diff options
Diffstat (limited to 'lib/VMCore/Dominators.cpp')
-rw-r--r-- | lib/VMCore/Dominators.cpp | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/lib/VMCore/Dominators.cpp b/lib/VMCore/Dominators.cpp index af51a05c8b..6f97774fc6 100644 --- a/lib/VMCore/Dominators.cpp +++ b/lib/VMCore/Dominators.cpp @@ -88,8 +88,13 @@ bool DominatorTree::dominates(const Instruction *Def, const BasicBlock *UseBB = User->getParent(); const BasicBlock *DefBB = Def->getParent(); - assert(isReachableFromEntry(DefBB) && isReachableFromEntry(UseBB) && - "We only handle reachable blocks"); + // Any unreachable use is dominated, even if Def == User. + if (!isReachableFromEntry(UseBB)) + return true; + + // Unreachable definitions don't dominate anything. + if (!isReachableFromEntry(DefBB)) + return false; // An instruction doesn't dominate a use in itself. if (Def == User) @@ -119,8 +124,13 @@ bool DominatorTree::dominates(const Instruction *Def, const BasicBlock *UseBB) const { const BasicBlock *DefBB = Def->getParent(); - assert(isReachableFromEntry(DefBB) && isReachableFromEntry(UseBB) && - "We only handle reachable blocks"); + // Any unreachable use is dominated, even if DefBB == UseBB. + if (!isReachableFromEntry(UseBB)) + return true; + + // Unreachable definitions don't dominate anything. + if (!isReachableFromEntry(DefBB)) + return false; if (DefBB == UseBB) return false; |