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Teach tablegen how to inherit from classes in 'defm' definitions.

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The rule is simple: only inherit from a class list if they come
in the end, after the last multiclass.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106305 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bruno Cardoso Lopes
2010-06-18 19:53:41 +00:00
parent 78db186d2d
commit 6e0a99a7ab
3 changed files with 127 additions and 0 deletions
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41
docs/TableGenFundamentals.html
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@@ -732,6 +732,47 @@ multiclass instanciations.
</pre>
</div>
<p>
defm declarations can inherit from classes too, the
rule to follow is that the class list must start after the
last multiclass, and there must be at least one multiclass
before them.
</p>
<div class="doc_code">
<pre>
<b>class</b> XD { bits&lt;4&gt; Prefix = 11; }
<b>class</b> XS { bits&lt;4&gt; Prefix = 12; }
<b>class</b> I&lt;bits<4&gt; op> {
bits&lt;4&gt; opcode = op;
}
<b>multiclass</b> R {
<b>def</b> rr : I&lt;4&gt;;
<b>def</b> rm : I&lt;2&gt;;
}
<b>multiclass</b> Y {
<b>defm</b> SS : R, XD;
<b>defm</b> SD : R, XS;
}
<b>defm</b> Instr : Y;
<i>// Results</i>
<b>def</b> InstrSDrm {
bits&lt;4&gt; opcode = { 0, 0, 1, 0 };
bits&lt;4&gt; Prefix = { 1, 1, 0, 0 };
}
...
<b>def</b> InstrSSrr {
bits&lt;4&gt; opcode = { 0, 1, 0, 0 };
bits&lt;4&gt; Prefix = { 1, 0, 1, 1 };
}
</pre>
</div>
</div>
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