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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"
using namespace llvm;
static void FormRecordChildNodes(OwningPtr<MatcherNode> &Matcher) {
static void ContractNodes(OwningPtr<MatcherNode> &Matcher) {
// If we reached the end of the chain, we're done.
MatcherNode *N = Matcher.get();
if (N == 0) return;
// If we have a push node, walk down both edges.
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 (RecordMatcherNode *RM = dyn_cast<RecordMatcherNode>(MC->getNext()))
if (MoveParentMatcherNode *MP =
dyn_cast<MoveParentMatcherNode>(RM->getNext())) {
MatcherNode *New
= new RecordChildMatcherNode(MC->getChildNo(), RM->getWhatFor());
New->setNext(MP->takeNext());
Matcher.reset(New);
return FormRecordChildNodes(Matcher);
}
if (RecordMatcherNode *RM = dyn_cast<RecordMatcherNode>(MC->getNext())) {
MatcherNode *New
= new RecordChildMatcherNode(MC->getChildNo(), RM->getWhatFor());
New->setNext(Matcher.take());
Matcher.reset(New);
MC->setNext(RM->takeNext());
return ContractNodes(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) {
OwningPtr<MatcherNode> MatcherPtr(Matcher);
FormRecordChildNodes(MatcherPtr);
ContractNodes(MatcherPtr);
return MatcherPtr.take();
}