diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp')
-rw-r--r-- | lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp | 17 |
1 files changed, 5 insertions, 12 deletions
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp index 7b560d173e..e3da208452 100644 --- a/lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp +++ b/lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp @@ -570,20 +570,13 @@ void ScheduleDAGFast::ListScheduleBottomUp() { TRI->getMinimalPhysRegClass(Reg, VT); const TargetRegisterClass *DestRC = TRI->getCrossCopyRegClass(RC); - // 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. + // If cross copy register class is null, then it must be possible copy + // the value directly. Do not try duplicate the def. SUnit *NewDef = 0; - if (DestRC != RC) { + if (DestRC) NewDef = CopyAndMoveSuccessors(LRDef); - if (!DestRC && !NewDef) - report_fatal_error("Can't handle live physical " - "register dependency!"); - } + else + DestRC = RC; if (!NewDef) { // Issue copies, these can be expensive cross register class copies. SmallVector<SUnit*, 2> Copies; |