New file

[oota-llvm.git] / include / llvm / CodeGen / LiveVariables.h

diff --git a/include/llvm/CodeGen/LiveVariables.h b/include/llvm/CodeGen/LiveVariables.h
index 7820f7414d4f2db87e59e62bcb07aeefa9d01869..866b981b394d8cead1851f1aeed8491f6dd85821 100644 (file)
--- a/include/llvm/CodeGen/LiveVariables.h
+++ b/include/llvm/CodeGen/LiveVariables.h
@@ -1,12 +1,12 @@
 //===-- llvm/CodeGen/LiveVariables.h - Live Variable Analysis ---*- C++ -*-===//
-// 
+//
 //                     The LLVM Compiler Infrastructure
 //
 // This file was developed by the LLVM research group and is distributed under
 // the University of Illinois Open Source License. See LICENSE.TXT for details.
-// 
+//
 //===----------------------------------------------------------------------===//
-// 
+//
 // This file implements the LiveVariable analysis pass.  For each machine
 // instruction in the function, this pass calculates the set of registers that
 // are immediately dead after the instruction (i.e., the instruction calculates
@@ -23,7 +23,7 @@
 // to resolve physical register lifetimes in each basic block).  If a physical
 // register is not register allocatable, it is not tracked.  This is useful for
 // things like the stack pointer and condition codes.
-//   
+//
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_CODEGEN_LIVEVARIABLES_H
@@ -111,7 +111,7 @@ public:
   /// killed_iterator - Iterate over registers killed by a machine instruction
   ///
   typedef std::multimap<MachineInstr*, unsigned>::iterator killed_iterator;
-  
+
   /// killed_begin/end - Get access to the range of registers killed by a
   /// machine instruction.
   killed_iterator killed_begin(MachineInstr *MI) {
@@ -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);
   }
@@ -233,7 +243,7 @@ public:
 
   void MarkVirtRegAliveInBlock(VarInfo &VRInfo, MachineBasicBlock *BB);
   void HandleVirtRegUse(VarInfo &VRInfo, MachineBasicBlock *MBB,
-                               MachineInstr *MI);
+                        MachineInstr *MI);
 };
 
 } // End llvm namespace