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so hey, it turns out that the histogram was completely wrong, because

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we sometimes emit nodes multiple times to string buffers to size them.
Compute the histogram correctly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97708 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-03-04 01:34:29 +00:00
parent b3958e8032
commit 57fcd03611
1 changed files with 32 additions and 10 deletions
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42
utils/TableGen/DAGISelMatcherEmitter.cpp
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@ -42,8 +42,6 @@ class MatcherTableEmitter {
DenseMap<Record*, unsigned> NodeXFormMap;
std::vector<Record*> NodeXForms;
// Per opcode frequence count.
std::vector<unsigned> Histogram;
public:
MatcherTableEmitter() {}
@ -53,7 +51,7 @@ public:
void EmitPredicateFunctions(const CodeGenDAGPatterns &CGP,
formatted_raw_ostream &OS);
void EmitHistogram(formatted_raw_ostream &OS);
void EmitHistogram(const Matcher *N, formatted_raw_ostream &OS);
private:
unsigned EmitMatcher(const Matcher *N, unsigned Indent, unsigned CurrentIdx,
formatted_raw_ostream &OS);
@ -554,9 +552,6 @@ EmitMatcherList(const Matcher *N, unsigned Indent, unsigned CurrentIdx,
formatted_raw_ostream &OS) {
unsigned Size = 0;
while (N) {
if (unsigned(N->getKind()) >= Histogram.size())
Histogram.resize(N->getKind()+1);
Histogram[N->getKind()]++;
if (!OmitComments)
OS << "/*" << CurrentIdx << "*/";
unsigned MatcherSize = EmitMatcher(N, Indent, CurrentIdx, OS);
@ -681,11 +676,38 @@ void MatcherTableEmitter::EmitPredicateFunctions(const CodeGenDAGPatterns &CGP,
}
}
void MatcherTableEmitter::EmitHistogram(formatted_raw_ostream &OS) {
static void BuildHistogram(const Matcher *M, std::vector<unsigned> &OpcodeFreq){
for (; M != 0; M = M->getNext()) {
// Count this node.
if (unsigned(M->getKind()) >= OpcodeFreq.size())
OpcodeFreq.resize(M->getKind()+1);
OpcodeFreq[M->getKind()]++;
// Handle recursive nodes.
if (const ScopeMatcher *SM = dyn_cast<ScopeMatcher>(M)) {
for (unsigned i = 0, e = SM->getNumChildren(); i != e; ++i)
BuildHistogram(SM->getChild(i), OpcodeFreq);
} else if (const SwitchOpcodeMatcher *SOM =
dyn_cast<SwitchOpcodeMatcher>(M)) {
for (unsigned i = 0, e = SOM->getNumCases(); i != e; ++i)
BuildHistogram(SOM->getCaseMatcher(i), OpcodeFreq);
} else if (const SwitchTypeMatcher *STM = dyn_cast<SwitchTypeMatcher>(M)) {
for (unsigned i = 0, e = STM->getNumCases(); i != e; ++i)
BuildHistogram(STM->getCaseMatcher(i), OpcodeFreq);
}
}
}
void MatcherTableEmitter::EmitHistogram(const Matcher *M,
formatted_raw_ostream &OS) {
if (OmitComments)
return;
std::vector<unsigned> OpcodeFreq;
BuildHistogram(M, OpcodeFreq);
OS << " // Opcode Histogram:\n";
for (unsigned i = 0, e = Histogram.size(); i != e; ++i) {
for (unsigned i = 0, e = OpcodeFreq.size(); i != e; ++i) {
OS << " // #";
switch ((Matcher::KindTy)i) {
case Matcher::Scope: OS << "OPC_Scope"; break;
@ -725,7 +747,7 @@ void MatcherTableEmitter::EmitHistogram(formatted_raw_ostream &OS) {
case Matcher::CompleteMatch: OS << "OPC_CompleteMatch"; break;
}
OS.PadToColumn(40) << " = " << Histogram[i] << '\n';
OS.PadToColumn(40) << " = " << OpcodeFreq[i] << '\n';
}
OS << '\n';
}
@ -746,7 +768,7 @@ void llvm::EmitMatcherTable(const Matcher *TheMatcher,
unsigned TotalSize = MatcherEmitter.EmitMatcherList(TheMatcher, 5, 0, OS);
OS << " 0\n }; // Total Array size is " << (TotalSize+1) << " bytes\n\n";
MatcherEmitter.EmitHistogram(OS);
MatcherEmitter.EmitHistogram(TheMatcher, OS);
OS << " #undef TARGET_OPCODE\n";
OS << " return SelectCodeCommon(N, MatcherTable,sizeof(MatcherTable));\n}\n";