diff options
| -rw-r--r-- | utils/TableGen/DAGISelEmitter.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/utils/TableGen/DAGISelEmitter.cpp b/utils/TableGen/DAGISelEmitter.cpp index 39791e2cba..0e2e61596f 100644 --- a/utils/TableGen/DAGISelEmitter.cpp +++ b/utils/TableGen/DAGISelEmitter.cpp @@ -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; |