diff options
Diffstat (limited to 'lib/CodeGen/LowerSubregs.cpp')
| -rw-r--r-- | lib/CodeGen/LowerSubregs.cpp | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/CodeGen/LowerSubregs.cpp b/lib/CodeGen/LowerSubregs.cpp index e9e60a0..358aa16 100644 --- a/lib/CodeGen/LowerSubregs.cpp +++ b/lib/CodeGen/LowerSubregs.cpp @@ -242,9 +242,12 @@ bool LowerSubregsInstructionPass::LowerInsert(MachineInstr *MI) { // No need to insert an identity copy instruction. If the SrcReg was // <undef>, we need to make sure it is alive by inserting an IMPLICIT_DEF if (MI->getOperand(1).isUndef() && !MI->getOperand(0).isDead()) { - BuildMI(*MBB, MI, MI->getDebugLoc(), - TII.get(TargetInstrInfo::IMPLICIT_DEF), DstReg) - .addReg(InsReg, RegState::ImplicitKill); + MachineInstrBuilder MIB = BuildMI(*MBB, MI, MI->getDebugLoc(), + TII.get(TargetInstrInfo::IMPLICIT_DEF), DstReg); + if (MI->getOperand(2).isUndef()) + MIB.addReg(InsReg, RegState::Implicit | RegState::Undef); + else + MIB.addReg(InsReg, RegState::ImplicitKill); } else { DOUT << "subreg: eliminated!\n"; MBB->erase(MI); |