SmallVector<Register, 4> InitResultRegs;
SmallVector<Register, 4> PhiRegs;
+ // Track use registers which have already been expanded with a readfirstlane
+ // sequence. This may have multiple uses if moving a sequence.
+ DenseMap<Register, Register> WaterfalledRegMap;
+
MachineBasicBlock &MBB = B.getMBB();
MachineFunction *MF = &B.getMF();
if (!Op.isReg() || Op.isDef())
continue;
- if (!SGPROperandRegs.count(Op.getReg()))
+ Register OldReg = Op.getReg();
+ if (!SGPROperandRegs.count(OldReg))
continue;
+ // See if we already processed this register in another instruction in the
+ // sequence.
+ auto OldVal = WaterfalledRegMap.find(OldReg);
+ if (OldVal != WaterfalledRegMap.end()) {
+ Op.setReg(OldVal->second);
+ continue;
+ }
+
LLT OpTy = MRI.getType(Op.getReg());
unsigned OpSize = OpTy.getSizeInBits();
MRI.setRegBank(Op.getReg(), AMDGPU::SGPRRegBank);
}
+
+ // Make sure we don't re-process this register again.
+ WaterfalledRegMap.insert(std::make_pair(OldReg, Op.getReg()));
}
}