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When calling functions passing structures by value, the following behavior has been observed:

If the size of the structure is less than 16 bytes, then c2mir generates functions which return 2 values of 8 bytes to avoid allocating a block of memory on the stack.

If the size of the structure is greater than 16 bytes, c2mir allocates a memory block on the stack in which the values of the structure are written.

Until this problem is fixed, C source code should be modified so that structures are always larger than 16 bytes (ugly)