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Cut off crazy computation. This helps PR1622 slightly.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41522 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-08-28 04:23:55 +00:00
parent 1cd39a4f6e
commit 92103de8ce
1 changed files with 4 additions and 0 deletions
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4
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -8284,6 +8284,10 @@ static bool DeadPHICycle(PHINode *PN,
if (!PotentiallyDeadPHIs.insert(PN)) if (!PotentiallyDeadPHIs.insert(PN))
return true; return true;
// Don't scan crazily complex things.
if (PotentiallyDeadPHIs.size() == 16)
return false;
if (PHINode *PU = dyn_cast<PHINode>(PN->use_back())) if (PHINode *PU = dyn_cast<PHINode>(PN->use_back()))
return DeadPHICycle(PU, PotentiallyDeadPHIs); return DeadPHICycle(PU, PotentiallyDeadPHIs);