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teach tblgen to be more aggressive when factoring CheckType nodes.

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Now it will factor things like this:

CheckType i32
  ...
CheckOpcode ISD::AND
  CheckType i64
  ...

into:

SwitchType:
  i32: ...
  i64:
    CheckOpcode ISD::AND
    ...

This shrinks hte table by a few bytes, nothing spectacular.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97908 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-03-07 07:01:28 +00:00
parent f7399bf929
commit 9cdd9659c3
1 changed files with 95 additions and 29 deletions
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124
utils/TableGen/DAGISelMatcherOpt.cpp
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@ -220,6 +220,17 @@ static void SinkPatternPredicates(OwningPtr<Matcher> &MatcherPtr) {
N->setNext(CPPM);
}
/// FindCheckType - Scan a series of matchers looking for a CheckType that can
/// be pulled up to the start of the matcher. Return null if we didn't find one
/// otherwise return the matcher.
static CheckTypeMatcher *FindCheckType(Matcher *M) {
for (; M; M = M->getNext())
if (CheckTypeMatcher *CTM = dyn_cast<CheckTypeMatcher>(M))
return CTM;
return 0;
}
/// FactorNodes - Turn matches like this:
/// Scope
/// OPC_CheckType i32
@ -287,19 +298,42 @@ static void FactorNodes(OwningPtr<Matcher> &MatcherPtr) {
// we can merge anything else into this matching group.
unsigned Scan = OptionIdx;
while (1) {
while (Scan != e && Optn->isContradictory(OptionsToMatch[Scan]))
++Scan;
// If we ran out of stuff to scan, we're done.
if (Scan == e) break;
// Ok, we found something that isn't known to be contradictory. If it is
// equal, we can merge it into the set of nodes to factor, if not, we have
// to cease factoring.
if (Scan == e || !Optn->isEqual(OptionsToMatch[Scan])) break;
// If we found an entry that matches out matcher, merge it into the set to
// handle.
if (Optn->isEqual(OptionsToMatch[Scan])) {
// If is equal after all, add the option to EqualMatchers and remove it
// from OptionsToMatch.
EqualMatchers.push_back(OptionsToMatch[Scan]);
OptionsToMatch.erase(OptionsToMatch.begin()+Scan);
--e;
continue;
}
// If the option we're checking for contradicts the start of the list,
// skip over it.
if (Optn->isContradictory(OptionsToMatch[Scan])) {
++Scan;
continue;
}
// If is equal after all, add the option to EqualMatchers and remove it
// from OptionsToMatch.
EqualMatchers.push_back(OptionsToMatch[Scan]);
OptionsToMatch.erase(OptionsToMatch.begin()+Scan);
--e;
// If we're scannig for a type comparison and the type comparison got
// moved late, see if we can pull it up.
if (isa<CheckTypeMatcher>(Optn)) {
CheckTypeMatcher *CTM = FindCheckType(OptionsToMatch[Scan]);
if (CTM != 0 && CTM != OptionsToMatch[Scan] &&
CTM->canMoveBefore(OptionsToMatch[Scan])) {
Matcher *MatcherWithoutCTM = OptionsToMatch[Scan]->unlinkNode(CTM);
CTM->setNext(MatcherWithoutCTM);
OptionsToMatch[Scan] = CTM;
continue;
}
}
// Otherwise, we don't know how to handle this entry, we have to bail.
break;
}
if (Scan != e &&
@ -363,9 +397,11 @@ static void FactorNodes(OwningPtr<Matcher> &MatcherPtr) {
// we can convert this Scope to be a OpcodeSwitch instead.
bool AllOpcodeChecks = true, AllTypeChecks = true;
for (unsigned i = 0, e = NewOptionsToMatch.size(); i != e; ++i) {
if (!isa<CheckOpcodeMatcher>(NewOptionsToMatch[i])) {
// Check to see if this breaks a series of CheckOpcodeMatchers.
if (AllOpcodeChecks &&
!isa<CheckOpcodeMatcher>(NewOptionsToMatch[i])) {
#if 0
if (i > 3 && AllOpcodeChecks) {
if (i > 3) {
errs() << "FAILING OPC #" << i << "\n";
NewOptionsToMatch[i]->dump();
}
@ -373,20 +409,26 @@ static void FactorNodes(OwningPtr<Matcher> &MatcherPtr) {
AllOpcodeChecks = false;
}
if (!isa<CheckTypeMatcher>(NewOptionsToMatch[i]) ||
// iPTR checks could alias any other case without us knowing, don't
// bother with them.
cast<CheckTypeMatcher>(NewOptionsToMatch[i])->getType() == MVT::iPTR) {
// Check to see if this breaks a series of CheckTypeMatcher's.
if (AllTypeChecks) {
CheckTypeMatcher *CTM = FindCheckType(NewOptionsToMatch[i]);
if (CTM == 0 ||
// iPTR checks could alias any other case without us knowing, don't
// bother with them.
CTM->getType() == MVT::iPTR ||
// If the CheckType isn't at the start of the list, see if we can move
// it there.
!CTM->canMoveBefore(NewOptionsToMatch[i])) {
#if 0
if (i > 3 && AllTypeChecks) {
errs() << "FAILING TYPE #" << i << "\n";
NewOptionsToMatch[i]->dump();
}
if (i > 3 && AllTypeChecks) {
errs() << "FAILING TYPE #" << i << "\n";
NewOptionsToMatch[i]->dump();
}
#endif
AllTypeChecks = false;
AllTypeChecks = false;
}
}
}
// TODO: Can also do CheckChildNType.
// If all the options are CheckOpcode's, we can form the SwitchOpcode, woot.
if (AllOpcodeChecks) {
@ -405,16 +447,40 @@ static void FactorNodes(OwningPtr<Matcher> &MatcherPtr) {
// If all the options are CheckType's, we can form the SwitchType, woot.
if (AllTypeChecks) {
DenseSet<unsigned> Types;
DenseMap<unsigned, unsigned> TypeEntry;
SmallVector<std::pair<MVT::SimpleValueType, Matcher*>, 8> Cases;
for (unsigned i = 0, e = NewOptionsToMatch.size(); i != e; ++i) {
CheckTypeMatcher *CTM = cast<CheckTypeMatcher>(NewOptionsToMatch[i]);
assert(Types.insert(CTM->getType()).second &&
"Duplicate types not factored?");
Cases.push_back(std::make_pair(CTM->getType(), CTM->getNext()));
CheckTypeMatcher *CTM = FindCheckType(NewOptionsToMatch[i]);
Matcher *MatcherWithoutCTM = NewOptionsToMatch[i]->unlinkNode(CTM);
MVT::SimpleValueType CTMTy = CTM->getType();
delete CTM;
unsigned &Entry = TypeEntry[CTMTy];
if (Entry != 0) {
// If we have unfactored duplicate types, then we should factor them.
Matcher *PrevMatcher = Cases[Entry-1].second;
if (ScopeMatcher *SM = dyn_cast<ScopeMatcher>(PrevMatcher)) {
SM->setNumChildren(SM->getNumChildren()+1);
SM->resetChild(SM->getNumChildren()-1, MatcherWithoutCTM);
continue;
}
Matcher *Entries[2] = { PrevMatcher, MatcherWithoutCTM };
Cases[Entry-1].second = new ScopeMatcher(Entries, 2);
continue;
}
Entry = Cases.size()+1;
Cases.push_back(std::make_pair(CTMTy, MatcherWithoutCTM));
}
MatcherPtr.reset(new SwitchTypeMatcher(&Cases[0], Cases.size()));
if (Cases.size() != 1) {
MatcherPtr.reset(new SwitchTypeMatcher(&Cases[0], Cases.size()));
} else {
// If we factored and ended up with one case, create it now.
MatcherPtr.reset(new CheckTypeMatcher(Cases[0].first));
MatcherPtr->setNext(Cases[0].second);
}
return;
}