From a5871dc1044ff31906f3a2cfc639c7fcd0a14c76 Mon Sep 17 00:00:00 2001 From: Bill Wendling Date: Tue, 18 Oct 2011 23:11:05 +0000 Subject: [PATCH] For Thumb mode, we need to use a constant pool if the value is too large to be used with the CMP instruction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142458 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/ARM/ARMISelLowering.cpp | 23 ++++++++++++++++++++--- 1 file changed, 20 insertions(+), 3 deletions(-) diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp index 236ea6f90a7..9cc1d335f2d 100644 --- a/lib/Target/ARM/ARMISelLowering.cpp +++ b/lib/Target/ARM/ARMISelLowering.cpp @@ -5809,9 +5809,26 @@ EmitSjLjDispatchBlock(MachineInstr *MI, MachineBasicBlock *MBB) const { .addImm(1) .addMemOperand(FIMMOLd)); - AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::tCMPi8)) - .addReg(NewVReg1) - .addImm(LPadList.size())); + if (NumLPads < 256) { + AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::tCMPi8)) + .addReg(NewVReg1) + .addImm(NumLPads)); + } else { + MachineConstantPool *ConstantPool = MF->getConstantPool(); + const Constant *C = + ConstantInt::get(Type::getInt32Ty(MF->getFunction()->getContext()), + NumLPads); + unsigned Idx = ConstantPool->getConstantPoolIndex(C, 4); + + unsigned VReg1 = MRI->createVirtualRegister(TRC); + AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::tLDRpci)) + .addReg(VReg1, RegState::Define) + .addConstantPoolIndex(Idx)); + AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::tCMPr)) + .addReg(NewVReg1) + .addReg(VReg1)); + } + BuildMI(DispatchBB, dl, TII->get(ARM::tBcc)) .addMBB(TrapBB) .addImm(ARMCC::HI) -- 2.34.1