commit 92103de8ce59f37dfab6607ef066d3875f9146ee
author Chris Lattner <sabre@nondot.org> Tue Aug 28 04:23:55 2007 +0000
committer Chris Lattner <sabre@nondot.org> Tue Aug 28 04:23:55 2007 +0000
tree 1e184ba185e621fc27a04470dc373b66de02f478
parent 1cd39a4f6e9d7be7de395e5895ea48b3de6a1792

Cut off crazy computation.  This helps PR1622 slightly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41522 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/InstructionCombining.cpp

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 416e1f0..218da97 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -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);