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Since we're not checking for the more general AllocationInst first, we need to explicitly check
that Object is an Argument before casting it to one. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47268 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -272,7 +272,7 @@ BasicAliasAnalysis::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
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// If this is a tail call and P points to a stack location, we know that
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// the tail call cannot access or modify the local stack.
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if (isa<AllocaInst>(Object) ||
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cast<Argument>(Object)->hasByValAttr())
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(isa<Argument>(Object) && cast<Argument>(Object)->hasByValAttr()))
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if (CallInst *CI = dyn_cast<CallInst>(CS.getInstruction()))
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if (CI->isTailCall())
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return NoModRef;
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