TRI->getMinimalPhysRegClass(Reg, VT);
const TargetRegisterClass *DestRC = TRI->getCrossCopyRegClass(RC);
- // If cross copy register class is null, then it must be possible copy
- // the value directly. Do not try duplicate the def.
+ // If cross copy register class is the same as RC, then it must be
+ // possible copy the value directly. Do not try duplicate the def.
+ // If cross copy register class is not the same as RC, then it's
+ // possible to copy the value but it require cross register class copies
+ // and it is expensive.
+ // If cross copy register class is null, then it's not possible to copy
+ // the value at all.
SUnit *NewDef = 0;
- if (DestRC)
+ if (DestRC != RC) {
NewDef = CopyAndMoveSuccessors(LRDef);
- else
- DestRC = RC;
+ if (!DestRC && !NewDef)
+ report_fatal_error("Can't handle live physical "
+ "register dependency!");
+ }
if (!NewDef) {
// Issue copies, these can be expensive cross register class copies.
SmallVector<SUnit*, 2> Copies;