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Clearify the usage and add some debug stuff

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70700 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2009-05-03 12:58:58 +00:00
parent 9e12339cb2
commit 43ed64a182
1 changed files with 49 additions and 1 deletions
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50
lib/Target/MSP430/MSP430ISelDAGToDAG.cpp
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@ -57,6 +57,10 @@ namespace {
private:
SDNode *Select(SDValue Op);
#ifndef NDEBUG
unsigned Indent;
#endif
};
} // end anonymous namespace
@ -79,5 +83,49 @@ void MSP430DAGToDAGISel::InstructionSelect() {
}
SDNode *MSP430DAGToDAGISel::Select(SDValue Op) {
return SelectCode(Op);
SDNode *Node = Op.getNode();
// Dump information about the Node being selected
#ifndef NDEBUG
DOUT << std::string(Indent, ' ') << "Selecting: ";
DEBUG(Node->dump(CurDAG));
DOUT << "\n";
Indent += 2;
#endif
// If we have a custom node, we already have selected!
if (Node->isMachineOpcode()) {
#ifndef NDEBUG
DOUT << std::string(Indent-2, ' ') << "== ";
DEBUG(Node->dump(CurDAG));
DOUT << "\n";
Indent -= 2;
#endif
return NULL;
}
// Instruction Selection not handled by the auto-generated tablegen selection
// should be handled here.
// Something like this:
// unsigned Opcode = Node->getOpcode();
// switch (Opcode) {
// default: break;
// case ISD::Foo:
// return SelectFoo(Node)
// }
// Select the default instruction
SDNode *ResNode = SelectCode(Op);
#ifndef NDEBUG
DOUT << std::string(Indent-2, ' ') << "=> ";
if (ResNode == NULL || ResNode == Op.getNode())
DEBUG(Op.getNode()->dump(CurDAG));
else
DEBUG(ResNode->dump(CurDAG));
DOUT << "\n";
Indent -= 2;
#endif
return ResNode;
}