Model Cortex-a9 load to SUB, RSB, ADD, ADC, SBC, RSC, CMN, MVN, or CMP
pipeline forwarding path.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115098 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/ScheduleDAGInstrs.cpp b/lib/CodeGen/ScheduleDAGInstrs.cpp
index da0b056..3d2565d 100644
--- a/lib/CodeGen/ScheduleDAGInstrs.cpp
+++ b/lib/CodeGen/ScheduleDAGInstrs.cpp
@@ -527,26 +527,23 @@
MachineInstr *DefMI = Def->getInstr();
int DefIdx = DefMI->findRegisterDefOperandIdx(Reg);
if (DefIdx != -1) {
- int DefCycle = InstrItins->getOperandCycle(DefMI->getDesc().getSchedClass(),
- DefIdx);
- if (DefCycle >= 0) {
- MachineInstr *UseMI = Use->getInstr();
- const unsigned UseClass = UseMI->getDesc().getSchedClass();
+ unsigned DefClass = DefMI->getDesc().getSchedClass();
+ MachineInstr *UseMI = Use->getInstr();
+ unsigned UseClass = UseMI->getDesc().getSchedClass();
- // For all uses of the register, calculate the maxmimum latency
- int Latency = -1;
- for (unsigned i = 0, e = UseMI->getNumOperands(); i != e; ++i) {
- const MachineOperand &MO = UseMI->getOperand(i);
- if (!MO.isReg() || !MO.isUse())
- continue;
- unsigned MOReg = MO.getReg();
- if (MOReg != Reg)
- continue;
+ // For all uses of the register, calculate the maxmimum latency
+ int Latency = -1;
+ for (unsigned i = 0, e = UseMI->getNumOperands(); i != e; ++i) {
+ const MachineOperand &MO = UseMI->getOperand(i);
+ if (!MO.isReg() || !MO.isUse())
+ continue;
+ unsigned MOReg = MO.getReg();
+ if (MOReg != Reg)
+ continue;
- int UseCycle = InstrItins->getOperandCycle(UseClass, i);
- if (UseCycle >= 0)
- Latency = std::max(Latency, DefCycle - UseCycle + 1);
- }
+ int UseCycle = InstrItins->getOperandLatency(DefClass, DefIdx,
+ UseClass, i);
+ Latency = std::max(Latency, UseCycle);
// If we found a latency, then replace the existing dependence latency.
if (Latency >= 0)