kit

kit
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agg_byval.c (569B)

      1 /* A small struct (two ints, 8 bytes) passed BY VALUE. On the AArch64 PCS a
      2  * struct <= 16 bytes is passed in integer registers (here packed into one x
      3  * register), so this exercises the caller packing the fields and the callee
      4  * unpacking them. `noinline` forces a real call so the byval lowering is
      5  * actually emitted. sum.a + sum.b = 20 + 22 = 42. */
      6 struct Pair {
      7   int a;
      8   int b;
      9 };
     10 __attribute__((noinline)) static int sum(struct Pair p) { return p.a + p.b; }
     11 int test_main(void) {
     12   volatile int x = 20, y = 22;
     13   struct Pair p = {x, y};
     14   return sum(p);
     15 }