Use the integer compare when the value is small enough. Use the "move into a
register and then compare against that" method when it's too large. We have to move the value into the register in the "movw, movt" pair of instructions. llvm-svn: 142440
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@ -5672,9 +5672,7 @@ EmitSjLjDispatchBlock(MachineInstr *MI, MachineBasicBlock *MBB) const {
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MachineRegisterInfo *MRI = &MF->getRegInfo();
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ARMFunctionInfo *AFI = MF->getInfo<ARMFunctionInfo>();
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MachineFrameInfo *MFI = MF->getFrameInfo();
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MachineConstantPool *MCP = MF->getConstantPool();
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int FI = MFI->getFunctionContextIndex();
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const Function *F = MF->getFunction();
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const TargetRegisterClass *TRC =
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Subtarget->isThumb() ? ARM::tGPRRegisterClass : ARM::GPRRegisterClass;
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@ -5863,6 +5861,23 @@ EmitSjLjDispatchBlock(MachineInstr *MI, MachineBasicBlock *MBB) const {
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.addImm(4)
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.addMemOperand(FIMMOLd));
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if (NumLPads < 256) {
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AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::CMPri))
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.addReg(NewVReg1)
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.addImm(NumLPads));
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} else {
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unsigned VReg1 = MRI->createVirtualRegister(TRC);
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AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::MOVi16), VReg1)
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.addImm(NumLPads & 0xFF));
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unsigned VReg2 = MRI->createVirtualRegister(TRC);
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AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::MOVTi16), VReg2)
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.addReg(VReg1)
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.addImm(NumLPads >> 16));
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AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::CMPrr))
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.addReg(NewVReg1)
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.addReg(VReg2));
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}
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unsigned NewVReg2 = MRI->createVirtualRegister(TRC);
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AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::MOVi16), NewVReg2)
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.addImm(LPadList.size()));
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