ScheduleDAGInstrs: Consider sub-registers when computing vreg def dependenciesmi-sched-experimental

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/CodeGen/ScheduleDAGInstrs.cpp b/lib/CodeGen/ScheduleDAGInstrs.cpp
index d8d8422f0ed..6cdef8200b7 100644
--- a/lib/CodeGen/ScheduleDAGInstrs.cpp
+++ b/lib/CodeGen/ScheduleDAGInstrs.cpp
@@ -375,11 +375,12 @@ void ScheduleDAGInstrs::addPhysRegDeps(SUnit *SU, unsigned OperIdx) {
 void ScheduleDAGInstrs::addVRegDefDeps(SUnit *SU, unsigned OperIdx) {
   const MachineInstr *MI = SU->getInstr();
   unsigned Reg = MI->getOperand(OperIdx).getReg();
+  unsigned SubReg = MI->getOperand(OperIdx).getSubReg();
 
   // Singly defined vregs do not have output/anti dependencies.
   // The current operand is a def, so we have at least one.
   // Check here if there are any others...
-  if (MRI.hasOneDef(Reg))
+  if (MRI.hasOneDef(Reg, SubReg))
     return;
 
   // Add output dependence to the next nearest def of this vreg.