[AMDGPU] Remove unused function splitScalar64BitAddSub

Author: jayfoad

llvm/lib/Target/AMDGPU/SIInstrInfo.cpp

@@ -7559,80 +7559,6 @@ void SIInstrInfo::splitScalar64BitUnaryOp(SIInstrWorklist &Worklist,
   addUsersToMoveToVALUWorklist(FullDestReg, MRI, Worklist);
 }
 
-void SIInstrInfo::splitScalar64BitAddSub(SIInstrWorklist &Worklist,
-                                         MachineInstr &Inst,
-                                         MachineDominatorTree *MDT) const {
-  bool IsAdd = (Inst.getOpcode() == AMDGPU::S_ADD_U64_PSEUDO);
-
-  MachineBasicBlock &MBB = *Inst.getParent();
-  MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
-  const auto *CarryRC = RI.getRegClass(AMDGPU::SReg_1_XEXECRegClassID);
-
-  Register FullDestReg = MRI.createVirtualRegister(&AMDGPU::VReg_64RegClass);
-  Register DestSub0 = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
-  Register DestSub1 = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
-
-  Register CarryReg = MRI.createVirtualRegister(CarryRC);
-  Register DeadCarryReg = MRI.createVirtualRegister(CarryRC);
-
-  MachineOperand &Dest = Inst.getOperand(0);
-  MachineOperand &Src0 = Inst.getOperand(1);
-  MachineOperand &Src1 = Inst.getOperand(2);
-  const DebugLoc &DL = Inst.getDebugLoc();
-  MachineBasicBlock::iterator MII = Inst;
-
-  const TargetRegisterClass *Src0RC = MRI.getRegClass(Src0.getReg());
-  const TargetRegisterClass *Src1RC = MRI.getRegClass(Src1.getReg());
-  const TargetRegisterClass *Src0SubRC =
-      RI.getSubRegisterClass(Src0RC, AMDGPU::sub0);
-  const TargetRegisterClass *Src1SubRC =
-      RI.getSubRegisterClass(Src1RC, AMDGPU::sub0);
-
-  MachineOperand SrcReg0Sub0 = buildExtractSubRegOrImm(MII, MRI, Src0, Src0RC,
-                                                       AMDGPU::sub0, Src0SubRC);
-  MachineOperand SrcReg1Sub0 = buildExtractSubRegOrImm(MII, MRI, Src1, Src1RC,
-                                                       AMDGPU::sub0, Src1SubRC);
-
-
-  MachineOperand SrcReg0Sub1 = buildExtractSubRegOrImm(MII, MRI, Src0, Src0RC,
-                                                       AMDGPU::sub1, Src0SubRC);
-  MachineOperand SrcReg1Sub1 = buildExtractSubRegOrImm(MII, MRI, Src1, Src1RC,
-                                                       AMDGPU::sub1, Src1SubRC);
-
-  unsigned LoOpc = IsAdd ? AMDGPU::V_ADD_CO_U32_e64 : AMDGPU::V_SUB_CO_U32_e64;
-  MachineInstr *LoHalf =
-    BuildMI(MBB, MII, DL, get(LoOpc), DestSub0)
-    .addReg(CarryReg, RegState::Define)
-    .add(SrcReg0Sub0)
-    .add(SrcReg1Sub0)
-    .addImm(0); // clamp bit
-
-  unsigned HiOpc = IsAdd ? AMDGPU::V_ADDC_U32_e64 : AMDGPU::V_SUBB_U32_e64;
-  MachineInstr *HiHalf =
-    BuildMI(MBB, MII, DL, get(HiOpc), DestSub1)
-    .addReg(DeadCarryReg, RegState::Define | RegState::Dead)
-    .add(SrcReg0Sub1)
-    .add(SrcReg1Sub1)
-    .addReg(CarryReg, RegState::Kill)
-    .addImm(0); // clamp bit
-
-  BuildMI(MBB, MII, DL, get(TargetOpcode::REG_SEQUENCE), FullDestReg)
-    .addReg(DestSub0)
-    .addImm(AMDGPU::sub0)
-    .addReg(DestSub1)
-    .addImm(AMDGPU::sub1);
-
-  MRI.replaceRegWith(Dest.getReg(), FullDestReg);
-
-  // Try to legalize the operands in case we need to swap the order to keep it
-  // valid.
-  legalizeOperands(*LoHalf, MDT);
-  legalizeOperands(*HiHalf, MDT);
-
-  // Move all users of this moved value.
-  addUsersToMoveToVALUWorklist(FullDestReg, MRI, Worklist);
-}
-
 void SIInstrInfo::splitScalar64BitBinaryOp(SIInstrWorklist &Worklist,
                                            MachineInstr &Inst, unsigned Opcode,
                                            MachineDominatorTree *MDT) const {

llvm/lib/Target/AMDGPU/SIInstrInfo.h

@@ -134,9 +134,6 @@ class SIInstrInfo final : public AMDGPUGenInstrInfo {
   void splitScalar64BitUnaryOp(SIInstrWorklist &Worklist, MachineInstr &Inst,
                                unsigned Opcode, bool Swap = false) const;
 
-  void splitScalar64BitAddSub(SIInstrWorklist &Worklist, MachineInstr &Inst,
-                              MachineDominatorTree *MDT = nullptr) const;
-
   void splitScalar64BitBinaryOp(SIInstrWorklist &Worklist, MachineInstr &Inst,
                                 unsigned Opcode,
                                 MachineDominatorTree *MDT = nullptr) const;