diff options
| author | Chris Lattner <sabre@nondot.org> | 2005-01-19 07:08:42 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2005-01-19 07:08:42 +0000 |
| commit | c71d6949b91e19610f0f85f57b402b4df43019a5 (patch) | |
| tree | 73835252ae66f6fbab344aa49a5f66489a3898bb /lib/CodeGen/TwoAddressInstructionPass.cpp | |
| parent | 167b10cba4eff57718feeb30f567e324b96a9263 (diff) | |
Use the TargetInstrInfo::commuteInstruction method to commute instructions
instead of doing it manually.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19685 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/TwoAddressInstructionPass.cpp')
| -rw-r--r-- | lib/CodeGen/TwoAddressInstructionPass.cpp | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/lib/CodeGen/TwoAddressInstructionPass.cpp b/lib/CodeGen/TwoAddressInstructionPass.cpp index a03966802b..df632100de 100644 --- a/lib/CodeGen/TwoAddressInstructionPass.cpp +++ b/lib/CodeGen/TwoAddressInstructionPass.cpp @@ -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 |