gcc/testsuite/gcc.target/aarch64/aapcs64/va_arg-6.c

/* Test AAPCS64 layout and __builtin_va_arg.

   This test is focus on certain unnamed homogeneous floating-point aggregate
   types passed in fp/simd registers.  */

/* { dg-do run { target aarch64*-*-* } } */

#ifndef IN_FRAMEWORK
#define AAPCS64_TEST_STDARG
#define TESTFILE "va_arg-6.c"
#include "type-def.h"

struct hfa_fx1_t hfa_fx1 = {12.345f};
struct hfa_dx2_t hfa_dx2 = {234.567, 345.678};
struct hfa_ffs_t hfa_ffs;
union hfa_union_t hfa_union;

#define HAS_DATA_INIT_FUNC
void init_data ()
{
  hfa_union.s.a = 37.f;
  hfa_union.s.b = 38.f;
  hfa_union.c   = 39.f;

  hfa_ffs.a = 42.f;
  hfa_ffs.b = 43.f;
  hfa_ffs.c.a = 44.f;
  hfa_ffs.c.b = 45.f;
}

#include "abitest.h"
#else
  ARG      (int, 1, W0, LAST_NAMED_ARG_ID)
  DOTS
  ANON     (struct hfa_ffs_t  , hfa_ffs  , S0     , 0)
  ANON     (union  hfa_union_t, hfa_union, S4     , 1)
  ANON     (struct hfa_dx2_t  , hfa_dx2  , D6     , 2)
  ANON     (struct hfa_fx1_t  , hfa_fx1  , STACK  , 3)
  LAST_ANON(double            , 1.0      , STACK+8, 4)
#endif