Maintain a vaild isTied bit as operands are added and removed.

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

diff --git a/include/llvm/CodeGen/LiveInterval.h b/include/llvm/CodeGen/LiveInterval.h
index b95272273b1355596be42d228fd8a5d42ef3b8b2..a3ce47c02a1a6f52a1aec9f2415283c40ebb278a 100644 (file)
--- a/include/llvm/CodeGen/LiveInterval.h
+++ b/include/llvm/CodeGen/LiveInterval.h
@@ -40,14 +40,6 @@ namespace llvm {
   /// definition and use points.
   ///
   class VNInfo {
-  private:
-    enum {
-      HAS_PHI_KILL    = 1,
-      IS_UNUSED       = 1 << 1
-    };
-
-    unsigned char flags;
-
   public:
     typedef BumpPtrAllocator Allocator;
 
@@ -59,40 +51,19 @@ namespace llvm {
 
     /// VNInfo constructor.
     VNInfo(unsigned i, SlotIndex d)
-      : flags(0), id(i), def(d)
+      : id(i), def(d)
     { }
 
     /// VNInfo construtor, copies values from orig, except for the value number.
     VNInfo(unsigned i, const VNInfo &orig)
-      : flags(orig.flags), id(i), def(orig.def)
+      : id(i), def(orig.def)
     { }
 
     /// Copy from the parameter into this VNInfo.
     void copyFrom(VNInfo &src) {
-      flags = src.flags;
       def = src.def;
     }
 
-    /// Used for copying value number info.
-    unsigned getFlags() const { return flags; }
-    void setFlags(unsigned flags) { this->flags = flags; }
-
-    /// Merge flags from another VNInfo
-    void mergeFlags(const VNInfo *VNI) {
-      flags = (flags | VNI->flags) & ~IS_UNUSED;
-    }
-
-    /// Returns true if one or more kills are PHI nodes.
-    /// Obsolete, do not use!
-    bool hasPHIKill() const { return flags & HAS_PHI_KILL; }
-    /// Set the PHI kill flag on this value.
-    void setHasPHIKill(bool hasKill) {
-      if (hasKill)
-        flags |= HAS_PHI_KILL;
-      else
-        flags &= ~HAS_PHI_KILL;
-    }
-
     /// Returns true if this value is defined by a PHI instruction (or was,
     /// PHI instrucions may have been eliminated).
     /// PHI-defs begin at a block boundary, all other defs begin at register or
@@ -100,14 +71,10 @@ namespace llvm {
     bool isPHIDef() const { return def.isBlock(); }
 
     /// Returns true if this value is unused.
-    bool isUnused() const { return flags & IS_UNUSED; }
-    /// Set the "is unused" flag on this value.
-    void setIsUnused(bool unused) {
-      if (unused)
-        flags |= IS_UNUSED;
-      else
-        flags &= ~IS_UNUSED;
-    }
+    bool isUnused() const { return !def.isValid(); }
+
+    /// Mark this value as unused.
+    void markUnused() { def = SlotIndex(); }
   };
 
   /// LiveRange structure - This represents a simple register range in the