From a40555826e1b970712a0a4e1704de71fb33136dd Mon Sep 17 00:00:00 2001 From: Benjamin Kramer Date: Sun, 20 May 2012 18:10:42 +0000 Subject: Emit memcmp directly from the StringMatcherEmitter. 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 --- llvm/lib/TableGen/StringMatcher.cpp | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'llvm/lib/TableGen/StringMatcher.cpp') diff --git a/llvm/lib/TableGen/StringMatcher.cpp b/llvm/lib/TableGen/StringMatcher.cpp index 0ce626d4b19..16681702d1d 100644 --- a/llvm/lib/TableGen/StringMatcher.cpp +++ b/llvm/lib/TableGen/StringMatcher.cpp @@ -87,11 +87,11 @@ EmitStringMatcherForChar(const std::vector &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"; } -- cgit v1.2.3