Add callback to allow target to adjust latency of schedule dependency edge.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78910 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
index 0b0aa26..ca4ba56 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
@@ -18,6 +18,7 @@
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Target/TargetSubtarget.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
@@ -152,6 +153,8 @@
}
void ScheduleDAGSDNodes::AddSchedEdges() {
+ const TargetSubtarget &ST = TM.getSubtarget<TargetSubtarget>();
+
// Pass 2: add the preds, succs, etc.
for (unsigned su = 0, e = SUnits.size(); su != e; ++su) {
SUnit *SU = &SUnits[su];
@@ -206,8 +209,13 @@
// dependency. This may change in the future though.
if (Cost >= 0)
PhysReg = 0;
- SU->addPred(SDep(OpSU, isChain ? SDep::Order : SDep::Data,
- OpSU->Latency, PhysReg));
+
+ const SDep& dep = SDep(OpSU, isChain ? SDep::Order : SDep::Data,
+ OpSU->Latency, PhysReg);
+ if (!isChain)
+ ST.adjustSchedDependency((SDep &)dep);
+
+ SU->addPred(dep);
}
}
}