diff options
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/ScheduleDAGInstrs.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp b/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp index 30e1846ef8b..fa42d393a3b 100644 --- a/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp +++ b/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp @@ -225,6 +225,12 @@ void ScheduleDAGInstrs::ComputeLatency(SUnit *SU) { // all nodes flagged together into this SUnit. SU->Latency = InstrItins.getLatency(SU->getInstr()->getDesc().getSchedClass()); + + // Simplistic target-independent heuristic: assume that loads take + // extra time. + if (InstrItins.isEmpty()) + if (SU->getInstr()->getDesc().mayLoad()) + SU->Latency += 2; } void ScheduleDAGInstrs::dumpNode(const SUnit *SU) const { |
