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3.9 KiB
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77 lines
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<title>VAX-operands - Using as</title>
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Next: <a rel="next" accesskey="n" href="VAX_002dno.html#VAX_002dno">VAX-no</a>,
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<h4 class="subsection">9.50.6 VAX Operands</h4>
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<p><a name="index-VAX-operand-notation-2513"></a><a name="index-operand-notation_002c-VAX-2514"></a><a name="index-immediate-character_002c-VAX-2515"></a><a name="index-VAX-immediate-character-2516"></a>The immediate character is ‘<samp><span class="samp">$</span></samp>’ for Unix compatibility, not
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‘<samp><span class="samp">#</span></samp>’ as DEC writes it.
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<p><a name="index-indirect-character_002c-VAX-2517"></a><a name="index-VAX-indirect-character-2518"></a>The indirect character is ‘<samp><span class="samp">*</span></samp>’ for Unix compatibility, not
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‘<samp><span class="samp">@</span></samp>’ as DEC writes it.
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<p><a name="index-displacement-sizing-character_002c-VAX-2519"></a><a name="index-VAX-displacement-sizing-character-2520"></a>The displacement sizing character is ‘<samp><span class="samp">`</span></samp>’ (an accent grave) for
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Unix compatibility, not ‘<samp><span class="samp">^</span></samp>’ as DEC writes it. The letter
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preceding ‘<samp><span class="samp">`</span></samp>’ may have either case. ‘<samp><span class="samp">G</span></samp>’ is not
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understood, but all other letters (<code>b i l s w</code>) are understood.
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<p><a name="index-register-names_002c-VAX-2521"></a><a name="index-VAX-register-names-2522"></a>Register names understood are <code>r0 r1 r2 ... r15 ap fp sp
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pc</code>. Upper and lower case letters are equivalent.
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<p>For instance
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<pre class="smallexample"> tstb *w`$4(r5)
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</pre>
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<p>Any expression is permitted in an operand. Operands are comma
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separated.
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<!-- There is some bug to do with recognizing expressions -->
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<!-- in operands, but I forget what it is. It is -->
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<!-- a syntax clash because () is used as an address mode -->
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<!-- and to encapsulate sub-expressions. -->
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