| <html lang="en"> |
| <head> |
| <title>i386-SIMD - Using as</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="Using as"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="i386_002dDependent.html#i386_002dDependent" title="i386-Dependent"> |
| <link rel="prev" href="i386_002dFloat.html#i386_002dFloat" title="i386-Float"> |
| <link rel="next" href="i386_002dLWP.html#i386_002dLWP" title="i386-LWP"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| This file documents the GNU Assembler "as". |
| |
| Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
| 2000, 2001, 2002, 2006, 2007, 2008, 2009, 2010 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 no Invariant Sections, with no Front-Cover Texts, and with no |
| Back-Cover Texts. A copy of the license is included in the |
| section entitled ``GNU Free Documentation License''. |
| |
| --> |
| <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> |
| <link rel="stylesheet" type="text/css" href="../cs.css"> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="i386-SIMD"></a> |
| <a name="i386_002dSIMD"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="i386_002dLWP.html#i386_002dLWP">i386-LWP</a>, |
| Previous: <a rel="previous" accesskey="p" href="i386_002dFloat.html#i386_002dFloat">i386-Float</a>, |
| Up: <a rel="up" accesskey="u" href="i386_002dDependent.html#i386_002dDependent">i386-Dependent</a> |
| <hr> |
| </div> |
| |
| <h4 class="subsection">9.13.11 Intel's MMX and AMD's 3DNow! SIMD Operations</h4> |
| |
| <p><a name="index-MMX_002c-i386-974"></a><a name="index-g_t3DNow_0021_002c-i386-975"></a><a name="index-SIMD_002c-i386-976"></a><a name="index-MMX_002c-x86_002d64-977"></a><a name="index-g_t3DNow_0021_002c-x86_002d64-978"></a><a name="index-SIMD_002c-x86_002d64-979"></a> |
| <code>as</code> supports Intel's MMX instruction set (SIMD |
| instructions for integer data), available on Intel's Pentium MMX |
| processors and Pentium II processors, AMD's K6 and K6-2 processors, |
| Cyrix' M2 processor, and probably others. It also supports AMD's 3DNow! |
| instruction set (SIMD instructions for 32-bit floating point data) |
| available on AMD's K6-2 processor and possibly others in the future. |
| |
| <p>Currently, <code>as</code> does not support Intel's floating point |
| SIMD, Katmai (KNI). |
| |
| <p>The eight 64-bit MMX operands, also used by 3DNow!, are called ‘<samp><span class="samp">%mm0</span></samp>’, |
| ‘<samp><span class="samp">%mm1</span></samp>’, ... ‘<samp><span class="samp">%mm7</span></samp>’. They contain eight 8-bit integers, four |
| 16-bit integers, two 32-bit integers, one 64-bit integer, or two 32-bit |
| floating point values. The MMX registers cannot be used at the same time |
| as the floating point stack. |
| |
| <p>See Intel and AMD documentation, keeping in mind that the operand order in |
| instructions is reversed from the Intel syntax. |
| |
| </body></html> |
| |
