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__builtin_arc_core_write()
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__builtin_arc_flag()
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__builtin_arc_lr()
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__builtin_arc_sleep()
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__builtin_arc_sr()
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__builtin_arc_swi()
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</pre></div>
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<hr>
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<div class="header">
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<p>
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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>
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