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kit
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agg_nested_byval.c (609B)

      1 /* A nested struct (inner struct embedded in outer, 12 bytes total) passed BY
      2  * VALUE. <= 16 bytes so it travels in integer registers per the PCS; the callee
      3  * must extract the nested fields from the packed register operands. Exercises
      4  * nested-field access combined with byval register lowering. 6+15+21 = 42. */
      5 struct Inner {
      6   int x;
      7   int y;
      8 };
      9 struct Outer {
     10   int tag;
     11   struct Inner in;
     12 };
     13 __attribute__((noinline)) static int eval(struct Outer o) {
     14   return o.tag + o.in.x + o.in.y;
     15 }
     16 int test_main(void) {
     17   volatile int a = 6, b = 15, c = 21;
     18   struct Outer o = {a, {b, c}};
     19   return eval(o);
     20 }