If it is load cluster, we don't need to create the dependency edges(SUb->reg) from SUb to SUa
as they both depend on the base register "reg"
+-------+
+----> reg |
| +---+---+
| ^
| |
| |
| |
| +---+---+
| | SUa | Load 0(reg)
| +---+---+
| ^
| |
| |
| +---+---+
+----+ SUb | Load 4(reg)
+-------+
But if it is store cluster, we need to create it as follow shows to avoid the instruction store
depend on scheduled in-between SUb and SUa.
+-------+
+----> reg |
| +---+---+
| ^
| | Missing +-------+
| | +-------------------->+ y |
| | | +---+---+
| +---+-+-+ ^
| | SUa | Store x 0(reg) |
| +---+---+ |
| ^ |
| | +------------------------+
| | |
| +---+--++
+----+ SUb | Store y 4(reg)
+-------+
Reviewed By: evandro, arsenm, rampitec, foad, fhahn
Differential Revision: https://reviews.llvm.org/D72031
QingShan Zhang