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Use the TargetInstrInfo::commuteInstruction method to commute instructions

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instead of doing it manually.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19685 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-19 07:08:42 +00:00
parent 167b10cba4
commit c71d6949b9
1 changed files with 17 additions and 6 deletions
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23
lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -141,12 +141,23 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
unsigned regC = mi->getOperand(2).getReg();
if (LV.KillsRegister(mi, regC)) {
DEBUG(std::cerr << "2addr: COMMUTING : " << *mi);
mi->SetMachineOperandReg(2, regB);
mi->SetMachineOperandReg(1, regC);
DEBUG(std::cerr << "2addr: COMMUTED TO: " << *mi);
++NumCommuted;
regB = regC;
goto InstructionRearranged;
MachineInstr *NewMI = TII.commuteInstruction(mi);
if (NewMI == 0) {
DEBUG(std::cerr << "2addr: COMMUTING FAILED!\n");
} else {
DEBUG(std::cerr << "2addr: COMMUTED TO: " << *NewMI);
// If the instruction changed to commute it, update livevar.
if (NewMI != mi) {
LV.instructionChanged(mi, NewMI); // Update live variables
mbbi->insert(mi, NewMI); // Insert the new inst
mbbi->erase(mi); // Nuke the old inst.
mi = NewMI;
}
++NumCommuted;
regB = regC;
goto InstructionRearranged;
}
}
}
// If this instruction is potentially convertible to a true