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+<title>GNU Compiler Collection (GCC) Internals: Bit-Fields</title>
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+<a name="Bit_002dFields-1"></a>
+<h3 class="section">14.11 Bit-Fields</h3>
+<a name="index-bit_002dfields"></a>
+
+<p>Special expression codes exist to represent bit-field instructions.
+</p>
+<dl compact="compact">
+<dd><a name="index-sign_005fextract"></a>
+<a name="index-BITS_005fBIG_005fENDIAN_002c-effect-on-sign_005fextract"></a>
+</dd>
+<dt><code>(sign_extract:<var>m</var> <var>loc</var> <var>size</var> <var>pos</var>)</code></dt>
+<dd><p>This represents a reference to a sign-extended bit-field contained or
+starting in <var>loc</var> (a memory or register reference).  The bit-field
+is <var>size</var> bits wide and starts at bit <var>pos</var>.  The compilation
+option <code>BITS_BIG_ENDIAN</code> says which end of the memory unit
+<var>pos</var> counts from.
+</p>
+<p>If <var>loc</var> is in memory, its mode must be a single-byte integer mode.
+If <var>loc</var> is in a register, the mode to use is specified by the
+operand of the <code>insv</code> or <code>extv</code> pattern
+(see <a href="Standard-Names.html#Standard-Names">Standard Names</a>) and is usually a full-word integer mode,
+which is the default if none is specified.
+</p>
+<p>The mode of <var>pos</var> is machine-specific and is also specified
+in the <code>insv</code> or <code>extv</code> pattern.
+</p>
+<p>The mode <var>m</var> is the same as the mode that would be used for
+<var>loc</var> if it were a register.
+</p>
+<p>A <code>sign_extract</code> cannot appear as an lvalue, or part thereof,
+in RTL.
+</p>
+<a name="index-zero_005fextract"></a>
+</dd>
+<dt><code>(zero_extract:<var>m</var> <var>loc</var> <var>size</var> <var>pos</var>)</code></dt>
+<dd><p>Like <code>sign_extract</code> but refers to an unsigned or zero-extended
+bit-field.  The same sequence of bits are extracted, but they
+are filled to an entire word with zeros instead of by sign-extension.
+</p>
+<p>Unlike <code>sign_extract</code>, this type of expressions can be lvalues
+in RTL; they may appear on the left side of an assignment, indicating
+insertion of a value into the specified bit-field.
+</p></dd>
+</dl>
+
+
+
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