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| <a name="Vector-Operations-1"></a> |
| <h3 class="section">13.12 Vector Operations</h3> |
| <a name="index-vector-operations"></a> |
| |
| <p>All normal RTL expressions can be used with vector modes; they are |
| interpreted as operating on each part of the vector independently. |
| Additionally, there are a few new expressions to describe specific vector |
| operations. |
| </p> |
| <dl compact="compact"> |
| <dd><a name="index-vec_005fmerge"></a> |
| </dd> |
| <dt><code>(vec_merge:<var>m</var> <var>vec1</var> <var>vec2</var> <var>items</var>)</code></dt> |
| <dd><p>This describes a merge operation between two vectors. The result is a vector |
| of mode <var>m</var>; its elements are selected from either <var>vec1</var> or |
| <var>vec2</var>. Which elements are selected is described by <var>items</var>, which |
| is a bit mask represented by a <code>const_int</code>; a zero bit indicates the |
| corresponding element in the result vector is taken from <var>vec2</var> while |
| a set bit indicates it is taken from <var>vec1</var>. |
| </p> |
| <a name="index-vec_005fselect"></a> |
| </dd> |
| <dt><code>(vec_select:<var>m</var> <var>vec1</var> <var>selection</var>)</code></dt> |
| <dd><p>This describes an operation that selects parts of a vector. <var>vec1</var> is |
| the source vector, and <var>selection</var> is a <code>parallel</code> that contains a |
| <code>const_int</code> for each of the subparts of the result vector, giving the |
| number of the source subpart that should be stored into it. |
| The result mode <var>m</var> is either the submode for a single element of |
| <var>vec1</var> (if only one subpart is selected), or another vector mode |
| with that element submode (if multiple subparts are selected). |
| </p> |
| <a name="index-vec_005fconcat"></a> |
| </dd> |
| <dt><code>(vec_concat:<var>m</var> <var>x1</var> <var>x2</var>)</code></dt> |
| <dd><p>Describes a vector concat operation. The result is a concatenation of the |
| vectors or scalars <var>x1</var> and <var>x2</var>; its length is the sum of the |
| lengths of the two inputs. |
| </p> |
| <a name="index-vec_005fduplicate"></a> |
| </dd> |
| <dt><code>(vec_duplicate:<var>m</var> <var>x</var>)</code></dt> |
| <dd><p>This operation converts a scalar into a vector or a small vector into a |
| larger one by duplicating the input values. The output vector mode must have |
| the same submodes as the input vector mode or the scalar modes, and the |
| number of output parts must be an integer multiple of the number of input |
| parts. |
| </p> |
| </dd> |
| </dl> |
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