lib/CodeGen/TwoAddressInstructionPass.cpp

105   bool isProfitableToCommute(unsigned regA, unsigned regB, unsigned regC,
508 isProfitableToCommute(unsigned regA, unsigned regB, unsigned regC,
546     unsigned FromRegB = getMappedReg(regB, SrcRegMap);
560   // If there is a use of regB between its last def (could be livein) and this
563   if (!noUseAfterLastDef(regB, Dist, LastDefB))
1103   unsigned regB = MI.getOperand(SrcIdx).getReg();
1105   assert(TargetRegisterInfo::isVirtualRegister(regB) &&
1107   bool regBKilled = isKilled(MI, regB, MRI, TII, LIS, true);
1131       else if (isProfitableToCommute(regA, regB, regC, &MI, Dist)) {
1139   if (TryCommute && commuteInstruction(mi, regB, regC, Dist)) {
1149   // If there is one more use of regB later in the same MBB, consider
1151   if (EnableRescheduling && rescheduleMIBelowKill(mi, nmi, regB)) {
1159     if (!regBKilled || isProfitableToConv3Addr(regA, regB)) {
1161       if (convertInstTo3Addr(mi, nmi, regA, regB, Dist)) {
1168   // If there is one more use of regB later in the same MBB, consider
1170   if (EnableRescheduling && rescheduleKillAboveMI(mi, nmi, regB)) {
1222         unsigned NewSrcIdx = NewMIs[1]->findRegisterUseOperandIdx(regB);
1431       // Replace other (un-tied) uses of regB with LastCopiedReg.
1444     // Update live variables for regB.
1464     // Some tied uses of regB matched their destination registers, so
1465     // regB is still used in this instruction, but a kill flag was
1466     // removed from a different tied use of regB, so now we need to add
1467     // a kill flag to one of the remaining uses of regB.