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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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17
lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -141,14 +141,25 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
unsigned regC = mi->getOperand(2).getReg(); unsigned regC = mi->getOperand(2).getReg();
if (LV.KillsRegister(mi, regC)) { if (LV.KillsRegister(mi, regC)) {
DEBUG(std::cerr << "2addr: COMMUTING : " << *mi); DEBUG(std::cerr << "2addr: COMMUTING : " << *mi);
mi->SetMachineOperandReg(2, regB); MachineInstr *NewMI = TII.commuteInstruction(mi);
mi->SetMachineOperandReg(1, regC); if (NewMI == 0) {
DEBUG(std::cerr << "2addr: COMMUTED TO: " << *mi); 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; ++NumCommuted;
regB = regC; regB = regC;
goto InstructionRearranged; goto InstructionRearranged;
} }
} }
}
// If this instruction is potentially convertible to a true // If this instruction is potentially convertible to a true
// three-address instruction, // three-address instruction,
if (TID.Flags & M_CONVERTIBLE_TO_3_ADDR) if (TID.Flags & M_CONVERTIBLE_TO_3_ADDR)