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Don't try to sink 3-address instruction if convertToThreeAddress created more than one instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48336 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -291,7 +291,12 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
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if (MachineInstr *New=TII->convertToThreeAddress(mbbi, mi, *LV)) {
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DOUT << "2addr: CONVERTING 2-ADDR: " << *mi;
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DOUT << "2addr: TO 3-ADDR: " << *New;
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bool Sunk = Sink3AddrInstruction(mbbi, New, regB, mi);
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bool Sunk = false;
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if (New->findRegisterUseOperand(regB, New, TRI))
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// FIXME: Temporary workaround. If the new instruction doesn't
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// uses regB, convertToThreeAddress must have created more
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// then one instruction.
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Sunk = Sink3AddrInstruction(mbbi, New, regB, mi);
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mbbi->erase(mi); // Nuke the old inst.
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if (!Sunk) mi = New;
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++NumConvertedTo3Addr;
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