diff options
| -rw-r--r-- | include/llvm/CodeGen/LiveVariables.h | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/include/llvm/CodeGen/LiveVariables.h b/include/llvm/CodeGen/LiveVariables.h index 866b981b39..b3911ec80b 100644 --- a/include/llvm/CodeGen/LiveVariables.h +++ b/include/llvm/CodeGen/LiveVariables.h @@ -127,8 +127,9 @@ public: /// KillsRegister - Return true if the specified instruction kills the /// specified register. - bool KillsRegister(MachineInstr *MI, unsigned Reg) { - std::pair<killed_iterator, killed_iterator> KIP = killed_range(MI); + bool KillsRegister(MachineInstr *MI, unsigned Reg) const { + typedef std::multimap<MachineInstr*, unsigned>::const_iterator cki; + std::pair<cki, cki> KIP = RegistersKilled.equal_range(MI); for (; KIP.first != KIP.second; ++KIP.first) if (KIP.first->second == Reg) return true; @@ -145,6 +146,17 @@ public: dead_range(MachineInstr *MI) { return RegistersDead.equal_range(MI); } + + /// RegisterDefIsDead - Return true if the specified instruction defines the + /// specified register, but that definition is dead. + bool RegisterDefIsDead(MachineInstr *MI, unsigned Reg) const { + typedef std::multimap<MachineInstr*, unsigned>::const_iterator cki; + std::pair<cki, cki> KIP = RegistersDead.equal_range(MI); + for (; KIP.first != KIP.second; ++KIP.first) + if (KIP.first->second == Reg) + return true; + return false; + } //===--------------------------------------------------------------------===// // API to update live variable information |