diff options
Diffstat (limited to 'lib/Analysis/InstructionSimplify.cpp')
| -rw-r--r-- | lib/Analysis/InstructionSimplify.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/Analysis/InstructionSimplify.cpp b/lib/Analysis/InstructionSimplify.cpp index f8d159dc43..72e33d1862 100644 --- a/lib/Analysis/InstructionSimplify.cpp +++ b/lib/Analysis/InstructionSimplify.cpp @@ -95,6 +95,12 @@ static bool ValueDominatesPHI(Value *V, PHINode *P, const DominatorTree *DT) { // Arguments and constants dominate all instructions. return true; + // If we are processing instructions (and/or basic blocks) that have not been + // fully added to a function, the parent nodes may still be null. Simply + // return the conservative answer in these cases. + if (!I->getParent() || !P->getParent() || !I->getParent()->getParent()) + return false; + // If we have a DominatorTree then do a precise test. if (DT) { if (!DT->isReachableFromEntry(P->getParent())) |