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Implement Function::getIntrinsicID without it needing to call Value::getName,

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which allocates a string.  This speeds up instcombine on 447.dealII by 5%.

llvm-svn: 34318
This commit is contained in:
Chris Lattner 2007-02-15 19:17:16 +00:00
parent 25a8dc8e25
commit 5d0b16f797
2 changed files with 10 additions and 5 deletions
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9
lib/VMCore/Function.cpp
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@ -160,12 +160,15 @@ void Function::dropAllReferences() {
/// llvm/Intrinsics.h.
///
unsigned Function::getIntrinsicID() const {
const std::string& Name = this->getName();
if (Name.size() < 5 || Name[4] != '.' || Name[0] != 'l' || Name[1] != 'l'
const ValueName *ValName = this->getValueName();
unsigned Len = ValName->getKeyLength();
const char *Name = ValName->getKeyData();
if (Len < 5 || Name[4] != '.' || Name[0] != 'l' || Name[1] != 'l'
|| Name[2] != 'v' || Name[3] != 'm')
return 0; // All intrinsics start with 'llvm.'
assert(Name.size() != 5 && "'llvm.' is an invalid intrinsic name!");
assert(Len != 5 && "'llvm.' is an invalid intrinsic name!");
#define GET_FUNCTION_RECOGNIZER
#include "llvm/Intrinsics.gen"

6
utils/TableGen/IntrinsicEmitter.cpp
View File

@ -81,17 +81,19 @@ EmitFnNameRecognizer(const std::vector<CodeGenIntrinsic> &Ints,
OS << "// Function name -> enum value recognizer code.\n";
OS << "#ifdef GET_FUNCTION_RECOGNIZER\n";
OS << " switch (Name[5]) {\n";
OS << " default: break;\n";
OS << " default:\n";
// Emit the intrinsics in sorted order.
char LastChar = 0;
for (std::map<std::string, std::string>::iterator I = IntMapping.begin(),
E = IntMapping.end(); I != E; ++I) {
if (I->first[5] != LastChar) {
LastChar = I->first[5];
OS << " break;\n";
OS << " case '" << LastChar << "':\n";
}
OS << " if (Name == \"" << I->first << "\") return Intrinsic::"
OS << " if (Len == " << I->first.size()
<< " && !strcmp(Name, \"" << I->first << "\")) return Intrinsic::"
<< I->second << ";\n";
}
OS << " }\n";