other-builtins.html

自己收集的linux入门到学懂高级编程书集 包括linux程序设计第三版

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<td align="left">long double <b>__builtin_nanl</b><i> </i>(<i>const char *str</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
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<tr><td>
Similar to <code>__builtin_nan</code>, except the return type is <code>long double</code>. 
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<p>
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<td align="left">double <b>__builtin_nans</b><i> </i>(<i>const char *str</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
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<tr><td>
Similar to <code>__builtin_nan</code>, except the significand is forced
to be a signaling NaN.  The <code>nans</code> function is proposed by
<a href="http://std.dkuug.dk/JTC1/SC22/WG14/www/docs/n965.htm">WG14 N965</a>. 
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<p>
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<td align="left">float <b>__builtin_nansf</b><i> </i>(<i>const char *str</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
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<tr><td>
Similar to <code>__builtin_nans</code>, except the return type is <code>float</code>. 
</td></tr>
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<p>
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<td align="left">long double <b>__builtin_nansl</b><i> </i>(<i>const char *str</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
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<tr><td>
Similar to <code>__builtin_nans</code>, except the return type is <code>long double</code>. 
</td></tr>
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<p>
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<td align="left">int <b>__builtin_ffs</b><i> </i>(<i>unsigned int x</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
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<tr><td>
Returns one plus the index of the least significant 1-bit of <var>x</var>, or
if <var>x</var> is zero, returns zero. 
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<p>
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<td align="left">int <b>__builtin_clz</b><i> </i>(<i>unsigned int x</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
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<tr><td>
Returns the number of leading 0-bits in <var>x</var>, starting at the most
significant bit position.  If <var>x</var> is 0, the result is undefined. 
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<p>
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<td align="left">int <b>__builtin_ctz</b><i> </i>(<i>unsigned int x</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
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<tr><td>
Returns the number of trailing 0-bits in <var>x</var>, starting at the least
significant bit position.  If <var>x</var> is 0, the result is undefined. 
</td></tr>
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<p>
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<td align="left">int <b>__builtin_popcount</b><i> </i>(<i>unsigned int x</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
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<tr><td>
Returns the number of 1-bits in <var>x</var>. 
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<p>
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<td align="left">int <b>__builtin_parity</b><i> </i>(<i>unsigned int x</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
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<tr><td>
Returns the parity of <var>x</var>, i.e. the number of 1-bits in <var>x</var>
modulo 2. 
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<p>
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<td align="left">int <b>__builtin_ffsl</b><i> </i>(<i>unsigned long</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
</table>
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<tr><td>
Similar to <code>__builtin_ffs</code>, except the argument type is
<code>unsigned long</code>. 
</td></tr>
</table>

<p>
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<td align="left">int <b>__builtin_clzl</b><i> </i>(<i>unsigned long</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
</table>
<table width="95%" align="center">
<tr><td>
Similar to <code>__builtin_clz</code>, except the argument type is
<code>unsigned long</code>. 
</td></tr>
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<p>
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<td align="left">int <b>__builtin_ctzl</b><i> </i>(<i>unsigned long</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
</table>
<table width="95%" align="center">
<tr><td>
Similar to <code>__builtin_ctz</code>, except the argument type is
<code>unsigned long</code>. 
</td></tr>
</table>

<p>
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<td align="left">int <b>__builtin_popcountl</b><i> </i>(<i>unsigned long</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
</table>
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<tr><td>
Similar to <code>__builtin_popcount</code>, except the argument type is
<code>unsigned long</code>. 
</td></tr>
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<p>
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<td align="left">int <b>__builtin_parityl</b><i> </i>(<i>unsigned long</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
</table>
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<tr><td>
Similar to <code>__builtin_parity</code>, except the argument type is
<code>unsigned long</code>. 
</td></tr>
</table>

<p>
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<td align="left">int <b>__builtin_ffsll</b><i> </i>(<i>unsigned long long</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
</table>
<table width="95%" align="center">
<tr><td>
Similar to <code>__builtin_ffs</code>, except the argument type is
<code>unsigned long long</code>. 
</td></tr>
</table>

<p>
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<td align="left">int <b>__builtin_clzll</b><i> </i>(<i>unsigned long long</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
</table>
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<tr><td>
Similar to <code>__builtin_clz</code>, except the argument type is
<code>unsigned long long</code>. 
</td></tr>
</table>

<p>
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<td align="left">int <b>__builtin_ctzll</b><i> </i>(<i>unsigned long long</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
</table>
<table width="95%" align="center">
<tr><td>
Similar to <code>__builtin_ctz</code>, except the argument type is
<code>unsigned long long</code>. 
</td></tr>
</table>

<p>
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<tr>
<td align="left">int <b>__builtin_popcountll</b><i> </i>(<i>unsigned long long</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
</table>
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<tr><td>
Similar to <code>__builtin_popcount</code>, except the argument type is
<code>unsigned long long</code>. 
</td></tr>
</table>

<p>
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<tr>
<td align="left">int <b>__builtin_parityll</b><i> </i>(<i>unsigned long long</i>)<i>
     </i></td>
<td align="right">Built-in Function</td>
</tr>
</table>
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<tr><td>
Similar to <code>__builtin_parity</code>, except the argument type is
<code>unsigned long long</code>. 
</td></tr>
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