[llvm-commits] CVS: llvm/lib/VMCore/BasicBlock.cpp

[Chris Lattner]

Changes in directory llvm/lib/VMCore:

BasicBlock.cpp updated: 1.30 -> 1.31

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Log message:

Fix a bug that occurred when removing the last predecessor INTO an 
infinite loop


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Diffs of the changes:

Index: llvm/lib/VMCore/BasicBlock.cpp
diff -u llvm/lib/VMCore/BasicBlock.cpp:1.30 llvm/lib/VMCore/BasicBlock.cpp:1.31
--- llvm/lib/VMCore/BasicBlock.cpp:1.30	Wed Apr 23 11:37:45 2003
+++ llvm/lib/VMCore/BasicBlock.cpp	Fri Apr 25 18:14:19 2003
@@ -186,7 +186,11 @@
 
       // If the PHI _HAD_ two uses, replace PHI node with its now *single* value
       if (max_idx == 2) {
-	PN->replaceAllUsesWith(PN->getOperand(0));
+        if (PN->getOperand(0) != PN)
+          PN->replaceAllUsesWith(PN->getOperand(0));
+        else
+          // We are left with an infinite loop with no entries: kill the PHI.
+          PN->replaceAllUsesWith(Constant::getNullValue(PN->getType()));
         getInstList().pop_front();    // Remove the PHI node
       }