137 lines
6.2 KiB
HTML
137 lines
6.2 KiB
HTML
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<head>
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<title>GNU Compiler Collection (GCC) Internals: Vector Operations</title>
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<a name="Vector-Operations"></a>
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<div class="header">
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<p>
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Next: <a href="Conversions.html#Conversions" accesskey="n" rel="next">Conversions</a>, Previous: <a href="Bit_002dFields.html#Bit_002dFields" accesskey="p" rel="prev">Bit-Fields</a>, Up: <a href="RTL.html#RTL" accesskey="u" rel="up">RTL</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Vector-Operations-1"></a>
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<h3 class="section">13.12 Vector Operations</h3>
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<a name="index-vector-operations"></a>
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<p>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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</p>
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<dl compact="compact">
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<dd><a name="index-vec_005fmerge"></a>
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</dd>
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<dt><code>(vec_merge:<var>m</var> <var>vec1</var> <var>vec2</var> <var>items</var>)</code></dt>
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<dd><p>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>
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<a name="index-vec_005fselect"></a>
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</dd>
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<dt><code>(vec_select:<var>m</var> <var>vec1</var> <var>selection</var>)</code></dt>
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<dd><p>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>
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<a name="index-vec_005fconcat"></a>
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</dd>
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<dt><code>(vec_concat:<var>m</var> <var>x1</var> <var>x2</var>)</code></dt>
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<dd><p>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>
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<a name="index-vec_005fduplicate"></a>
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</dd>
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<dt><code>(vec_duplicate:<var>m</var> <var>x</var>)</code></dt>
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<dd><p>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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</p>
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</dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Conversions.html#Conversions" accesskey="n" rel="next">Conversions</a>, Previous: <a href="Bit_002dFields.html#Bit_002dFields" accesskey="p" rel="prev">Bit-Fields</a>, Up: <a href="RTL.html#RTL" accesskey="u" rel="up">RTL</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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