Add a useful accessor

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19209 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/CodeGen/LiveVariables.h b/include/llvm/CodeGen/LiveVariables.h
index 7820f7414d4f2db87e59e62bcb07aeefa9d01869..17c1e2a7704c2c74994a4c8abc247fd8f62f1a8a 100644 (file)
--- a/include/llvm/CodeGen/LiveVariables.h
+++ b/include/llvm/CodeGen/LiveVariables.h
@@ -125,6 +125,16 @@ public:
     return RegistersKilled.equal_range(MI);
   }
 
+  /// 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);
+    for (; KIP.first != KIP.second; ++KIP.first)
+      if (KIP.first->second == Reg)
+        return true;
+    return false;
+  }
+
   killed_iterator dead_begin(MachineInstr *MI) {
     return RegistersDead.lower_bound(MI);
   }