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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  2. <html>

  3. <!-- This file documents the GNU Assembler "as".

  4. 

  5. Copyright (C) 1991-2020 Free Software Foundation, Inc.

  6. 

  7. Permission is granted to copy, distribute and/or modify this document

  8. under the terms of the GNU Free Documentation License, Version 1.3

  9. or any later version published by the Free Software Foundation;

  10. with no Invariant Sections, with no Front-Cover Texts, and with no

  11. Back-Cover Texts.  A copy of the license is included in the

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  15. <head>

  16. <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

  17. <title>i386-SIMD (Using as)</title>

  18. 

  19. <meta name="description" content="i386-SIMD (Using as)">

  20. <meta name="keywords" content="i386-SIMD (Using as)">

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  24. <link href="index.html#Top" rel="start" title="Top">

  25. <link href="AS-Index.html#AS-Index" rel="index" title="AS Index">

  26. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  27. <link href="i386_002dDependent.html#i386_002dDependent" rel="up" title="i386-Dependent">

  28. <link href="i386_002dLWP.html#i386_002dLWP" rel="next" title="i386-LWP">

  29. <link href="i386_002dFloat.html#i386_002dFloat" rel="prev" title="i386-Float">

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  61. <body lang="en">

  62. <a name="i386_002dSIMD"></a>

  63. <div class="header">

  64. <p>

  65. 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> &nbsp; [<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>

  66. </div>

  67. <hr>

  68. <a name="Intel_0027s-MMX-and-AMD_0027s-3DNow_0021-SIMD-Operations"></a>

  69. <h4 class="subsection">9.16.10 Intel&rsquo;s MMX and AMD&rsquo;s 3DNow! SIMD Operations</h4>

  70. 

  71. <a name="index-MMX_002c-i386"></a>

  72. <a name="index-3DNow_0021_002c-i386"></a>

  73. <a name="index-SIMD_002c-i386"></a>

  74. <a name="index-MMX_002c-x86_002d64"></a>

  75. <a name="index-3DNow_0021_002c-x86_002d64"></a>

  76. <a name="index-SIMD_002c-x86_002d64"></a>

  77. 

  78. <p><code>as</code> supports Intel&rsquo;s MMX instruction set (SIMD

  79. instructions for integer data), available on Intel&rsquo;s Pentium MMX

  80. processors and Pentium II processors, AMD&rsquo;s K6 and K6-2 processors,

  81. Cyrix&rsquo; M2 processor, and probably others.  It also supports AMD&rsquo;s 3DNow!

  82. instruction set (SIMD instructions for 32-bit floating point data)

  83. available on AMD&rsquo;s K6-2 processor and possibly others in the future.

  84. </p>

  85. <p>Currently, <code>as</code> does not support Intel&rsquo;s floating point

  86. SIMD, Katmai (KNI).

  87. </p>

  88. <p>The eight 64-bit MMX operands, also used by 3DNow!, are called &lsquo;<samp>%mm0</samp>&rsquo;,

  89. &lsquo;<samp>%mm1</samp>&rsquo;, ... &lsquo;<samp>%mm7</samp>&rsquo;.  They contain eight 8-bit integers, four

  90. 16-bit integers, two 32-bit integers, one 64-bit integer, or two 32-bit

  91. floating point values.  The MMX registers cannot be used at the same time

  92. as the floating point stack.

  93. </p>

  94. <p>See Intel and AMD documentation, keeping in mind that the operand order in

  95. instructions is reversed from the Intel syntax.

  96. </p>

  97. 

  98. 

  99. 

  100. </body>

  101. </html>