1<html lang="en"> 2<head> 3<title>Paired-Single Arithmetic - Using the GNU Compiler Collection (GCC)</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Using the GNU Compiler Collection (GCC)"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="MIPS-Loongson-Built_002din-Functions.html#MIPS-Loongson-Built_002din-Functions" title="MIPS Loongson Built-in Functions"> 9<link rel="next" href="Paired_002dSingle-Built_002din-Functions.html#Paired_002dSingle-Built_002din-Functions" title="Paired-Single Built-in Functions"> 10<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 11<!-- 12Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 131998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 142010 Free Software Foundation, Inc. 15 16Permission is granted to copy, distribute and/or modify this document 17under the terms of the GNU Free Documentation License, Version 1.3 or 18any later version published by the Free Software Foundation; with the 19Invariant Sections being ``Funding Free Software'', the Front-Cover 20Texts being (a) (see below), and with the Back-Cover Texts being (b) 21(see below). A copy of the license is included in the section entitled 22``GNU Free Documentation License''. 23 24(a) The FSF's Front-Cover Text is: 25 26 A GNU Manual 27 28(b) The FSF's Back-Cover Text is: 29 30 You have freedom to copy and modify this GNU Manual, like GNU 31 software. Copies published by the Free Software Foundation raise 32 funds for GNU development.--> 33<meta http-equiv="Content-Style-Type" content="text/css"> 34<style type="text/css"><!-- 35 pre.display { font-family:inherit } 36 pre.format { font-family:inherit } 37 pre.smalldisplay { font-family:inherit; font-size:smaller } 38 pre.smallformat { font-family:inherit; font-size:smaller } 39 pre.smallexample { font-size:smaller } 40 pre.smalllisp { font-size:smaller } 41 span.sc { font-variant:small-caps } 42 span.roman { font-family:serif; font-weight:normal; } 43 span.sansserif { font-family:sans-serif; font-weight:normal; } 44--></style> 45<link rel="stylesheet" type="text/css" href="../cs.css"> 46</head> 47<body> 48<div class="node"> 49<a name="Paired-Single-Arithmetic"></a> 50<a name="Paired_002dSingle-Arithmetic"></a> 51<p> 52Next: <a rel="next" accesskey="n" href="Paired_002dSingle-Built_002din-Functions.html#Paired_002dSingle-Built_002din-Functions">Paired-Single Built-in Functions</a>, 53Up: <a rel="up" accesskey="u" href="MIPS-Loongson-Built_002din-Functions.html#MIPS-Loongson-Built_002din-Functions">MIPS Loongson Built-in Functions</a> 54<hr> 55</div> 56 57<h5 class="subsubsection">6.54.9.1 Paired-Single Arithmetic</h5> 58 59<p>The table below lists the <code>v2sf</code> operations for which hardware 60support exists. <code>a</code>, <code>b</code> and <code>c</code> are <code>v2sf</code> 61values and <code>x</code> is an integral value. 62 63 <p><table summary=""><tr align="left"><td valign="top" width="50%">C code </td><td valign="top" width="50%">MIPS instruction 64<br></td></tr><tr align="left"><td valign="top" width="50%"><code>a + b</code> </td><td valign="top" width="50%"><code>add.ps</code> 65<br></td></tr><tr align="left"><td valign="top" width="50%"><code>a - b</code> </td><td valign="top" width="50%"><code>sub.ps</code> 66<br></td></tr><tr align="left"><td valign="top" width="50%"><code>-a</code> </td><td valign="top" width="50%"><code>neg.ps</code> 67<br></td></tr><tr align="left"><td valign="top" width="50%"><code>a * b</code> </td><td valign="top" width="50%"><code>mul.ps</code> 68<br></td></tr><tr align="left"><td valign="top" width="50%"><code>a * b + c</code> </td><td valign="top" width="50%"><code>madd.ps</code> 69<br></td></tr><tr align="left"><td valign="top" width="50%"><code>a * b - c</code> </td><td valign="top" width="50%"><code>msub.ps</code> 70<br></td></tr><tr align="left"><td valign="top" width="50%"><code>-(a * b + c)</code> </td><td valign="top" width="50%"><code>nmadd.ps</code> 71<br></td></tr><tr align="left"><td valign="top" width="50%"><code>-(a * b - c)</code> </td><td valign="top" width="50%"><code>nmsub.ps</code> 72<br></td></tr><tr align="left"><td valign="top" width="50%"><code>x ? a : b</code> </td><td valign="top" width="50%"><code>movn.ps</code>/<code>movz.ps</code> 73 <br></td></tr></table> 74 75 <p>Note that the multiply-accumulate instructions can be disabled 76using the command-line option <code>-mno-fused-madd</code>. 77 78 </body></html> 79 80