libffi/testsuite/libffi.call/return_dbl.c

   1 /* Area:        ffi_call
   2    Purpose:     Check return value double.
   3    Limitations: none.
   4    PR:          none.
   5    Originator:  <andreast@gcc.gnu.org> 20050212  */
   6
   7 /* { dg-do run } */
   8 #include "ffitest.h"
   9
  10 static double return_dbl(double dbl)
  11 {
  12   return 2 * dbl;
  13 }
  14 int main (void)
  15 {
  16   ffi_cif cif;
  17   ffi_type *args[MAX_ARGS];
  18   void *values[MAX_ARGS];
  19   double dbl, rdbl;
  20
  21   args[0] = &ffi_type_double;
  22   values[0] = &dbl;
  23
  24   /* Initialize the cif */
  25   CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 1,
  26                      &ffi_type_double, args) == FFI_OK);
  27
  28   for (dbl = -127.3; dbl <  127; dbl++)
  29     {
  30       ffi_call(&cif, FFI_FN(return_dbl), &rdbl, values);
  31       printf ("%f vs %f\n", rdbl, return_dbl(dbl));
  32       CHECK(rdbl == 2 * dbl);
  33     }
  34   exit(0);
  35 }