diff options
| author | Bill Wendling <isanbard@gmail.com> | 2011-10-18 22:49:07 +0000 |
|---|---|---|
| committer | Bill Wendling <isanbard@gmail.com> | 2011-10-18 22:49:07 +0000 |
| commit | 952cb50fee7181265c0feb4f656dbbe8c0101dfb (patch) | |
| tree | 46312e4229b6322bf0f29a7e23218dcef0c1f0af | |
| parent | 20b2b788b4f3914757789fe1ee835b70759ce4ec (diff) | |
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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142437 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/ARM/ARMISelLowering.cpp | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp index 18aa3b44b6..759d3b6e0d 100644 --- a/lib/Target/ARM/ARMISelLowering.cpp +++ b/lib/Target/ARM/ARMISelLowering.cpp @@ -5672,7 +5672,9 @@ EmitSjLjDispatchBlock(MachineInstr *MI, MachineBasicBlock *MBB) const { MachineRegisterInfo *MRI = &MF->getRegInfo(); ARMFunctionInfo *AFI = MF->getInfo<ARMFunctionInfo>(); MachineFrameInfo *MFI = MF->getFrameInfo(); + MachineConstantPool *MCP = MF->getConstantPool(); int FI = MFI->getFunctionContextIndex(); + const Function *F = MF->getFunction(); const TargetRegisterClass *TRC = Subtarget->isThumb() ? ARM::tGPRRegisterClass : ARM::GPRRegisterClass; @@ -5754,6 +5756,7 @@ EmitSjLjDispatchBlock(MachineInstr *MI, MachineBasicBlock *MBB) const { MachineMemOperand::MOLoad | MachineMemOperand::MOVolatile, 4, 4); + unsigned NumLPads = LPadList.size(); if (Subtarget->isThumb2()) { unsigned NewVReg1 = MRI->createVirtualRegister(TRC); AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::t2LDRi12), NewVReg1) @@ -5761,13 +5764,23 @@ EmitSjLjDispatchBlock(MachineInstr *MI, MachineBasicBlock *MBB) const { .addImm(4) .addMemOperand(FIMMOLd)); - unsigned NewVReg2 = MRI->createVirtualRegister(TRC); - AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::t2MOVi16), NewVReg2) - .addImm(LPadList.size())); + if (NumLPads < 256) { + AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::t2CMPri)) + .addReg(NewVReg1) + .addImm(LPadList.size())); + } else { + unsigned VReg1 = MRI->createVirtualRegister(TRC); + AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::t2MOVi16), VReg1) + .addImm(NumLPads & 0xFF)); + unsigned VReg2 = MRI->createVirtualRegister(TRC); + AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::t2MOVTi16), VReg2) + .addReg(VReg1) + .addImm(NumLPads >> 16)); + AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::t2CMPrr)) + .addReg(NewVReg1) + .addReg(VReg2)); + } - AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::t2CMPrr)) - .addReg(NewVReg1) - .addReg(NewVReg2)); BuildMI(DispatchBB, dl, TII->get(ARM::t2Bcc)) .addMBB(TrapBB) .addImm(ARMCC::HI) |