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Programmers’ manual says we can iterate over a use-def chain by op_iterator. It works fine except for load and store instruction of stack variables. For example, a simple bitcode is like the below. i = alloca i32 store i32 0, i32* %i, align 4 %tmp1 = load i32* %i, align 4 If I apply a use-def chain to load instruction, I get alloca instruction. I think store instruction is a correct