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split the movechild/record/moveparent -> recordchild optzn into a

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movechild/record -> recordchild/movechild and 
movechild/moveparent -> noop xforms.  This slightly shrinks the tables
(x86 to 117454) and enables adding future improvements.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97051 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-02-24 19:52:48 +00:00
parent e177c9a9bc
commit 22c48b384c
1 changed files with 22 additions and 16 deletions
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38
utils/TableGen/DAGISelMatcherOpt.cpp
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@ -14,35 +14,41 @@
#include "DAGISelMatcher.h" #include "DAGISelMatcher.h"
using namespace llvm; using namespace llvm;
static void ContractNodes(OwningPtr<MatcherNode> &Matcher) {
static void FormRecordChildNodes(OwningPtr<MatcherNode> &Matcher) {
// If we reached the end of the chain, we're done. // If we reached the end of the chain, we're done.
MatcherNode *N = Matcher.get(); MatcherNode *N = Matcher.get();
if (N == 0) return; if (N == 0) return;
// If we have a push node, walk down both edges. // If we have a push node, walk down both edges.
if (PushMatcherNode *Push = dyn_cast<PushMatcherNode>(N)) if (PushMatcherNode *Push = dyn_cast<PushMatcherNode>(N))
FormRecordChildNodes(Push->getFailurePtr()); ContractNodes(Push->getFailurePtr());
// If we found a movechild node, check to see if our pattern matches. // If we found a movechild node with a node that comes in a 'foochild' form,
// transform it.
if (MoveChildMatcherNode *MC = dyn_cast<MoveChildMatcherNode>(N)) { if (MoveChildMatcherNode *MC = dyn_cast<MoveChildMatcherNode>(N)) {
if (RecordMatcherNode *RM = dyn_cast<RecordMatcherNode>(MC->getNext())) if (RecordMatcherNode *RM = dyn_cast<RecordMatcherNode>(MC->getNext())) {
if (MoveParentMatcherNode *MP = MatcherNode *New
dyn_cast<MoveParentMatcherNode>(RM->getNext())) { = new RecordChildMatcherNode(MC->getChildNo(), RM->getWhatFor());
MatcherNode *New New->setNext(Matcher.take());
= new RecordChildMatcherNode(MC->getChildNo(), RM->getWhatFor()); Matcher.reset(New);
New->setNext(MP->takeNext()); MC->setNext(RM->takeNext());
Matcher.reset(New); return ContractNodes(Matcher);
return FormRecordChildNodes(Matcher); }
}
} }
FormRecordChildNodes(N->getNextPtr()); if (MoveChildMatcherNode *MC = dyn_cast<MoveChildMatcherNode>(N))
if (MoveParentMatcherNode *MP =
dyn_cast<MoveParentMatcherNode>(MC->getNext())) {
Matcher.reset(MP->takeNext());
return ContractNodes(Matcher);
}
ContractNodes(N->getNextPtr());
} }
MatcherNode *llvm::OptimizeMatcher(MatcherNode *Matcher) { MatcherNode *llvm::OptimizeMatcher(MatcherNode *Matcher) {
OwningPtr<MatcherNode> MatcherPtr(Matcher); OwningPtr<MatcherNode> MatcherPtr(Matcher);
FormRecordChildNodes(MatcherPtr); ContractNodes(MatcherPtr);
return MatcherPtr.take(); return MatcherPtr.take();
} }