<html lang="en"> <head> <title>Paired-Single Arithmetic - Using the GNU Compiler Collection (GCC)</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="Using the GNU Compiler Collection (GCC)"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="MIPS-Loongson-Built_002din-Functions.html#MIPS-Loongson-Built_002din-Functions" title="MIPS Loongson Built-in Functions"> <link rel="next" href="Paired_002dSingle-Built_002din-Functions.html#Paired_002dSingle-Built_002din-Functions" title="Paired-Single Built-in Functions"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <!-- 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.--> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="Paired-Single-Arithmetic"></a> <a name="Paired_002dSingle-Arithmetic"></a> <p> Next: <a rel="next" accesskey="n" href="Paired_002dSingle-Built_002din-Functions.html#Paired_002dSingle-Built_002din-Functions">Paired-Single Built-in Functions</a>, Up: <a rel="up" accesskey="u" href="MIPS-Loongson-Built_002din-Functions.html#MIPS-Loongson-Built_002din-Functions">MIPS Loongson Built-in Functions</a> <hr> </div> <h5 class="subsubsection">6.58.14.1 Paired-Single Arithmetic</h5> <p>The table below lists the <code>v2sf</code> operations for which hardware support exists. <code>a</code>, <code>b</code> and <code>c</code> are <code>v2sf</code> values and <code>x</code> is an integral value. <p><table summary=""><tr align="left"><td valign="top" width="50%">C code </td><td valign="top" width="50%">MIPS instruction <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> <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> <br></td></tr><tr align="left"><td valign="top" width="50%"><code>-a</code> </td><td valign="top" width="50%"><code>neg.ps</code> <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> <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> <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> <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> <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> <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> <br></td></tr></table> <p>Note that the multiply-accumulate instructions can be disabled using the command-line option <code>-mno-fused-madd</code>. </body></html>