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It's possible that some function can load and store the same variable using the same constant expression: store %Derived* @foo, %Derived** bitcast (%Base** @bar to %Derived**) %42 = load %Derived*, %Derived** bitcast (%Base** @bar to %Derived**) The bitcast expression was mistakenly cached while processing loads, and never examined later when processing store. This caused @bar to be mistakenly treated as read-only variable. See load-store-caching.ll. llvm-svn: 365188
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