[Power9] Add a specific heuristic to schedule the addi before the load
When we are scheduling the load and addi, if all other heuristic didn't take effect,
we will try to schedule the addi before the load, to hide the latency, and avoid the
true dependency added by RA. And this only take effects for Power9.
Differential Revision: https://reviews.llvm.org/D61930
llvm-svn: 361600
diff --git a/llvm/lib/Target/PowerPC/PPCMachineScheduler.h b/llvm/lib/Target/PowerPC/PPCMachineScheduler.h
index ea6d3ff..93532d9 100644
--- a/llvm/lib/Target/PowerPC/PPCMachineScheduler.h
+++ b/llvm/lib/Target/PowerPC/PPCMachineScheduler.h
@@ -22,6 +22,13 @@
public:
PPCPreRASchedStrategy(const MachineSchedContext *C) :
GenericScheduler(C) {}
+protected:
+ void tryCandidate(SchedCandidate &Cand, SchedCandidate &TryCand,
+ SchedBoundary *Zone) const override;
+private:
+ bool biasAddiLoadCandidate(SchedCandidate &Cand,
+ SchedCandidate &TryCand,
+ SchedBoundary &Zone) const;
};
/// A MachineSchedStrategy implementation for PowerPC post RA scheduling.