- mi != me; ++mi) {
-
- if (mi->getOpcode() == TargetInstrInfo::EXTRACT_SUBREG) {
- assert(mi->getOperand(0).isRegister() && mi->getOperand(0).isDef() &&
- mi->getOperand(1).isRegister() && mi->getOperand(1).isUse() &&
- mi->getOperand(2).isImm() && "Malformed extract_subreg");
-
- unsigned SuperReg = mi->getOperand(1).getReg();
- unsigned SubIdx = mi->getOperand(2).getImm();
-
- assert(MRegisterInfo::isPhysicalRegister(SuperReg) &&
- "Extract supperg source must be a physical register");
- unsigned SrcReg = MRI.getSubReg(SuperReg, SubIdx);
- unsigned DstReg = mi->getOperand(0).getReg();
-
- DOUT << "subreg: CONVERTING: " << *mi;
-
- if (SrcReg != DstReg) {
- const TargetRegisterClass *TRC = 0;
- if (MRegisterInfo::isPhysicalRegister(DstReg)) {
- TRC = getPhysicalRegisterRegClass(MRI, DstReg);
- } else {
- TRC = MF.getSSARegMap()->getRegClass(DstReg);
- }
- assert(TRC == getPhysicalRegisterRegClass(MRI, SrcReg) &&
- "Extract subreg and Dst must be of same register class");
-
- MRI.copyRegToReg(*mbbi, mi, DstReg, SrcReg, TRC);
- MachineBasicBlock::iterator dmi = mi;
- DOUT << "subreg: " << *(--dmi);
- }
-
- DOUT << "\n";
- mbbi->erase(mi);
- MadeChange = true;
-
- } else if (mi->getOpcode() == TargetInstrInfo::INSERT_SUBREG) {
-
- unsigned DstReg = 0;
- unsigned SrcReg = 0;
- unsigned InsReg = 0;
- unsigned SubIdx = 0;
-
- // If only have 3 operands, then the source superreg is undef
- // and we can supress the copy from the undef value
- if (mi->getNumOperands() == 3) {
- assert((mi->getOperand(0).isRegister() && mi->getOperand(0).isDef()) &&
- (mi->getOperand(1).isRegister() && mi->getOperand(1).isUse()) &&
- mi->getOperand(2).isImm() && "Invalid extract_subreg");
- DstReg = mi->getOperand(0).getReg();
- SrcReg = DstReg;
- InsReg = mi->getOperand(1).getReg();
- SubIdx = mi->getOperand(2).getImm();
- } else if (mi->getNumOperands() == 4) {
- assert((mi->getOperand(0).isRegister() && mi->getOperand(0).isDef()) &&
- (mi->getOperand(1).isRegister() && mi->getOperand(1).isUse()) &&
- (mi->getOperand(2).isRegister() && mi->getOperand(2).isUse()) &&
- mi->getOperand(3).isImm() && "Invalid extract_subreg");
- DstReg = mi->getOperand(0).getReg();
- SrcReg = mi->getOperand(1).getReg();
- InsReg = mi->getOperand(2).getReg();
- SubIdx = mi->getOperand(3).getImm();
- } else
- assert(0 && "Malformed extract_subreg");
-
- assert(SubIdx != 0 && "Invalid index for extract_subreg");
- unsigned DstSubReg = MRI.getSubReg(DstReg, SubIdx);
-
- assert(MRegisterInfo::isPhysicalRegister(SrcReg) &&
- "Insert superreg source must be in a physical register");
- assert(MRegisterInfo::isPhysicalRegister(DstReg) &&
- "Insert destination must be in a physical register");
- assert(MRegisterInfo::isPhysicalRegister(InsReg) &&
- "Inserted value must be in a physical register");
-
- DOUT << "subreg: CONVERTING: " << *mi;
-
- // If the inserted register is already allocated into a subregister
- // of the destination, we copy the subreg into the source
- // However, this is only safe if the insert instruction is the kill
- // of the source register
- bool revCopyOrder = isSubRegOf(MRI, InsReg, DstReg);
- if (revCopyOrder) {
- if (mi->getOperand(1).isKill()) {
- DstSubReg = MRI.getSubReg(SrcReg, SubIdx);
- // Insert sub-register copy
- const TargetRegisterClass *TRC1 = 0;
- if (MRegisterInfo::isPhysicalRegister(InsReg)) {
- TRC1 = getPhysicalRegisterRegClass(MRI, InsReg);
- } else {
- TRC1 = MF.getSSARegMap()->getRegClass(InsReg);
- }
-
- MRI.copyRegToReg(*mbbi, mi, DstSubReg, InsReg, TRC1);
- MachineBasicBlock::iterator dmi = mi;
- DOUT << "subreg: " << *(--dmi);
- } else {
- assert(0 && "Don't know how to convert this insert");
- }
- }
-
- if (SrcReg != DstReg) {
- // Insert super-register copy
- const TargetRegisterClass *TRC0 = 0;
- if (MRegisterInfo::isPhysicalRegister(DstReg)) {
- TRC0 = getPhysicalRegisterRegClass(MRI, DstReg);
- } else {
- TRC0 = MF.getSSARegMap()->getRegClass(DstReg);
- }
- assert(TRC0 == getPhysicalRegisterRegClass(MRI, SrcReg) &&
- "Insert superreg and Dst must be of same register class");
-
- MRI.copyRegToReg(*mbbi, mi, DstReg, SrcReg, TRC0);
- MachineBasicBlock::iterator dmi = mi;
- DOUT << "subreg: " << *(--dmi);
- }
-
- if (!revCopyOrder && InsReg != DstSubReg) {
- // Insert sub-register copy
- const TargetRegisterClass *TRC1 = 0;
- if (MRegisterInfo::isPhysicalRegister(InsReg)) {
- TRC1 = getPhysicalRegisterRegClass(MRI, InsReg);
- } else {
- TRC1 = MF.getSSARegMap()->getRegClass(InsReg);
- }
-
- MRI.copyRegToReg(*mbbi, mi, DstSubReg, InsReg, TRC1);
- MachineBasicBlock::iterator dmi = mi;
- DOUT << "subreg: " << *(--dmi);
- }
-
- DOUT << "\n";
- mbbi->erase(mi);
- MadeChange = true;