From 20647a55bfabd715bfef52f68d6d13753a672940 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Tue, 23 Aug 2005 22:43:24 +0000
Subject: [PATCH] Add RegisterDefIsDead to correspond to KillsRegister, mark
 both const

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22987 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/LiveVariables.h | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/include/llvm/CodeGen/LiveVariables.h b/include/llvm/CodeGen/LiveVariables.h
index 866b981b394..b3911ec80b3 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