- // The magic constant 200 corresponds to approx. 25 instructions since
- // SlotIndexes allocate 8 slots per instruction.
- //
- // The constant is added to avoid depending too much on accidental SlotIndex
- // gaps for small intervals. The effect is that small intervals have a spill
- // weight that is mostly proportional to the number of uses, while large
- // intervals get a spill weight that is closer to a use density.
- //
- return UseDefFreq / (Size + 200);
+ // The constant 25 instructions is added to avoid depending too much on
+ // accidental SlotIndex gaps for small intervals. The effect is that small
+ // intervals have a spill weight that is mostly proportional to the number
+ // of uses, while large intervals get a spill weight that is closer to a use
+ // density.
+ return UseDefFreq / (Size + 25*SlotIndex::InstrDist);