kit

kit
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agg_ret_sret.c (637B)

      1 /* A struct LARGER than 16 bytes (five ints, 20 bytes) returned by value, which
      2  * forces the sret (struct-return via hidden pointer in x8) calling convention:
      3  * the caller allocates the result slot and passes its address in x8, the callee
      4  * stores fields through x8. Exercises the sret lowering on both sides. Sum of
      5  * 4+8+10+12+8 = 42. */
      6 struct Five {
      7   int a, b, c, d, e;
      8 };
      9 __attribute__((noinline)) static struct Five mk5(int base) {
     10   struct Five s = {base, base * 2, base * 2 + 2, base * 3, base * 2};
     11   return s;
     12 }
     13 int test_main(void) {
     14   volatile int x = 4;
     15   struct Five s = mk5(x);
     16   return s.a + s.b + s.c + s.d + s.e;
     17 }