diff options
Diffstat (limited to 'include/llvm/Target/TargetInstrItineraries.h')
| -rw-r--r-- | include/llvm/Target/TargetInstrItineraries.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/include/llvm/Target/TargetInstrItineraries.h b/include/llvm/Target/TargetInstrItineraries.h index a95b70f..198d585 100644 --- a/include/llvm/Target/TargetInstrItineraries.h +++ b/include/llvm/Target/TargetInstrItineraries.h @@ -155,9 +155,13 @@ public: /// in the itinerary. /// unsigned getStageLatency(unsigned ItinClassIndx) const { - // If the target doesn't provide itinerary information, use a - // simple non-zero default value for all instructions. - if (isEmpty()) + // If the target doesn't provide itinerary information, use a simple + // non-zero default value for all instructions. Some target's provide a + // dummy (Generic) itinerary which should be handled as if it's itinerary is + // empty. We identify this by looking for a reference to stage zero (invalid + // stage). This is different from beginStage == endState != 0, which could + // be used for zero-latency pseudo ops. + if (isEmpty() || Itineraries[ItinClassIndx].FirstStage == 0) return 1; // Calculate the maximum completion time for any stage. |
