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  25. <title>Vector Operations (GNU Compiler Collection (GCC) Internals)</title>

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  70. <a name="Vector-Operations"></a>

  71. <div class="header">

  72. <p>

  73. 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> &nbsp; [<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>

  74. </div>

  75. <hr>

  76. <a name="Vector-Operations-1"></a>

  77. <h3 class="section">14.12 Vector Operations</h3>

  78. <a name="index-vector-operations"></a>

  79. 

  80. <p>All normal RTL expressions can be used with vector modes; they are

  81. interpreted as operating on each part of the vector independently.

  82. Additionally, there are a few new expressions to describe specific vector

  83. operations.

  84. </p>

  85. <dl compact="compact">

  86. <dd><a name="index-vec_005fmerge"></a>

  87. </dd>

  88. <dt><code>(vec_merge:<var>m</var> <var>vec1</var> <var>vec2</var> <var>items</var>)</code></dt>

  89. <dd><p>This describes a merge operation between two vectors.  The result is a vector

  90. of mode <var>m</var>; its elements are selected from either <var>vec1</var> or

  91. <var>vec2</var>.  Which elements are selected is described by <var>items</var>, which

  92. is a bit mask represented by a <code>const_int</code>; a zero bit indicates the

  93. corresponding element in the result vector is taken from <var>vec2</var> while

  94. a set bit indicates it is taken from <var>vec1</var>.

  95. </p>

  96. <a name="index-vec_005fselect"></a>

  97. </dd>

  98. <dt><code>(vec_select:<var>m</var> <var>vec1</var> <var>selection</var>)</code></dt>

  99. <dd><p>This describes an operation that selects parts of a vector.  <var>vec1</var> is

  100. the source vector, and <var>selection</var> is a <code>parallel</code> that contains a

  101. <code>const_int</code> (or another expression, if the selection can be made at

  102. runtime) for each of the subparts of the result vector, giving the number of

  103. the source subpart that should be stored into it.  The result mode <var>m</var> is

  104. either the submode for a single element of <var>vec1</var> (if only one subpart is

  105. selected), or another vector mode with that element submode (if multiple

  106. subparts are selected).

  107. </p>

  108. <a name="index-vec_005fconcat"></a>

  109. </dd>

  110. <dt><code>(vec_concat:<var>m</var> <var>x1</var> <var>x2</var>)</code></dt>

  111. <dd><p>Describes a vector concat operation.  The result is a concatenation of the

  112. vectors or scalars <var>x1</var> and <var>x2</var>; its length is the sum of the

  113. lengths of the two inputs.

  114. </p>

  115. <a name="index-vec_005fduplicate"></a>

  116. </dd>

  117. <dt><code>(vec_duplicate:<var>m</var> <var>x</var>)</code></dt>

  118. <dd><p>This operation converts a scalar into a vector or a small vector into a

  119. larger one by duplicating the input values.  The output vector mode must have

  120. the same submodes as the input vector mode or the scalar modes, and the

  121. number of output parts must be an integer multiple of the number of input

  122. parts.

  123. </p>

  124. <a name="index-vec_005fseries"></a>

  125. </dd>

  126. <dt><code>(vec_series:<var>m</var> <var>base</var> <var>step</var>)</code></dt>

  127. <dd><p>This operation creates a vector in which element <var>i</var> is equal to

  128. &lsquo;<samp><var>base</var> + <var>i</var>*<var>step</var></samp>&rsquo;.  <var>m</var> must be a vector integer mode.

  129. </p></dd>

  130. </dl>

  131. 

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