diff options
| -rw-r--r-- | llvm/lib/Target/ARM/ARMISelLowering.cpp | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp index 2b27a7e4e6a..e3bc3fa9b3d 100644 --- a/llvm/lib/Target/ARM/ARMISelLowering.cpp +++ b/llvm/lib/Target/ARM/ARMISelLowering.cpp @@ -4860,12 +4860,21 @@ ARMTargetLowering::EmitAtomicCmpSwap(MachineInstr *MI, unsigned ptr = MI->getOperand(1).getReg(); unsigned oldval = MI->getOperand(2).getReg(); unsigned newval = MI->getOperand(3).getReg(); - unsigned scratch = BB->getParent()->getRegInfo() - .createVirtualRegister(ARM::GPRRegisterClass); const TargetInstrInfo *TII = getTargetMachine().getInstrInfo(); DebugLoc dl = MI->getDebugLoc(); bool isThumb2 = Subtarget->isThumb2(); + MachineRegisterInfo &MRI = BB->getParent()->getRegInfo(); + unsigned scratch = + MRI.createVirtualRegister(isThumb2 ? ARM::tGPRRegisterClass + : ARM::GPRRegisterClass); + + if (isThumb2) { + MRI.constrainRegClass(dest, ARM::tGPRRegisterClass); + MRI.constrainRegClass(oldval, ARM::tGPRRegisterClass); + MRI.constrainRegClass(newval, ARM::tGPRRegisterClass); + } + unsigned ldrOpc, strOpc; switch (Size) { default: llvm_unreachable("unsupported size for AtomicCmpSwap!"); |
