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Cut off crazy computation. This helps PR1622 slightly.

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llvm-svn: 41522
This commit is contained in:
Chris Lattner 2007-08-28 04:23:55 +00:00
parent c649f24384
commit 73aa3d62dc
1 changed files with 4 additions and 0 deletions
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4
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -8283,6 +8283,10 @@ static bool DeadPHICycle(PHINode *PN,
// 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);