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102 lines
4.4 KiB
HTML
102 lines
4.4 KiB
HTML
<!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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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 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
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License".
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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>i386-SIMD (Using as)</title>
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<meta name="description" content="i386-SIMD (Using as)">
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<meta name="keywords" content="i386-SIMD (Using as)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="i386_002dDependent.html#i386_002dDependent" rel="up" title="i386-Dependent">
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<link href="i386_002dLWP.html#i386_002dLWP" rel="next" title="i386-LWP">
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<link href="i386_002dFloat.html#i386_002dFloat" rel="prev" title="i386-Float">
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</head>
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<body lang="en">
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<a name="i386_002dSIMD"></a>
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<div class="header">
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<p>
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Next: <a href="i386_002dLWP.html#i386_002dLWP" accesskey="n" rel="next">i386-LWP</a>, Previous: <a href="i386_002dFloat.html#i386_002dFloat" accesskey="p" rel="prev">i386-Float</a>, Up: <a href="i386_002dDependent.html#i386_002dDependent" accesskey="u" rel="up">i386-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Intel_0027s-MMX-and-AMD_0027s-3DNow_0021-SIMD-Operations"></a>
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<h4 class="subsection">9.15.10 Intel’s MMX and AMD’s 3DNow! SIMD Operations</h4>
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<a name="index-MMX_002c-i386"></a>
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<a name="index-3DNow_0021_002c-i386"></a>
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<a name="index-SIMD_002c-i386"></a>
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<a name="index-MMX_002c-x86_002d64"></a>
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<a name="index-3DNow_0021_002c-x86_002d64"></a>
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<a name="index-SIMD_002c-x86_002d64"></a>
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<p><code>as</code> supports Intel’s MMX instruction set (SIMD
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instructions for integer data), available on Intel’s Pentium MMX
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processors and Pentium II processors, AMD’s K6 and K6-2 processors,
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Cyrix’ M2 processor, and probably others. It also supports AMD’s 3DNow!
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instruction set (SIMD instructions for 32-bit floating point data)
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available on AMD’s K6-2 processor and possibly others in the future.
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</p>
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<p>Currently, <code>as</code> does not support Intel’s floating point
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SIMD, Katmai (KNI).
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</p>
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<p>The eight 64-bit MMX operands, also used by 3DNow!, are called ‘<samp>%mm0</samp>’,
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‘<samp>%mm1</samp>’, ... ‘<samp>%mm7</samp>’. They contain eight 8-bit integers, four
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16-bit integers, two 32-bit integers, one 64-bit integer, or two 32-bit
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floating point values. The MMX registers cannot be used at the same time
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as the floating point stack.
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</p>
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<p>See Intel and AMD documentation, keeping in mind that the operand order in
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instructions is reversed from the Intel syntax.
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</p>
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</body>
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</html>
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