[llvm-commits] [llvm] r142437 - /llvm/trunk/lib/Target/ARM/ARMISelLowering.cpp
Bill Wendling
isanbard at gmail.com
Tue Oct 18 15:49:07 PDT 2011
Author: void
Date: Tue Oct 18 17:49:07 2011
New Revision: 142437
URL: http://llvm.org/viewvc/llvm-project?rev=142437&view=rev
Log:
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.
Modified:
llvm/trunk/lib/Target/ARM/ARMISelLowering.cpp
Modified: llvm/trunk/lib/Target/ARM/ARMISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMISelLowering.cpp?rev=142437&r1=142436&r2=142437&view=diff
==============================================================================
--- llvm/trunk/lib/Target/ARM/ARMISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/ARM/ARMISelLowering.cpp Tue Oct 18 17:49:07 2011
@@ -5672,7 +5672,9 @@
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 @@
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 @@
.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)
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