[llvm-commits] CVS: llvm/lib/Analysis/LoopInfo.cpp

[Chris Lattner]

Changes in directory llvm/lib/Analysis:

LoopInfo.cpp updated: 1.31 -> 1.32

---
Log message:

Fix bug: LICM/2003-02-27-PreheaderProblem.ll
There may be a single outside predecessor and 
still need a new loop-preheader if the predecessor has multiple 
successors.


---
Diffs of the changes:

Index: llvm/lib/Analysis/LoopInfo.cpp
diff -u llvm/lib/Analysis/LoopInfo.cpp:1.31 llvm/lib/Analysis/LoopInfo.cpp:1.32
--- llvm/lib/Analysis/LoopInfo.cpp:1.31	Wed Feb 26 18:38:34 2003
+++ llvm/lib/Analysis/LoopInfo.cpp	Thu Feb 27 15:51:38 2003
@@ -200,6 +200,13 @@
         return 0;             // Multiple predecessors outside the loop
       Out = *PI;
     }
+  
+  // Make sure there is only one exit out of the preheader...
+  succ_iterator SI = succ_begin(Out);
+  ++SI;
+  if (SI != succ_end(Out))
+    return 0;  // Multiple exits from the block, must not be a preheader.
+
 
   // If there is exactly one preheader, return it.  If there was zero, then Out
   // is still null.