| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <html> |
| <!-- Copyright (C) 1988-2015 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.3 or |
| any later version published by the Free Software Foundation; with the |
| Invariant Sections being "Funding Free Software", the Front-Cover |
| Texts being (a) (see below), and with the Back-Cover Texts being (b) |
| (see below). A copy of the license is included in the section entitled |
| "GNU Free Documentation License". |
| |
| (a) The FSF's Front-Cover Text is: |
| |
| A GNU Manual |
| |
| (b) The FSF's Back-Cover Text is: |
| |
| You have freedom to copy and modify this GNU Manual, like GNU |
| software. Copies published by the Free Software Foundation raise |
| funds for GNU development. --> |
| <!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ --> |
| <head> |
| <title>GNU Compiler Collection (GCC) Internals: Vector Operations</title> |
| |
| <meta name="description" content="GNU Compiler Collection (GCC) Internals: Vector Operations"> |
| <meta name="keywords" content="GNU Compiler Collection (GCC) Internals: Vector Operations"> |
| <meta name="resource-type" content="document"> |
| <meta name="distribution" content="global"> |
| <meta name="Generator" content="makeinfo"> |
| <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> |
| <link href="index.html#Top" rel="start" title="Top"> |
| <link href="Option-Index.html#Option-Index" rel="index" title="Option Index"> |
| <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> |
| <link href="RTL.html#RTL" rel="up" title="RTL"> |
| <link href="Conversions.html#Conversions" rel="next" title="Conversions"> |
| <link href="Bit_002dFields.html#Bit_002dFields" rel="prev" title="Bit-Fields"> |
| <style type="text/css"> |
| <!-- |
| a.summary-letter {text-decoration: none} |
| blockquote.smallquotation {font-size: smaller} |
| div.display {margin-left: 3.2em} |
| div.example {margin-left: 3.2em} |
| div.indentedblock {margin-left: 3.2em} |
| div.lisp {margin-left: 3.2em} |
| div.smalldisplay {margin-left: 3.2em} |
| div.smallexample {margin-left: 3.2em} |
| div.smallindentedblock {margin-left: 3.2em; font-size: smaller} |
| div.smalllisp {margin-left: 3.2em} |
| kbd {font-style:oblique} |
| pre.display {font-family: inherit} |
| pre.format {font-family: inherit} |
| pre.menu-comment {font-family: serif} |
| pre.menu-preformatted {font-family: serif} |
| pre.smalldisplay {font-family: inherit; font-size: smaller} |
| pre.smallexample {font-size: smaller} |
| pre.smallformat {font-family: inherit; font-size: smaller} |
| pre.smalllisp {font-size: smaller} |
| span.nocodebreak {white-space:nowrap} |
| span.nolinebreak {white-space:nowrap} |
| span.roman {font-family:serif; font-weight:normal} |
| span.sansserif {font-family:sans-serif; font-weight:normal} |
| ul.no-bullet {list-style: none} |
| --> |
| </style> |
| |
| |
| </head> |
| |
| <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> |
| <a name="Vector-Operations"></a> |
| <div class="header"> |
| <p> |
| 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> |
| </div> |
| <hr> |
| <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> |
| |
| <hr> |
| <div class="header"> |
| <p> |
| 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> |
| </div> |
| |
| |
| |
| </body> |
| </html> |
