github.com/prattmic/llgo-embedded@v0.0.0-20150820070356-41cfecea0e1e/third_party/gofrontend/libffi/testsuite/libffi.call/cls_float.c (about)

     1  /* Area:	closure_call
     2     Purpose:	Check return value float.
     3     Limitations:	none.
     4     PR:		none.
     5     Originator:	<andreast@gcc.gnu.org> 20030828	 */
     6  
     7  /* { dg-do run } */
     8  #include "ffitest.h"
     9  
    10  static void cls_ret_float_fn(ffi_cif* cif __UNUSED__, void* resp, void** args,
    11  			     void* userdata __UNUSED__)
    12   {
    13     *(float *)resp = *(float *)args[0];
    14  
    15     printf("%g: %g\n",*(float *)args[0],
    16  	  *(float *)resp);
    17   }
    18  
    19  typedef float (*cls_ret_float)(float);
    20  
    21  int main (void)
    22  {
    23    ffi_cif cif;
    24    void *code;
    25    ffi_closure *pcl = ffi_closure_alloc(sizeof(ffi_closure), &code);
    26    ffi_type * cl_arg_types[2];
    27    float res;
    28  
    29    cl_arg_types[0] = &ffi_type_float;
    30    cl_arg_types[1] = NULL;
    31  
    32    /* Initialize the cif */
    33    CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 1,
    34  		     &ffi_type_float, cl_arg_types) == FFI_OK);
    35  
    36    CHECK(ffi_prep_closure_loc(pcl, &cif, cls_ret_float_fn, NULL, code)  == FFI_OK);
    37    res = ((((cls_ret_float)code)(-2122.12)));
    38    /* { dg-output "\\-2122.12: \\-2122.12" } */
    39    printf("res: %.6f\n", res);
    40    /* { dg-output "\nres: \-2122.120117" } */
    41    exit(0);
    42  }