On Tue, Mar 8, 2022 at 4:31 PM Erick Ochoa via Gcc <gcc@gcc.gnu.org> wrote: > > Hi Martin! > > Thanks for replying, turns out that while I was trying to reply to you I > was able to get the answer. Turns out there is indeed one tree node which > is shared across the two functions. And that is > > TREE_OPERAND (MEM_REF, 1). > > When I was assigning to > > TREE_TYPE ( TREE_OPERAND (MEM_REF, 1) ) in one function, I was modifying > the other. The solution was to create a new tree and assign it directly to > TREE_OPERAND (MEM_REF, 1) in both functions.
Yes, that's because TREE_OPERAND (MEM_REF, 1) is an INTEGER_CST and we share those. See tree_node_can_be_shared in the sharing verifier. Note sharing also includes trees like &a.b.c[1].d for example. The general rule of thumb is to never directly modify trees but call unshare_expr () on them when you do. Richard. > > Thanks!
