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slightly improve the runtime and code size of the Intrinsics info table by not 

comparing the "llvm." prefix in the memcmp, and not storing it in the string literal.

llvm-svn: 113136
This commit is contained in:
Chris Lattner 2010-09-06 01:44:44 +00:00
parent e34c835bde
commit fb43da66b5
1 changed files with 15 additions and 13 deletions
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28
llvm/utils/TableGen/IntrinsicEmitter.cpp
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@ -99,33 +99,35 @@ EmitFnNameRecognizer(const std::vector<CodeGenIntrinsic> &Ints,
// Build a function name -> intrinsic name mapping.
std::map<std::string, unsigned> IntMapping;
for (unsigned i = 0, e = Ints.size(); i != e; ++i)
IntMapping[Ints[i].Name] = i;
IntMapping[Ints[i].Name.substr(5)] = i;
OS << "// Function name -> enum value recognizer code.\n";
OS << "#ifdef GET_FUNCTION_RECOGNIZER\n";
OS << " switch (Name[5]) {\n";
OS << " Name += 5; Len -= 5; // Skip over 'llvm.'\n";
OS << " switch (*Name) { // Dispatch on first letter.\n";
OS << " default:\n";
// Emit the intrinsics in sorted order.
char LastChar = 0;
for (std::map<std::string, unsigned>::iterator I = IntMapping.begin(),
E = IntMapping.end(); I != E; ++I) {
if (I->first[5] != LastChar) {
LastChar = I->first[5];
if (I->first[0] != LastChar) {
LastChar = I->first[0];
OS << " break;\n";
OS << " case '" << LastChar << "':\n";
}
// For overloaded intrinsics, only the prefix needs to match
if (Ints[I->second].isOverloaded)
OS << " if (Len > " << I->first.size()
<< " && !memcmp(Name, \"" << I->first << ".\", "
<< (I->first.size() + 1) << ")) return " << TargetPrefix << "Intrinsic::"
std::string TheStr = I->first;
if (Ints[I->second].isOverloaded) {
TheStr += '.'; // Require "bswap." instead of bswap.
OS << " if (Len > " << I->first.size();
} else {
OS << " if (Len == " << I->first.size();
}
OS << " && !memcmp(Name, \"" << TheStr << "\", "
<< TheStr.size() << ")) return " << TargetPrefix << "Intrinsic::"
<< Ints[I->second].EnumName << ";\n";
else
OS << " if (Len == " << I->first.size()
<< " && !memcmp(Name, \"" << I->first << "\", "
<< I->first.size() << ")) return " << TargetPrefix << "Intrinsic::"
<< Ints[I->second].EnumName << ";\n";
}
OS << " }\n";
OS << "#endif\n\n";