[llvm-commits] [llvm] r127561 - /llvm/trunk/lib/CodeGen/LiveIntervalUnion.h

[Jakob Stoklund Olesen]

Author: stoklund
Date: Sat Mar 12 19:29:32 2011
New Revision: 127561

URL: http://llvm.org/viewvc/llvm-project?rev=127561&view=rev
Log:
Now that we are deleting unused live intervals during allocation, pointers may be reused.

Use the virtual register number as a cache tag instead. They are not reused.

Modified:
    llvm/trunk/lib/CodeGen/LiveIntervalUnion.h

Modified: llvm/trunk/lib/CodeGen/LiveIntervalUnion.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LiveIntervalUnion.h?rev=127561&r1=127560&r2=127561&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/LiveIntervalUnion.h (original)
+++ llvm/trunk/lib/CodeGen/LiveIntervalUnion.h Sat Mar 12 19:29:32 2011
@@ -163,7 +163,7 @@
     bool CheckedFirstInterference;
     bool SeenAllInterferences;
     bool SeenUnspillableVReg;
-    unsigned Tag;
+    unsigned Tag, VTag;
 
   public:
     Query(): LiveUnion(), VirtReg() {}
@@ -181,11 +181,12 @@
       SeenAllInterferences = false;
       SeenUnspillableVReg = false;
       Tag = 0;
+      VTag = 0;
     }
 
     void init(LiveInterval *VReg, LiveIntervalUnion *LIU) {
       assert(VReg && LIU && "Invalid arguments");
-      if (VirtReg == VReg && LiveUnion == LIU && !LIU->changedSince(Tag)) {
+      if (VReg->reg == VTag && LiveUnion == LIU && !LIU->changedSince(Tag)) {
         // Retain cached results, e.g. firstInterference.
         return;
       }
@@ -193,6 +194,7 @@
       LiveUnion = LIU;
       VirtReg = VReg;
       Tag = LIU->getTag();
+      VTag = VReg->reg;
     }
 
     LiveInterval &virtReg() const {