[llvm] r176705 - Avoid creating a SlotIndex from the end() iterator.

[Jakob Stoklund Olesen]

Author: stoklund
Date: Fri Mar  8 12:08:54 2013
New Revision: 176705

URL: http://llvm.org/viewvc/llvm-project?rev=176705&view=rev
Log:
Avoid creating a SlotIndex from the end() iterator.

No test case, spotted by inspection.

Modified:
    llvm/trunk/include/llvm/CodeGen/SlotIndexes.h

Modified: llvm/trunk/include/llvm/CodeGen/SlotIndexes.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/SlotIndexes.h?rev=176705&r1=176704&r2=176705&view=diff
==============================================================================
--- llvm/trunk/include/llvm/CodeGen/SlotIndexes.h (original)
+++ llvm/trunk/include/llvm/CodeGen/SlotIndexes.h Fri Mar  8 12:08:54 2013
@@ -396,12 +396,16 @@ namespace llvm {
       return index.isValid() ? index.listEntry()->getInstr() : 0;
     }
 
-    /// Returns the next non-null index.
-    SlotIndex getNextNonNullIndex(SlotIndex index) {
-      IndexList::iterator itr(index.listEntry());
-      ++itr;
-      while (itr != indexList.end() && itr->getInstr() == 0) { ++itr; }
-      return SlotIndex(itr, index.getSlot());
+    /// Returns the next non-null index, if one exists.
+    /// Otherwise returns getLastIndex().
+    SlotIndex getNextNonNullIndex(SlotIndex Index) {
+      IndexList::iterator I = Index.listEntry();
+      IndexList::iterator E = indexList.end();
+      while (I != E)
+        if ((++I)->getInstr())
+          return SlotIndex(I, Index.getSlot());
+      // We reached the end of the function.
+      return getLastIndex();
     }
 
     /// getIndexBefore - Returns the index of the last indexed instruction