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Emit memcmp directly from the StringMatcherEmitter.

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There should be no difference in the resulting binary, given a sufficiently
smart compiler. However we already had compiler timeouts on the generated
code in Intrinsics.gen, this hopefully makes the lives of slow buildbots a
little easier.

llvm-svn: 157161
This commit is contained in:
Benjamin Kramer 2012-05-20 18:10:42 +00:00
parent e42f976213
commit d8782377c7
1 changed files with 4 additions and 4 deletions
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8
lib/TableGen/StringMatcher.cpp
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@ -87,11 +87,11 @@ EmitStringMatcherForChar(const std::vector<const StringPair*> &Matches,
<< Matches[0]->first[CharNo] << "')\n";
OS << Indent << " break;\n";
} else {
// Do the comparison with if (Str.substr(1, 3) != "foo").
// Do the comparison with if memcmp(Str.data()+1, "foo", 3).
// FIXME: Need to escape general strings.
OS << Indent << "if (" << StrVariableName << ".substr(" << CharNo << ", "
<< NumChars << ") != \"";
OS << Matches[0]->first.substr(CharNo, NumChars) << "\")\n";
OS << Indent << "if (memcmp(" << StrVariableName << ".data()+" << CharNo
<< ", \"" << Matches[0]->first.substr(CharNo, NumChars) << "\", "
<< NumChars << "))\n";
OS << Indent << " break;\n";
}