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TableGen: Pattern<> references to null_frag are a nop.

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A standalone pattern defined in a multiclass expansion should handle
null_frag references just like patterns on instructions. Follow-up to
r160333.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160384 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2012-07-17 18:39:36 +00:00
parent 1cacae0f29
commit d3e31218ef
1 changed files with 5 additions and 0 deletions
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5
utils/TableGen/CodeGenDAGPatterns.cpp
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@ -2908,6 +2908,11 @@ void CodeGenDAGPatterns::ParsePatterns() {
for (unsigned i = 0, e = Patterns.size(); i != e; ++i) {
Record *CurPattern = Patterns[i];
DagInit *Tree = CurPattern->getValueAsDag("PatternToMatch");
// If the pattern references the null_frag, there's nothing to do.
if (hasNullFragReference(Tree))
continue;
TreePattern *Pattern = new TreePattern(CurPattern, Tree, true, *this);
// Inline pattern fragments into it.