diff options
Diffstat (limited to 'llvm/lib/CodeGen/ScheduleDAGInstrs.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/ScheduleDAGInstrs.cpp | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp b/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp index 3b431e71db0..40ed1b90b7d 100644 --- a/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp +++ b/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp @@ -712,6 +712,7 @@ void ScheduleDAGInstrs::buildSchedGraph(AliasAnalysis *AA, AAForDep = UseAA ? AA : nullptr; BarrierChain = nullptr; + SUnit *FPBarrierChain = nullptr; this->TrackLaneMasks = TrackLaneMasks; MISUnitMap.clear(); @@ -871,9 +872,21 @@ void ScheduleDAGInstrs::buildSchedGraph(AliasAnalysis *AA, addBarrierChain(NonAliasStores); addBarrierChain(NonAliasLoads); + // Add dependency against previous FP barrier and reset FP barrier. + if (FPBarrierChain) + FPBarrierChain->addPredBarrier(BarrierChain); + FPBarrierChain = BarrierChain; + continue; } + // Instructions that may raise FP exceptions depend on each other. + if (MI.mayRaiseFPException()) { + if (FPBarrierChain) + FPBarrierChain->addPredBarrier(SU); + FPBarrierChain = SU; + } + // If it's not a store or a variant load, we're done. if (!MI.mayStore() && !(MI.mayLoad() && !MI.isDereferenceableInvariantLoad(AA))) |
