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memoize translations

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23419 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-09-24 00:50:51 +00:00
parent ea874f3306
commit 296dfe3b8a
1 changed files with 11 additions and 0 deletions
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11
utils/TableGen/DAGISelEmitter.cpp
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@ -1153,6 +1153,9 @@ void DAGISelEmitter::EmitCodeForPattern(PatternToMatch &Pattern,
unsigned TmpNo = 0;
unsigned Res = CodeGenPatternResult(Pattern.second, TmpNo, VariableMap, OS);
// Add the result to the map if it has multiple uses.
OS << " if (!N.Val->hasOneUse()) CodeGenMap[N] = Tmp" << Res << ";\n";
OS << " return Tmp" << Res << ";\n";
OS << " }\n P" << PatternNo << "Fail:\n";
}
@ -1199,6 +1202,10 @@ void DAGISelEmitter::EmitInstructionSelector(std::ostream &OS) {
<< " if (N.getOpcode() >= ISD::BUILTIN_OP_END &&\n"
<< " N.getOpcode() < PPCISD::FIRST_NUMBER)\n"
<< " return N; // Already selected.\n\n"
<< " if (!N.Val->hasOneUse()) {\n"
<< " std::map<SDOperand, SDOperand>::iterator CGMI = CodeGenMap.find(N);\n"
<< " if (CGMI != CodeGenMap.end()) return CGMI->second;\n"
<< " }\n"
<< " switch (N.getOpcode()) {\n"
<< " default: break;\n"
<< " case ISD::EntryToken: // These leaves remain the same.\n"
@ -1250,6 +1257,10 @@ void DAGISelEmitter::run(std::ostream &OS) {
<< "// *** instruction selector class. These functions are really "
<< "methods.\n\n";
OS << "// Instance var to keep track of multiply used nodes that have \n"
<< "// already been selected.\n"
<< "std::map<SDOperand, SDOperand> CodeGenMap;\n";
ParseNodeInfo();
ParseNodeTransforms(OS);
ParsePatternFragments(OS);