diff options
| -rw-r--r-- | include/llvm/CodeGen/MachineRegisterInfo.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/llvm/CodeGen/MachineRegisterInfo.h b/include/llvm/CodeGen/MachineRegisterInfo.h index 1c2baef8bc..061d60a23e 100644 --- a/include/llvm/CodeGen/MachineRegisterInfo.h +++ b/include/llvm/CodeGen/MachineRegisterInfo.h @@ -172,6 +172,15 @@ public: /// specified register (it may be live-in). bool def_empty(unsigned RegNo) const { return def_begin(RegNo) == def_end(); } + /// hasOneDef - Return true if there is exactly one instruction defining the + /// specified register. + bool hasOneDef(unsigned RegNo) const { + def_iterator DI = def_begin(RegNo); + if (DI == def_end()) + return false; + return ++DI == def_end(); + } + /// use_iterator/use_begin/use_end - Walk all uses of the specified register. typedef defusechain_iterator<true,false,false> use_iterator; use_iterator use_begin(unsigned RegNo) const { |