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Delete the heuristic for non-livein CopyFromReg nodes. Non-liveinness
is determined by whether the node has a Flag operand. However, if the node does have a Flag operand, it will be glued to its register's def, so the heuristic would end up spuriously applying to whatever node is the def. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64319 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -899,12 +899,6 @@ namespace {
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};
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} // end anonymous namespace
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static inline bool isCopyFromLiveIn(const SUnit *SU) {
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SDNode *N = SU->getNode();
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return N && N->getOpcode() == ISD::CopyFromReg &&
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N->getOperand(N->getNumOperands()-1).getValueType() != MVT::Flag;
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}
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/// CalcNodeSethiUllmanNumber - Compute Sethi Ullman number.
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/// Smaller number is the higher priority.
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static unsigned
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@ -986,11 +980,6 @@ namespace {
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unsigned getNodePriority(const SUnit *SU) const {
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assert(SU->NodeNum < SethiUllmanNumbers.size());
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unsigned Opc = SU->getNode() ? SU->getNode()->getOpcode() : 0;
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if (Opc == ISD::CopyFromReg && !isCopyFromLiveIn(SU))
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// CopyFromReg should be close to its def because it restricts
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// allocation choices. But if it is a livein then perhaps we want it
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// closer to its uses so it can be coalesced.
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return 0xffff;
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if (Opc == ISD::TokenFactor || Opc == ISD::CopyToReg)
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// CopyToReg should be close to its uses to facilitate coalescing and
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// avoid spilling.
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