1 files changed, 3 insertions, 3 deletions
diff --git a/llvm/lib/CodeGen/MachineScheduler.cpp b/llvm/lib/CodeGen/MachineScheduler.cpp
index ed5dff7..ba54324 100644
--- a/llvm/lib/CodeGen/MachineScheduler.cpp
+++ b/llvm/lib/CodeGen/MachineScheduler.cpp
@@ -2305,10 +2305,10 @@ unsigned SchedBoundary::getNextResourceCycleByInstance(unsigned InstanceIdx,
   unsigned NextUnreserved = ReservedCycles[InstanceIdx];
   // If this resource has never been used, always return cycle zero.
   if (NextUnreserved == InvalidCycle)
-    return 0;
+    return CurrCycle;
   // For bottom-up scheduling add the cycles needed for the current operation.
   if (!isTop())
-    NextUnreserved += Cycles;
+    NextUnreserved = std::max(CurrCycle, NextUnreserved + Cycles);
   return NextUnreserved;
 }
 
@@ -2712,7 +2712,7 @@ void SchedBoundary::bumpNode(SUnit *SU) {
 
             unsigned ReservedUntil, InstanceIdx;
             std::tie(ReservedUntil, InstanceIdx) =
-                getNextResourceCycle(SC, PIdx, 0, PI->StartAtCycle);
+                getNextResourceCycle(SC, PIdx, PI->Cycles, PI->StartAtCycle);
             if (isTop()) {
               ReservedCycles[InstanceIdx] =
                   std::max(ReservedUntil, NextCycle + PI->Cycles);