diff options
Diffstat (limited to 'lib/CodeGen/MachineRegisterInfo.cpp')
| -rw-r--r-- | lib/CodeGen/MachineRegisterInfo.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/CodeGen/MachineRegisterInfo.cpp b/lib/CodeGen/MachineRegisterInfo.cpp index 863da72774..82e123528a 100644 --- a/lib/CodeGen/MachineRegisterInfo.cpp +++ b/lib/CodeGen/MachineRegisterInfo.cpp @@ -162,6 +162,8 @@ void MachineRegisterInfo::replaceRegWith(unsigned FromReg, unsigned ToReg) { MachineInstr *MachineRegisterInfo::getVRegDef(unsigned Reg) const { // Since we are in SSA form, we can use the first definition. def_iterator I = def_begin(Reg); + assert((I.atEnd() || llvm::next(I) == def_end()) && + "getVRegDef assumes a single definition or no definition"); return !I.atEnd() ? &*I : 0; } |