replica
/
hanchenye-llvm-project
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

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
This commit is contained in:
Bill Wendling 2011-10-18 22:52:20 +00:00
parent 9bede2dd92
commit 4969dcdef9
1 changed files with 17 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
llvm/lib/Target/ARM/ARMISelLowering.cpp
View File

@ -5672,9 +5672,7 @@ 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;
@ -5863,6 +5861,23 @@ EmitSjLjDispatchBlock(MachineInstr *MI, MachineBasicBlock *MBB) const {
.addImm(4)
.addMemOperand(FIMMOLd));
if (NumLPads < 256) {
AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::CMPri))
.addReg(NewVReg1)
.addImm(NumLPads));
} else {
unsigned VReg1 = MRI->createVirtualRegister(TRC);
AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::MOVi16), VReg1)
.addImm(NumLPads & 0xFF));
unsigned VReg2 = MRI->createVirtualRegister(TRC);
AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::MOVTi16), VReg2)
.addReg(VReg1)
.addImm(NumLPads >> 16));
AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::CMPrr))
.addReg(NewVReg1)
.addReg(VReg2));
}
unsigned NewVReg2 = MRI->createVirtualRegister(TRC);
AddDefaultPred(BuildMI(DispatchBB, dl, TII->get(ARM::MOVi16), NewVReg2)
.addImm(LPadList.size()));