diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/X86InstrInfo.cpp | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp index 762a7bc665..20dd263d1f 100644 --- a/lib/Target/X86/X86InstrInfo.cpp +++ b/lib/Target/X86/X86InstrInfo.cpp @@ -904,15 +904,18 @@ X86InstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI, unsigned leaInReg = RegInfo.createVirtualRegister(&X86::GR32RegClass); unsigned leaOutReg = RegInfo.createVirtualRegister(&X86::GR32RegClass); - MachineInstr *Ins = - BuildMI(get(X86::INSERT_SUBREG), leaInReg).addReg(Src).addImm(2); - Ins->copyKillDeadInfo(MI); + // Build and insert into an implicit UNDEF value. This is OK because + // well be shifting and then extracting the lower 16-bits. + MachineInstr *Ins = + BuildMI(get(X86::INSERT_SUBREG),leaInReg).addImm(X86::IMPL_VAL_UNDEF) + .addReg(Src).addImm(X86::SUBREG_16BIT); NewMI = BuildMI(get(Opc), leaOutReg) .addReg(0).addImm(1 << ShAmt).addReg(leaInReg).addImm(0); MachineInstr *Ext = - BuildMI(get(X86::EXTRACT_SUBREG), Dest).addReg(leaOutReg).addImm(2); + BuildMI(get(X86::EXTRACT_SUBREG), Dest) + .addReg(leaOutReg).addImm(X86::SUBREG_16BIT); Ext->copyKillDeadInfo(MI); MFI->insert(MBBI, Ins); // Insert the insert_subreg |