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<a name="Raw-Read_002fWrite-Functions"></a>
<h4 class="subsubsection">6.60.13.4 Raw Read/Write Functions</h4>

<p>This sections describes built-in functions related to read and write
instructions to access memory.  These functions generate
<code>membar</code> instructions to flush the I/O load and stores where
appropriate, as described in Fujitsu&rsquo;s manual described above.
</p>
<dl compact="compact">
<dt><code>unsigned char __builtin_read8 (void *<var>data</var>)</code></dt>
<dt><code>unsigned short __builtin_read16 (void *<var>data</var>)</code></dt>
<dt><code>unsigned long __builtin_read32 (void *<var>data</var>)</code></dt>
<dt><code>unsigned long long __builtin_read64 (void *<var>data</var>)</code></dt>
<dt><code>void __builtin_write8 (void *<var>data</var>, unsigned char <var>datum</var>)</code></dt>
<dt><code>void __builtin_write16 (void *<var>data</var>, unsigned short <var>datum</var>)</code></dt>
<dt><code>void __builtin_write32 (void *<var>data</var>, unsigned long <var>datum</var>)</code></dt>
<dt><code>void __builtin_write64 (void *<var>data</var>, unsigned long long <var>datum</var>)</code></dt>
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