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R600/SI: Handle nodes with glue results correctly SITargetLowering::foldOperands()

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llvm-svn: 183133
This commit is contained in:
Tom Stellard 2013-06-03 17:39:50 +00:00
parent d58c6099f1
commit 45c3f3e363
1 changed files with 16 additions and 0 deletions
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16
lib/Target/R600/SIISelLowering.cpp
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@ -700,6 +700,22 @@ SDNode *SITargetLowering::foldOperands(MachineSDNode *Node,
for (unsigned i = NumOps - NumDefs, e = Node->getNumOperands(); i < e; ++i)
Ops.push_back(Node->getOperand(i));
// Nodes that have a glue result are not CSE'd by getMachineNode(), so in
// this case a brand new node is always be created, even if the operands
// are the same as before. So, manually check if anything has been changed.
if (Desc->Opcode == Opcode) {
bool Changed = false;
for (unsigned i = 0, e = Node->getNumOperands(); i < e; ++i) {
if (Ops[i].getNode() != Node->getOperand(i).getNode()) {
Changed = true;
break;
}
}
if (!Changed) {
return Node;
}
}
// Create a complete new instruction
return DAG.getMachineNode(Desc->Opcode, SDLoc(Node), Node->getVTList(), Ops);
}