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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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  15. <head>

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

  17. <title>MSP430-Ext (Using as)</title>

  18. 

  19. <meta name="description" content="MSP430-Ext (Using as)">

  20. <meta name="keywords" content="MSP430-Ext (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="MSP430-Syntax.html#MSP430-Syntax" rel="up" title="MSP430 Syntax">

  28. <link href="MSP430-Floating-Point.html#MSP430-Floating-Point" rel="next" title="MSP430 Floating Point">

  29. <link href="MSP430_002dRegs.html#MSP430_002dRegs" rel="prev" title="MSP430-Regs">

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  57. 

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  59. </head>

  60. 

  61. <body lang="en">

  62. <a name="MSP430_002dExt"></a>

  63. <div class="header">

  64. <p>

  65. Previous: <a href="MSP430_002dRegs.html#MSP430_002dRegs" accesskey="p" rel="prev">MSP430-Regs</a>, Up: <a href="MSP430-Syntax.html#MSP430-Syntax" accesskey="u" rel="up">MSP430 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="Assembler-Extensions"></a>

  69. <h4 class="subsubsection">9.29.2.4 Assembler Extensions</h4>

  70. <a name="index-MSP430-Assembler-Extensions"></a>

  71. 

  72. <dl compact="compact">

  73. <dt><code>@rN</code></dt>

  74. <dd><p>As destination operand being treated as &lsquo;<samp>0(rn)</samp>&rsquo;

  75. </p>

  76. </dd>

  77. <dt><code>0(rN)</code></dt>

  78. <dd><p>As source operand being treated as &lsquo;<samp>@rn</samp>&rsquo;

  79. </p>

  80. </dd>

  81. <dt><code>jCOND +N</code></dt>

  82. <dd><p>Skips next N bytes followed by jump instruction and equivalent to

  83. &lsquo;<samp>jCOND $+N+2</samp>&rsquo;

  84. </p>

  85. </dd>

  86. </dl>

  87. 

  88. <p>Also, there are some instructions, which cannot be found in other assemblers.

  89. These are branch instructions, which has different opcodes upon jump distance.

  90. They all got PC relative addressing mode.

  91. </p>

  92. <dl compact="compact">

  93. <dt><code>beq label</code></dt>

  94. <dd><p>A polymorph instruction which is &lsquo;<samp>jeq label</samp>&rsquo; in case if jump distance

  95. within allowed range for cpu&rsquo;s jump instruction. If not, this unrolls into

  96. a sequence of

  97. </p><div class="smallexample">

  98. <pre class="smallexample">  jne $+6

  99.   br  label

  100. </pre></div>

  101. 

  102. </dd>

  103. <dt><code>bne label</code></dt>

  104. <dd><p>A polymorph instruction which is &lsquo;<samp>jne label</samp>&rsquo; or &lsquo;<samp>jeq +4; br label</samp>&rsquo;

  105. </p>

  106. </dd>

  107. <dt><code>blt label</code></dt>

  108. <dd><p>A polymorph instruction which is &lsquo;<samp>jl label</samp>&rsquo; or &lsquo;<samp>jge +4; br label</samp>&rsquo;

  109. </p>

  110. </dd>

  111. <dt><code>bltn label</code></dt>

  112. <dd><p>A polymorph instruction which is &lsquo;<samp>jn label</samp>&rsquo; or &lsquo;<samp>jn +2; jmp +4; br label</samp>&rsquo;

  113. </p>

  114. </dd>

  115. <dt><code>bltu label</code></dt>

  116. <dd><p>A polymorph instruction which is &lsquo;<samp>jlo label</samp>&rsquo; or &lsquo;<samp>jhs +2; br label</samp>&rsquo;

  117. </p>

  118. </dd>

  119. <dt><code>bge label</code></dt>

  120. <dd><p>A polymorph instruction which is &lsquo;<samp>jge label</samp>&rsquo; or &lsquo;<samp>jl +4; br label</samp>&rsquo;

  121. </p>

  122. </dd>

  123. <dt><code>bgeu label</code></dt>

  124. <dd><p>A polymorph instruction which is &lsquo;<samp>jhs label</samp>&rsquo; or &lsquo;<samp>jlo +4; br label</samp>&rsquo;

  125. </p>

  126. </dd>

  127. <dt><code>bgt label</code></dt>

  128. <dd><p>A polymorph instruction which is &lsquo;<samp>jeq +2; jge label</samp>&rsquo; or &lsquo;<samp>jeq +6; jl  +4; br label</samp>&rsquo;

  129. </p>

  130. </dd>

  131. <dt><code>bgtu label</code></dt>

  132. <dd><p>A polymorph instruction which is &lsquo;<samp>jeq +2; jhs label</samp>&rsquo; or &lsquo;<samp>jeq +6; jlo +4; br label</samp>&rsquo;

  133. </p>

  134. </dd>

  135. <dt><code>bleu label</code></dt>

  136. <dd><p>A polymorph instruction which is &lsquo;<samp>jeq label; jlo label</samp>&rsquo; or &lsquo;<samp>jeq +2; jhs +4; br label</samp>&rsquo;

  137. </p>

  138. </dd>

  139. <dt><code>ble label</code></dt>

  140. <dd><p>A polymorph instruction which is &lsquo;<samp>jeq label; jl  label</samp>&rsquo; or &lsquo;<samp>jeq +2; jge +4; br label</samp>&rsquo;

  141. </p>

  142. </dd>

  143. <dt><code>jump label</code></dt>

  144. <dd><p>A polymorph instruction which is &lsquo;<samp>jmp label</samp>&rsquo; or &lsquo;<samp>br label</samp>&rsquo;

  145. </p></dd>

  146. </dl>

  147. 

  148. 

  149. <hr>

  150. <div class="header">

  151. <p>

  152. Previous: <a href="MSP430_002dRegs.html#MSP430_002dRegs" accesskey="p" rel="prev">MSP430-Regs</a>, Up: <a href="MSP430-Syntax.html#MSP430-Syntax" accesskey="u" rel="up">MSP430 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>

  153. </div>

  154. 

  155. 

  156. 

  157. </body>

  158. </html>