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restore some 'magic' code that I removed: it is needed. Add comments explaining 

why.

llvm-svn: 31743
This commit is contained in:
Chris Lattner 2006-11-14 22:17:10 +00:00
parent c5dd5b11a4
commit c75081b7a8
1 changed files with 22 additions and 10 deletions
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32
llvm/utils/TableGen/DAGISelEmitter.cpp
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@ -3602,10 +3602,15 @@ void DAGISelEmitter::EmitInstructionSelector(std::ostream &OS) {
// Print function.
std::string OpVTStr;
if (OpVT == MVT::iPTR)
OpVTStr = "iPTR";
else
OpVTStr = getEnumName(OpVT).substr(5); // Skip 'MVT::'
if (OpVT == MVT::iPTR) {
OpVTStr = "_iPTR";
} else if (OpVT == MVT::isVoid) {
// Nodes with a void result actually have a first result type of either
// Other (a chain) or Flag. Since there is no one-to-one mapping from
// void to this case, we handle it specially here.
} else {
OpVTStr = "_" + getEnumName(OpVT).substr(5); // Skip 'MVT::'
}
std::map<std::string, std::vector<std::string> >::iterator OpVTI =
OpcodeVTMap.find(OpName);
if (OpVTI == OpcodeVTMap.end()) {
@ -3616,7 +3621,7 @@ void DAGISelEmitter::EmitInstructionSelector(std::ostream &OS) {
OpVTI->second.push_back(OpVTStr);
OS << "SDNode *Select_" << getLegalCName(OpName)
<< "_" << OpVTStr << "(const SDOperand &N) {\n";
<< OpVTStr << "(const SDOperand &N) {\n";
// Loop through and reverse all of the CodeList vectors, as we will be
// accessing them from their logical front, but accessing the end of a
@ -3723,25 +3728,29 @@ void DAGISelEmitter::EmitInstructionSelector(std::ostream &OS) {
if (OpVTs.size() == 1) {
std::string &VTStr = OpVTs[0];
OS << " return Select_" << getLegalCName(OpName)
<< (VTStr != "" ? "_" : "") << VTStr << "(N);\n";
<< VTStr << "(N);\n";
} else {
// Keep track of whether we see a pattern that has an iPtr result.
bool HasPtrPattern = false;
bool HasDefaultPattern = false;
OS << " switch (NVT) {\n";
for (unsigned i = 0, e = OpVTs.size(); i < e; ++i) {
std::string &VTStr = OpVTs[i];
assert(!VTStr.empty() && "Unset vtstr?");
if (VTStr.empty()) {
HasDefaultPattern = true;
continue;
}
// If this is a match on iPTR: don't emit it directly, we need special
// code.
if (VTStr == "iPTR") {
if (VTStr == "_iPTR") {
HasPtrPattern = true;
continue;
}
OS << " case MVT::" << VTStr << ":\n"
OS << " case MVT::" << VTStr.substr(1) << ":\n"
<< " return Select_" << getLegalCName(OpName)
<< "_" << VTStr << "(N);\n";
<< VTStr << "(N);\n";
}
OS << " default:\n";
@ -3750,6 +3759,9 @@ void DAGISelEmitter::EmitInstructionSelector(std::ostream &OS) {
OS << " if (NVT == TLI.getPointerTy())\n";
OS << " return Select_" << getLegalCName(OpName) <<"_iPTR(N);\n";
}
if (HasDefaultPattern) {
OS << " return Select_" << getLegalCName(OpName) << "(N);\n";
}
OS << " break;\n";
OS << " }\n";
OS << " break;\n";