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typedef struct { int c, d, e, f, g; } D; void bar (unsigned long, unsigned long); void foo (D *y) { int x = 0; if (y->f == 0) x |= 0x1; if (y->g == 0) x |= 0x2; bar ((x << 16) | (y->c & 0xffff), (y->d << 16) | (y->e & 0xffff)); }