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Slightly improve generated code in a degenerate case. 

Should remove a warning from MSVC.

llvm-svn: 71603
This commit is contained in:
Dale Johannesen 2009-05-12 22:32:29 +00:00
parent 46632d89bb
commit 69ee5e4cfe
1 changed files with 8 additions and 0 deletions
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8
llvm/utils/TableGen/DAGISelEmitter.cpp
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@ -2025,6 +2025,14 @@ void DAGISelEmitter::EmitInstructionSelector(std::ostream &OS) {
OpcodeVTMap.find(OpName);
std::vector<std::string> &OpVTs = OpVTI->second;
OS << " case " << OpName << ": {\n";
// If we have only one variant and it's the default, elide the
// switch. Marginally faster, and makes MSVC happier.
if (OpVTs.size()==1 && OpVTs[0].empty()) {
OS << " return Select_" << getLegalCName(OpName) << "(N);\n";
OS << " break;\n";
OS << " }\n";
continue;
}
// Keep track of whether we see a pattern that has an iPtr result.
bool HasPtrPattern = false;
bool HasDefaultPattern = false;