diff options
Diffstat (limited to 'lib/Target/BPF/BPFRegisterInfo.cpp')
| -rw-r--r-- | lib/Target/BPF/BPFRegisterInfo.cpp | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/lib/Target/BPF/BPFRegisterInfo.cpp b/lib/Target/BPF/BPFRegisterInfo.cpp index 8f885c3ea61b..952615bd1c2b 100644 --- a/lib/Target/BPF/BPFRegisterInfo.cpp +++ b/lib/Target/BPF/BPFRegisterInfo.cpp @@ -58,14 +58,13 @@ void BPFRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II, unsigned FrameReg = getFrameRegister(MF); int FrameIndex = MI.getOperand(i).getIndex(); + const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo(); + MachineBasicBlock &MBB = *MI.getParent(); if (MI.getOpcode() == BPF::MOV_rr) { - const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo(); int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex); MI.getOperand(i).ChangeToRegister(FrameReg, false); - - MachineBasicBlock &MBB = *MI.getParent(); unsigned reg = MI.getOperand(i - 1).getReg(); BuildMI(MBB, ++II, DL, TII.get(BPF::ADD_ri), reg) .addReg(reg) @@ -79,8 +78,24 @@ void BPFRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II, if (!isInt<32>(Offset)) llvm_unreachable("bug in frame offset"); - MI.getOperand(i).ChangeToRegister(FrameReg, false); - MI.getOperand(i + 1).ChangeToImmediate(Offset); + if (MI.getOpcode() == BPF::FI_ri) { + // architecture does not really support FI_ri, replace it with + // MOV_rr <target_reg>, frame_reg + // ADD_ri <target_reg>, imm + unsigned reg = MI.getOperand(i - 1).getReg(); + + BuildMI(MBB, ++II, DL, TII.get(BPF::MOV_rr), reg) + .addReg(FrameReg); + BuildMI(MBB, II, DL, TII.get(BPF::ADD_ri), reg) + .addReg(reg) + .addImm(Offset); + + // Remove FI_ri instruction + MI.eraseFromParent(); + } else { + MI.getOperand(i).ChangeToRegister(FrameReg, false); + MI.getOperand(i + 1).ChangeToImmediate(Offset); + } } unsigned BPFRegisterInfo::getFrameRegister(const MachineFunction &MF) const { |