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add some noop code to push it out of my tree.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97094 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-02-25 01:57:41 +00:00
parent 60df53e30a
commit 06158406c5
1 changed files with 23 additions and 0 deletions
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23
utils/TableGen/DAGISelMatcherOpt.cpp
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@ -53,8 +53,31 @@ static void ContractNodes(OwningPtr<MatcherNode> &MatcherPtr) {
ContractNodes(N->getNextPtr());
}
static void FactorNodes(OwningPtr<MatcherNode> &MatcherPtr) {
// If we reached the end of the chain, we're done.
MatcherNode *N = MatcherPtr.get();
if (N == 0) return;
// If this is not a push node, just scan for one.
if (!isa<ScopeMatcherNode>(N))
return FactorNodes(N->getNextPtr());
// Okay, pull together the series of linear push nodes into a vector so we can
// inspect it more easily.
SmallVector<MatcherNode*, 32> OptionsToMatch;
MatcherNode *CurNode = N;
for (; ScopeMatcherNode *PMN = dyn_cast<ScopeMatcherNode>(CurNode);
CurNode = PMN->getNext())
OptionsToMatch.push_back(PMN->getCheck());
OptionsToMatch.push_back(CurNode);
}
MatcherNode *llvm::OptimizeMatcher(MatcherNode *Matcher) {
OwningPtr<MatcherNode> MatcherPtr(Matcher);
ContractNodes(MatcherPtr);
FactorNodes(MatcherPtr);
return MatcherPtr.take();
}