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toolchain-gcc-arm-embedded/share/doc/gcc-arm-none-eabi/html/as.html/D10V_002dSize.html

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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

  12. section entitled "GNU Free Documentation License".

  13.  -->

  14. <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ -->

  15. <head>

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

  17. <title>D10V-Size (Using as)</title>

  18. 

  19. <meta name="description" content="D10V-Size (Using as)">

  20. <meta name="keywords" content="D10V-Size (Using as)">

  21. <meta name="resource-type" content="document">

  22. <meta name="distribution" content="global">

  23. <meta name="Generator" content="makeinfo">

  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="D10V_002dSyntax.html#D10V_002dSyntax" rel="up" title="D10V-Syntax">

  28. <link href="D10V_002dSubs.html#D10V_002dSubs" rel="next" title="D10V-Subs">

  29. <link href="D10V_002dSyntax.html#D10V_002dSyntax" rel="prev" title="D10V-Syntax">

  30. <style type="text/css">

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  56. </style>

  57. 

  58. 

  59. </head>

  60. 

  61. <body lang="en">

  62. <a name="D10V_002dSize"></a>

  63. <div class="header">

  64. <p>

  65. Next: <a href="D10V_002dSubs.html#D10V_002dSubs" accesskey="n" rel="next">D10V-Subs</a>, Up: <a href="D10V_002dSyntax.html#D10V_002dSyntax" accesskey="u" rel="up">D10V-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="Size-Modifiers"></a>

  69. <h4 class="subsubsection">9.11.2.1 Size Modifiers</h4>

  70. <a name="index-D10V-size-modifiers"></a>

  71. <a name="index-size-modifiers_002c-D10V"></a>

  72. <p>The D10V version of <code>as</code> uses the instruction names in the D10V

  73. Architecture Manual.  However, the names in the manual are sometimes ambiguous.

  74. There are instruction names that can assemble to a short or long form opcode.

  75. How does the assembler pick the correct form?  <code>as</code> will always pick the

  76. smallest form if it can.  When dealing with a symbol that is not defined yet when a

  77. line is being assembled, it will always use the long form.  If you need to force the

  78. assembler to use either the short or long form of the instruction, you can append

  79. either &lsquo;<samp>.s</samp>&rsquo; (short) or &lsquo;<samp>.l</samp>&rsquo; (long) to it.  For example, if you are writing

  80. an assembly program and you want to do a branch to a symbol that is defined later

  81. in your program, you can write &lsquo;<samp>bra.s   foo</samp>&rsquo;.

  82. Objdump and GDB will always append &lsquo;<samp>.s</samp>&rsquo; or &lsquo;<samp>.l</samp>&rsquo; to instructions which

  83. have both short and long forms.

  84. </p>

  85. 

  86. 

  87. 

  88. </body>

  89. </html>