diff options
Diffstat (limited to 'llvm/lib/CodeGen/ScheduleDAGInstrs.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/ScheduleDAGInstrs.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp b/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp index d184c0e240f..a9b5e88e5b4 100644 --- a/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp +++ b/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp @@ -323,6 +323,9 @@ void ScheduleDAGInstrs::addPhysRegDeps(SUnit *SU, unsigned OperIdx) { MachineInstr *MI = SU->getInstr(); MachineOperand &MO = MI->getOperand(OperIdx); unsigned Reg = MO.getReg(); + // We do not need to track any dependencies for constant registers. + if (MRI.isConstantPhysReg(Reg)) + return; // Optionally add output and anti dependencies. For anti // dependencies we use a latency of 0 because for a multi-issue |
