[llvm-commits] CVS: llvm/lib/Transforms/Scalar/TailDuplication.cpp

[Chris Lattner]

Changes in directory llvm/lib/Transforms/Scalar:

TailDuplication.cpp updated: 1.4 -> 1.5

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Log message:

Fix bug: TailDup/2003-07-22-InfiniteLoop.ll


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Diffs of the changes:

Index: llvm/lib/Transforms/Scalar/TailDuplication.cpp
diff -u llvm/lib/Transforms/Scalar/TailDuplication.cpp:1.4 llvm/lib/Transforms/Scalar/TailDuplication.cpp:1.5
--- llvm/lib/Transforms/Scalar/TailDuplication.cpp:1.4	Tue Jun 24 14:48:06 2003
+++ llvm/lib/Transforms/Scalar/TailDuplication.cpp	Tue Jul 22 22:32:41 2003
@@ -76,6 +76,11 @@
   BasicBlock *Dest = BI->getSuccessor(0);
   if (Dest == BI->getParent()) return false;        // Do not loop infinitely!
 
+  // Do not inline a block if we will just get another branch to the same block!
+  if (BranchInst *DBI = dyn_cast<BranchInst>(Dest->getTerminator()))
+    if (DBI->isUnconditional() && DBI->getSuccessor(0) == Dest)
+      return false;                                 // Do not loop infinitely!
+
   // Do not bother working on dead blocks...
   pred_iterator PI = pred_begin(Dest), PE = pred_end(Dest);
   if (PI == PE && Dest != Dest->getParent()->begin())