canClobberPhysRegDefs shouldn't called without checking hasPhysRegDefs;

check this with an assert.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52603 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
index 6175bc275ea6ddcaeed8ddc458d32df0426932a4..a50dd7b7c5d37c33476b292f4d95dfcdd71d2f3b 100644 (file)
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
@@ -1572,15 +1572,14 @@ static bool hasCopyToRegUse(SUnit *SU) {
 }
 
 /// canClobberPhysRegDefs - True if SU would clobber one of SuccSU's
-/// physical register def.
+/// physical register defs.
 static bool canClobberPhysRegDefs(SUnit *SuccSU, SUnit *SU,
                                   const TargetInstrInfo *TII,
                                   const TargetRegisterInfo *TRI) {
   SDNode *N = SuccSU->Node;
   unsigned NumDefs = TII->get(N->getTargetOpcode()).getNumDefs();
   const unsigned *ImpDefs = TII->get(N->getTargetOpcode()).getImplicitDefs();
-  if (!ImpDefs)
-    return false;
+  assert(ImpDefs && "Caller should check hasPhysRegDefs");
   const unsigned *SUImpDefs =
     TII->get(SU->Node->getTargetOpcode()).getImplicitDefs();
   if (!SUImpDefs)