[llvm-commits] [llvm] r72970 - /llvm/trunk/lib/Analysis/ScalarEvolution.cpp

[Devang Patel]

Author: dpatel
Date: Fri Jun  5 18:08:56 2009
New Revision: 72970

URL: http://llvm.org/viewvc/llvm-project?rev=72970&view=rev
Log:
Simplify.

Modified:
    llvm/trunk/lib/Analysis/ScalarEvolution.cpp

Modified: llvm/trunk/lib/Analysis/ScalarEvolution.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/ScalarEvolution.cpp?rev=72970&r1=72969&r2=72970&view=diff

==============================================================================
--- llvm/trunk/lib/Analysis/ScalarEvolution.cpp (original)
+++ llvm/trunk/lib/Analysis/ScalarEvolution.cpp Fri Jun  5 18:08:56 2009
@@ -2462,24 +2462,15 @@
 ScalarEvolution::BackedgeTakenInfo
 ScalarEvolution::ComputeBackedgeTakenCount(const Loop *L) {
   // If the loop has a non-one exit block count, we can't analyze it.
-  SmallVector<BasicBlock*, 8> ExitBlocks;
-  L->getExitBlocks(ExitBlocks);
-  if (ExitBlocks.size() != 1) return UnknownValue;
+  BasicBlock *ExitBlock = L->getExitBlock();
+  if (!ExitBlock)
+    return UnknownValue;
 
   // Okay, there is one exit block.  Try to find the condition that causes the
   // loop to be exited.
-  BasicBlock *ExitBlock = ExitBlocks[0];
-
-  BasicBlock *ExitingBlock = 0;
-  for (pred_iterator PI = pred_begin(ExitBlock), E = pred_end(ExitBlock);
-       PI != E; ++PI)
-    if (L->contains(*PI)) {
-      if (ExitingBlock == 0)
-        ExitingBlock = *PI;
-      else
-        return UnknownValue;   // More than one block exiting!
-    }
-  assert(ExitingBlock && "No exits from loop, something is broken!");
+  BasicBlock *ExitingBlock = L->getExitingBlock();
+  if (!ExitingBlock)
+    return UnknownValue;   // More than one block exiting!
 
   // Okay, we've computed the exiting block.  See what condition causes us to
   // exit.