diff options
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/LiveRangeEdit.cpp | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/llvm/lib/CodeGen/LiveRangeEdit.cpp b/llvm/lib/CodeGen/LiveRangeEdit.cpp index 01fc0a45d3d..4bc65fcdd1c 100644 --- a/llvm/lib/CodeGen/LiveRangeEdit.cpp +++ b/llvm/lib/CodeGen/LiveRangeEdit.cpp @@ -272,10 +272,11 @@ void LiveRangeEdit::eliminateDeadDef(MachineInstr *MI, ToShrinkSet &ToShrink, bool ReadsPhysRegs = false; bool isOrigDef = false; unsigned Dest; - if (VRM && MI->getOperand(0).isReg() && MI->getOperand(0).isDef()) { - // It is assumed that callers of eliminateDeadDefs() will never pass in dead - // instructions with multiple virtual register defs. - assert(MI->getDesc().getNumDefs() == 1 && "Unexpected instruction with multiple defs."); + // Only optimize rematerialize case when the instruction has one def, since + // otherwise we could leave some dead defs in the code. This case is + // extremely rare. + if (VRM && MI->getOperand(0).isReg() && MI->getOperand(0).isDef() && + MI->getDesc().getNumDefs() == 1) { Dest = MI->getOperand(0).getReg(); unsigned Original = VRM->getOriginal(Dest); LiveInterval &OrigLI = LIS.getInterval(Original); |
