diff options
Diffstat (limited to 'llvm/lib/CodeGen/MachineRegisterInfo.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineRegisterInfo.cpp | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/llvm/lib/CodeGen/MachineRegisterInfo.cpp b/llvm/lib/CodeGen/MachineRegisterInfo.cpp index 6f636a1..394b99b 100644 --- a/llvm/lib/CodeGen/MachineRegisterInfo.cpp +++ b/llvm/lib/CodeGen/MachineRegisterInfo.cpp @@ -407,9 +407,11 @@ void MachineRegisterInfo::replaceRegWith(Register FromReg, Register ToReg) { MachineInstr *MachineRegisterInfo::getVRegDef(Register Reg) const { // Since we are in SSA form, we can use the first definition. def_instr_iterator I = def_instr_begin(Reg); - assert((I.atEnd() || std::next(I) == def_instr_end()) && - "getVRegDef assumes a single definition or no definition"); - return !I.atEnd() ? &*I : nullptr; + if (I == def_instr_end()) + return nullptr; + assert(std::next(I) == def_instr_end() && + "getVRegDef assumes at most one definition"); + return &*I; } /// getUniqueVRegDef - Return the unique machine instr that defines the |