diff options
Diffstat (limited to 'llvm/lib/Transforms/InstCombine/InstructionCombining.cpp')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstructionCombining.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp index ff063f9..5d2d79e 100644 --- a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp +++ b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp @@ -5212,7 +5212,7 @@ Instruction *InstCombinerImpl::visitFreeze(FreezeInst &I) { else if (match(U, m_Select(m_Specific(&I), m_Constant(), m_Value()))) V = ConstantInt::getTrue(Ty); else if (match(U, m_c_Select(m_Specific(&I), m_Value(V)))) { - if (!isGuaranteedNotToBeUndefOrPoison(V, &AC, &I, &DT)) + if (V == &I || !isGuaranteedNotToBeUndefOrPoison(V, &AC, &I, &DT)) V = NullValue; } else if (auto *PHI = dyn_cast<PHINode>(U)) { if (Value *MaybeV = pickCommonConstantFromPHI(*PHI)) @@ -5225,6 +5225,7 @@ Instruction *InstCombinerImpl::visitFreeze(FreezeInst &I) { BestValue = NullValue; } assert(BestValue && "Must have at least one use"); + assert(BestValue != &I && "Cannot replace with itself"); return BestValue; }; |