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104 lines
5.0 KiB
HTML
104 lines
5.0 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Paired-Single Arithmetic (Using the GNU Compiler Collection (GCC))</title>
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<meta name="description" content="Paired-Single Arithmetic (Using the GNU Compiler Collection (GCC))">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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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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<link href="MIPS-Loongson-Built_002din-Functions.html#MIPS-Loongson-Built_002din-Functions" rel="up" title="MIPS Loongson Built-in Functions">
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<link href="Paired_002dSingle-Built_002din-Functions.html#Paired_002dSingle-Built_002din-Functions" rel="next" title="Paired-Single Built-in Functions">
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<link href="MIPS-Loongson-Built_002din-Functions.html#MIPS-Loongson-Built_002din-Functions" rel="prev" title="MIPS Loongson Built-in Functions">
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</style>
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</head>
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<body lang="en">
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<a name="Paired_002dSingle-Arithmetic"></a>
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<div class="header">
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<p>
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Next: <a href="Paired_002dSingle-Built_002din-Functions.html#Paired_002dSingle-Built_002din-Functions" accesskey="n" rel="next">Paired-Single Built-in Functions</a>, Up: <a href="MIPS-Loongson-Built_002din-Functions.html#MIPS-Loongson-Built_002din-Functions" accesskey="u" rel="up">MIPS Loongson Built-in Functions</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="Paired_002dSingle-Arithmetic-1"></a>
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<h4 class="subsubsection">6.59.15.1 Paired-Single Arithmetic</h4>
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<p>The table below lists the <code>v2sf</code> operations for which hardware
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support exists. <code>a</code>, <code>b</code> and <code>c</code> are <code>v2sf</code>
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values and <code>x</code> is an integral value.
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</p>
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<table>
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<tr><td width="50%">C code</td><td width="50%">MIPS instruction</td></tr>
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<tr><td width="50%"><code>a + b</code></td><td width="50%"><code>add.ps</code></td></tr>
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<tr><td width="50%"><code>a - b</code></td><td width="50%"><code>sub.ps</code></td></tr>
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<tr><td width="50%"><code>-a</code></td><td width="50%"><code>neg.ps</code></td></tr>
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<tr><td width="50%"><code>a * b</code></td><td width="50%"><code>mul.ps</code></td></tr>
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<tr><td width="50%"><code>a * b + c</code></td><td width="50%"><code>madd.ps</code></td></tr>
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<tr><td width="50%"><code>a * b - c</code></td><td width="50%"><code>msub.ps</code></td></tr>
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<tr><td width="50%"><code>-(a * b + c)</code></td><td width="50%"><code>nmadd.ps</code></td></tr>
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<tr><td width="50%"><code>-(a * b - c)</code></td><td width="50%"><code>nmsub.ps</code></td></tr>
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<tr><td width="50%"><code>x ? a : b</code></td><td width="50%"><code>movn.ps</code>/<code>movz.ps</code></td></tr>
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</table>
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<p>Note that the multiply-accumulate instructions can be disabled
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using the command-line option <code>-mno-fused-madd</code>.
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</p>
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</body>
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</html>
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