diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86InstrInfo.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86InstrInfo.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/llvm/lib/Target/X86/X86InstrInfo.cpp b/llvm/lib/Target/X86/X86InstrInfo.cpp index ff666ff3c27..650ab415ee5 100644 --- a/llvm/lib/Target/X86/X86InstrInfo.cpp +++ b/llvm/lib/Target/X86/X86InstrInfo.cpp @@ -920,10 +920,11 @@ X86InstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI, // Build and insert into an implicit UNDEF value. This is OK because // well be shifting and then extracting the lower 16-bits. + MachineInstr *Undef = BuildMI(get(X86::IMPLICIT_DEF), leaInReg); + MachineInstr *Ins = BuildMI(get(X86::INSERT_SUBREG),leaInReg) - .addImm(X86InstrInfo::IMPL_VAL_UNDEF) - .addReg(Src).addImm(X86::SUBREG_16BIT); + .addReg(leaInReg).addReg(Src).addImm(X86::SUBREG_16BIT); NewMI = BuildMI(get(Opc), leaOutReg) .addReg(0).addImm(1 << ShAmt).addReg(leaInReg).addImm(0); @@ -933,6 +934,7 @@ X86InstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI, .addReg(leaOutReg).addImm(X86::SUBREG_16BIT); Ext->copyKillDeadInfo(MI); + MFI->insert(MBBI, Undef); MFI->insert(MBBI, Ins); // Insert the insert_subreg LV.instructionChanged(MI, NewMI); // Update live variables LV.addVirtualRegisterKilled(leaInReg, NewMI); |
