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<title>Vector Operations - GNU Compiler Collection (GCC) Internals</title>
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<a name="Vector-Operations"></a>
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Next: <a rel="next" accesskey="n" href="Conversions.html#Conversions">Conversions</a>,
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Previous: <a rel="previous" accesskey="p" href="Bit_002dFields.html#Bit_002dFields">Bit-Fields</a>,
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<h3 class="section">13.12 Vector Operations</h3>
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<p><a name="index-vector-operations-3005"></a>
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All normal RTL expressions can be used with vector modes; they are
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interpreted as operating on each part of the vector independently.
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Additionally, there are a few new expressions to describe specific vector
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operations.
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<a name="index-vec_005fmerge-3006"></a>
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<dl><dt><code>(vec_merge:</code><var>m</var> <var>vec1</var> <var>vec2</var> <var>items</var><code>)</code><dd>This describes a merge operation between two vectors. The result is a vector
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of mode <var>m</var>; its elements are selected from either <var>vec1</var> or
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<var>vec2</var>. Which elements are selected is described by <var>items</var>, which
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is a bit mask represented by a <code>const_int</code>; a zero bit indicates the
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corresponding element in the result vector is taken from <var>vec2</var> while
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a set bit indicates it is taken from <var>vec1</var>.
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<p><a name="index-vec_005fselect-3007"></a><br><dt><code>(vec_select:</code><var>m</var> <var>vec1</var> <var>selection</var><code>)</code><dd>This describes an operation that selects parts of a vector. <var>vec1</var> is
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the source vector, and <var>selection</var> is a <code>parallel</code> that contains a
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<code>const_int</code> for each of the subparts of the result vector, giving the
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number of the source subpart that should be stored into it.
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The result mode <var>m</var> is either the submode for a single element of
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<var>vec1</var> (if only one subpart is selected), or another vector mode
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with that element submode (if multiple subparts are selected).
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<p><a name="index-vec_005fconcat-3008"></a><br><dt><code>(vec_concat:</code><var>m</var> <var>x1</var> <var>x2</var><code>)</code><dd>Describes a vector concat operation. The result is a concatenation of the
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vectors or scalars <var>x1</var> and <var>x2</var>; its length is the sum of the
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lengths of the two inputs.
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<p><a name="index-vec_005fduplicate-3009"></a><br><dt><code>(vec_duplicate:</code><var>m</var> <var>x</var><code>)</code><dd>This operation converts a scalar into a vector or a small vector into a
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larger one by duplicating the input values. The output vector mode must have
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the same submodes as the input vector mode or the scalar modes, and the
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number of output parts must be an integer multiple of the number of input
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parts.
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</dl>
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