+ case ISD::CopyFromReg: {
+ Emit(Op.getOperand(0)); // Emit the chain.
+ unsigned SrcReg = cast<RegisterSDNode>(Op.getOperand(1))->getReg();
+
+ // Figure out the register class to create for the destreg.
+ const TargetRegisterClass *TRC;
+ if (MRegisterInfo::isVirtualRegister(SrcReg)) {
+ TRC = RegMap->getRegClass(SrcReg);
+ } else {
+ // FIXME: we don't know what register class to generate this for. Do
+ // a brute force search and pick the first match. :(
+ for (MRegisterInfo::regclass_iterator I = MRI.regclass_begin(),
+ E = MRI.regclass_end(); I != E; ++I)
+ if ((*I)->contains(SrcReg)) {
+ TRC = *I;
+ break;
+ }
+ assert(TRC && "Couldn't find register class for reg copy!");
+ }
+
+ // Create the reg, emit the copy.
+ ResultReg = RegMap->createVirtualRegister(TRC);
+ MRI.copyRegToReg(*BB, BB->end(), ResultReg, SrcReg, TRC);
+ break;
+ }