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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.

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  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

  12. section entitled "GNU Free Documentation License".

  13.  -->

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  15. <head>

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

  17. <title>ARM-Instruction-Set (Using as)</title>

  18. 

  19. <meta name="description" content="ARM-Instruction-Set (Using as)">

  20. <meta name="keywords" content="ARM-Instruction-Set (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="ARM-Syntax.html#ARM-Syntax" rel="up" title="ARM Syntax">

  28. <link href="ARM_002dChars.html#ARM_002dChars" rel="next" title="ARM-Chars">

  29. <link href="ARM-Syntax.html#ARM-Syntax" rel="prev" title="ARM Syntax">

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  61. <body lang="en">

  62. <a name="ARM_002dInstruction_002dSet"></a>

  63. <div class="header">

  64. <p>

  65. Next: <a href="ARM_002dChars.html#ARM_002dChars" accesskey="n" rel="next">ARM-Chars</a>, Up: <a href="ARM-Syntax.html#ARM-Syntax" accesskey="u" rel="up">ARM Syntax</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="Instruction-Set-Syntax"></a>

  69. <h4 class="subsubsection">9.4.2.1 Instruction Set Syntax</h4>

  70. <p>Two slightly different syntaxes are support for ARM and THUMB

  71. instructions.  The default, <code>divided</code>, uses the old style where

  72. ARM and THUMB instructions had their own, separate syntaxes.  The new,

  73. <code>unified</code> syntax, which can be selected via the <code>.syntax</code>

  74. directive, and has the following main features:

  75. </p>

  76. <ul>

  77. <li> Immediate operands do not require a <code>#</code> prefix.

  78. 

  79. </li><li> The <code>IT</code> instruction may appear, and if it does it is validated

  80. against subsequent conditional affixes.  In ARM mode it does not

  81. generate machine code, in THUMB mode it does.

  82. 

  83. </li><li> For ARM instructions the conditional affixes always appear at the end

  84. of the instruction.  For THUMB instructions conditional affixes can be

  85. used, but only inside the scope of an <code>IT</code> instruction.

  86. 

  87. </li><li> All of the instructions new to the V6T2 architecture (and later) are

  88. available.  (Only a few such instructions can be written in the

  89. <code>divided</code> syntax).

  90. 

  91. </li><li> The <code>.N</code> and <code>.W</code> suffixes are recognized and honored.

  92. 

  93. </li><li> All instructions set the flags if and only if they have an <code>s</code>

  94. affix.

  95. </li></ul>

  96. 

  97. 

  98. 

  99. 

  100. </body>

  101. </html>