[llvm-commits] [llvm] r42120 - /llvm/trunk/lib/Transforms/Scalar/LoopIndexSplit.cpp

[Devang Patel]

Author: dpatel
Date: Tue Sep 18 19:11:01 2007
New Revision: 42120

URL: http://llvm.org/viewvc/llvm-project?rev=42120&view=rev
Log:
Bail out early, before modifying anything.

Modified:
    llvm/trunk/lib/Transforms/Scalar/LoopIndexSplit.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/LoopIndexSplit.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/LoopIndexSplit.cpp?rev=42120&r1=42119&r2=42120&view=diff

==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/LoopIndexSplit.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/LoopIndexSplit.cpp Tue Sep 18 19:11:01 2007
@@ -542,6 +542,11 @@
   if (!safeSplitCondition(SD))
     return false;
 
+  BasicBlock *Latch = L->getLoopLatch();
+  BranchInst *BR = dyn_cast<BranchInst>(Latch->getTerminator());
+  if (!BR)
+    return false;
+
   // Update CFG.
 
   // Replace index variable with split value in loop body. Loop body is executed
@@ -549,11 +554,7 @@
   IndVar->replaceAllUsesWith(SD.SplitValue);
 
   // Remove Latch to Header edge.
-  BasicBlock *Latch = L->getLoopLatch();
   BasicBlock *LatchSucc = NULL;
-  BranchInst *BR = dyn_cast<BranchInst>(Latch->getTerminator());
-  if (!BR)
-    return false;
   Header->removePredecessor(Latch);
   for (succ_iterator SI = succ_begin(Latch), E = succ_end(Latch);
        SI != E; ++SI) {