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93 lines
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<title>MSP430-Ext - Using as</title>
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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<p>
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<a name="MSP430_002dExt"></a>Previous: <a rel="previous" accesskey="p" href="MSP430_002dRegs.html#MSP430_002dRegs">MSP430-Regs</a>,
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Up: <a rel="up" accesskey="u" href="MSP430-Syntax.html#MSP430-Syntax">MSP430 Syntax</a>
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<hr><br>
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</div>
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<h5 class="subsubsection">9.24.2.4 Assembler Extensions</h5>
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<p><a name="index-MSP430-Assembler-Extensions-1331"></a>
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<dl>
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<dt><code>@rN</code><dd>As destination operand being treated as <span class="samp">0(rn)</span>
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<br><dt><code>0(rN)</code><dd>As source operand being treated as <span class="samp">@rn</span>
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<br><dt><code>jCOND +N</code><dd>Skips next N bytes followed by jump instruction and equivalent to
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<span class="samp">jCOND $+N+2</span>
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</dl>
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<p>Also, there are some instructions, which cannot be found in other assemblers.
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These are branch instructions, which has different opcodes upon jump distance.
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They all got PC relative addressing mode.
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<dl>
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<dt><code>beq label</code><dd>A polymorph instruction which is <span class="samp">jeq label</span> in case if jump distance
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within allowed range for cpu's jump instruction. If not, this unrolls into
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a sequence of
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<pre class="smallexample"> jne $+6
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br label
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</pre>
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<br><dt><code>bne label</code><dd>A polymorph instruction which is <span class="samp">jne label</span> or <span class="samp">jeq +4; br label</span>
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<br><dt><code>blt label</code><dd>A polymorph instruction which is <span class="samp">jl label</span> or <span class="samp">jge +4; br label</span>
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<br><dt><code>bltn label</code><dd>A polymorph instruction which is <span class="samp">jn label</span> or <span class="samp">jn +2; jmp +4; br label</span>
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<br><dt><code>bltu label</code><dd>A polymorph instruction which is <span class="samp">jlo label</span> or <span class="samp">jhs +2; br label</span>
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<br><dt><code>bge label</code><dd>A polymorph instruction which is <span class="samp">jge label</span> or <span class="samp">jl +4; br label</span>
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<br><dt><code>bgeu label</code><dd>A polymorph instruction which is <span class="samp">jhs label</span> or <span class="samp">jlo +4; br label</span>
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<br><dt><code>bgt label</code><dd>A polymorph instruction which is <span class="samp">jeq +2; jge label</span> or <span class="samp">jeq +6; jl +4; br label</span>
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<br><dt><code>bgtu label</code><dd>A polymorph instruction which is <span class="samp">jeq +2; jhs label</span> or <span class="samp">jeq +6; jlo +4; br label</span>
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<br><dt><code>bleu label</code><dd>A polymorph instruction which is <span class="samp">jeq label; jlo label</span> or <span class="samp">jeq +2; jhs +4; br label</span>
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<br><dt><code>ble label</code><dd>A polymorph instruction which is <span class="samp">jeq label; jl label</span> or <span class="samp">jeq +2; jge +4; br label</span>
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<br><dt><code>jump label</code><dd>A polymorph instruction which is <span class="samp">jmp label</span> or <span class="samp">br label</span>
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</dl>
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