[llvm-commits] [llvm] r41522 - /llvm/trunk/lib/Transforms/Scalar/InstructionCombining.cpp

[Chris Lattner]

Author: lattner
Date: Mon Aug 27 23:23:55 2007
New Revision: 41522

URL: http://llvm.org/viewvc/llvm-project?rev=41522&view=rev
Log:
Cut off crazy computation.  This helps PR1622 slightly.

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

Modified: llvm/trunk/lib/Transforms/Scalar/InstructionCombining.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/InstructionCombining.cpp?rev=41522&r1=41521&r2=41522&view=diff

==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/InstructionCombining.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/InstructionCombining.cpp Mon Aug 27 23:23:55 2007
@@ -8283,6 +8283,10 @@
   // Remember this node, and if we find the cycle, return.
   if (!PotentiallyDeadPHIs.insert(PN))
     return true;
+  
+  // Don't scan crazily complex things.
+  if (PotentiallyDeadPHIs.size() == 16)
+    return false;
 
   if (PHINode *PU = dyn_cast<PHINode>(PN->use_back()))
     return DeadPHICycle(PU, PotentiallyDeadPHIs);