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Implement !if, analogous to $(if) in GNU make.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71815 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Greene
2009-05-14 23:26:46 +00:00
parent 11adeed8b3
commit 9bea7c85d7
7 changed files with 63 additions and 2 deletions
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docs/TableGenFundamentals.html
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@@ -417,6 +417,8 @@ class. This operation is analogous to $(foreach) in GNU make.</dd>
<dd>The 2nd-N elements of list 'a.'</dd>
<dt><tt>!null(a)</tt></dt>
<dd>An integer {0,1} indicating whether list 'a' is empty.</dd>
<dt><tt>!if(a,b,c)</tt></dt>
<dd>'b' if the result of integer operator 'a' is nonzero, 'c' otherwise.</dd>
</dl>
<p>Note that all of the values have rules specifying how they convert to values