diff options
Diffstat (limited to 'lib/Target/X86/X86ISelSimple.cpp')
| -rw-r--r-- | lib/Target/X86/X86ISelSimple.cpp | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/lib/Target/X86/X86ISelSimple.cpp b/lib/Target/X86/X86ISelSimple.cpp index e735f94..4e59ed1 100644 --- a/lib/Target/X86/X86ISelSimple.cpp +++ b/lib/Target/X86/X86ISelSimple.cpp @@ -2128,13 +2128,20 @@ void ISel::emitShiftOperation(MachineBasicBlock *MBB, } else { // Shifting more than 32 bits Amount -= 32; if (isLeftShift) { - BuildMI(*MBB, IP, X86::SHL32ri, 2, - DestReg + 1).addReg(SrcReg).addImm(Amount); - BuildMI(*MBB, IP, X86::MOV32ri, 1, - DestReg).addImm(0); + if (Amount != 0) { + BuildMI(*MBB, IP, X86::SHL32ri, 2, + DestReg + 1).addReg(SrcReg).addImm(Amount); + } else { + BuildMI(*MBB, IP, X86::MOV32rr, 1, DestReg+1).addReg(SrcReg); + } + BuildMI(*MBB, IP, X86::MOV32ri, 1, DestReg).addImm(0); } else { - unsigned Opcode = isSigned ? X86::SAR32ri : X86::SHR32ri; - BuildMI(*MBB, IP, Opcode, 2, DestReg).addReg(SrcReg+1).addImm(Amount); + if (Amount != 0) { + BuildMI(*MBB, IP, isSigned ? X86::SAR32ri : X86::SHR32ri, 2, + DestReg).addReg(SrcReg+1).addImm(Amount); + } else { + BuildMI(*MBB, IP, X86::MOV32rr, 1, DestReg).addReg(SrcReg+1); + } BuildMI(*MBB, IP, X86::MOV32ri, 1, DestReg+1).addImm(0); } } |