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Remove Multidefs

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Multidefs are a bit unwieldy and incomplete.  Remove them in favor of
another mechanism, probably for loops.

Revert "Make Test More Thorough"
Revert "Fix a typo."
Revert "Vim Support for Multidefs"
Revert "Emacs Support for Multidefs"
Revert "Document Multidefs"
Revert "Add a Multidef Test"
Revert "Update Test for Multidefs"
Revert "Process Multidefs"
Revert "Parser Multidef Support"
Revert "Lexer Support for Multidefs"
Revert "Add Multidef Data Structures"

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141378 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Greene
2011-10-07 18:25:05 +00:00
parent 67370ef903
commit a1b1b79be1
10 changed files with 12 additions and 302 deletions
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59
docs/TableGenFundamentals.html
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@@ -769,65 +769,6 @@ before them.
</pre>
</div>
<p>
A special "multidef" may be used inside a multiclass to generate
several defs given a list of values.
</p>
<div class="doc_code">
<pre>
<b>class</b> Base&lt;int i&gt; {
int value = i;
}
<b>multiclass</b> Multi&lt;list&lt;int&gt; values&gt; {
<b>def</b> ONE : Base&lt;values[0]&gt;;
<b>def</b> TWO : Base&lt;values[1]&gt;;
<b>multidef</b> COUNT&lt;values, int v, 2&gt; : Base&lt;v&gt;;
}
<b>defm</b> List : Multi&lt;[1, 2, 3, 4, 5, 6]&lt;;
...
<i>// Results</i>
<b>def</b> ListCOUNT {
int v = ?;
int value = v;
list<int> Multi::values = [1, 2, 3, 4, 5, 6];
}
<b>def</b> ListONE {
int value = 1;
}
<b>def</b> ListTWO {
int value = 2;
}
<b>def</b> MD2.ListCOUNT {
int value = 3;
}
<b>def</b> MD3.ListCOUNT {
int value = 4;
}
<b>def</b> MD4.ListCOUNT {
int value = 5;
}
<b>def</b> MD5.ListCOUNT {
int value = 6;
}
</pre>
</div>
<p>
A multidef takes three "arguments" in the &lt;&gt; notation after the multidef
name. The first is a list of items to process. The second is a declaration.
This declaration creates a temporary name used as an iterator. It picks up the
value of each processed list item as TableGen generates defs from the multidef.
This temporary may be named and passed into the multidef body as shown in the
example above. This provides a powerful way to generate defs with various
values from a single multidef. The final "argument" is an integer value
indicating where in the list to begin processing. In the above example we
chose to begin list processing with the third item (index 2).
</p>
</div>
</div>