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change the scope node to include a list of children to be checked

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instead of to have a chained series of scope nodes.  This makes
the generated table smaller, improves the efficiency of the
interpreter, and make the factoring optimization much more 
reasonable to implement.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97160 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-02-25 19:00:39 +00:00
parent 2333655ed0
commit d6c84720df
7 changed files with 180 additions and 136 deletions
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96
include/llvm/CodeGen/DAGISelHeader.h
View File

@ -219,7 +219,7 @@ GetVBR(unsigned Val, const unsigned char *MatcherTable, unsigned &Idx) {
enum BuiltinOpcodes {
OPC_Scope, OPC_Scope2,
OPC_Scope,
OPC_RecordNode,
OPC_RecordChild0, OPC_RecordChild1, OPC_RecordChild2, OPC_RecordChild3,
OPC_RecordChild4, OPC_RecordChild5, OPC_RecordChild6, OPC_RecordChild7,
@ -374,20 +374,13 @@ SDNode *SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
switch (Opcode) {
case OPC_Scope: {
unsigned NumToSkip = MatcherTable[MatcherIndex++];
MatchScope NewEntry;
NewEntry.FailIndex = MatcherIndex+NumToSkip;
NewEntry.NodeStackSize = NodeStack.size();
NewEntry.NumRecordedNodes = RecordedNodes.size();
NewEntry.NumMatchedMemRefs = MatchedMemRefs.size();
NewEntry.InputChain = InputChain;
NewEntry.InputFlag = InputFlag;
NewEntry.HasChainNodesMatched = !ChainNodesMatched.empty();
NewEntry.HasFlagResultNodesMatched = !FlagResultNodesMatched.empty();
MatchScopes.push_back(NewEntry);
continue;
}
case OPC_Scope2: {
unsigned NumToSkip = GetInt2(MatcherTable, MatcherIndex);
if (NumToSkip & 128)
NumToSkip = GetVBR(NumToSkip, MatcherTable, MatcherIndex);
assert(NumToSkip != 0 &&
"First entry of OPC_Scope shouldn't be 0, scope has no children?");
// Push a MatchScope which indicates where to go if the first child fails
// to match.
MatchScope NewEntry;
NewEntry.FailIndex = MatcherIndex+NumToSkip;
NewEntry.NodeStackSize = NodeStack.size();
@ -929,33 +922,54 @@ SDNode *SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
}
}
// If the code reached this point, then the match failed pop out to the next
// match scope.
if (MatchScopes.empty()) {
CannotYetSelect(NodeToMatch);
return 0;
// If the code reached this point, then the match failed. See if there is
// another child to try in the current 'Scope', otherwise pop it until we
// find a case to check.
while (1) {
if (MatchScopes.empty()) {
CannotYetSelect(NodeToMatch);
return 0;
}
// Restore the interpreter state back to the point where the scope was
// formed.
MatchScope &LastScope = MatchScopes.back();
RecordedNodes.resize(LastScope.NumRecordedNodes);
NodeStack.resize(LastScope.NodeStackSize);
N = NodeStack.back();
DEBUG(errs() << " Match failed at index " << MatcherIndex
<< " continuing at " << LastScope.FailIndex << "\n");
if (LastScope.NumMatchedMemRefs != MatchedMemRefs.size())
MatchedMemRefs.resize(LastScope.NumMatchedMemRefs);
MatcherIndex = LastScope.FailIndex;
InputChain = LastScope.InputChain;
InputFlag = LastScope.InputFlag;
if (!LastScope.HasChainNodesMatched)
ChainNodesMatched.clear();
if (!LastScope.HasFlagResultNodesMatched)
FlagResultNodesMatched.clear();
// Check to see what the offset is at the new MatcherIndex. If it is zero
// we have reached the end of this scope, otherwise we have another child
// in the current scope to try.
unsigned NumToSkip = MatcherTable[MatcherIndex++];
if (NumToSkip & 128)
NumToSkip = GetVBR(NumToSkip, MatcherTable, MatcherIndex);
// If we have another child in this scope to match, update FailIndex and
// try it.
if (NumToSkip != 0) {
LastScope.FailIndex = MatcherIndex+NumToSkip;
break;
}
// End of this scope, pop it and try the next child in the containing
// scope.
MatchScopes.pop_back();
}
const MatchScope &LastScope = MatchScopes.back();
RecordedNodes.resize(LastScope.NumRecordedNodes);
NodeStack.resize(LastScope.NodeStackSize);
N = NodeStack.back();
DEBUG(errs() << " Match failed at index " << MatcherIndex
<< " continuing at " << LastScope.FailIndex << "\n");
if (LastScope.NumMatchedMemRefs != MatchedMemRefs.size())
MatchedMemRefs.resize(LastScope.NumMatchedMemRefs);
MatcherIndex = LastScope.FailIndex;
InputChain = LastScope.InputChain;
InputFlag = LastScope.InputFlag;
if (!LastScope.HasChainNodesMatched)
ChainNodesMatched.clear();
if (!LastScope.HasFlagResultNodesMatched)
FlagResultNodesMatched.clear();
MatchScopes.pop_back();
}
}

2
test/CodeGen/X86/2006-10-07-ScalarSSEMiscompile.ll
View File

@ -5,7 +5,7 @@
target datalayout = "e-p:32:32"
target triple = "i686-apple-darwin8.7.2"
define <4 x float> @test(<4 x float> %A, <4 x float>* %B) {
define <4 x float> @test(<4 x float> %A, <4 x float>* %B) nounwind {
%BV = load <4 x float>* %B ; <<4 x float>> [#uses=1]
%tmp28 = tail call <4 x float> @llvm.x86.sse.sub.ss( <4 x float> %A, <4 x float> %BV ) ; <<4 x float>> [#uses=1]
ret <4 x float> %tmp28

23
utils/TableGen/DAGISelEmitter.cpp
View File

@ -1945,8 +1945,6 @@ void DAGISelEmitter::run(raw_ostream &OS) {
}
#ifdef ENABLE_NEW_ISEL
Matcher *TheMatcher = 0;
// Add all the patterns to a temporary list so we can sort them.
std::vector<const PatternToMatch*> Patterns;
for (CodeGenDAGPatterns::ptm_iterator I = CGP.ptm_begin(), E = CGP.ptm_end();
@ -1960,20 +1958,13 @@ void DAGISelEmitter::run(raw_ostream &OS) {
PatternSortingPredicate2(CGP));
// Walk the patterns backwards (since we append to the front of the generated
// code), building a matcher for each and adding it to the matcher for the
// whole target.
while (!Patterns.empty()) {
const PatternToMatch &Pattern = *Patterns.back();
Patterns.pop_back();
Matcher *N = ConvertPatternToMatcher(Pattern, CGP);
if (TheMatcher == 0)
TheMatcher = N;
else
TheMatcher = new ScopeMatcher(N, TheMatcher);
}
// Convert each pattern into Matcher's.
std::vector<Matcher*> PatternMatchers;
for (unsigned i = 0, e = Patterns.size(); i != e; ++i)
PatternMatchers.push_back(ConvertPatternToMatcher(*Patterns[i], CGP));
Matcher *TheMatcher = new ScopeMatcher(&PatternMatchers[0],
PatternMatchers.size());
TheMatcher = OptimizeMatcher(TheMatcher);
//Matcher->dump();

11
utils/TableGen/DAGISelMatcher.cpp
View File

@ -25,9 +25,18 @@ void Matcher::print(raw_ostream &OS, unsigned indent) const {
return Next->print(OS, indent);
}
ScopeMatcher::~ScopeMatcher() {
for (unsigned i = 0, e = Children.size(); i != e; ++i)
delete Children[i];
}
// printImpl methods.
void ScopeMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
OS.indent(indent) << "Scope\n";
Check->print(OS, indent+2);
for (unsigned i = 0, e = getNumChildren(); i != e; ++i)
getChild(i)->print(OS, indent+2);
}
void RecordMatcher::printImpl(raw_ostream &OS, unsigned indent) const {

35
utils/TableGen/DAGISelMatcher.h
View File

@ -111,21 +111,32 @@ protected:
virtual unsigned getHashImpl() const = 0;
};
/// ScopeMatcher - This pushes a failure scope on the stack and evaluates
/// 'Check'. If 'Check' fails to match, it pops its scope and continues on to
/// 'Next'.
/// ScopeMatcher - This attempts to match each of its children to find the first
/// one that successfully matches. If one child fails, it tries the next child.
/// If none of the children match then this check fails. It never has a 'next'.
class ScopeMatcher : public Matcher {
OwningPtr<Matcher> Check;
SmallVector<Matcher*, 4> Children;
public:
ScopeMatcher(Matcher *check = 0, Matcher *next = 0)
: Matcher(Scope), Check(check) {
setNext(next);
ScopeMatcher(Matcher *const *children, unsigned numchildren)
: Matcher(Scope), Children(children, children+numchildren) {
}
virtual ~ScopeMatcher();
Matcher *getCheck() { return Check.get(); }
const Matcher *getCheck() const { return Check.get(); }
void setCheck(Matcher *N) { Check.reset(N); }
OwningPtr<Matcher> &getCheckPtr() { return Check; }
unsigned getNumChildren() const { return Children.size(); }
Matcher *getChild(unsigned i) { return Children[i]; }
const Matcher *getChild(unsigned i) const { return Children[i]; }
void resetChild(unsigned i, Matcher *N) {
delete Children[i];
Children[i] = N;
}
Matcher *takeChild(unsigned i) {
Matcher *Res = Children[i];
Children[i] = 0;
return Res;
}
static inline bool classof(const Matcher *N) {
return N->getKind() == Scope;
@ -134,7 +145,7 @@ public:
private:
virtual void printImpl(raw_ostream &OS, unsigned indent) const;
virtual bool isEqualImpl(const Matcher *M) const { return false; }
virtual unsigned getHashImpl() const { return 0; }
virtual unsigned getHashImpl() const { return 12312; }
};
/// RecordMatcher - Save the current node in the operand list.

110
utils/TableGen/DAGISelMatcherEmitter.cpp
View File

@ -88,7 +88,7 @@ public:
void EmitHistogram(formatted_raw_ostream &OS);
private:
unsigned EmitMatcher(const Matcher *N, unsigned Indent,
unsigned EmitMatcher(const Matcher *N, unsigned Indent, unsigned CurrentIdx,
formatted_raw_ostream &OS);
unsigned getNodePredicate(StringRef PredName) {
@ -129,6 +129,17 @@ private:
};
} // end anonymous namespace.
static unsigned GetVBRSize(unsigned Val) {
if (Val <= 127) return 1;
unsigned NumBytes = 0;
while (Val >= 128) {
Val >>= 7;
++NumBytes;
}
return NumBytes+1;
}
/// EmitVBRValue - Emit the specified value as a VBR, returning the number of
/// bytes emitted.
static unsigned EmitVBRValue(unsigned Val, raw_ostream &OS) {
@ -151,11 +162,58 @@ static unsigned EmitVBRValue(unsigned Val, raw_ostream &OS) {
/// EmitMatcherOpcodes - Emit bytes for the specified matcher and return
/// the number of bytes emitted.
unsigned MatcherTableEmitter::
EmitMatcher(const Matcher *N, unsigned Indent, formatted_raw_ostream &OS) {
EmitMatcher(const Matcher *N, unsigned Indent, unsigned CurrentIdx,
formatted_raw_ostream &OS) {
OS.PadToColumn(Indent*2);
switch (N->getKind()) {
case Matcher::Scope: assert(0 && "Should be handled by caller");
case Matcher::Scope: {
const ScopeMatcher *SM = cast<ScopeMatcher>(N);
assert(SM->getNext() == 0 && "Shouldn't have next after scope");
unsigned StartIdx = CurrentIdx;
// Emit all of the children.
for (unsigned i = 0, e = SM->getNumChildren(); i != e; ++i) {
if (i == 0) {
OS << "OPC_Scope, ";
++CurrentIdx;
} else {
OS << "/*" << CurrentIdx << "*/";
OS.PadToColumn(Indent*2) << "/*Scope*/ ";
}
// We need to encode the child and the offset of the failure code before
// emitting either of them. Handle this by buffering the output into a
// string while we get the size. Unfortunately, the offset of the
// children depends on the VBR size of the child, so for large children we
// have to iterate a bit.
SmallString<128> TmpBuf;
unsigned ChildSize = 0;
unsigned VBRSize = 0;
do {
VBRSize = GetVBRSize(ChildSize);
TmpBuf.clear();
raw_svector_ostream OS(TmpBuf);
formatted_raw_ostream FOS(OS);
ChildSize = EmitMatcherList(cast<ScopeMatcher>(N)->getChild(i),
Indent+1, CurrentIdx+VBRSize, FOS);
} while (GetVBRSize(ChildSize) != VBRSize);
assert(ChildSize != 0 && "Should not have a zero-sized child!");
CurrentIdx += EmitVBRValue(ChildSize, OS);
OS << '\n' << TmpBuf.str();
CurrentIdx += ChildSize;
}
// Emit a zero as a sentinel indicating end of 'Scope'.
OS << "/*" << CurrentIdx << "*/";
OS.PadToColumn(Indent*2) << "0, /*End of Scope*/\n";
return CurrentIdx - StartIdx + 1;
}
case Matcher::RecordNode:
OS << "OPC_RecordNode,";
OS.PadToColumn(CommentIndent) << "// "
@ -387,52 +445,8 @@ EmitMatcherList(const Matcher *N, unsigned Indent, unsigned CurrentIdx,
Histogram.resize(N->getKind()+1);
Histogram[N->getKind()]++;
// Scope is a special case since it is binary.
if (const ScopeMatcher *SMN = dyn_cast<ScopeMatcher>(N)) {
// We need to encode the child and the offset of the failure code before
// emitting either of them. Handle this by buffering the output into a
// string while we get the size.
SmallString<128> TmpBuf;
unsigned NextSize;
{
raw_svector_ostream OS(TmpBuf);
formatted_raw_ostream FOS(OS);
NextSize = EmitMatcherList(cast<ScopeMatcher>(N)->getCheck(),
Indent+1, CurrentIdx+2, FOS);
}
// In the unlikely event that we have something too big to emit with a
// one byte offset, regenerate it with a two-byte one.
if (NextSize > 255) {
TmpBuf.clear();
raw_svector_ostream OS(TmpBuf);
formatted_raw_ostream FOS(OS);
NextSize = EmitMatcherList(cast<ScopeMatcher>(N)->getCheck(),
Indent+1, CurrentIdx+3, FOS);
if (NextSize > 65535) {
errs() <<
"Tblgen internal error: can't handle pattern this complex yet\n";
exit(1);
}
}
OS << "/*" << CurrentIdx << "*/";
OS.PadToColumn(Indent*2);
if (NextSize < 256)
OS << "OPC_Scope, " << NextSize << ",\n";
else
OS << "OPC_Scope2, " << (NextSize&255) << ", " << (NextSize>>8) <<",\n";
OS << TmpBuf.str();
Size += 2+NextSize;
CurrentIdx += 2+NextSize;
N = SMN->getNext();
continue;
}
OS << "/*" << CurrentIdx << "*/";
unsigned MatcherSize = EmitMatcher(N, Indent, OS);
unsigned MatcherSize = EmitMatcher(N, Indent, CurrentIdx, OS);
Size += MatcherSize;
CurrentIdx += MatcherSize;

39
utils/TableGen/DAGISelMatcherOpt.cpp
View File

@ -21,9 +21,15 @@ static void ContractNodes(OwningPtr<Matcher> &MatcherPtr) {
Matcher *N = MatcherPtr.get();
if (N == 0) return;
// If we have a scope node, walk down both edges.
if (ScopeMatcher *Push = dyn_cast<ScopeMatcher>(N))
ContractNodes(Push->getCheckPtr());
// If we have a scope node, walk down all of the children.
if (ScopeMatcher *Scope = dyn_cast<ScopeMatcher>(N)) {
for (unsigned i = 0, e = Scope->getNumChildren(); i != e; ++i) {
OwningPtr<Matcher> Child(Scope->takeChild(i));
ContractNodes(Child);
Scope->resetChild(i, Child.take());
}
return;
}
// If we found a movechild node with a node that comes in a 'foochild' form,
// transform it.
@ -61,32 +67,31 @@ static void FactorNodes(OwningPtr<Matcher> &MatcherPtr) {
if (N == 0) return;
// If this is not a push node, just scan for one.
if (!isa<ScopeMatcher>(N))
ScopeMatcher *Scope = dyn_cast<ScopeMatcher>(N);
if (Scope == 0)
return FactorNodes(N->getNextPtr());
// Okay, pull together the series of linear push nodes into a vector so we can
// Okay, pull together the children of the scope node into a vector so we can
// inspect it more easily. While we're at it, bucket them up by the hash
// code of their first predicate.
SmallVector<Matcher*, 32> OptionsToMatch;
typedef DenseMap<unsigned, std::vector<Matcher*> > HashTableTy;
HashTableTy MatchersByHash;
Matcher *CurNode = N;
for (; ScopeMatcher *PMN = dyn_cast<ScopeMatcher>(CurNode);
CurNode = PMN->getNext()) {
for (unsigned i = 0, e = Scope->getNumChildren(); i != e; ++i) {
// Factor the subexpression.
FactorNodes(PMN->getCheckPtr());
if (Matcher *Check = PMN->getCheck()) {
OptionsToMatch.push_back(Check);
MatchersByHash[Check->getHash()].push_back(Check);
OwningPtr<Matcher> Child(Scope->takeChild(i));
FactorNodes(Child);
// FIXME: Eventually don't pass ownership back to the scope node.
Scope->resetChild(i, Child.take());
if (Matcher *N = Scope->getChild(i)) {
OptionsToMatch.push_back(N);
MatchersByHash[N->getHash()].push_back(N);
}
}
if (CurNode) {
OptionsToMatch.push_back(CurNode);
MatchersByHash[CurNode->getHash()].push_back(CurNode);
}
SmallVector<Matcher*, 32> NewOptionsToMatch;