diff options
| -rw-r--r-- | lib/Target/X86/X86InstrInfo.cpp | 7 | ||||
| -rw-r--r-- | test/CodeGen/X86/2012-07-16-LeaUndef.ll | 16 |
2 files changed, 23 insertions, 0 deletions
diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp index 9f5f66e37c..8ba3194505 100644 --- a/lib/Target/X86/X86InstrInfo.cpp +++ b/lib/Target/X86/X86InstrInfo.cpp @@ -2016,6 +2016,13 @@ X86InstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI, .addReg(Dest, RegState::Define | getDeadRegState(isDead)), Src, isKill, Src2, isKill2); + + // Preserve undefness of the operands. + bool isUndef = MI->getOperand(1).isUndef(); + bool isUndef2 = MI->getOperand(2).isUndef(); + NewMI->getOperand(1).setIsUndef(isUndef); + NewMI->getOperand(3).setIsUndef(isUndef2); + if (LV && isKill2) LV->replaceKillInstruction(Src2, MI, NewMI); break; diff --git a/test/CodeGen/X86/2012-07-16-LeaUndef.ll b/test/CodeGen/X86/2012-07-16-LeaUndef.ll new file mode 100644 index 0000000000..9e5cbd2f33 --- /dev/null +++ b/test/CodeGen/X86/2012-07-16-LeaUndef.ll @@ -0,0 +1,16 @@ +; RUN: llc < %s -march=x86-64 -mcpu=corei7 + +define void @autogen_SD2543() { +A: + %E83 = add i32 0, 1 + %E820 = add i32 0, undef + br label %C +C: + %B908 = add i32 %E83, %E820 + store i32 %B908, i32* undef + %Sl2391 = select i1 undef, i32 undef, i32 %E83 + %Cmp3114 = icmp ne i32 %Sl2391, undef + br i1 %Cmp3114, label %C, label %G +G: + ret void +} |